Opening Leak Lab

Van't Kruijs Opening

A00 1. e3

Black scores 62.2% here across 2,640 club games — but the 6.6% who answer e6 score 58.3%, 4 points worse.

What Black actually plays here

Across 2,640 games from a Lichess-derived book of club play, Black scores 62.2% in this position. These are the replies people choose, and how each one works out.

ReplyGamesShare Black scoresVerdict
e5 1,263 47.8% 60.3% holds up
d5 623 23.6% 62.7% holds up
c5 252 9.5% 67.9% holds up
e6 174 6.6% 58.3% below the line
Nf6 94 3.6% 66.0% holds up
b6 56 2.1% 67.0% holds up
g6 49 1.9% 70.4% holds up
d6 38 1.4% 57.9% below the line
Nc6 35 1.3% 62.9% holds up
c6 31 1.2% 67.7% holds up

"Below the line" means the reply scores at least three points worse than the position does overall. Replies played fewer than 25 times are left out: the sample is too small to read.

Is this costing you anything?

A table of averages cannot tell you whether you go wrong here — only your own games can. Opening Leak Lab reads your Chess.com or Lichess archive, finds the decisions you repeat, and checks each one against this book and a bundled Stockfish.

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