Opening Leak Lab

Center Game

C20 1. e4 e5 2. d4

Black scores 45.3% here across 2,759 club games — but the 7.8% who answer Nc6 score 41.6%, 4 points worse.

What Black actually plays here

Across 2,759 games from a Lichess-derived book of club play, Black scores 45.3% in this position. These are the replies people choose, and how each one works out.

ReplyGamesShare Black scoresVerdict
exd4 2,094 75.9% 48.2% holds up
Nc6 215 7.8% 41.6% below the line
d6 157 5.7% 31.8% below the line
d5 61 2.2% 33.6% below the line
f6 58 2.1% 25.0% below the line
Nf6 41 1.5% 41.5% below the line
Bd6 37 1.3% 31.1% below the line
Qh4 27 1.0% 35.2% 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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