| 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 |
| 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: Sat Jul 6 17:42:23 2024 +0200 Timestamp: 1720280543 CI give creditials for the clang-format action following up from earlier changes closes https://github.com/official-stockfish/Stockfish/pull/5450 No functional change see source |
| 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: Joost VandeVondele
Date: Fri Jul 5 15:43:49 2024 +0200 Timestamp: 1720187029 Correct and extend PV lines with decisive TB score Currently (after #5407), SF has the property that any PV line with a decisive TB score contains the corresponding TB position, with a score that correctly identifies the depth at which TB are entered. The PV line that follows might not preserve the game outcome, but can easily be verified and extended based on TB information. This patch provides this functionality, simply extending the PV lines on output, this doesn't affect search. Indeed, if DTZ tables are available, search based PV lines that correspond to decisive TB scores are verified to preserve game outcome, truncating the line as needed. Subsequently, such PV lines are extended with a game outcome preserving line until mate, as a possible continuation. These lines are not optimal mating lines, but are similar to what a user could produce on a website like https://syzygy-tables.info/ clicking always the top ranked move, i.e. minimizing or maximizing DTZ (with a simple tie-breaker for moves that have identical DTZ), and are thus an just an illustration of how to game can be won. A similar approach is already in established in https://github.com/joergoster/Stockfish/tree/matefish2 This also contributes to addressing #5175 where SF can give an incorrect TB win/loss for positions in TB with a movecounter that doesn't reflect optimal play. While the full solution requires either TB generated differently, or a search when ranking rootmoves, current SF will eventually find a draw in these cases, in practice quite quickly, e.g. `1kq5/q2r4/5K2/8/8/8/8/7Q w - - 96 1` `8/8/6k1/3B4/3K4/4N3/8/8 w - - 54 106` Gives the same results as master on an extended set of test positions from https://github.com/mcostalba/Stockfish/commit/9173d29c414ddb8f4bec74e4db3ccbe664c66bf9 with the exception of the above mentioned fen where this commit improves. With https://github.com/vondele/matetrack using 6men TB, all generated PVs verify: ``` Using ../Stockfish/src/stockfish.syzygyExtend on matetrack.epd with --nodes 1000000 --syzygyPath /chess/syzygy/3-4-5-6/WDL:/chess/syzygy/3-4-5-6/DTZ Engine ID: Stockfish dev-20240704-ff227954 Total FENs: 6555 Found mates: 3299 Best mates: 2582 Found TB wins: 568 ``` As repeated DTZ probing could be slow a procedure (100ms+ on HDD, a few ms on SSD), the extension is only done as long as the time taken is less than half the `Move Overhead` parameter. For tournaments where these lines might be of interest to the user, a suitable `Move Overhead` might be needed (e.g. TCEC has 1000ms already). closes https://github.com/official-stockfish/Stockfish/pull/5414 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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: Linmiao Xu
Date: Fri Jul 5 15:43:49 2024 +0200 Timestamp: 1720187029 Update 7 stat bonus/malus params Values found around 119k / 120k spsa games at 60+0.6: https://tests.stockfishchess.org/tests/view/6683112a192114e61f92f87a Passed STC: https://tests.stockfishchess.org/tests/view/66838148c4f539faa0326897 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 40928 W: 10835 L: 10508 D: 19585 Elo +2.78 Ptnml(0-2): 139, 4802, 10254, 5131, 138 Passed LTC: https://tests.stockfishchess.org/tests/view/668448a87a1863935cee42c6 LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 29208 W: 7559 L: 7253 D: 14396 Elo +3.64 Ptnml(0-2): 17, 3118, 8019, 3442, 8 closes https://github.com/official-stockfish/Stockfish/pull/5439 bench 1138753 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers 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: Joost VandeVondele
Date: Fri Jul 5 15:43:42 2024 +0200 Timestamp: 1720187022 Output from a fix depth onward, instead of 3s. To avoid output that depends on timing, output currmove and similar only from depth > 30 onward. Current choice of 3s makes the output of the same search depending on the system load, and doesn't always start at move 1. Depth 30 is nowadays reached in a few seconds on most systems. closes https://github.com/official-stockfish/Stockfish/pull/5436 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: Disservin
Date: Fri Jul 5 15:35:13 2024 +0200 Timestamp: 1720186513 Use explicit action permissions in CI Necessary modifications according to changes in the GitHub Action settings. closes https://github.com/official-stockfish/Stockfish/pull/5437 Follow up from the report by Yaron Avital (yaronav) earlier. 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: Joost VandeVondele
