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Sonnet 5 - new chess engine

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A UCI chess engine written from scratch in 24 hours by Claude (Sonnet 5), as a benchmark of what one model can build, alone and unsupervised, in a single day.

Author: Steve Maughan

Language: C++20. Chosen for direct control over memory layout and bit-level operations (bitboards, PEXT-based move generation) without fighting a garbage collector or a borrow checker, and because its ecosystem for this kind of low-level, performance-sensitive code is the most mature of the three permitted languages.

Sonnet 5 download


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