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Overview

These pages (work in progress) offer a collection of chess opening lines selected using two competing criteria: the opening line must be seen in human Master play and the expected outcome must be biased towards one side. Popularity in human master play was estimated using total entries in three databases: ChessBase Big Database, Caissabase and ICCF Opening Master Database. Bias was obtained from the evaluated openings Chess Cloud Database (also known as dbcn). The collection was assembled by Bas Braams with motivation from the Top Chess Engine Competition (TCEC).

Notation

In most places on sub-pages of this main page an opening line carries an annotation of the form (<a>cp, <b>cp; <c>/M, <d>%). The entries have the following meaning.
<a>: Evaluation of the position according to dbcn and expressed in centipawns (cp), from the perspective of the side to move.
<b>: Value in centipawns of the final move of the opening line, relative to the best available move, according to dbcn.
<c>: Popularity of the position in occurences per million games (expressed as 1/M) in the database underlying these pages.
<d>: Ratio of popularity after the final move to popularity of the position before the final move.
Please note that the dbcn scores vary over time as the database evolves. Data on these pages are lagging behind the dbcn source. For each line links are given to the relevant entry in dbcn and also that in the chess.com Opening Explorer database (here denoted as ccoe). However, one needs a chess.com subscription in order to access those ccoe pages for all except the shortest lines.

This is not an opening book

This document is meant as a resource for an opening book, but it is not itself an opening book. The collection is not balanced; for example, it contains many biased lines in the Dutch Defense and not so many in the main line Ruy López Opening. The collection contains lines with a wide range of bias, much wider than one would want for an opening book for one event, and also lines with a wide range of popularity. Some lines may have a rather boring PV even if the outcome is uncertain, for example due to a quick trade of major pieces.
An actual opening book will have to be assembled with more attention for balance between different categories of openings, more attention for the desired range of bias (which depends on the event) and for the desired level of familiarity in human games, attention for interesting development of the PV, avoidance of near duplicates, and other criteria. Lines that are selected as candidates for an opening book may be inspected more closely for suitability. So, just to be clear again, this document is not an opening book.

Special pages

Transpositions are handled as described in the linked page. For any position in this collection only one canonical line is provided.
Here are selected Short popular lines on the edge (estimated) between draw and win; bias in the vicinity of 100cp.
The most popular and at least moderately biased lines are reviewed under that link. The following sections provide many more lines that are in general less popular (but not unheard of) and more biased.
Selected Lines with advantage for black are provided in the linked page. (They are also in the main pages.)
Here are selected Lines with strong disagreement between popularity in human master play and dbcn eval for the closing move of the line.

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6: Sicilian Defense: Open, Najdorf Variation

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5: Sicilian Defense: Open, Najdorf, English Attack, 6...e5
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. f3: (T) Sicilian Defense: Open, Scheveningen, English Attack with 7.f3
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6: (T) Sicilian Defense: Open, Scheveningen Variation, 6.Be3 a6, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3: Sicilian Defense: Open, Najdorf, English Attack, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7: Sicilian Defense: Open, Najdorf, Traditional Line
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7: Sicilian Defense: Open, Najdorf Variation, 6.Bg5 e6 7.f4 Be7, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6: Sicilian Defense: Open, Najdorf, Poisoned Pawn Variation
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5: Sicilian Defense: Open, Najdorf Variation, 6.Bg5, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2: Sicilian Defense: Open, Najdorf, Opočenský Variation
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4: Sicilian Defense: Open, Najdorf, Lipnitsky Attack
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3: Sicilian Defense: Open, Najdorf, Adams' Attack
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f3: Sicilian Defense: Open, Najdorf, 6.f3
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4: Sicilian Defense: Open, Najdorf, Amsterdam Variation
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g3: Sicilian Defense: Open, Najdorf, Zagreb Variation
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6: Sicilian Defense: Open, Najdorf Variation, Other Continuations

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4: Sicilian Defense: Open Variation, Other Continuations

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6: Sicilian Defense: Open, Classical, Richter-Rauzer Variation, 6...e6 7.Qd2 a6
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5: Sicilian Defense: Open, Classical, Richter-Rauzer Variation, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4: Sicilian Defense: Open, Classical, Sozin Attack
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6: Sicilian Defense: Open, Classical Variation, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 Bd7 10. O-O-O Rc8: Sicilian Defense: Open, Dragon, Old Line
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4: Sicilian Defense: Open, Dragon, Main Line
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. O-O-O: Sicilian Defense: Open, Dragon, Rauzer Variation
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O: Sicilian Defense: Open, Dragon, Yugoslav Attack, 7...O-O, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6: Sicilian Defense: Open, Dragon, Belezky Line
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3: Sicilian Defense: Open, Dragon, Yugoslav Attack, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2: Sicilian Defense: Open, Dragon, Classical Attack
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6: Sicilian Defense: Open, Dragon Variation, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2: Sicilian Defense: Open, Scheveningen, Classical Variation
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g4: Sicilian Defense: Open, Scheveningen, Keres Attack
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6: Sicilian Defense: Open, Scheveningen Variation, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4: Sicilian Defense: Open Variation, Other Continuations

1. e4 c5 2. Nf3 d6: Sicilian Defense: 2.Nf3 d6, Other Continuations

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4: Sicilian Defense: Chekhover Variation
1. e4 c5 2. Nf3 d6 3. d4: Sicilian Defense: 2.Nf3 d6 3.d4, Other Continuations
1. e4 c5 2. Nf3 d6 3. Bb5+: Sicilian Defense: Canal Attack
1. e4 c5 2. Nf3 d6 3. c3: Sicilian Defense: Delayed Alapin Variation
1. e4 c5 2. Nf3 d6: Sicilian Defense: 2.Nf3 d6, Other Continuations