Date: Wed Jul 3 13:45:14 2024 +0200 Timestamp: 1720007114 CI: limit artifact uploads do not upload some unneeded intermediate directories, disable running authenticated git commands with the checkout action. Thanks to Yaron A for the report. closes https://github.com/official-stockfish/Stockfish/pull/5435 No functional change 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: Wed Jul 3 13:44:01 2024 +0200 Timestamp: 1720007041 Implement dbg_extremes_of An alternative to #5431, implements one function `dbg_extremes_of` to keep track of min and max. closes https://github.com/official-stockfish/Stockfish/pull/5434 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers 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: Joost VandeVondele
Date: Wed Jul 3 13:39:31 2024 +0200 Timestamp: 1720006771 Move info strings once more Follow up from #5404 ... current location leads to troubles with Aquarium GUI Fixes #5430 Now prints the information on threads and available processors at the beginning of search, where info about the networks is already printed (and is known to work) closes https://github.com/official-stockfish/Stockfish/pull/5433 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: Shahin M. Shahin
Date: Wed Jul 3 13:35:49 2024 +0200 Timestamp: 1720006549 Limit has_game_cycle() to only upcoming repetition use the original algorithm according to the paper http://web.archive.org/web/20201107002606/https://marcelk.net/2013-04-06/paper/upcoming-rep-v2.pdf, which detects accurately if a position has an upcoming repetition. The 'no progress' part of has_game_cycle has been removed, the function has been renamed to upcoming_repetition to reflect this. As a result of this fix, to the best of our knowledge, all PVs for completed iterations that yield a mate or decisive table base score now end in mate or contain a TB position, respectively. passed non-regression STC: https://tests.stockfishchess.org/tests/view/6679fa1d0c2db3fa2dcecbf2 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 63584 W: 16666 L: 16472 D: 30446 Elo +1.06 Ptnml(0-2): 186, 7552, 16146, 7698, 210 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/667ac965e439ed1c7a9ca042 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 464574 W: 117493 L: 117729 D: 229352 Elo -0.18 Ptnml(0-2): 311, 52468, 126974, 52214, 320 closes https://github.com/official-stockfish/Stockfish/pull/5432 bench: 1209805 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: Wed Jul 3 13:18:00 2024 +0200 Timestamp: 1720005480 Do Capture History Updates In Probcut This patch introduces history updates to probcut. Standard depth - 3 bonus and maluses are given to the capture that caused fail high and previously searched captures, respectively. Similar to #5243, a negative history fill is applied to compensate for an increase in capture history average, thus improving the scaling of this patch. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 84832 W: 21941 L: 21556 D: 41335 Elo +1.58 Ptnml(0-2): 226, 9927, 21688, 10386, 189 https://tests.stockfishchess.org/tests/view/6682fab9389b9ee542b1d029 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 104298 W: 26469 L: 26011 D: 51818 Elo +1.53 Ptnml(0-2): 43, 11458, 28677, 11940, 31 https://tests.stockfishchess.org/tests/view/6682ff06389b9ee542b1d0a0 closes https://github.com/official-stockfish/Stockfish/pull/5428 bench 1281351 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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: Dubslow
Date: Mon Jul 1 20:07:03 2024 +0200 Timestamp: 1719857223 Probcut in check no matter if pv or capture Passed STC: https://tests.stockfishchess.org/tests/view/6681e9c8c1657e386d294cef LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 217824 W: 56149 L: 56129 D: 105546 Elo +0.03 Ptnml(0-2): 587, 25926, 55848, 25982, 569 Passed LTC: https://tests.stockfishchess.org/tests/view/6681fcb8c1657e386d294db1 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 357552 W: 90546 L: 90671 D: 176335 Elo -0.12 Ptnml(0-2): 207, 40064, 98362, 39933, 210 Each half of this also passed STC+LTC separately closes https://github.com/official-stockfish/Stockfish/pull/5427 bench 1227870 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 Jul 1 20:04:13 2024 +0200 Timestamp: 1719857053 Update some params for pruning at shallow depth Values found around 82k / 120k spsa games at 60+0.6: https://tests.stockfishchess.org/tests/view/6681aca4481148df247298bd Passed STC: https://tests.stockfishchess.org/tests/view/6681c795c1657e386d2948fa LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 145216 W: 37595 L: 37122 D: 70499 Elo +1.13 Ptnml(0-2): 375, 17122, 37185, 17507, 419 Passed LTC: https://tests.stockfishchess.org/tests/view/6681d4eec1657e386d2949e0 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 154062 W: 39117 L: 38557 D: 76388 Elo +1.26 Ptnml(0-2): 67, 16874, 42608, 17396, 86 closes https://github.com/official-stockfish/Stockfish/pull/5425 bench 996419 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: Linmiao Xu
