Latest abrok Development Version June 23rd (SF The gift that keeps on giving

!! latest version !! Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: FauziAkram Date: Sun Jun 23 11:46:41 2024 +0200 Timestamp: 1719136001 Internal iterative reductions: decrease depth more For PV nodes without a ttMove, we decrease depth. But in this patch, additionally, if the current position is found in the TT, and the stored depth in the TT is greater than or equal to the current search depth, we decrease the search depth even further. Passed STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 84384 W: 22154 L: 21761 D: 40469 Elo +1.62 Ptnml(0-2): 292, 9972, 21315, 10277, 336 https://tests.stockfishchess.org/tests/view/666b0a4d602682471b064db6 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 92106 W: 23471 L: 23032 D: 45603 Elo +1.66 Ptnml(0-2): 79, 10155, 25154, 10578, 87 https://tests.stockfishchess.org/tests/view/666c423d602682471b064e56 closes https://github.com/official-stockfish/Stockfish/pull/5397 bench: 1038234 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: Shawn Xu Date: Sun Jun 23 11:41:48 2024 +0200 Timestamp: 1719135708 Simplify Bonus Formula In History Adjustment Inspired by a discord message [1] from Vizvezdenec, this patch simplifies the bonus adjustment bonus = bonus > 0 ? 2 * bonus : bonus / 2 to a constant addition, maintaining bonus average at around 0 in regular bench. As cj5716 pointed in discord [2], the constant bonus can also be considered as factoring tempo when calculating bonus, yielding a better value of the move. [1] https://discord.com/channels/435943710472011776/882956631514689597/1243877089443188776 [2] https://discord.com/channels/435943710472011776/813919248455827515/1252277437249622077 Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 29984 W: 7908 L: 7677 D: 14399 Elo +2.68 Ptnml(0-2): 95, 3502, 7594, 3679, 122 https://tests.stockfishchess.org/tests/view/666f7210602682471b064fa2 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 170136 W: 43214 L: 43145 D: 83777 Elo +0.14 Ptnml(0-2): 158, 19185, 46311, 19258, 156 https://tests.stockfishchess.org/tests/view/666fb32e602682471b064fb5 closes https://github.com/official-stockfish/Stockfish/pull/5401 bench 1438375 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: evqsx Date: Sun Jun 23 11:37:32 2024 +0200 Timestamp: 1719135452 Simplify static exchange evaluation pruning formula Passed STC: https://tests.stockfishchess.org/tests/view/666bda31602682471b064e1f LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 141696 W: 36932 L: 36826 D: 67938 Elo +0.26 Ptnml(0-2): 510, 16880, 35989, 16932, 537 Passed LTC: https://tests.stockfishchess.org/tests/view/666e6b67602682471b064f4b LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 159504 W: 40552 L: 40471 D: 78481 Elo +0.18 Ptnml(0-2): 130, 18160, 43103, 18217, 142 closes https://github.com/official-stockfish/Stockfish/pull/5400 bench: 1084115 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: Joost VandeVondele Date: Sun Jun 23 11:35:50 2024 +0200 Timestamp: 1719135350 CI/CD: play games this action plays games under fast-chess with a `debug=yes` compiled binary. It checks for triggered asserts in the code, or generally for engine disconnects. closes https://github.com/official-stockfish/Stockfish/pull/5403 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: xoto10 Date: Sun Jun 23 11:29:02 2024 +0200 Timestamp: 1719134942 Consider wider range of moves near leaves. try to avoid missing good moves for opponent or engine, by updating bestMove also when value == bestValue (i.e. value == alpha) under certain conditions. In particular require this is at higher depth in the tree, leaving the logic near the root unchanged, and only apply randomly. Avoid doing this near mate scores, leaving mate PVs intact. Passed SMP STC 6+0.06 th7 : LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 42040 W: 10930 L: 10624 D: 20486 Elo +2.53 Ptnml(0-2): 28, 4682, 11289, 4998, 23 https://tests.stockfishchess.org/tests/view/66608b00c340c8eed7757d1d Passed SMP LTC 24+0.24 th7 : LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 73692 W: 18978 L: 18600 D: 36114 Elo +1.78 Ptnml(0-2): 9, 7421, 21614, 7787, 15 https://tests.stockfishchess.org/tests/view/666095e8c340c8eed7757d49 closes https://github.com/official-stockfish/Stockfish/pull/5367 Bench 1205168 see source

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