Bird Opening
At 1400–1799 Elo, theory ends around half-move 9. The move that leaves it is a mistake in 7% of cases, 8.2 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 13998half-movehalf of the games: 6 to 10
- 1400–17999half-movehalf of the games: 7 to 11
- 1800+10half-movehalf of the games: 8 to 12
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 theory0.8%
- The move that leaves it8.9%
- After it16.4%
11.3× the risk of a move inside theory
1400–1799
- Inside theory0.8%
- The move that leaves it6.7%
- After it11.4%
8.2× the risk of a move inside theory
1800+
- Inside theory0.8%
- The move that leaves it5.5%
- After it8.4%
7.0× 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 d5 2. f418,764 played, 18 points lost
- 1. f4 e5 2. Nf310,738 played, 12.7 points lost
- 1. f4 d5 2. e43,560 played, 11.5 points lost
- 1. f4 e5 2. e32,593 played, 10.4 points lost
- 1. f4 e5 2. fxe5 Nc6 3. Nf3 Qe71,812 played, 12.2 points lost
- 1. f4 d5 2. g3 Nc6 3. Nf3 e51,530 played, 11.8 points lost
Where does your theory end?
Enter your Lichess name and see your own positions. Free, in your browser, no sign-up.
Try it on your own gamesMore openings
Opening names from the Lichess opening database (CC0). A game belongs to the most specific named opening it reaches within 39 half-moves.