| 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: Linmiao Xu
Date: Wed May 15 16:26:00 2024 +0200 Timestamp: 1715783160 Use same eval divisor for both nets Passed non-regression STC: https://tests.stockfishchess.org/tests/view/66428f146577e9d2c8a29cf8 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 241024 W: 62173 L: 62177 D: 116674 Elo -0.01 Ptnml(0-2): 904, 28648, 61407, 28654, 899 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/6643ae6f1f32a966da74977b LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 193710 W: 48762 L: 48717 D: 96231 Elo +0.08 Ptnml(0-2): 70, 21599, 53481, 21626, 79 closes https://github.com/official-stockfish/Stockfish/pull/5246 Bench: 1700680 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: Stefan Geschwentner
Date: Wed May 15 16:20:14 2024 +0200 Timestamp: 1715782814 Reduce more when improving and ttvalue is lower than alpha More reduction if position is improving but value from TT doesn't exceeds alpha but the tt move is excluded. This idea is based on following LMR condition tuning https://tests.stockfishchess.org/tests/view/66423a1bf9f4e8fc783cba37 by using only three of the four largest terms P[3], P[18] and P[12]. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 27840 W: 7309 L: 7004 D: 13527 Elo +3.81 Ptnml(0-2): 85, 3219, 7018, 3502, 96 https://tests.stockfishchess.org/tests/view/6643dc1cbc537f56194508ba Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 191280 W: 48656 L: 48020 D: 94604 Elo +1.16 Ptnml(0-2): 78, 20979, 52903, 21589, 91 https://tests.stockfishchess.org/tests/view/6643e543bc537f5619451683 closes https://github.com/official-stockfish/Stockfish/pull/5245 Bench: 1430835 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: mstembera
Date: Wed May 15 16:19:04 2024 +0200 Timestamp: 1715782744 Call adjustEval with correct parameters after rescore Set smallNet to false after rescoring so we call adjustEval() w/ correct parameters. STC: https://tests.stockfishchess.org/tests/view/664308687134c82f3f7a4003 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 146912 W: 37856 L: 37756 D: 71300 Elo +0.24 Ptnml(0-2): 566, 17562, 37122, 17618, 588 LTC: https://tests.stockfishchess.org/tests/view/6643a0821f32a966da7485d6 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 390414 W: 98015 L: 98173 D: 194226 Elo -0.14 Ptnml(0-2): 162, 43555, 107929, 43401, 160 closes https://github.com/official-stockfish/Stockfish/pull/5244 Bench: 1819318 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: Michael Chaly
Date: Wed May 15 16:15:15 2024 +0200 Timestamp: 1715782515 Add extra bonus to pawn history for a move that caused a fail low Basically the same idea as it is for continuation/main history, but it has some tweaks. 1) it has * 2 multiplier for bonus instead of full/half bonus - for whatever reason this seems to work better; 2) attempts with this type of big bonuses scaled somewhat poorly (or were unlucky at longer time controls), but after measuring the fact that average value of pawn history in LMR after adding this bonuses increased by substantial number (for multiplier 1,5 it increased by smth like 400~ from 8192 cap) attempts were made to make default pawn history negative to compensate it - and version with multiplier 2 and initial fill value -900 passed. Passed STC: https://tests.stockfishchess.org/tests/view/66424815f9f4e8fc783cba59 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 115008 W: 30001 L: 29564 D: 55443 Elo +1.32 Ptnml(0-2): 432, 13629, 28903, 14150, 390 Passed LTC: https://tests.stockfishchess.org/tests/view/6642f5437134c82f3f7a3ffa LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 56448 W: 14432 L: 14067 D: 27949 Elo +2.25 Ptnml(0-2): 36, 6268, 15254, 6627, 39 Bench: 1857237 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: Wed May 15 16:13:43 2024 +0200 Timestamp: 1715782423 Add extra bonus for high-depth condition Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 54208 W: 14058 L: 13717 D: 26433 Elo +2.19 Ptnml(0-2): 166, 6277, 13885, 6602, 174 https://tests.stockfishchess.org/tests/view/664136d8f9f4e8fc783c9b82 Passed LTC: LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 112548 W: 28492 L: 28018 D: 56038 Elo +1.46 Ptnml(0-2): 53, 12186, 31318, 12668, 49 