Opening Leak Lab

King's Pawn Game: Leonardis Variation

C20 1. e4 e5 2. d3

Black scores 57.9% here across 1,101 club games — but the 18.3% who answer Nf6 score 54.7%, 3 points worse.

What Black actually plays here

Across 1,101 games from a Lichess-derived book of club play, Black scores 57.9% in this position. These are the replies people choose, and how each one works out.

ReplyGamesShare Black scoresVerdict
Nc6 362 32.9% 64.1% holds up
Nf6 202 18.3% 54.7% below the line
Bc5 169 15.3% 58.3% holds up
d6 153 13.9% 51.0% below the line
d5 66 6.0% 54.5% below the line
h6 41 3.7% 57.3% 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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