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Official Stockfish pre-release: Stockfish dev-20250426

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Official prerelease Stockfish dev-20250426
Rating Chess Engines Diary CEDR=3766

v. Stockfish dev-20250426:
Allow some nodes to spawn even deeper lmr searches

This includes nodes that were PvNode on a previous ply and only for non cutNodes and movecounts < 8.

Passed STC:
https://tests.stockfishchess.org/tests/view/680cdf2e3629b02d74b15576
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 123552 W: 31979 L: 31539 D: 60034
Ptnml(0-2): 322, 14449, 31803, 14871, 331

Passed LTC:
https://tests.stockfishchess.org/tests/view/680cf09a3629b02d74b15599
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 114306 W: 29310 L: 28837 D: 56159
Ptnml(0-2): 51, 12247, 32090, 12708, 57

closes https://github.com/official-stockfish/Stockfish/pull/6022

bench: 1585741

Stockfish dev-20250426 download (all file: avx2, avx512, bmi2, sse41-popcnt, vnni256, vnni512, 64)

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