https://tests.stockfishchess.org/tests/view/664143fef9f4e8fc783c9bf6 closes https://github.com/official-stockfish/Stockfish/pull/5242 Bench: 1725980 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: Wed May 15 16:09:30 2024 +0200 Timestamp: 1715782170 Use 5% less time on first move Stockfish appears to take too much time on the first move of a game and then not enough on moves 2,3,4... Probably caused by most of the factors that increase time usually applying on the first move. Attempts to give more time to the subsequent moves have not worked so far, but this change to simply reduce first move time by 5% worked. STC 10+0.1 : LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 78496 W: 20516 L: 20135 D: 37845 Elo +1.69 Ptnml(0-2): 340, 8859, 20456, 9266, 327 https://tests.stockfishchess.org/tests/view/663d47bf507ebe1c0e9200ba LTC 60+0.6 : LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 94872 W: 24179 L: 23751 D: 46942 Elo +1.57 Ptnml(0-2): 61, 9743, 27405, 10161, 66 https://tests.stockfishchess.org/tests/view/663e779cbb28828150dd9089 closes https://github.com/official-stockfish/Stockfish/pull/5235 Bench: 1876282 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: mstembera
Date: Mon May 13 07:32:32 2024 +0200 Timestamp: 1715578352 Optimize update_accumulator_refresh_cache() STC https://tests.stockfishchess.org/tests/view/664105df26ac5f9b286d30e6 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 178528 W: 46235 L: 45750 D: 86543 Elo +0.94 Ptnml(0-2): 505, 17792, 52142, 18363, 462 Combo of two yellow speedups https://tests.stockfishchess.org/tests/view/6640abf9d163897c63214f5c LLR: -2.93 (-2.94,2.94) <0.00,2.00> Total: 355744 W: 91714 L: 91470 D: 172560 Elo +0.24 Ptnml(0-2): 913, 36233, 103384, 36381, 961 https://tests.stockfishchess.org/tests/view/6628ce073fe04ce4cefc739c LLR: -2.93 (-2.94,2.94) <0.00,2.00> Total: 627040 W: 162001 L: 161339 D: 303700 Elo +0.37 Ptnml(0-2): 2268, 72379, 163532, 73105, 2236 closes https://github.com/official-stockfish/Stockfish/pull/5239 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: Linmiao Xu
Date: Mon May 13 07:30:18 2024 +0200 Timestamp: 1715578218 Re-evaluate some small net positions for more accurate evals Use main net evals when small net evals hint that higher eval accuracy may be worth the slower eval speeds. With Finny caches, re-evals with the main net are less expensive than before. Original idea by mstembera who I've added as co-author to this PR. Based on reEval tests by mstembera: https://tests.stockfishchess.org/tests/view/65e69187b6345c1b934866e5 https://tests.stockfishchess.org/tests/view/65e863aa0ec64f0526c3e991 A few variants of this patch also passed LTC: https://tests.stockfishchess.org/tests/view/663d2108507ebe1c0e91f407 https://tests.stockfishchess.org/tests/view/663e388c3a2f9702074bc152 Passed STC: https://tests.stockfishchess.org/tests/view/663dadbd1a61d6377f190e2c LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 92320 W: 23941 L: 23531 D: 44848 Elo +1.54 Ptnml(0-2): 430, 10993, 22931, 11349, 457 Passed LTC: https://tests.stockfishchess.org/tests/view/663ef48b2948bf9aa698690c LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 98934 W: 24907 L: 24457 D: 49570 Elo +1.58 Ptnml(0-2): 48, 10952, 27027, 11382, 58 closes https://github.com/official-stockfish/Stockfish/pull/5238 bench 1876282 Co-Authored-By: mstembera <5421953+> 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: Linmiao Xu
Date: Mon May 13 07:25:22 2024 +0200 Timestamp: 1715577922 Simplify npm constants when adjusting eval Passed non-regression STC: https://tests.stockfishchess.org/tests/view/663d0c4f507ebe1c0e91ec8d LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 162784 W: 41987 L: 41906 D: 78891 Elo +0.17 Ptnml(0-2): 520, 19338, 41591, 19427, 516 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/663d20fd507ebe1c0e91f405 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 457242 W: 115022 L: 115250 D: 226970 Elo -0.17 Ptnml(0-2): 271, 51566, 125179, 51330, 275 closes https://github.com/official-stockfish/Stockfish/pull/5237 Bench: 2238216 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: Michael Chaly
