Opening Leak Lab

Vienna Game: Max Lange Defense

C25 1. e4 e5 2. Nc3 Nc6

White scores 45.9% here across 439 club games — but the 7.7% who answer a3 score 41.2%, 5 points worse.

What White actually plays here

Across 439 games from a Lichess-derived book of club play, White scores 45.9% in this position. These are the replies people choose, and how each one works out.

ReplyGamesShare White scoresVerdict
Nf3 178 40.5% 46.1% holds up
Bc4 131 29.8% 45.0% holds up
f4 55 12.5% 53.6% holds up
a3 34 7.7% 41.2% 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.

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