French Defense: Exchange Variation, Monte Carlo Variation
C01 1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4
Black scores 45.9% here across 495 club games — but the 21.4% who answer c6 score 41.0%, 5 points worse.
What Black actually plays here
Across 495 games from a Lichess-derived book of club play, Black scores 45.9% in this position. These are the replies people choose, and how each one works out.
| Reply | Games | Share | Black scores | Verdict |
|---|---|---|---|---|
| Nf6 | 223 | 45.1% | 48.2% | holds up |
| c6 | 106 | 21.4% | 41.0% | below the line |
| dxc4 | 79 | 16.0% | 39.2% | 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.