1. e4 c5 2. Nf3 Nc6 3. d4: Sicilian Defense: Old Sicilian, Open

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5: Sicilian Defense: Open, Sveshnikov, Chelyabinsk Variation
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5: Sicilian Defense: Open, Sveshnikov Variation, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5: Sicilian Defense: Open, Lasker-Pelikán Variation, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6: Sicilian Defense: Four Knights Variation
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6: Sicilian Defense: Open, 3...cxd4 4.Nxd4 Nf6, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Qc7 6. Be3: Sicilian Defense: Taimanov, Bastrikov Variation, 6.Be3
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Qc7 6. Be2: Sicilian Defense: Taimanov, Bastrikov Variation, 6.Be2
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Qc7: Sicilian Defense: Taimanov, Bastrikov Variation, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6: Sicilian Defense: Taimanov Variation, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3: Sicilian Defense: Open, Accelerated Dragon, Modern Variation
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 O-O: Sicilian Defense: Open, Accelerated Dragon, Maróczy Bind Formation, 5...Bg7 etc.
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7: Sicilian Defense: Open, Accelerated Dragon, Maróczy Bind Formation, 5...Bg7, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4: Sicilian Defense: Open, Accelerated Dragon, Maróczy Bind Formation, 5...Nf6 and Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6: Sicilian Defense: Old Sicilian, Open, Accelerated Dragon Variation, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5: Sicilian Defense: Open, Löwenthal Variation
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qb6: Sicilian Defense: Open, Godiva Variation
1. e4 c5 2. Nf3 Nc6 3. d4: Sicilian Defense: Open, Other Continuations

1. e4 c5 2. Nf3 Nc6: Sicilian Defense: Old Sicilian Variation, Other Continuations

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6: Sicilian Defense: Nyezhmetdinov-Rossolimo, Fianchetto Variation
1. e4 c5 2. Nf3 Nc6 3. Bb5 d6: (T) Sicilian Defense: Canal Attack, 3...Nc6
1. e4 c5 2. Nf3 Nc6 3. Bb5 e6: Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, 3...e6
1. e4 c5 2. Nf3 Nc6 3. Bb5: Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Other Continuations
1. e4 c5 2. Nf3 Nc6 3. Nc3: (T) Sicilian Defense: Closed, Traditional Line, 3.Nf3
1. e4 c5 2. Nf3 Nc6: Sicilian Defense: Old Sicilian Variation, Other Continuations

1. e4 c5 2. Nf3 e6: Sicilian Defense: French Variation

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7: Sicilian Defense: Kan, Knight Variation, 5...Qc7
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3: Sicilian Defense: Kan, Knight Variation, Wing Attack (5...b5) and Other Continuations
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Nf6: Sicilian Defense: Kan, Modern Variation, 5...Nf6
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5: Sicilian Defense: Kan, Modern, Polugaevsky Variation
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3: Sicilian Defense: Kan, Modern Variation, Other Continuations
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4: Sicilian Defense: Kan, Maróczy Bind Formation
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6: Sicilian Defense: Kan Variation, Other Continuations
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6: Sicilian Defense: Normal Line
1. e4 c5 2. Nf3 e6 3. d4: Sicilian Defense: French Variation, 3.d4, Other Continuations
1. e4 c5 2. Nf3 e6 3. Nc3: Sicilian Defense: Pin Variation
1. e4 c5 2. Nf3 e6 3. c3: (T) Sicilian Defense: Alapin Variation, 2...e6 3.Nf3
1. e4 c5 2. Nf3 e6 3. d3: Sicilian Defense: French Variation, 3.d3
1. e4 c5 2. Nf3 e6: Sicilian Defense: French Variation, Other Continuations

1. e4 c5: Sicilian Defense: Other Continuations

1. e4 c5 2. Nf3 g6: Sicilian Defense: Hyperaccelerated Dragon Variation
1. e4 c5 2. Nf3 a6: Sicilian Defense: O'Kelly Variation
1. e4 c5 2. Nf3: Sicilian Defense: 2.Nf3, Nimzowitsch Variation (2...Nf6) and Other Continuations
1. e4 c5 2. Nc3 Nc6 3. g3: Sicilian Defense: Closed, Fianchetto Variation
1. e4 c5 2. Nc3 Nc6 3. f4: Sicilian Defense: Closed, Grand Prix Attack
1. e4 c5 2. Nc3 Nc6: Sicilian Defense: Closed, Traditional Line, Other Continuations
1. e4 c5 2. Nc3: Sicilian Defense: Closed, Other Continuations
1. e4 c5 2. c3 d5: Sicilian Defense: Alapin Variation, 2...d5
1. e4 c5 2. c3 Nf6: Sicilian Defense: Alapin Variation, 2...Nf6
1. e4 c5 2. c3: Sicilian Defense: Alapin Variation, Other Continuations
1. e4 c5 2. d4 cxd4 3. c3 dxc3: Sicilian Defense: Smith-Morra Gambit Accepted
1. e4 c5 2. d4: Sicilian Defense: Smith-Morra Gambit, Other Continuations
1. e4 c5 2. f4: Sicilian Defense: McDonnell Attack
1. e4 c5: Sicilian Defense: Other Continuations

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6: Ruy López Opening: Morphy Defense

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5: Ruy López Opening: Morphy Defense, Keres Variation, 9...Na5
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8: Ruy López Opening: Morphy Defense, Breyer Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Bb7: Ruy López Opening: Morphy Defense, Flohr-Zaitsev System
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6: Ruy López Opening: Morphy Defense, Closed, 6.Re1 b5 7.Bb3 d6, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5: Ruy López Opening: Marshall Attack
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O: Ruy López Opening: Morphy Defense, Closed, 6.Re1 b5 7.Bb3 O-O, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7: Ruy López Opening: Morphy Defense, Closed, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5: Ruy López Opening: Morphy Defense, Columbus Variation, 4...Nf6 5.O-O b5
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4: Ruy López Opening: Morphy Defense, Open
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6: Ruy López Opening: Morphy Defense, Columbus Variation, 4...Nf6, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6: Ruy López Opening: Morphy Defense, Modern Steinitz Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4: Ruy López Opening: Morphy Defense, Columbus Variation, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6: Ruy López Opening: Morphy Defense, Exchange Variation (4.Bxc6) and Other Continuations

