Opening

Slav Defense

At 1400–1799 Elo, theory ends around half-move 13. The move that leaves it is a mistake in 10% of cases, 4.1 times as often as a move inside it.

All openings

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 1399
12
half-move
half of the games: 10 to 14
1400–1799
13
half-move
half of the games: 11 to 15
1800+
14
half-move
half 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 theory2.5%
The move that leaves it14.2%
After it14.3%

5.7× the risk of a move inside theory

1400–1799

Inside theory2.5%
The move that leaves it10.3%
After it10.0%

4.1× the risk of a move inside theory

1800+

Inside theory1.4%
The move that leaves it6.8%
After it6.8%

4.7× 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. d4 c6 2. c4 d5 3. Nc3 Nf6 4. Nf3 Bg4 5. Ne5 Bh54,102 played, 15.6 points lost
1. c4 d5 2. d4 Nf6 3. Nc3 c6 4. Nf3 Bg4 5. Ne5 Bf52,585 played, 14.2 points lost
1. d4 d5 2. c4 c6 3. Nf3 Bg4 4. Ne5 Bh51,927 played, 18.8 points lost
1. Nf3 Nf6 2. d4 d5 3. c4 c6 4. Nc3 Bg4 5. Ne5 e61,862 played, 11.7 points lost
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. cxd5 cxd5 5. Nf3 Bf5 6. Qb3 b61,628 played, 23.8 points lost
1. d4 Nf6 2. c4 c6 3. Nc3 d5 4. Nf3 Bg4 5. Ne5 Bh5 6. Qb31,370 played, 12.7 points lost

Where does your theory end?

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More openings

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