Date: Mon May 13 07:22:11 2024 +0200 Timestamp: 1715577731 Adjust standpat return value in qsearch Instead of returning value itself return value between it and beta for non pv nodes - analogous to what we do after actual search there. Passed STC: https://tests.stockfishchess.org/tests/view/663cb1b4c0b75d7f7b98188e LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 131552 W: 34131 L: 33673 D: 63748 Elo +1.21 Ptnml(0-2): 420, 15446, 33600, 15876, 434 Passed LTC: https://tests.stockfishchess.org/tests/view/663cda5dc0b75d7f7b981c6f LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 282798 W: 71658 L: 70833 D: 140307 Elo +1.01 Ptnml(0-2): 112, 31187, 77979, 32006, 115 closes https://github.com/official-stockfish/Stockfish/pull/5233 Bench: 1606672 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: Mon May 13 07:20:03 2024 +0200 Timestamp: 1715577603 VVLTC search tune Tuned at 111k games of VVLTC. Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/664090c6d163897c63214324 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 83046 W: 21071 L: 20747 D: 41228 Elo +1.36 Ptnml(0-2): 2, 7574, 26048, 7896, 3 Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/6640cb2abaa6260a5688dc17 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 68630 W: 17620 L: 17270 D: 33740 Elo +1.77 Ptnml(0-2): 4, 6242, 21471, 6596, 2 closes https://github.com/official-stockfish/Stockfish/pull/5240 Bench: 1752471 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: Mon May 13 07:16:59 2024 +0200 Timestamp: 1715577419 simplify away quietCheckEvasions pruning simplifies away the pruning of quiet evasion moves in quiescent search. Passed STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 343520 W: 88356 L: 88470 D: 166694 Elo -0.12 Ptnml(0-2): 1061, 40073, 89706, 39759, 1161 https://tests.stockfishchess.org/tests/view/663c7ddfc0b75d7f7b980f3b Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 168744 W: 42454 L: 42384 D: 83906 Elo +0.14 Ptnml(0-2): 75, 18678, 46782, 18776, 61 https://tests.stockfishchess.org/tests/view/663ce34fc0b75d7f7b981ed9 closes https://github.com/official-stockfish/Stockfish/pull/5231 bench 3681552 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: xu-shawn
Date: Mon May 13 07:15:25 2024 +0200 Timestamp: 1715577325 Fix usage of abs vs std::abs closes https://github.com/official-stockfish/Stockfish/pull/5229 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: Shawn Xu
Date: Thu May 9 09:02:57 2024 +0200 Timestamp: 1715238177 Simplify Away Negative Extension This patch simplifies away the negative extension applied when the value returned by the transposition table is assumed to fail low over the value of reduced search. Passed STC: LLR: 2.99 (-2.94,2.94) <-1.75,0.25> Total: 248736 W: 64293 L: 64302 D: 120141 Elo -0.01 Ptnml(0-2): 925, 29833, 62831, 29884, 895 https://tests.stockfishchess.org/tests/view/663bee3bca93dad645f7f64a Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 254970 W: 64289 L: 64308 D: 126373 Elo -0.03 Ptnml(0-2): 110, 28428, 70422, 28421, 104 https://tests.stockfishchess.org/tests/view/663c11f0c0b75d7f7b97d4bb closes https://github.com/official-stockfish/Stockfish/pull/5226 Bench: 2353057 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: Thu May 9 09:00:32 2024 +0200 Timestamp: 1715238032 Simplify depth formula based on score improvement Simplify depth formula based on score improvement. This idea was first tried by cj5716 Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 347104 W: 89683 L: 89804 D: 167617 Elo -0.12 Ptnml(0-2): 1357, 38824, 93307, 38711, 1353 https://tests.stockfishchess.org/tests/view/66378edf9819650825aa75d0 Passed LTC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 63000 W: 15851 L: 15694 D: 31455 Elo +0.87 Ptnml(0-2): 22, 5396, 20499, 5569, 14 https://tests.stockfishchess.org/tests/view/663c04e5c0b75d7f7b97d461 closes https://github.com/official-stockfish/Stockfish/pull/5225 Bench: 2691699 Co-Authored-By: cj5716 <125858804+> 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: Michael Chaly