1. e4 e5 2. Nf3 Nc6 3. Bb5: Ruy López Opening, Other Continuations

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4: Ruy López Opening: Berlin, Rio Gambit Accepted
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6: Ruy López Opening: Berlin Defense, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 f5: Ruy López Opening: Jaenisch Gambit (Schliemann Defense)
1. e4 e5 2. Nf3 Nc6 3. Bb5 d6: Ruy López Opening: Old Steinitz Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5: Ruy López Opening: Classical Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7: Ruy López Opening: Cozio Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 g6: Ruy López Opening: Fianchetto Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4: Ruy López Opening: Bird's Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5: Ruy López Opening: Other Continuations

1. e4 e5 2. Nf3 Nc6 3. Bc4: Italian Game

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3: Giuoco Piano Game: Main Line, Giuoco Pianissimo Variation
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4: Giuoco Piano Game: Main Line, Center Attack
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6: Giuoco Piano Game: Main Line, 4...Nf6, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5: Giuoco Piano Game: Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3: Italian Game: Two Knights, Modern Bishop's Opening
1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3: (T) Four Knights Game: Italian Variation
1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5: Italian Game: Knight Attack
1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6: Italian Game: Two Knights Defense, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bc4: Italian Game: Other Continuations

1. e4 e5 2. Nf3 Nc6 3. d4: Scotch Game

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5: Scotch Game: Classical Variation
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3: (T) Four Knights Game: Scotch Variation Accepted, 5.Nxd4
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6: Scotch Game: Schmidt Variation, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4: Scotch Game: 3...exd4 4.Nxd4, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6: Scotch Game: Scotch Gambit, Dubois Réti Defense
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4: Scotch Game: Scotch Gambit, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. d4: Scotch Game: Other Continuations

1. e4 e5 2. Nf3: King's Pawn Opening: King's Knight Variation, Other Continuations

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6: Four Knights Game
1. e4 e5 2. Nf3 Nc6 3. Nc3: Three Knights Opening: Other Continuations
1. e4 e5 2. Nf3 Nc6: King's Pawn Opening: King's Knight Variation, 2...Nc6, Ponziani Opening (3.c3) and Other Continuations
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4: Petrov's Defense: Classical Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5: Petrov's Defense: Classical Variation, Other Continuations
1. e4 e5 2. Nf3 Nf6: Petrov's Defense: Other Continuations
1. e4 e5 2. Nf3 d6 4. d4 exd4: Philidor Defense: Exchange Variation
1. e4 e5 2. Nf3 d6: Philidor Defense: Other Continuations
1. e4 e5 2. Nf3: King's Pawn Opening: King's Knight Variation, Other Continuations

1. e4 e5: King's Pawn Opening: 1...e5, Other Continuations

1. e4 e5 2. Nc3 Nf6 3. Bc4: Vienna Game: Falkbeer, Stanley Variation
1. e4 e5 2. Nc3 Nf6: Vienna Game: Falkbeer Variation, Vienna Gambit (3.f4) and Other Continuations
1. e4 e5 2. Nc3 Nc6: Vienna Game: Max Lange Defense
1. e4 e5 2. Nc3: Vienna Game: Other Continuations
1. e4 e5 2. Bc4: Bishop's Opening
1. e4 e5 2. f4 exf4: King's Gambit Accepted
1. e4 e5 2. f4: King's Gambit: Other Continuations
1. e4 e5: King's Pawn Opening: 1...e5, Other Continuations

1. e4 e6 2. d4 d5 3. Nc3: French Defense: Normal Variation, 2...d5 3.Nc3

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4: French Defense: Winawer, Advance, Poisoned Pawn Variation
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7: French Defense: Winawer, Positional Variation (7.Nf3) and Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7: French Defense: Winawer, Classical Variation
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3: French Defense: Winawer, Advance Variation, 4...c5 5.a3, Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5: French Defense: Winawer, Advance Variation, Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. exd5: French Defense: Winawer, Delayed Exchange Variation
1. e4 e6 2. d4 d5 3. Nc3 Bb4: French Defense: Winawer, Alekhine-Maróczy Gambit (4.Ne2) and Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5: French Defense: Main Line
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7: French Defense: Classical Variation, 4.Bg5 Be7, Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4: French Defense: Classical, Burn Variation
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5: French Defense: Classical, 4.Bg5, MacCutcheon Variation (4...Bb4) and Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3: French Defense: Classical, Steinitz, Boleslavsky Variation
1. e4 e6 2. d4 d5 3. Nc3 Nf6: French Defense: Classical, Other Steinitz Variation (4.e5) and Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7: French Defense: Rubinstein, Blackburne Defense
1. e4 e6 2. d4 d5 3. Nc3 dxe4: French Defense: Rubinstein Variation, Other Continuations
1. e4 e6 2. d4 d5 3. Nc3: French Defense: Normal Variation, 2...d5 3.Nc3, Other Continuations

1. e4 e6 2. d4 d5 3. Nd2: French Defense: Tarrasch Variation

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4: French Defense: Tarrasch, Closed, Main Line
1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2: French Defense: Tarrasch, Closed, 4.e5 etc., Other Continuations
1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3: French Defense: Tarrasch, Closed, 4.e5 Nfd7 5.Bd3, Other Continuations
1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4: French Defense: Tarrasch, Closed, Pawn Center Variation
1. e4 e6 2. d4 d5 3. Nd2 Nf6: French Defense: Tarrasch, Closed, Other Continuations
1. e4 e6 2. d4 d5 3. Nd2 c5: French Defense: Tarrasch, Open
1. e4 e6 2. d4 d5 3. Nd2: French Defense: Tarrasch Variation, Other Continuations

