Petrov's Defense
At 1400–1799 Elo, theory ends around half-move 13. The move that leaves it is a mistake in 22% of cases, 2.7 times as often as a move inside it.
Where theory ends
Half-move at which a game leaves what at least 100 games played. Half of all games end between the two outer numbers.
- up to 139911half-movehalf of the games: 10 to 13
- 1400–179913half-movehalf of the games: 11 to 15
- 1800+14half-movehalf of the games: 12 to 16
How risky the exit is
Share of moves that lose at least 10 points of winning chances, in the same stretch of the game (half-moves 8 to 24).
up to 1399
- Inside theory12.1%
- The move that leaves it35.4%
- After it19.8%
2.9× the risk of a move inside theory
1400–1799
- Inside theory8.1%
- The move that leaves it22.0%
- After it13.6%
2.7× the risk of a move inside theory
1800+
- Inside theory3.7%
- The move that leaves it12.3%
- After it9.2%
3.3× the risk of a move inside theory
Most common mistakes inside theory
Moves the engine rates down although many players choose them. The last move of each line is the mistake, the loss is the mean in points of winning chances.
- 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6124,621 played, 11.9 points lost
- 1. e4 e5 2. Nf3 Nf6 3. Bc4 Bc552,274 played, 16.1 points lost
- 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Bc516,509 played, 10.4 points lost
- 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6 5. Nc3 Bc5 6. Bc412,164 played, 22.5 points lost
- 1. e4 e5 2. Bc4 Nf6 3. Nf3 d5 4. exd5 Nxd510,417 played, 10.4 points lost
- 1. e4 e5 2. Bc4 Nf6 3. Nf3 h69,103 played, 21.3 points lost
Where does your theory end?
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Opening names from the Lichess opening database (CC0). A game belongs to the most specific named opening it reaches within 39 half-moves.