Date: Thu May 9 08:56:36 2024 +0200 Timestamp: 1715237796 Remove conthist 3 from moves loop pruning Followup to previous gainer that made it twice less impactful there - this patch removes it entirely as a simplification. Passed STC: https://tests.stockfishchess.org/tests/view/6637aa7e9819650825aa93e0 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 26208 W: 6930 L: 6694 D: 12584 Elo +3.13 Ptnml(0-2): 113, 2997, 6652, 3225, 117 Passed LTC: https://tests.stockfishchess.org/tests/view/66383cba493aaaf4b7ea90c2 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 67866 W: 17294 L: 17118 D: 33454 Elo +0.90 Ptnml(0-2): 46, 7627, 18415, 7795, 50 closes https://github.com/official-stockfish/Stockfish/pull/5221 Bench: 2691699 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: Michael Chaly
Date: Thu May 9 08:52:06 2024 +0200 Timestamp: 1715237526 Simplify away conthist 3 from statscore Following previous elo gainer that gained by making conthist 3 less important in pruning this patch simplifies away this history from calculation of statscore. Passed STC: https://tests.stockfishchess.org/tests/view/6637aa7e9819650825aa93e0 LLR: 3.00 (-2.94,2.94) <-1.75,0.25> Total: 35392 W: 9352 L: 9120 D: 16920 Elo +2.28 Ptnml(0-2): 141, 4145, 8888, 4385, 137 Passed LTC: https://tests.stockfishchess.org/tests/view/66383cd8493aaaf4b7ea90c5 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 33948 W: 8714 L: 8503 D: 16731 Elo +2.16 Ptnml(0-2): 39, 3701, 9270, 3938, 26 closes https://github.com/official-stockfish/Stockfish/pull/5220 Bench: 2508571 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: Thu May 9 08:48:29 2024 +0200 Timestamp: 1715237309 simplify moveCountPruning no (significant) speedup upon renewed testing Passed stc: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 88992 W: 22779 L: 22633 D: 43580 Elo +0.57 Ptnml(0-2): 137, 8706, 26681, 8818, 154 https://tests.stockfishchess.org/tests/view/6636c4844b68b70d85800dae closes https://github.com/official-stockfish/Stockfish/pull/5213 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: Thu May 9 08:42:56 2024 +0200 Timestamp: 1715236976 Fix nodestime 1. The current time management system utilizes limits.inc and limits.time, which can represent either milliseconds or node count, depending on whether the nodestime option is active. There have been several modifications which brought Elo gain for typical uses (i.e. real-time matches), however some of these changes overlooked such distinction. This patch adjusts constants and multiplication/division to more accurately simulate real TC conditions when nodestime is used. 2. The advance_nodes_time function has a bug that can extend the time limit when availableNodes reaches exact zero. This patch fixes the bug by initializing the variable to -1 and make sure it does not go below zero. 3. elapsed_time function is newly introduced to print PV in the UCI output based on real time. This makes PV output more consistent with the behavior of trivial use cases. closes https://github.com/official-stockfish/Stockfish/pull/5186 No functional changes 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: rn5f107s2
Date: Thu May 9 08:38:04 2024 +0200 Timestamp: 1715236684 IIR on cutnodes if there is a ttMove but the ttBound is upper If there is an upper bound stored in the transposition table, but we still have a ttMove, the upperbound indicates that the last time the ttMove was tried, it failed low. This fail low indicates that the ttMove may not be good, so this patch introduces a depth reduction of one for cutnodes with such ttMoves. Passed STC: https://tests.stockfishchess.org/tests/view/663be4d1ca93dad645f7f45f LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 139424 W: 35900 L: 35433 D: 68091 Elo +1.16 Ptnml(0-2): 425, 16357, 35743, 16700, 487 Passed LTC: https://tests.stockfishchess.org/tests/view/663bec95ca93dad645f7f5c8 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 129690 W: 32902 L: 32390 D: 64398 Elo +1.37 Ptnml(0-2): 63, 14304, 35610, 14794, 74 closes https://github.com/official-stockfish/Stockfish/pull/5227 bench 2257437 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: Michael Chaly