1. e4 e6: French Defense: Other Continuations

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3: French Defense: Advance, Paulsen, Main Line
1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6: French Defense: Advance, Paulsen Attack, 5...Qb6, Other Continuations
1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7: French Defense: Advance, Paulsen Attack, Euwe Variation
1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3: French Defense: Advance, Paulsen Attack, Other Continuations
1. e4 e6 2. d4 d5 3. e5: French Defense: Advance Variation, Other Continuations
1. e4 e6 2. d4 d5 3. exd5: French Defense: Exchange Variation
1. e4 e6 2. d4: French Defense: Normal Variation, Other Continuations
1. e4 e6 2. d3: French Defense: King's Indian Attack
1. e4 e6: French Defense: Other Continuations

1. e4 c6: Caro-Kann Defense

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5: Caro-Kann Defense: Classical, Spassky Variation
1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5: Caro-Kann Defense: Classical Variation, Other Continuations
1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7: Caro-Kann Defense: Karpov Variation
1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4: Caro-Kann Defense: Main Line, 4...Nf6 and Other Continuations
1. e4 c6 2. d4 d5 3. Nc3: Caro-Kann Defense: 2.d4 d5 3.Nc3, Other Continuations
1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3: Caro-Kann Defense: Advance, Short Variation with 4.Nf3
1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3: Caro-Kann Defense: Advance, Van der Wiel Attack
1. e4 c6 2. d4 d5 3. e5 Bf5 4. h4: Caro-Kann Defense: Advance, Tal Variation
1. e4 c6 2. d4 d5 3. e5: Caro-Kann Defense: Advance Variation, Other Continuations
1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4: Caro-Kann Defense: Panov Attack
1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3: Caro-Kann Defense: Exchange Variation, 3...cxd5 4.Bd3
1. e4 c6 2. d4 d5 3. exd5: Caro-Kann Defense: Exchange Variation, Other Continuations
1. e4 c6 2. d4 d5 3. Nd2: Caro-Kann Defense: Modern Variation
1. e4 c6 2. d4 d5 3. f3: Caro-Kann Defense: Fantasy Variation
1. e4 c6 2. d4: Caro-Kann Defense: 2.d4, Other Continuations
1. e4 c6 2. Nc3: Caro-Kann Defense: 2.Nc3
1. e4 c6 2. c4: Caro-Kann Defense: Accelerated Panov Attack
1. e4 c6: Caro-Kann Defense: Other Continuations

1. e4 d6: Pirc Defense

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2: Pirc Defense: Classical, Quiet System
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3: Pirc Defense: Classical, Schlechter Variation
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3: Pirc Defense: Classical Variation, Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. Bd3: Pirc Defense: Main Line, Austrian, Weiss Variation
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O: Pirc Defense: Main Line, Austrian Attack, 4...Bg7 5.Nf3 O-O, Unzicker Attack (6.e5), Kurajica Variation (6.Be3) and Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3: Pirc Defense: Main Line, Austrian, Dragon Formation (5...c5) and Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4: Pirc Defense: Main Line, Austrian Attack, Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3: Pirc Defense: Main Line, 4.Be3
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5: Pirc Defense: Main Line, Byrne Variation
1. e4 d6 2. d4 Nf6 3. Nc3 g6: Pirc Defense: Main Line, Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3: (T) Philidor Defense: Nimzowitsch Variation, 4.Nc3
1. e4 d6 2. d4 Nf6 3. Nc3 e5: Pirc Defense: 2.d4 Nf6 3.Nc3 e5, Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3 c6: Pirc Defense: Czech Defense
1. e4 d6 2. d4 Nf6: Pirc Defense: 2.d4 Nf6, Other Continuations
1. e4 d6 2. d4 g6: (T) Modern Defense with 1.e4: 2.d4 d6
1. e4 d6: Pirc Defense: Other Continuations

1. e4 d5: Scandinavian Defense

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 c6: Scandinavian Defense: Mieses-Kotrč, Main Line, 4.d4 Nf6 5.Nf3 c6
1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6: Scandinavian Defense: Mieses-Kotrč, Main Line, 4.d4 Nf6, Other Continuations
1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5: Scandinavian Defense: Mieses-Kotrč, Main Line, Other Continuations
1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6: Scandinavian Defense: Mieses-Kotrč, Gubinsky-Melts Defense
1. e4 d5 2. exd5 Qxd5: Scandinavian Defense: Mieses-Kotrč Variation, Other Continuations
1. e4 d5 2. exd5 Nf6 3. d4 Nxd5: Scandinavian Defense: Modern, Marshall Variation
1. e4 d5 2. exd5 Nf6: Scandinavian Defense: Modern Variation, Other Continuations
1. e4 d5: Scandinavian Defense: Other Continuations

1. e4 g6 2. d4 Bg7 3. Nc3: Modern Defense: Standard Line

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3 Nf6: Modern Defense: Standard Line, 3...d6 4.Be3 Nf6
1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3 a6: Modern Defense: Standard Line, 3...d6 4.Be3 a6
1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3: Modern Defense: Standard Line, 3...d6 4.Be3, Other Continuations
1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3: Modern Defense: Standard, Two Knights Variation
1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4: Modern Defense: Standard, Pseudo-Austrian Attack
1. e4 g6 2. d4 Bg7 3. Nc3 d6: Modern Defense: Standard Line, 3...d6, Other Continuations
1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3: Modern Defense: Standard Line, 3...c6 4.Nf3
1. e4 g6 2. d4 Bg7 3. Nc3: Modern Defense: Standard Line, Other Continuations

