Opening Leak Lab

Sicilian Defense: French Variation, Open

B40 1. e4 c5 2. Nf3 e6 3. d4 cxd4

White scores 49.3% here across 2,243 club games — but the 5.6% who answer Qxd4 score 41.3%, 8 points worse.

What White actually plays here

Across 2,243 games from a Lichess-derived book of club play, White scores 49.3% in this position. These are the replies people choose, and how each one works out.

ReplyGamesShare White scoresVerdict
Nxd4 1,948 86.8% 49.9% holds up
Qxd4 126 5.6% 41.3% below the line
c3 121 5.4% 48.3% holds up
Bc4 42 1.9% 46.4% 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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