UPDATED Latest abrok Development Version May 22nd 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: Stéphane Nicolet Date: Sat May 22 21:09:22 2021 +0200 Timestamp: 1621710562 Sometimes change the (materialist, positional) balance Our new nets output two values for the side to move in the last layer. We can interpret the first value as a material evaluation of the position, and the second one as the dynamic, positional value of the location of pieces. This patch changes the balance for the (materialist, positional) parts of the score from (128, 128) to (121, 135) when the piece material is equal between the two players, but keeps the standard (128, 128) balance when one player is at least an exchange up. Passed STC: LLR: 2.93 (-2.94,2.94) <-0.50,2.50> Total: 15936 W: 1421 L: 1266 D: 13249 Elo +3.38 Ptnml(0-2): 37, 1037, 5694, 1134, 66 https://tests.stockfishchess.org/tests/view/60a82df9ce8ea25a3ef0408f Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,3.50> Total: 13904 W: 516 L: 410 D: 12978 Elo +2.65 Ptnml(0-2): 4, 374, 6088, 484, 2 https://tests.stockfishchess.org/tests/view/60a8bbf9ce8ea25a3ef04101 closes https://github.com/official-stockfish/Stockfish/pull/3492 Bench: 3856635 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 22 19:23:15 2021 +0200 Timestamp: 1621704195 Tuning Search This patch tunes constant in search.cpp STC: LLR: 2.94 (-2.94,2.94) <-0.50,2.50> Total: 30648 W: 2580 L: 2410 D: 25658 Elo +1.93 Ptnml(0-2): 80, 1969, 11093, 2065, 117 https://tests.stockfishchess.org/tests/view/60a71d3cce8ea25a3ef03fae LTC: LLR: 2.95 (-2.94,2.94) <0.50,3.50> Total: 52896 W: 1776 L: 1617 D: 49503 Elo +1.04 Ptnml(0-2): 13, 1462, 23347, 1605, 21 https://tests.stockfishchess.org/tests/view/60a794ddce8ea25a3ef0400a closes https://github.com/official-stockfish/Stockfish/pull/3491 Bench: 4004731 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 22 19:02:36 2021 +0200 Timestamp: 1621702956 Simplify reduction for consecutive fails Revert the heuristic introduced in #3184, by which we reduced more the late sons of the root position after consecutive fail highs. --- Before new net architecture: STC: LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 226336 W: 20373 L: 20500 D: 185463 Elo -0.19 Ptnml(0-2): 755, 16087, 79595, 15992, 739 https://tests.stockfishchess.org/tests/view/609dec205085663412d08e9d LTC: LLR: 2.93 (-2.94,2.94) <-2.50,0.50> Total: 67432 W: 2411 L: 2375 D: 62646 Elo +0.19 Ptnml(0-2): 33, 1944, 29714, 2004, 21 https://tests.stockfishchess.org/tests/view/609ee30f5085663412d08fc3 --- After new net architecture: STC: LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 141752 W: 11591 L: 11617 D: 118544 Elo -0.06 Ptnml(0-2): 387, 9231, 51674, 9189, 395 https://tests.stockfishchess.org/tests/view/60a4320ace8ea25a3ef03cfd LTC: LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 294072 W: 9825 L: 9950 D: 274297 Elo -0.15 Ptnml(0-2): 121, 8610, 129681, 8521, 103 https://tests.stockfishchess.org/tests/view/60a51b5ece8ea25a3ef03dcd --- closes https://github.com/official-stockfish/Stockfish/pull/3490 Bench: 3752892 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: Joost VandeVondele Date: Sat May 22 07:35:39 2021 +0200 Timestamp: 1621661739 Update default net to nn-7756374aaed3.nnue trained with pytorch using the master branch and recommended settings, same data set as previously used: python train.py ../../all_d9_fishd9_d8_d10_shuffle.binpack ../../all_d9_fishd9_d8_d10_shuffle.binpack \ --gpus 1 --threads 2 --num-workers 2 --batch-size 16384 --progress_bar_refresh_rate 300 \ --smart-fen-skipping --random-fen-skipping 3 --features=HalfKAv2^ --lambda=1.0 \ --max_epochs=400 --seed $RANDOM --default_root_dir exp/run_8 passed STC: LLR: 2.93 (-2.94,2.94) <-0.50,2.50> Total: 21424 W: 2078 L: 1907 D: 17439 Elo +2.77 Ptnml(0-2): 80, 1512, 7385, 1627, 108 https://tests.stockfishchess.org/tests/view/60a6c749ce8ea25a3ef03f4d passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,3.50> Total: 67912 W: 2851 L: 2648 D: 62413 Elo +1.04 Ptnml(0-2): 40, 2348, 28984, 2537, 47 https://tests.stockfishchess.org/tests/view/60a722ecce8ea25a3ef03fb9 closes https://github.com/official-stockfish/Stockfish/pull/3489 Bench: 3779522 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: Guy Vreuls Date: Sat May 22 00:26:00 2021 +0200 Timestamp: 1621635960 Compact position structures Reorder the structures data members in position.h to reduce padding. Passed STC: https://tests.stockfishchess.org/tests/view/60a8011fce8ea25a3ef04069 LLR: 2.94 (-2.94,2.94) <-0.50,2.50> Total: 14120 W: 1214 L: 1067 D: 11839 Elo +3.62 Ptnml(0-2): 26, 857, 5161, 976, 40 --- Also tested for speed locally by Joost: Result of 50 runs ================== base (./stockfish.master ) = 2254919 +/- 4439 test (./stockfish.patch ) = 2274003 +/- 5278 diff = +19084 +/- 6386 ================== speedup = +0.0085 P(speedup > 0) = 1.0000 --- closes https://github.com/official-stockfish/Stockfish/pull/3488 No functional change. see source

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