1. e4 g6: Modern Defense: Other Continuations

1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. Bc4: Modern Defense with 1.e4: 2.d4 Bg7 3.Nf3 d6 4.Bc4
1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c3: Modern Defense: Geller System
1. e4 g6 2. d4 Bg7 3. Nf3 d6: Modern Defense with 1.e4: 2.d4 Bg7 3.Nf3 d6, Other Continuations
1. e4 g6 2. d4 Bg7 3. Nf3 c5: (T) Sicilian Defense: Hyperaccelerated Dragon, Fianchetto, Pterodactyl Defense
1. e4 g6 2. d4 Bg7 3. Nf3: Modern Defense with 1.e4: 2.d4 Bg7 3.Nf3, Other Continuations
1. e4 g6 2. d4 Bg7 3. c4: (T) Modern Defense with 1.d4: 2.c4 Bg7 3.e4
1. e4 g6: Modern Defense: Other Continuations

1. e4 Nf6: Alekhine's Defense

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4: Alekhine's Defense: Modern, Main Line
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3: Alekhine's Defense: Modern Variation, Other Continuations
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6: Alekhine's Defense: Exchange Variation
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4: Alekhine's Defense: Normal Variation, 3.d4 d6 4.c4, Other Continuations
1. e4 Nf6 2. e5 Nd5: Alekhine's Defense: Normal Variation, Other Continuations
1. e4 Nf6: Alekhine's Defense: Other Continuations

1. e4: King's Pawn Opening: Other Continuations

1. e4 Nc6: Nimzowitsch Defense
1. e4 b6: King's Pawn Opening: Owen Defense
1. e4: King's Pawn Opening: Other Continuations

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6: (T) Semi-Slav Defense

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Qc2: (T) Semi-Slav Defense: Main Line, Stoltz Variation
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4: (T) Semi-Slav Defense: Main Line, Semi-Meran Variation (7.Bxc4) and Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 Bd6: (T) Semi-Slav Defense: Main Line, Chigorin Defense
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3: (T) Semi-Slav Defense: Main Line, Normal Variation, 6.Bd3
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3: (T) Semi-Slav Defense: Main Line, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 h6: (T) Semi-Slav Defense: 5.Bg5 h6
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 Nbd7: (T) Queen's Gambit Declined: Modern, Knight Defense, 5.Nf3 c6
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 dxc4: (T) Semi-Slav Defense Accepted
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6: (T) Semi-Slav Defense: Other Continuations

1. d4 Nf6 2. c4 e6 3. Nf3 d5: (T) Queen's Gambit Declined: 3.Nf3 Nf6, Other Continuations

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7: (T) Queen's Gambit Declined: Orthodox Defense
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 h6: (T) Queen's Gambit Declined: Neo-Orthodox Variation
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5: (T) Queen's Gambit Declined: Modern Variation, 4...Be7 5.Nf3
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7: (T) QGD: Three Knights Variation, 4...Be7, Harrwitz Attack (5.Bf4) and Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4: (T) QGD: Ragozin Defense
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3: (T) QGD: Three Knights Variation, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4: (T) Catalan Opening: Open Defense, Classical Line, 6.O-O O-O
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O c6 7. Qc2 Nbd7 8. Nbd2: Catalan Opening: Closed, Main Line
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2: (T) Catalan Opening: Closed, 4...Be7 5.Nf3
1. d4 Nf6 2. c4 e6 3. Nf3 d5: (T) Queen's Gambit Declined: 3.Nf3 Nf6, Other Continuations

1. d4 Nf6 2. c4 e6 3. Nf3: Indian Game: East Indian, Anti-Nimzo-Indian Variation, Other Continuations

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6: Queen's Indian Defense: Fianchetto, Nimzowitch Variation
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O: Queen's Indian Defense: Fianchetto, Classical Variation
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3: Queen's Indian Defense: Fianchetto, Traditional Line (4...Bb7) and Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3: Queen's Indian Defense: Petrosian Variation
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3: Queen's Indian Defense: Kasparov Variation
1. d4 Nf6 2. c4 e6 3. Nf3 b6: Queen's Indian Defense: Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2: Bogo-Indian Defense: 4.Bd2
1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+: Bogo-Indian Defense: Grünfeld Variation (4.Nbd2) and Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3: Indian Game: East Indian, Anti-Nimzo-Indian Variation, Other Continuations

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4: Nimzo-Indian Defense

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3: Nimzo-Indian Defense: Bishop Attack
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O: Nimzo-Indian Defense: Reshevsky Variation (5.Ne2) and Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5: Nimzo-Indian Defense: Hübner Variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3: Nimzo-Indian Defense: Normal Line, St. Petersburg Variation (4...b6) and Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O: Nimzo-Indian Defense: Classical Variation, 4...O-O
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5: Nimzo-Indian Defense: Classical, Berlin Variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5: Nimzo-Indian Defense: Classical, Noa Variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2: Nimzo-Indian Defense: Classical Variation, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3: Nimzo-Indian Defense: Three Knights Variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3: Nimzo-Indian Defense: Kmoch Variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4: Nimzo-Indian Defense: Other Continuations

1. d4 Nf6 2. c4 e6: Indian Game: East Indian Defense, 3.Nc3 d5 and Other Continuations

1. d4 Nf6 2. c4 e6 3. Nc3 d5 Bg5: (T) Queen's Gambit Declined: Modern Variation
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Be7 6. e3 c6: (T) Queen's Gambit Declined: Exchange, Positional Line, 5...c6 6.e3 Be7
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Be7: (T) Queen's Gambit Declined: Exchange, Positional Line, 5...Be7, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 c6: (T) Queen's Gambit Declined: Exchange, Positional Line, 5...c6
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5: (T) Queen's Gambit Declined: Exchange, Positional Line, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5: (T) Queen's Gambit Declined: Exchange Variation, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3 d5: (T) Queen's Gambit Declined: Queen's Knight Variation, 3...Nf6, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nc3: Indian Game: East Indian Defense, 3.Nc3, Other Continuations
1. d4 Nf6 2. c4 e6: Indian Game: East Indian Defense, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2: King's Indian Defense: Orthodox Variation

