ChessBench

Benchmarking Large Language Models on chess puzzles.

Puzzle 1

ID: HR783

White to move and find checkmate in 1 move.

Last Move

Solution

Model

Failure

OpenAI GPT-5.2 Pro

Incorrect Move

Expected Move

Qh4#

g5h4

Model Output

No output

—

Difficulty

Mate in 1

Source

lichess