Mate in 1
Benchmark page
Gemini 2.5 Pro scored 5.3% strict accuracy on ChessBench, solving 8 of 150 fixed Lichess tactics when the answer had to match the expected UCI move line exactly.
Strict accuracy
5.3%
Correct puzzles
8 / 150
Prompt tokens
104,847
Total cost
$4.70
Benchmark updated
Mar 25, 2026, 2:59 AM
Find the tactical line that creates a fork.
Find the line that wins an undefended piece.
Solve a forced mate in one move.
Solve a forced mate in two moves.
Find the tactical line that exploits a pin.
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It also links back to the benchmark methodology and exposes model-specific copy, numbers, and sample puzzle outcomes that are relevant to searches like "Gemini 2.5 Prochess benchmark" and "Gemini 2.5 Protactical reasoning results".
For the full dataset definition and scoring details, visit the ChessBench dataset and methodology page.
These examples add readable, model-specific context beyond a single leaderboard number.
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Expected line: g2c2
Model line: No parseable line returned
Parse status: missing
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Expected line: d5f7
Model line: No parseable line returned
Parse status: missing