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1: King's Indian Defense: Classical System
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4: King's Indian Defense: Bayonet Attack
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Nd2: King's Indian Defense: Orthodox, Modern System
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6: King's Indian Defense: Orthodox, Aronin-Taimanov Defense, Other Continuations
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7: King's Indian Defense: Orthodox, Positional Defense
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Na6: King's Indian Defense: Orthodox, Glek Defense
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O: King's Indian Defense: Orthodox Variation, 6...e5 7.O-O
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5: King's Indian Defense: Petrosian Variation
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. Be3: King's Indian Defense: Gligorić System
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5: King's Indian Defense: Orthodox Variation, 6...e5, Other Continuations
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2: King's Indian Defense: Orthodox Variation, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3: King's Indian Defense: Normal Variation, 4.e4 d6 5.Nf3, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. h3: King's Indian Defense: Normal Variation, 4.e4 d6 5.Nf3 O-O 6.h3
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3: King's Indian Defense: Normal Variation, 4.e4 d6 5.Nf3, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3: King's Indian Defense: Sämisch Variation

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5: King's Indian Defense: Sämisch, Orthodox, Closed
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5: King's Indian Defense: Sämisch, Orthodox Variation, 7.Nge2 and Other Continuations
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6: King's Indian Defense: Sämisch, Yates Defense
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 c5: King's Indian Defense: Sämisch, Sämisch Gambit
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3: King's Indian Defense: Sämisch, Normal Defense, 6.Be3, Other Continuations
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Bg5: King's Indian Defense: Sämisch, Steiner Attack
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3: King's Indian Defense: Sämisch Variation, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7: King's Indian Defense, Normal Variation, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5: King's Indian Defense: Averbakh Variation
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2: King's Indian Defense: Standard Development
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4: King's Indian Defense: Four Pawns Attack
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3: King's Indian Defense: Makogonov Variation
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4: King's Indian Defense: Normal Variation, 4.e4, Other Continuations
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O: King's Indian Defense: Normal Variation, 4.Nf3 O-O
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d5 5. cxd5: (T) Grünfeld Defense: Three Knights Variation, 4...Bg7 5.cxd5
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d5 5. e3: (T) Grünfeld Defense: Burille Variation
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d5 5. Qb3: (T) Grünfeld Defense: Russian Variation
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d5 5. Bg5: (T) Grünfeld Defense: Petrosian System
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d5: (T) Grünfeld Defense: Three Knights Variation, 4...Bg7, Other Continuations
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7: King's Indian Defense: Normal Variation, Other Continuations

1. d4 Nf6 2. c4 g6: King's Indian Defense, Other Continuations

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3: (T) Grünfeld Defense: Exchange, Modern Exchange Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4: (T) Grünfeld Defense: Exchange, Classical Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5: Grünfeld Defense: Exchange Variation
1. d4 Nf6 2. c4 g6 3. Nc3: King's Indian Defense: 3.Nc3, Other Continuations
1. d4 Nf6 2. c4 g6 3. Nf3: King's Indian Defense: 3.Nf3
1. d4 Nf6 2. c4 g6 3. g3: King's Indian Defense: 3.g3
1. d4 Nf6 2. c4 g6: King's Indian Defense: Alekhine Anti-Grünfeld Variation (3.f3) and Other Continuations

1. d4 Nf6 2. c4 c5 3. d5 b5: Benko Gambit

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6: Benko Gambit Fully-Accepted
1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. b6: Benko Gambit Half-Accepted: Pawn Return Variation
1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5: Benko Gambit Half Accepted: Other Continuations
1. d4 Nf6 2. c4 c5 3. d5 b5: Benko Gambit: Other Continuations

1. d4 Nf6 2. c4 c5: Benoni Defense, Other Continuations

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. e4: Benoni Defense: Modern, Classical Variation
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3: Benoni Defense: Modern Variation, 4.Nc3 exd5 5.cxd5 d6 6.Nf3, Other Continuations
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4: Benoni Defense: Modern, King's Pawn Line
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6: Benoni Defense: Modern Variation, 4.Nc3 exd5 5.cxd5 d6, 6.g3 and Other Continuations
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3: Benoni Defense: Modern Variation, 4.Nc3, Other Continuations
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nf3: (T) Indian Game: East Indian, Anti-Nimzo-Indian Variation, 3...c5 4.d5
1. d4 Nf6 2. c4 c5 3. d5 e6: Benoni Defense: Modern Variation, Other Continuations
1. d4 Nf6 2. c4 c5 3. d5 e5: Benoni Defense: Czech Variation
1. d4 Nf6 2. c4 c5 3. d5: Benoni Defense: 3.d5, Other Continuations
1. d4 Nf6 2. c4 c5 3. Nf3: (T) English Opening: Symmetrical, Anti-Benoni Variation
1. d4 Nf6 2. c4 c5: Benoni Defense: Other Continuations

1. d4 Nf6 2. c4: Indian Game: 2.c4, Other Continuations

1. d4 Nf6 2. c4 d6 3. Nc3 Nbd7 4. Nf3 e5: (T) Old Indian Defense: Ukrainian, Two Knights Variation, 4...Nbd7
1. d4 Nf6 2. c4 d6 3. Nc3 Nbd7: Old Indian Defense: Duz-Khotimirsky Variation, Other Continuations
1. d4 Nf6 2. c4 d6 3. Nc3 e5: Old Indian Defense: Ukrainian Variation
1. d4 Nf6 2. c4 d6: Old Indian Defense: Other Continuations
1. d4 Nf6 2. c4 e5: Budapest Defense
1. d4 Nf6 2. c4 d5: (T) Queen's Gambit Declined: Marshall Defense
1. d4 Nf6 2. c4: Indian Game: 2.c4, Other Continuations

