Polish Opening
A00 1. b4
Black scores 49.9% here across 603 club games — but the 19.7% who answer d5 score 45.8%, 4 points worse.
What Black actually plays here
Across 603 games from a Lichess-derived book of club play, Black scores 49.9% in this position. These are the replies people choose, and how each one works out.
| Reply | Games | Share | Black scores | Verdict |
|---|---|---|---|---|
| e5 | 292 | 48.4% | 51.9% | holds up |
| d5 | 119 | 19.7% | 45.8% | below the line |
| e6 | 71 | 11.8% | 46.5% | below the line |
| Nf6 | 40 | 6.6% | 48.8% | 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.