Second-Best Stockfish

Stockfish finds its two best moves and plays the second. When only one move is legal it plays that.

Your move

How Second-Best Stockfish plays

  • Stockfish 18 searches the position at full strength to depth 14 and reports its two best moves. The bot plays the second one.
  • When there is only one legal move it plays that move.

How to beat Second-Best Stockfish

  • In quiet positions the second-best move is often nearly as good as the best, so it plays close to full strength there.
  • It is weakest where exactly one move holds: a threat that needs a single answer, a piece that must be recaptured, a check with one good reply. Force those positions and it has to play the other move.
  • Repetition and the fifty-move rule are enforced: a position that comes back a third time is a draw.

Is the second-best move always bad?

No. It is only as bad as the gap between Stockfish’s first and second choice, which is tiny in many positions and huge in forcing ones.

After the game

Every finished game gets its own link, and you can open it as a full game review.

Second-Best Stockfish leaderboard