Slav Defense: Three Knights Variation
D15 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3
Black scores 40.0% here across 429 club games — but the 16.6% who answer Bg4 score 36.6%, 3 points worse.
What Black actually plays here
Across 429 games from a Lichess-derived book of club play, Black scores 40.0% in this position. These are the replies people choose, and how each one works out.
| Reply | Games | Share | Black scores | Verdict |
|---|---|---|---|---|
| e6 | 147 | 34.3% | 39.1% | holds up |
| Bf5 | 99 | 23.1% | 42.4% | holds up |
| Bg4 | 71 | 16.6% | 36.6% | below the line |
| g6 | 36 | 8.4% | 47.2% | holds up |
| dxc4 | 35 | 8.2% | 35.7% | 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.