Queen's Pawn Game: London System
D02 1. d4 d5 2. Nf3 Nf6 3. Bf4 c5 4. e3 Nc6 5. Nbd2 e6 6. c3
Black scores 45.8% here across 2,049 club games — but the 17.7% who answer Nc6 score 41.3%, 4 points worse.
What Black actually plays here
Across 2,049 games from a Lichess-derived book of club play, Black scores 45.8% in this position. These are the replies people choose, and how each one works out.
| Reply | Games | Share | Black scores | Verdict |
|---|---|---|---|---|
| e6 | 557 | 27.2% | 45.2% | holds up |
| Nc6 | 362 | 17.7% | 41.3% | below the line |
| Bf5 | 343 | 16.7% | 48.7% | holds up |
| c5 | 302 | 14.7% | 49.8% | holds up |
| Bg4 | 163 | 8.0% | 47.5% | holds up |
| g6 | 117 | 5.7% | 49.6% | holds up |
| c6 | 102 | 5.0% | 43.1% | holds up |
| h6 | 28 | 1.4% | 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.