Opening Leak Lab

Center Game: Paulsen Attack Variation

C22 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3

Black scores 47.5% here across 619 club games — but the 20.2% who answer d6 score 42.0%, 5 points worse.

What Black actually plays here

Across 619 games from a Lichess-derived book of club play, Black scores 47.5% in this position. These are the replies people choose, and how each one works out.

ReplyGamesShare Black scoresVerdict
Nf6 225 36.3% 48.0% holds up
d6 125 20.2% 42.0% below the line
b6 100 16.2% 47.0% holds up
Bb4+ 45 7.3% 63.3% holds up
Qe7 26 4.2% 34.6% below the line

"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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