Date: Thu May 9 08:33:07 2024 +0200 Timestamp: 1715236387 Refactor quiet moves pruning in qsearch Make it formula more in line with what we use in search - current formula is more or less the one we used years ago for search but since then it was remade, this patch remakes qsearch formula to almost exactly the same as we use in search - with sum of conthist 0, 1 and pawn structure history. Passed STC: https://tests.stockfishchess.org/tests/view/6639c8421343f0cb16716206 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 84992 W: 22414 L: 22019 D: 40559 Elo +1.61 Ptnml(0-2): 358, 9992, 21440, 10309, 397 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 119136 W: 30407 L: 29916 D: 58813 Elo +1.43 Ptnml(0-2): 46, 13192, 32622, 13641, 67 closes https://github.com/official-stockfish/Stockfish/pull/5224 Bench: 2138659 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: Thu May 9 08:29:33 2024 +0200 Timestamp: 1715236173 Depth dependent statscore based reductions Test a modification of Fawzi's PR #5223, against that PR. parameters locally tuned with nevergrad4sf. passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 1047424 W: 271478 L: 269649 D: 506297 Elo +0.61 Ptnml(0-2): 3851, 124543, 265290, 125982, 4046 https://tests.stockfishchess.org/tests/view/663b0889ca93dad645f7c58c passed LTC: LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 796236 W: 201712 L: 199825 D: 394699 Elo +0.82 Ptnml(0-2): 361, 88381, 218778, 90206, 392 https://tests.stockfishchess.org/tests/view/663be6adca93dad645f7f509 https://github.com/official-stockfish/Stockfish/pull/5228 Bench: 3346224 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: Thu May 9 08:26:35 2024 +0200 Timestamp: 1715235995 Tweak reduction formula based on depth The idea came to me by checking for trends from the megafauzi tunes, since the values of the divisor for this specific formula were as follows: stc: 15990 mtc: 16117 ltc: 14805 vltc: 12719 new vltc passed by Muzhen: 12076 This shows a clear trend related to time control, the higher it is, the lower the optimum value for the divisor seems to be. So I tried a simple formula, using educated guesses based on some calculations, tests show it works pretty fine, and it can still be further tuned at VLTC in the future to scale even better. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 431360 W: 110791 L: 109898 D: 210671 Elo +0.72 Ptnml(0-2): 1182, 50846, 110698, 51805, 1149 https://tests.stockfishchess.org/tests/view/663770409819650825aa269f Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 114114 W: 29109 L: 28625 D: 56380 Elo +1.47 Ptnml(0-2): 105, 12628, 31101, 13124, 99 https://tests.stockfishchess.org/tests/view/66378c099819650825aa73f6 https://github.com/official-stockfish/Stockfish/pull/5223 bench: 2273551 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: Sun May 5 15:11:53 2024 +0200 Timestamp: 1714914713 VVLTC search tune This patch is the result of two tuning stages: 1. ~32k games at 60+0.6 th8: https://tests.stockfishchess.org/tests/view/662d9dea6115ff6764c7f817 2. ~193k games at 80+0.8 th6, based on PR #5211: https://tests.stockfishchess.org/tests/view/663587e273559a8aa857ca00. Based on extensive VVLTC tuning and testing both before and after #5211, it is observed that introduction of new extensions positively affected the search tune results. Passed VVLTC 70+0.7 th7 1st sprt: https://tests.stockfishchess.org/tests/view/6636c6f04b68b70d85801409 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 18566 W: 4864 L: 4620 D: 9082 Elo +4.57 Ptnml(0-2): 0, 1608, 5827, 1844, 4 Passed VVLTC 70+0.7 th7 2nd sprt: https://tests.stockfishchess.org/tests/view/6636d4b84b68b70d85802ab7 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 43142 W: 11141 L: 10838 D: 21163 Elo +2.44 Ptnml(0-2): 4, 3915, 13427, 4224, 1 Passed VVLTC 70+0.7 3rd sprt: https://tests.stockfishchess.org/tests/view/66376b4f9819650825aa230b LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 40322 W: 10374 L: 10076 D: 19872 Elo +2.57 Ptnml(0-2): 1, 3660, 12544, 3952, 4 The first two sprts were run against passed #5211. The third sprt was run against latest master. closes https://github.com/official-stockfish/Stockfish/pull/5216 Bench: 2180675 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: cj5716
Date: Sun May 5 15:11:37 2024 +0200 Timestamp: 1714914697 Simplify accumulator refreshes Passed Non-Regression STC: https://tests.stockfishchess.org/tests/view/6631f5d5d01fb9ac9bcdc7d0 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 57472 W: 14979 L: 14784 D: 27709 Elo +1.18 Ptnml(0-2): 185, 6486, 15192, 6695, 178 closes https://github.com/official-stockfish/Stockfish/pull/5207 No functional change see source |