1. d4 Nf6 2. Nf3: Indian Game: Knights Variation

1. d4 Nf6 2. Nf3 d5 3. c4 dxc4 4. e3 e6 5. Bxc4 c5: (T) Queen's Gambit Accepted: Classical Defense
1. d4 Nf6 2. Nf3 d5 3. c4: Queen's Pawn Opening: Symmetrical Variation, 3.c4
1. d4 Nf6 2. Nf3 d5 3. Bf4: London System
1. d4 Nf6 2. Nf3 d5: Queen's Pawn Opening: Symmetrical Variation, Other Continuations
1. d4 Nf6 2. Nf3 g6: Indian Game: Knights Variation, East Indian Defense
1. d4 Nf6 2. Nf3 e6 3. Bg5: Indian Game: Torre Attack
1. d4 Nf6 2. Nf3 e6 3. e3: Indian Game: Yusupov-Rubinstein System
1. d4 Nf6 2. Nf3 e6 3. g3: Indian Game: Knights Variation, 2...e6 3.g3
1. d4 Nf6 2. Nf3 e6: Indian Game: Knights Variation, 2...e6, London System (3.Bf4) and Other Continuations
1. d4 Nf6 2. Nf3 c5: Indian Game: Spielmann-Indian Variation
1. d4 Nf6 2. Nf3 d6: Indian Game: Tartakower Defense
1. d4 Nf6 2. Nf3: Indian Game: Knights Variation, Other Continuations

1. d4 Nf6: Indian Game: Other Continuations

1. d4 Nf6 2. Bg5: Indian Game: Trompowsky Attack
1. d4 Nf6 2. Bf4: Indian Game: 2.Bf4
1. d4 Nf6 2. Nc3: Indian Game: 2.Nc3
1. d4 Nf6: Indian Game: Other Continuations

1. d4 d5 2. c4 c6: Slav Defense

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5: Slav Defense: Modern, Alapin Variation, Czech Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4: Slav Defense: Modern, Alapin Variation, Other Continuations
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4: Slav Defense: Modern, Two Knights Attack, Other Continuations
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6: Slav Defense: Modern, Chameleon Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3: Slav Defense: Modern, Three Knights Variation, Other Continuations
1. d4 d5 2. c4 c6 3. Nf3 Nf6: Slav Defense: Modern Line, 3...Nf6, Quiet Variation (4.e3) and Other Continuations
1. d4 d5 2. c4 c6 3. Nf3: Slav Defense: Modern, Triangle System (3.e6) and Other Continuations
1. d4 d5 2. c4 c6 3. Nc3: Slav Defense: 3.Nc3
1. d4 d5 2. c4 c6: Slav Defense: Exchange Variation (3.cxd5) and Other Continuations

1. d4 d5 2. c4: Queen's Gambit, Other Continuations

1. d4 d5 2. c4 e6 3. Nc3 c6: Queen's Gambit Declined: Semi-Slav Defense, Accelerated Move-Order
1. d4 d5 2. c4 e6 3. Nc3 Be7: Queen's Gambit Declined: Charousek Variation
1. d4 d5 2. c4 e6 3. Nc3 c5: Tarrasch Defense
1. d4 d5 2. c4 e6: Queen's Gambit Declined: Other Continuations
1. d4 d5 2. c4 dxc4 3. Nf3: Queen's Gambit Accepted: 3.Nf3
1. d4 d5 2. c4 dxc4 3. e4: Queen's Gambit Accepted: Central Variation
1. d4 d5 2. c4 dxc4 3. e3: Queen's Gambit Accepted: Old Variation
1. d4 d5 2. c4 dxc4: Queen's Gambit Accepted: Other Continuations
1. d4 d5 2. c4 Nc6: Queen's Gambit Declined: Chigorin Defense
1. d4 d5 2. c4 e5: Queen's Gambit Declined: Albin Countergambit
1. d4 d5 2. c4: Queen's Gambit: Other Continuations

1. d4 d5: Queen's Pawn Opening: 1...d5, Other Continuations

1. d4 d5 2. Nf3: Queen's Pawn Opening: Zukertort Variation
1. d4 d5 2. Bf4: Queen's Pawn Opening: Accelerated London System
1. d4 d5 2. Nc3: Queen's Pawn Opening: Chigorin Variation
1. d4 d5 2. e3: Queen's Pawn Opening: 1...d5 2.e3
1. d4 d5 2. Bg5: Queen's Pawn Opening: Levitsky Attack
1. d4 d5: Queen's Pawn Opening: 1...d5, Blackmar-Diemer Gambit (2.e4) and Other Continuations

1. d4 e6: Queen's Pawn Opening: Horwitz Defense

1. d4 e6 2. c4 f5: (T) Dutch Defense: Classical Variation
1. d4 e6 2. c4: Queen's Pawn Opening: Horwitz Defense, 2.c4, Other Continuations
1. d4 e6: Queen's Pawn Opening: Horwitz Defense, Other Continuations

1. d4 f5: Dutch Defense

1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nf3 Bg7 5. O-O O-O 6. c4: (T) Dutch Defense: Leningrad, Main Line, 5...O-O 6.O-O
1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nf3 Bg7: Dutch Defense: Fianchetto, Semi-Leningrad Variation, 4.Nf3 Bg7, Other Continuations
1. d4 f5 2. g3 Nf6 3. Bg2 g6: Dutch Defense: Fianchetto, Semi-Leningrad Variation, Other Continuations
1. d4 f5 2. g3 Nf6 3. Bg2 e6 4. Nf3 d5 5. c4 c6 6. O-O Bd6: (T) Dutch Defense: Classical, Stonewall Variation, Modern Variation
1. d4 f5 2. g3 Nf6 3. Bg2 e6: Dutch Defense: Fianchetto Attack, 2...Nf6 3.Bg2 e6, Other Continuations
1. d4 f5 2. g3: Dutch Defense: Fianchetto Attack, Other Continuations
1. d4 f5 2. c4: Dutch Defense: 2.c4
1. d4 f5: Dutch Defense: Other Continuations

