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Opening

Pirc Defense

At 1400–1799 Elo, theory ends around half-move 12. The move that leaves it is a mistake in 12% of cases, 4.4 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
    11
    half-move
    half of the games: 9 to 14
  • 1400–1799
    12
    half-move
    half of the games: 10 to 14
  • 1800+
    13
    half-move
    half of the games: 10 to 15

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 theory4.0%
  • The move that leaves it18.6%
  • After it16.4%

4.6× the risk of a move inside theory

1400–1799

  • Inside theory2.8%
  • The move that leaves it12.4%
  • After it11.9%

4.4× the risk of a move inside theory

1800+

  • Inside theory1.4%
  • The move that leaves it7.6%
  • After it8.4%

5.5× 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. 1. d4 d6 2. e4 Nf6 3. e526,887 played, 14.8 points lost
  2. 1. e4 d6 2. Nf3 Nf6 3. d4 g612,357 played, 11.5 points lost
  3. 1. e4 d6 2. d4 Nf6 3. Nf310,969 played, 10.7 points lost
  4. 1. e4 d6 2. e56,474 played, 12.2 points lost
  5. 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Bc4 O-O 6. O-O Nbd74,057 played, 12.2 points lost
  6. 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5 Bg7 5. e5 dxe5 6. dxe5 Qxd1+ 7. Rxd1 Ng43,966 played, 20.8 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.