Semi-Slav Defense
D43 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6
White scores 53.9% here across 865 club games — but the 57.7% who answer Bg5 score 50.5%, 3 points worse.
What White actually plays here
Across 865 games from a Lichess-derived book of club play, White scores 53.9% in this position. These are the replies people choose, and how each one works out.
| Reply | Games | Share | White scores | Verdict |
|---|---|---|---|---|
| Bg5 | 499 | 57.7% | 50.5% | below the line |
| e3 | 154 | 17.8% | 53.9% | holds up |
| Bf4 | 75 | 8.7% | 64.0% | holds up |
| cxd5 | 55 | 6.4% | 54.5% | holds up |
| g3 | 48 | 5.5% | 63.5% | 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.