Latest abrok Development Version July 6th (SF The gift that keeps on giving

!! latest version !! Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Muzhen Gaming Date: Sat Jul 6 18:00:09 2024 +0200 Timestamp: 1720281609 Simplify ttPv reduction formula This is a revert of 2046c92. This patch is based on the fact that the ttPv reduction has proven non-linear scaling (as documented in the code, along with testing guidelines); however, the original patch had (erroneously) not been tested at VLTC or longer. Simplification STC: https://tests.stockfishchess.org/tests/view/6689266e59cb3228a4759b28 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 100320 W: 25913 L: 25763 D: 48644 Elo +0.52 Ptnml(0-2): 270, 11842, 25750, 12064, 234 Simplification LTC: https://tests.stockfishchess.org/tests/view/66893103e59d990b103f6ab3 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 57078 W: 14466 L: 14282 D: 28330 Elo +1.12 Ptnml(0-2): 34, 6214, 15851, 6414, 26 closes https://github.com/official-stockfish/Stockfish/pull/5448 Bench: 1124658 see source
Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Muzhen Gaming Date: Sat Jul 6 17:58:23 2024 +0200 Timestamp: 1720281503 Simplify internal iterative reductions This is a revert of cc992e5. This patch is based on consistent observations that decreasing depth more in IIR generally has a bad scaling behaviour (good at STC, bad at longer time controls). Simplification STC: https://tests.stockfishchess.org/tests/view/6689266659cb3228a4759b26 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 96992 W: 24977 L: 24824 D: 47191 Elo +0.55 Ptnml(0-2): 251, 11497, 24851, 11642, 255 Simplification LTC: https://tests.stockfishchess.org/tests/view/668930ffe59d990b103f6ab1 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 35808 W: 9185 L: 8980 D: 17643 Elo +1.99 Ptnml(0-2): 25, 3776, 10101, 3973, 29 closes https://github.com/official-stockfish/Stockfish/pull/5447 Bench: 1097766 see source
Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Shawn Xu Date: Sat Jul 6 17:56:31 2024 +0200 Timestamp: 1720281391 Non-functional Fixes & Updates Fixes a missing default slot for dbg_extremes of, removes a extra newline, and updates SE elo estimate from https://tests.stockfishchess.org/tests/view/664ebd1e928b1fb18de4e4b7 while we are at it. closes https://github.com/official-stockfish/Stockfish/pull/5446 No functional change see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: FauziAkram Date: Sat Jul 6 17:54:22 2024 +0200 Timestamp: 1720281262 Simplify away eval in TM Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 40160 W: 10523 L: 10309 D: 19328 Elo +1.85 Ptnml(0-2): 129, 4543, 10524, 4753, 131 https://tests.stockfishchess.org/tests/view/6685ab8b99271ae49479dbe9 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 195672 W: 49681 L: 49639 D: 96352 Elo +0.07 Ptnml(0-2): 112, 20976, 55597, 21060, 91 https://tests.stockfishchess.org/tests/view/6686f27a7092ade1206f7889 closes https://github.com/official-stockfish/Stockfish/pull/5445 No functional change see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Shawn Xu Date: Sat Jul 6 17:48:11 2024 +0200 Timestamp: 1720280891 Simplify Away Countermove Heuristic Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 977824 W: 252072 L: 252888 D: 472864 Elo -0.29 Ptnml(0-2): 2518, 117120, 250560, 116088, 2626 https://tests.stockfishchess.org/tests/view/6683452d95b0d1e881e81541 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 81048 W: 20630 L: 20470 D: 39948 Elo +0.69 Ptnml(0-2): 36, 8915, 22464, 9071, 38 https://tests.stockfishchess.org/tests/view/66886b7b0c9d7c1ab33ed281 closes https://github.com/official-stockfish/Stockfish/pull/5441 bench 1276784 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Muzhen Gaming Date: Sat Jul 6 17:45:58 2024 +0200 Timestamp: 1720280758 VVLTC search tune Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/6688af640c9d7c1ab33ed327 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 16050 W: 4200 L: 3959 D: 7891 Elo +5.22 Ptnml(0-2): 0, 1383, 5018, 1624, 0 Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/6688e8900c9d7c1ab33efd60 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 44044 W: 11303 L: 10999 D: 21742 Elo +2.40 Ptnml(0-2): 1, 3973, 13772, 4273, 3 closes https://github.com/official-stockfish/Stockfish/pull/5444 Bench: 992058 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Stéphane Nicolet Date: Sat Jul 6 17:43:39 2024 +0200 Timestamp: 1720280619 Introduction evaluation grain of 16 (and randomize) This patch uses an evaluation grain of 16 in order to get more cutoffs in the alpha-beta algorithm. For a discussion of the efficiency of alpha-beta related to changes in the number of discrete values of terminal nodes, see for instance section 9.1.2 of Judea Pearl's classical book "Heuristics" : https://mat.uab.cat/~alseda/MasterOpt/Judea_Pearl-Heuristics_Intelligent_Search_Strategies_for_Computer_Problem_Solving.pdf Moreover, we add a small (-1, +1) random component after the quantification to help the search exploration a little bit. This is similar in spirit to the (-1, +1) random component already present in the function draw_value() to make Stockfish more robust in draw evaluations. passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 220960 W: 57249 L: 56668 D: 107043 Elo +0.91 Ptnml(0-2): 499, 26017, 56882, 26568, 514 https://tests.stockfishchess.org/tests/view/668907fb7edfb6f233f999f8 passed LTC : LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 48966 W: 12574 L: 12233 D: 24159 Elo +2.42 Ptnml(0-2): 14, 5233, 13654, 5562, 20 https://tests.stockfishchess.org/tests/view/6689105659cb3228a47598bf closes https://github.com/official-stockfish/Stockfish/pull/5449 bench: 1336007 see source

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