1. d4 g6: Modern Defense with 1.d4

1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4: Modern Defense: Averbakh Variation
1. d4 g6 2. c4: Modern Defense with 1.d4: 2.c4, Other Continuations
1. d4 g6: Modern Defense: Other Continuations

1. d4: Queen's Pawn Opening, Other Continuations

1. d4 d6 2. Nf3: Queen's Pawn Opening: Tartakower Variation
1. d4 d6: Queen's Pawn Opening: 1...d6, 2.c4 and Other Continuations
1. d4 c5: Old Benoni Defense
1. d4: Queen's Pawn Opening: Other Continuations

1. Nf3 Nf6 2. c4: (T) English Opening: Anglo-Indian, King's Knight Variation

1. Nf3 Nf6 2. c4 g6: (T) English Opening: Anglo-Indian, King's Indian Defense
1. Nf3 Nf6 2. c4 e6 3. g3 d5: (T) English Opening: Neo-Catalan Defense
1. Nf3 Nf6 2. c4 e6 3. g3 b6: (T) English Opening: Anglo-Indian, King's Knight Variation, 2...e6 3.g3 b6
1. Nf3 Nf6 2. c4 e6: (T) English Opening: Anglo-Indian, King's Knight Variation, 2...e6, Other Continuations
1. Nf3 Nf6 2. c4 c5: (T) English Opening: Symmetrical Variation, 2.Nf3 Nf6
1. Nf3 Nf6 2. c4: (T) English Opening: Anglo-Indian, King's Knight Variation, Other Continuations

1. Nf3 Nf6 2. g3: Réti Opening: King's Indian Attack

1. Nf3 Nf6 2. g3 d5 3. Bg2 c6: (T) King's Indian Attack: Yugoslav Variation, 3.Bg2 c6
1. Nf3 Nf6 2. g3 d5: (T) King's Indian Attack: Yugoslav Variation, Other Continuations
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O 5. c4 d6 6. O-O Nbd7 7. Nc3 e5: (T) KID: Fianchetto, Debrecen, Classical Main Line
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O 5. c4 d6 6. O-O Nbd7: (T) KID: 3.Nf3 Bg7 4.g3 d6 5.Bg2 O-O 6.O-O Nbd7, Other Continuations
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O 5. c4 d6 6. O-O Nc6: (T) KID: Fianchetto, Yugoslav, Panno System, 6...Nc6
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O 5. c4 d6 6. O-O: (T) KID: 3.Nf3 Bg7 4.g3 d6 5.Bg2 O-O 6.O-O, Other Continuations
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O 5. c4: (T) Indian Game: East Indian, Przepiórka Variation, 3...Bg7 4.Bg2 O-O 5.c4, Other Continuations
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O: (T) Indian Game: East Indian, Przepiórka Variation, 3...Bg7 4.Bg2 O-O, 5.O-O and Other Continuations
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4: (T) Indian Game: East Indian, Przepiórka Variation, 3...Bg7 4.Bg2, Other Continuations
1. Nf3 Nf6 2. g3 g6: Réti Opening: King's Indian Attack, Symmetrical Defense, Other Continuations
1. Nf3 Nf6 2. g3: Réti Opening: King's Indian Attack, Other Continuations

1. Nf3: Réti Opening: Other Continuations

1. Nf3 Nf6: Réti Opening: 1...Nf6, Nimzo-Larsen Variation (2.b3) and Other Continuations
1. Nf3 d5 2. g3: King's Indian Attack
1. Nf3 d5 2. c4: Réti Opening: Réti Gambit
1. Nf3 d5: Réti Opening: 1...d5, Other Continuations
1. Nf3 c5 2. c4: (T) English Opening: Symmetrical Variation, 2.Nf3
1. Nf3 c5: Réti Opening: Sicilian Invitation, Other Continuations
1. Nf3 g6: Réti Opening: Kingside Fianchetto Variation
1. Nf3 f5: Réti Opening: Dutch Variation
1. Nf3: Réti Opening: Other Continuations

1. c4 Nf6: English Opening: Anglo-Indian Defense

1. c4 Nf6 2. Nc3 e5 3. Nf3: (T) English Opening: Two Knights Variation, 3.Nf3
1. c4 Nf6 2. Nc3 e5: English Opening: Two Knights Variation, Carls-Bremen System (3.g3) and Other Continuations
1. c4 Nf6 2. Nc3 g6: English Opening: Anglo-Indian, Queen's Knight Variation, 2...g6
1. c4 Nf6 2. Nc3 e6: English Opening: Anglo-Indian, Hedgehog System
1. c4 Nf6 2. Nc3: English Opening: Anglo-Indian, Queen's Knight Variation, Other Continuations
1. c4 Nf6: English Opening: Anglo-Indian Defense, Other Continuations

1. c4: English Opening: Other Continuations

1. c4 e5 2. Nc3 Nc6: English Opening: Reversed Sicilian, Closed
1. c4 e5 2. Nc3: English Opening: Reversed Sicilian Variation, Other Continuations
1. c4 e5: English Opening: King's English Variation, Other Continuations
1. c4 e6: English Opening: Agincourt Defense
1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. O-O O-O 7. d4: English Opening: Fianchetto, Ultra-Symmetrical, Mecking Variation
1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7: English Opening: Fianchetto, Ultra-Symmetrical Line, Other Continuations
1. c4 c5: English Opening: Symmetrical Variation, Other Continuations
1. c4 g6: English Opening: Great Snake Variation
1. c4: English Opening: Other Continuations

: Starting Position, Other Continuations

1. g3: King's Fianchetto Opening
1. f4: Bird's Opening
1. b3: Nimzowitsch-Larsen Attack
: Starting Position: Other Continuations

Testing

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