Latest abrok Development Version April 22nd (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 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Stefan Geschwentner Date: Sat Apr 22 11:04:09 2023 +0200 Timestamp: 1682154249 Less reduction for tt move. This idea is a result of my second condition combination tuning for reductions: https://tests.stockfishchess.org/tests/view/643ed5573806eca398f06d61 There were used two parameters per combination: one for the 'sign' of the first and the second condition in a combination. Values >= 50 indicate using a condition directly and values <= -50 means use the negation of a condition. Each condition pair (X,Y) had two occurances dependent of the order of the two conditions: - if X < Y the parameters used for more reduction - if X > Y the parameters used for less reduction - if X = Y then only one condition is present and A[X][X][0]/A[X][X][1] stands for using more/less reduction for only this condition. The parameter pair A[7][2][0] (value = -94.70) and A[7][2][1] (value = 93.60) was one of the strongest signals with values near 100/-100. Here condition nr. 7 was '(ss+1)->cutoffCnt > 3' and condition nr. 2 'move == ttMove'. For condition nr. 7 the negation is used because A[7][2][0] is negative. This translates finally to less reduction (because 7 > 2) for tt moves if child cutoffs <= 3. STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 65728 W: 17704 L: 17358 D: 30666 Elo +1.83 Ptnml(0-2): 184, 7092, 18008, 7354, 226 https://tests.stockfishchess.org/tests/view/643ff767ef2529086a7ed042 LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 139200 W: 37776 L: 37282 D: 64142 Elo +1.23 Ptnml(0-2): 58, 13241, 42509, 13733, 59 https://tests.stockfishchess.org/tests/view/6440bfa9ef2529086a7edbc7 closes https://github.com/official-stockfish/Stockfish/pull/4538 Bench: 3548023 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 Apr 22 10:59:33 2023 +0200 Timestamp: 1682153973 Simplify away depth condition for aspiration window adjust Simplification STC: https://tests.stockfishchess.org/tests/view/64351654596a20f264276ded LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 374664 W: 98942 L: 99089 D: 176633 Elo -0.14 Ptnml(0-2): 1049, 41767, 101878, 41558, 1080 Simplification LTC: https://tests.stockfishchess.org/tests/view/6439499f605991a801b4f684 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 457880 W: 123021 L: 123233 D: 211626 Elo -0.16 Ptnml(0-2): 166, 44739, 139335, 44541, 159 closes https://github.com/official-stockfish/Stockfish/pull/4534 Bench: 3879281 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: Guenther Demetz Date: Sat Apr 22 10:47:51 2023 +0200 Timestamp: 1682153271 Simplification of SEE verification logic Use same logic for all handled pieces. Don't prune the move if opponent King, Queen, Rook gets a discovered attack while or after the exchanges. remove an obsolete comment in position.cpp Passed STC non regression: https://tests.stockfishchess.org/tests/view/6437907594daa91835c290d0 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 107432 W: 28359 L: 28221 D: 50852 Elo +0.45 Ptnml(0-2): 298, 11724, 29524, 11882, 288 Passed LTC non-regression: https://tests.stockfishchess.org/tests/view/6438ed2ebd1a5470263c51e8 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 236288 W: 63656 L: 63656 D: 108976 Elo +0.00 Ptnml(0-2): 99, 22960, 72011, 22990, 84 closes https://github.com/official-stockfish/Stockfish/pull/4533 bench: 3741125 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 Apr 22 10:43:29 2023 +0200 Timestamp: 1682153009 Simplify away complexity in evaluation Simplification STC: https://tests.stockfishchess.org/tests/view/64394bc0605991a801b4f6f0 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 72360 W: 19313 L: 19138 D: 33909 Elo +0.84 Ptnml(0-2): 206, 7883, 19800, 8112, 179 Simplification LTC: https://tests.stockfishchess.org/tests/view/6439e788c233ce943b6bdac1 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 224992 W: 60665 L: 60654 D: 103673 Elo +0.02 Ptnml(0-2): 96, 21875, 68526, 21920, 79 closes https://github.com/official-stockfish/Stockfish/pull/4530 Bench: 3709369 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: Torom Date: Sat Apr 22 10:38:25 2023 +0200 Timestamp: 1682152705 Set the length of GIT_SHA to 8 characters Previously, the length of git commit hashes could vary depending on the git environment. closes https://github.com/official-stockfish/Stockfish/pull/4527 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: MinetaS Date: Sat Apr 22 10:37:14 2023 +0200 Timestamp: 1682152634 Remove some conditions at PV improvement reduction Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 63664 W: 17007 L: 16823 D: 29834 Elo +1.00 Ptnml(0-2): 163, 6998, 17336, 7162, 173 https://tests.stockfishchess.org/tests/view/6430b124028b029b01ac99f2 Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 90016 W: 24399 L: 24258 D: 41359 Elo +0.54 Ptnml(0-2): 52, 8672, 27405, 8841, 38 https://tests.stockfishchess.org/tests/view/64310e74028b029b01ad3131 closes https://github.com/official-stockfish/Stockfish/pull/4526 Bench: 3661938 see source

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