Dev Builds » 20251228-1359

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NCM plays each Stockfish dev build 20,000 times against Stockfish 14. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.

Summary

Host Duration Avg Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN

Commit

Commit ID 969285fa5dff3c8367784758627cde732a886727
Author anematode
Date 2025-12-28 13:59:09 UTC
Shared pawn history [Passed STC SMP](https://tests.stockfishchess.org/tests/view/694e506c572093c1986d7276): ``` LLR: 2.97 (-2.94,2.94) <0.00,2.00> Total: 14992 W: 3924 L: 3653 D: 7415 Ptnml(0-2): 20, 1547, 4090, 1820, 19 ``` [Passed LTC SMP](https://tests.stockfishchess.org/tests/live_elo/694ead61572093c1986d7365): ``` LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 41146 W: 10654 L: 10342 D: 20150 Ptnml(0-2): 17, 3999, 12225, 4319, 13 ``` [Passed a sanity check STC SMP post-refactoring](https://tests.stockfishchess.org/tests/view/69503997572093c1986d763a): ``` LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 46728 W: 12178 L: 11863 D: 22687 Ptnml(0-2): 82, 5093, 12685, 5436, 68 ``` (The large gain of the first STC was probably a fluke, and this result is more reasonable!) After shared correction history, Viz suggested we try sharing other histories, especially `pawnHistory`. As far as we're aware, sharing history besides correction history (like Caissa does) is novel. The implementation follows the same pattern as shared correction history – the size of the history table is scaled with `next_power_of_two(threadsInNumaNode)` and the entry is prefetched in `do_move`. A bit of refactoring was done to accommodate this new history. Note that we prefetch `&history->pawn_entry(*this)[pc][to]` rather than `&history->pawn_entry(*this)` because unlike the other entries, each entry contains multiple cache lines. closes https://github.com/official-stockfish/Stockfish/pull/6498 Bench: 2503391 Co-authored-by: Michael Chaly <Vizvezdenec@gmail.com>
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