Openings

Where theory ends, opening by opening.

53 openings from 70 million games: when the book runs out, how risky the exit is, and which mistakes are common inside theory.

Sicilian Defense

8.1 million games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 4.6×

Open

Queen's Pawn Game

6.6 million games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 6.7×

Open

Caro-Kann Defense

4.9 million games

Theory ends at half-move (1400–1799): 14
Risk of the exit against a move inside theory: 5.2×

Open

French Defense

4.6 million games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 4.7×

Open

Italian Game

3.9 million games

Theory ends at half-move (1400–1799): 15
Risk of the exit against a move inside theory: 3.8×

Open

Scandinavian Defense

3.4 million games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 3.8×

Open

English Opening

2.4 million games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 5.5×

Open

Queen's Gambit Declined

2.2 million games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 5.2×

Open

King's Pawn Game

2.0 million games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 3.0×

Open

Scotch Game

1.7 million games

Theory ends at half-move (1400–1799): 15
Risk of the exit against a move inside theory: 2.9×

Open

Ruy Lopez

1.7 million games

Theory ends at half-move (1400–1799): 14
Risk of the exit against a move inside theory: 4.4×

Open

Zukertort Opening

1.6 million games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 3.0×

Open

Pirc Defense

1.6 million games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 4.4×

Open

Indian Defense

1.6 million games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 5.1×

Open

Philidor Defense

1.4 million games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 3.3×

Open

Modern Defense

1.3 million games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 3.4×

Open

Four Knights Game

1.2 million games

Theory ends at half-move (1400–1799): 15
Risk of the exit against a move inside theory: 3.6×

Open

Petrov's Defense

1.1 million games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 2.7×

Open

Bishop's Opening

1.1 million games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 4.0×

Open

Vienna Game

983 k games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 3.3×

Open

Van't Kruijs Opening

922 k games

Theory ends at half-move (1400–1799): 7
Risk of the exit against a move inside theory: 6.4×

Open

Nimzo-Larsen Attack

895 k games

Theory ends at half-move (1400–1799): 9
Risk of the exit against a move inside theory: 5.0×

Open

Slav Defense

895 k games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 4.1×

Open

Englund Gambit

875 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 3.1×

Open

Benoni Defense

802 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 4.8×

Open

Nimzowitsch Defense

794 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 3.5×

Open

King's Indian Defense

780 k games

Theory ends at half-move (1400–1799): 15
Risk of the exit against a move inside theory: 8.3×

Open

Hungarian Opening

765 k games

Theory ends at half-move (1400–1799): 9
Risk of the exit against a move inside theory: 7.0×

Open

Horwitz Defense

750 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 7.7×

Open

Bird Opening

706 k games

Theory ends at half-move (1400–1799): 9
Risk of the exit against a move inside theory: 8.2×

Open

Queen's Gambit Accepted

686 k games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 3.4×

Open

Alekhine Defense

668 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 5.0×

Open

Owen Defense

625 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 4.1×

Open

Dutch Defense

483 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 12.0×

Open

Three Knights Opening

481 k games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 3.3×

Open

King's Gambit Accepted

458 k games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 2.8×

Open

Center Game

442 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 3.5×

Open

Rapport-Jobava System

434 k games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 4.3×

Open

Mieses Opening

380 k games

Theory ends at half-move (1400–1799): 7
Risk of the exit against a move inside theory: 7.2×

Open

King's Indian Attack

333 k games

Theory ends at half-move (1400–1799): 12
Risk of the exit against a move inside theory: 8.6×

Open

Semi-Slav Defense

318 k games

Theory ends at half-move (1400–1799): 14
Risk of the exit against a move inside theory: 17.7×

Open

Ponziani Opening

318 k games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 3.6×

Open

Englund Gambit Declined

303 k games

Theory ends at half-move (1400–1799): 9
Risk of the exit against a move inside theory: 4.0×

Open

King's Gambit Declined

291 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 2.7×

Open

Rat Defense

290 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 3.9×

Open

English Defense

288 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 4.8×

Open

Nimzo-Indian Defense

286 k games

Theory ends at half-move (1400–1799): 13
Risk of the exit against a move inside theory: 13.2×

Open

King's Knight Opening

279 k games

Theory ends at half-move (1400–1799): 10
Risk of the exit against a move inside theory: 5.9×

Open

Elephant Gambit

267 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 3.4×

Open

Polish Opening

257 k games

Theory ends at half-move (1400–1799): 8
Risk of the exit against a move inside theory: 28.6×

Open

Van Geet Opening

252 k games

Theory ends at half-move (1400–1799): 9
Risk of the exit against a move inside theory: 4.1×

Open

Grob Opening

205 k games

Theory ends at half-move (1400–1799): 7

Open

Old Indian Defense

203 k games

Theory ends at half-move (1400–1799): 11
Risk of the exit against a move inside theory: 8.8×

Open

Opening names from the Lichess opening database (CC0). A game belongs to the most specific named opening it reaches within 39 half-moves.

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