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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).
Popularity (of the position at the end of the line) is expressed in per million games, denoted as 1/M. Bias is expressed in centipawns (cp). 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.
Transpositions are handled as described in the linked page. For any position in this collection only one canonical line is provided.

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.

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

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3: Sicilian Defense: Open, Najdorf, English Attack
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5: Sicilian Defense: Open, Najdorf Variation, 6.Bg5
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: Sicilian Defense: Open, Najdorf Variation, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5: Sicilian Defense: Open, Classical, Richter-Rauzer Variation
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: 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: Sicilian Defense: Open, Dragon Variation, Other Continuations
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6: Sicilian Defense: Open, Scheveningen Variation
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: 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: Sicilian Defense: 2.Nf3 d6, Other Continuations

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

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5: Sicilian Defense: Open, Lasker-Pelikán 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: Sicilian Defense: Taimanov Variation
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: Sicilian Defense: Open, Accelerated Dragon, Maróczy Bind Formation
1. e4 c5 2. Nf3 Nc6 3. d4: Sicilian Defense: Open, 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: Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Other Continuations
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: Sicilian Defense: Kan, Knight Variation
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3: Sicilian Defense: Kan, Modern Variation
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: Sicilian Defense: French Variation, Other Continuations

1. e4 c5: Sicilian Defense, Other Continuations

1. e4 c5 2. Nf3: Sicilian Defense: 2.Nf3, Other Continuations
1. e4 c5 2. Nc3 Nc6: Sicilian Defense: Closed, Traditional Line
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: Sicilian Defense: Smith-Morra Gambit
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: Ruy López Opening: Morphy Defense, Closed Defense
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: Ruy López Opening: Morphy Defense, Columbus Variation, 4...Nf6, Other Continuations
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6: Ruy López Opening: Morphy Defense, Other Continuations

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

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6: Ruy López Opening: Berlin Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 f5: Ruy López Opening: Jaenisch Gambit
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: Giuoco Piano Game: Main Line, 4...Nf6
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: 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: King's Pawn Opening: King's Knight Variation, 2…Nc6, Other Continuations

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4: Scotch Game: 3...exd4 4.Nxd4
1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4: Scotch Game: Scotch Gambit
1. e4 e5 2. Nf3 Nc6 3. d4: Scotch Game, Other Continuations
1. e4 e5 2. Nf3 Nc6: King's Pawn Opening: King's Knight Variation, 2...Nc6, Other Continuations

1. e4 e5 2. Nf3 Nc6: King's Pawn Opening: King's Knight Variation, Other Continuations

1. e4 e5 2. Nf3 Nf6: Petrov's Defense
1. e4 e5 2. Nf3 d6: Philidor Defense
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: Vienna Game
1. e4 e5 2. Bc4: Bishop's Opening
1. e4 e5 2. f4: King's Gambit
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: French Defense: Winawer, Advance Variation, 4...c5 5.a3, Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Bb4: French Defense: Winawer Variation, Other Continuations
1. e4 e6 2. d4 d5 3. Nc3 Nf6: French Defense: Classical Variation
1. e4 e6 2. d4 d5 3. Nc3 dxe4: French Defense: Rubinstein Variation
1. e4 e6 2. d4 d5 3. Nc3: French Defense: Normal Variation, 2...d5 3.Nc3, Other Continuations

1. e4 e6: French Defense, Other Continuations

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: French Defense: Tarrasch, Closed, 4.e5 Nfd7 5.Bd3, Other Continuations
1. e4 e6 2. d4 d5 3. Nd2: French Defense: Tarrasch Variation, Other Continuations
1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3: French Defense: Advance, Paulsen Attack
1. e4 e6 2. d4 d5 3. e5: French Defense: Advance Variation, Other Continuations
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: Caro-Kann Defense: Classical Variation
1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4: Caro-Kann Defense: Main Line, 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: Caro-Kann Defense: Advance Variation
1. e4 c6 2. d4 d5 3. exd5: Caro-Kann Defense: Exchange Variation
1. e4 c6 2. d4: Caro-Kann Defense: 2.d4, Other Continuations
1. e4 c6: Caro-Kann Defense, Other Continuations

1. e4 d6: Pirc Defense

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3: Pirc Defense: Classical Variation
1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4: Pirc Defense: Main Line, Austrian Attack
1. e4 d6 2. d4 Nf6 3. Nc3 g6: Pirc Defense: Main Line, Other Continuations
1. e4 d6 2. d4 Nf6 3. Nc3: Pirc Defense: 2.d4 Nf6 3.Nc3, Other Continuations
1. e4 d6: Pirc Defense, Other Continuations

1. e4 d5: Scandinavian Defense

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5: Scandinavian Defense: Mieses-Kotrč, Main Line
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: Scandinavian Defense, Other Continuations

1. e4 g6: Modern Defense

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3: Modern Defense: Standard Line, 3...d6 4.Be3
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: Modern Defense: Standard Line, Other Continuations
1. e4 g6 2. d4 Bg7 3. Nf3 d6: Modern Defense with 1.e4: 2.d4 Bg7 3.Nf3 d6
1. e4 g6 2. d4 Bg7 3. Nf3: Modern Defense with 1.e4: 2.d4 Bg7 3.Nf3, Other Continuations
1. e4 g6: Modern Defense, Other Continuations