Date: Mon Jul 1 20:02:38 2024 +0200 Timestamp: 1719856958 Simplify worsening deduction in futility margin Passed non-regression STC: https://tests.stockfishchess.org/tests/view/66817d46442423e547141226 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 345408 W: 89146 L: 89266 D: 166996 Elo -0.12 Ptnml(0-2): 954, 41317, 88286, 41189, 958 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/66818dbe1e90a146232d1f62 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 173214 W: 43821 L: 43755 D: 85638 Elo +0.13 Ptnml(0-2): 108, 19407, 47492, 19511, 89 closes https://github.com/official-stockfish/Stockfish/pull/5424 bench 981017 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: Mon Jul 1 20:01:05 2024 +0200 Timestamp: 1719856865 Simplify rm.averageScore calculation Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 485056 W: 125222 L: 125497 D: 234337 Elo -0.20 Ptnml(0-2): 1384, 58197, 123614, 57976, 1357 https://tests.stockfishchess.org/tests/view/6681816d442423e54714133f Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 56622 W: 14301 L: 14115 D: 28206 Elo +1.14 Ptnml(0-2): 31, 6259, 15538, 6459, 24 https://tests.stockfishchess.org/tests/view/6681a9a5596d543edc677490 closes https://github.com/official-stockfish/Stockfish/pull/5423 bench: 1171203 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: Shahin M. Shahin
Date: Mon Jul 1 19:58:13 2024 +0200 Timestamp: 1719856693 Increase reduction based on correct expectation If the current node is not a cutNode then it means that the child is one in LMR and the cutoff count is expected, so more reduction when the cutoffs are expected Passed STC: https://tests.stockfishchess.org/tests/view/66815e791c5b344a34ca7090 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 64416 W: 16876 L: 16519 D: 31021 Elo +1.93 Ptnml(0-2): 150, 7670, 16264, 7921, 203 Passed LTC: https://tests.stockfishchess.org/tests/view/668162f61c5b344a34ca725c LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 78186 W: 19905 L: 19499 D: 38782 Elo +1.80 Ptnml(0-2): 55, 8561, 21437, 9003, 37 closes https://github.com/official-stockfish/Stockfish/pull/5422 bench: 1161531 see source |
| Windows x64 for Haswell CPUs 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 Jul 1 19:56:38 2024 +0200 Timestamp: 1719856598 Tweak multicut This patch is an original patch by author of Altair (https://github.com/Alex2262/AltairChessEngine) chess engine. It allows to produce more aggressive multicut compared to master by changing condition it needs to fulfil and also returns bigger value. Also has applied matetrack fix on top. Passed STC: https://tests.stockfishchess.org/tests/view/667223ab602682471b0650e2 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 50048 W: 13200 L: 12860 D: 23988 Elo +2.36 Ptnml(0-2): 181, 5822, 12679, 6160, 182 Passed LTC: https://tests.stockfishchess.org/tests/view/6672f777602682471b06515d LLR: 2.97 (-2.94,2.94) <0.50,2.50> Total: 706380 W: 179707 L: 177981 D: 348692 Elo +0.85 Ptnml(0-2): 656, 79250, 191665, 80950, 669 closes https://github.com/official-stockfish/Stockfish/pull/5421 bench 1148966 see source |
| Windows x64 for Haswell CPUs 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: Daniel Monroe
Date: Mon Jul 1 19:53:45 2024 +0200 Timestamp: 1719856425 Grade countermove bonus for low statscores Passed STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 338592 W: 88396 L: 87627 D: 162569 Elo +0.79 Ptnml(0-2): 1161, 40201, 85788, 41000, 1146 https://tests.stockfishchess.org/tests/view/6679d40c0c2db3fa2dcecbcc Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 83526 W: 21429 L: 21010 D: 41087 Elo +1.74 Ptnml(0-2): 54, 9173, 22913, 9546, 77 https://tests.stockfishchess.org/tests/view/667c5f2980450dba965911fc closes https://github.com/official-stockfish/Stockfish/pull/5418 bench: 1489815 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 Jul 1 19:50:32 2024 +0200 Timestamp: 1719856232 Simplify away a useless TTEntry::read() Not needed when we don hit an entry. closes https://github.com/official-stockfish/Stockfish/pull/5416 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: Taras Vuk
Date: Mon Jul 1 19:48:06 2024 +0200 Timestamp: 1719856086 Skip futility pruning if beta is below TB loss value Passed STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 77024 W: 20122 L: 19946 D: 36956 Elo +0.79 Ptnml(0-2): 278, 8754, 20277, 8920, 283 https://tests.stockfishchess.org/tests/view/66752d59602682471b0652f3 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 93114 W: 23623 L: 23477 D: 46014 Elo +0.54 Ptnml(0-2): 77, 9839, 26566, 10011, 64 https://tests.stockfishchess.org/tests/view/6676b3e1602682471b065395 closes https://github.com/official-stockfish/Stockfish/pull/5413 bench: 1003441 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: Mon Jul 1 19:44:17 2024 +0200 Timestamp: 1719855857 Fix typos in comments closes https://github.com/official-stockfish/Stockfish/pull/5409 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: Mon Jul 1 19:40:04 2024 +0200 Timestamp: 1719855604 Remove redundant inline constexpr implies inline anyway closes https://github.com/official-stockfish/Stockfish/pull/5406 No functional change see source |
| Windows x64 for Haswell CPUs 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: Mon Jul 1 19:37:25 2024 +0200 Timestamp: 1719855445 Move info output afer uciok fixes #5393 : an incompatibility with an older GUI (Chesspartner) fixes #5396 : an incompatibility with an older GUI (Fritz9) closes https://github.com/official-stockfish/Stockfish/pull/5404 No functional change see source |
| 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 |