Latest abrok Development Version May 15th 2021 (SF The gift that keeps on giving )

!! latest version !! Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Vizvezdenec Date: Sat May 15 10:29:39 2021 +0200 Timestamp: 1621067379 Simplification for countermoves based pruning Simplify away two extra conditions in countermoves based pruning. These conditions (both of them) were introduced quite a long time ago via speculative LTCs and seem to no longer bring any benefit. passed STC https://tests.stockfishchess.org/tests/view/609e81f35085663412d08f31 LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 28488 W: 2487 L: 2382 D: 23619 Elo +1.28 Ptnml(0-2): 87, 1919, 10123, 2032, 83 passed LTC https://tests.stockfishchess.org/tests/view/609e9c085085663412d08f59 LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 33176 W: 1219 L: 1155 D: 30802 Elo +0.67 Ptnml(0-2): 13, 1036, 14423, 1106, 10 closes https://github.com/official-stockfish/Stockfish/pull/3468 Bench: 4749514 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: bmc4 Date: Sat May 15 10:16:01 2021 +0200 Timestamp: 1621066561 Simplify LMR rules for statScore We simplify two parts of LMR which seem not to bring strength anymore. --- Individual Tests: https://tests.stockfishchess.org/tests/view/609d1cc15085663412d0856a https://tests.stockfishchess.org/tests/view/609cb0cc7746e3dc74ffae8d https://tests.stockfishchess.org/tests/view/609d1c9f5085663412d08568 --- LTC: LLR: 2.97 (-2.94,2.94) <-2.50,0.50> Total: 84184 W: 3093 L: 3066 D: 78025 Elo +0.11 Ptnml(0-2): 47, 2755, 36458, 2788, 44 https://tests.stockfishchess.org/tests/view/609d84615085663412d08e2f --- While at it, we also update the Elo estimate of the previous rule in LMR, see: https://tests.stockfishchess.org/tests/view/609a933c3a33eb67a844f7ca https://tests.stockfishchess.org/tests/view/609a959c3a33eb67a844f7d5 https://tests.stockfishchess.org/tests/view/609afff73a33eb67a844f870 --- closes https://github.com/official-stockfish/Stockfish/pull/3464 Bench: 4156523 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: bmc4 Date: Sat May 15 10:07:40 2021 +0200 Timestamp: 1621066060 Remove early return in Probcut code We simplify away early return in ProbCut, as it seems not to bring any strength anymore. STC: LLR: 2.93 (-2.94,2.94) <-2.50,0.50> Total: 42632 W: 3705 L: 3617 D: 35310 Elo +0.72 Ptnml(0-2): 123, 2947, 15110, 2991, 145 https://tests.stockfishchess.org/tests/view/609c49da7746e3dc74ffae02 LTC: LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 35384 W: 1314 L: 1251 D: 32819 Elo +0.62 Ptnml(0-2): 11, 1130, 15355, 1177, 19 https://tests.stockfishchess.org/tests/view/609c71467746e3dc74ffae47 --- While at it, we also update the Elo estimate of ProbCut (see https://tests.stockfishchess.org/tests/view/609bfb597746e3dc74ffabe3). closes https://github.com/official-stockfish/Stockfish/pull/3462 bench: 3764662 see source

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