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

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3: Alekhine's Defense: Modern Variation
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4: Alekhine's Defense: Normal Variation, 3.d4 d6 4.c4
1. e4 Nf6: Alekhine's Defense, 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: Transposition to Queen's Gambit Declined: 3.Nf3 Nf6

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3: Transposition to Semi-Slav Defense: Main Line
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6: Transposition to Semi-Slav Defense, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7: Transposition to QGD: Three Knights Variation, 4...Be7
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3: Transposition to QGD: Three Knights Variation, Other Continuations
1. d4 Nf6 2. c4 e6 3. Nf3 d5: Transposition to Queen's Gambit Declined: 3.Nf3 Nf6, Other Continuations

1. d4 Nf6 2. c4 e6: Indian Game: East Indian Defense, Other Continuations

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3: Queen's Indian Defense: Fianchetto 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+: Bogo-Indian Defense
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 4. e3: Nimzo-Indian Defense: Normal Line
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2: Nimzo-Indian Defense: Classical Variation
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4: Nimzo-Indian Defense, 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: King's Indian Defense: Orthodox, Aronin-Taimanov Defense
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: 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: King's Indian Defense, 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. f3: King's Indian Defense: Sämisch 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: 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: Transposition to Grünfeld Defense: Three Knights Variation, 4...Bg7
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 d5: Grünfeld Defense
1. d4 Nf6 2. c4 g6: King's Indian Defense, Other Continuations

1. d4 Nf6 2. c4 c5: Benoni Defense

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: Benko Gambit, 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: Benoni Defense: Modern Variation, Other Continuations
1. d4 Nf6 2. c4 c5: Benoni Defense, Other Continuations

1. d4 Nf6: Indian Game, Other Continuations

1. d4 Nf6 2. c4 d6: Old Indian Defense
1. d4 Nf6 2. c4 e5: Budapest Defense
1. d4 Nf6 2. c4: Indian Game: 2.c4, Other Continuations
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: Indian Game: Knights Variation, 2...e6
1. d4 Nf6 2. Nf3: Indian Game: Knights Variation, Other Continuations
1. d4 Nf6: Indian Game, Other Continuations

1. d4 d5: Queen's Pawn Opening: 1…d5

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3: Slav Defense: Modern, Three Knights Variation
1. d4 d5 2. c4 c6 3. Nf3: Slav Defense: Modern Line, Other Continuations
1. d4 d5 2. c4 c6: Slav Defense, 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: Queen's Gambit Accepted
1. d4 d5 2. c4: Queen's Gambit, Other Continuations
1. d4 d5 2. Nf3: Queen's Pawn Opening: Zukertort Variation
1. d4 d5: Queen's Pawn Opening: 1...d5, Other Continuations

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

1. d4 e6: Queen's Pawn Opening: Horwitz Defense
1. d4 f5 2. g3 Nf6 3. Bg2 g6: Dutch Defense: Fianchetto, Semi-Leningrad Variation
1. d4 f5 2. g3 Nf6 3. Bg2 e6: Dutch Defense: Fianchetto Attack, 2...Nf6 3.Bg2 e6
1. d4 f5: Dutch Defense, Other Continuations
1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4: Modern Defense: Averbakh Variation
1. d4 g6: Modern Defense, Other Continuations
1. d4 d6: Queen's Pawn Opening: 1...d6
1. d4 c5: Old Benoni Defense
1. d4: Queen's Pawn Opening, Other Continuations

1. Nf3: Réti Opening

1. Nf3 Nf6 2. c4 g6: Transposition to English Opening: Anglo-Indian, King's Indian Defense
1. Nf3 Nf6 2. c4 e6: Transposition to English Opening: Anglo-Indian, King's Knight Variation, 2...e6
1. Nf3 Nf6 2. c4: Transposition to English Opening: Anglo-Indian, King's Knight Variation, Other Continuations
1. Nf3 Nf6 2. g3 d5: Transposition to King's Indian Attack: Yugoslav Variation
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O 5. c4 d6 6. O-O Nbd7 7. Nc3 e5: Transposition to 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: Transposition to 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: Transposition to KID: Fianchetto, Yugoslav, Panno System, 6...Nc6
1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 O-O: Transposition to Indian Game: East Indian, Przepiórka Variation, 3...Bg7 4.Bg2 O-O, Other Continuations
1. Nf3 Nf6 2. g3 g6: Réti Opening: King's Indian Attack, Symmetrical Defense, Other Continuations
1. Nf3 Nf6: Réti Opening: 1..Nf6, Other Continuations
1. Nf3 d5: Réti Opening: 1..d5
1. Nf3 c5: Réti Opening: Sicilian Invitation
1. Nf3: Réti Opening, Other Continuations

1. c4: English Opening

1. c4 Nf6 2. Nc3 e5: English Opening: Two Knights Variation
1. c4 Nf6: English Opening: Anglo-Indian Defense, Other Continuations
1. c4 e5: English Opening: King's English Variation
1. c4 e6: English Opening: Agincourt Defense
1. c4 c5: English Opening: Symmetrical Variation
1. c4: English Opening, Other Continuations

Any Opening, Other Continuations

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

Testing

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