Zukertort Opening
A04 1. Nf3
Black scores 45.8% here across 3,370 club games — but the 12.6% who answer Nc6 score 41.9%, 4 points worse.
What Black actually plays here
Across 3,370 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 |
|---|---|---|---|---|
| d5 | 1,265 | 37.5% | 45.4% | holds up |
| Nf6 | 513 | 15.2% | 52.3% | holds up |
| Nc6 | 426 | 12.6% | 41.9% | below the line |
| c5 | 312 | 9.3% | 47.9% | holds up |
| e6 | 277 | 8.2% | 43.1% | holds up |
| d6 | 180 | 5.3% | 46.9% | holds up |
| b6 | 106 | 3.1% | 46.2% | holds up |
| g6 | 99 | 2.9% | 37.9% | below the line |
| c6 | 59 | 1.8% | 39.8% | below the line |
| f5 | 56 | 1.7% | 50.9% | holds up |
| e5 | 39 | 1.2% | 41.0% | 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.