| 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 |
| 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: Wed May 19 20:34:37 2021 +0200 Timestamp: 1621449277 Remove Tempo The Tempo variable was introduced 10 years ago in our search because the classical evaluation function was antisymmetrical in White and Black by design to gain speed: Eval(White to play) = -Eval(Black to play) Nowadays our neural networks know which side is to play in a position when they evaluate a position and are trained on real games, so the neural network encodes the advantage of moving as an output of search. This patch shows that the Tempo variable is not necessary anymore. STC: LLR: 2.94 (-2.94,2.94) <-2.50,0.50> Total: 33512 W: 2805 L: 2709 D: 27998 Elo +1.00 Ptnml(0-2): 80, 2209, 12095, 2279, 93 https://tests.stockfishchess.org/tests/view/60a44ceace8ea25a3ef03d30 LTC: LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 53920 W: 1807 L: 1760 D: 50353 Elo +0.30 Ptnml(0-2): 16, 1617, 23650, 1658, 19 https://tests.stockfishchess.org/tests/view/60a477f0ce8ea25a3ef03d49 We also tried a match (20000 games) at STC using purely classical, result was neutral: https://tests.stockfishchess.org/tests/view/60a4eebcce8ea25a3ef03db5 Note: there are two locations left in search.cpp where we assume antisymmetry of evaluation (in relation with a speed optimization for null moves in lines 770 and 1439), but as the values are just used for heuristic pruning this approximation should not hurt too much because the order of magnitude is still true most of the time. closes https://github.com/official-stockfish/Stockfish/pull/3481 Bench: 4015864 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: Vizvezdenec
Date: Wed May 19 20:08:51 2021 +0200 Timestamp: 1621447731 Simplify usage of LMR for captures This patch simplifies a lot of "enablers" for LMR when move is a capture or promotion. After it we will have only 2 conditions - if node is a cutNode or if it's an allNode that was not in PV, so all captures or promotions wouldn't go thru LMR at any PVnodes. passed STC https://tests.stockfishchess.org/tests/view/60a40117ce8ea25a3ef03ca7 LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 58976 W: 4875 L: 4807 D: 49294 Elo +0.40 Ptnml(0-2): 176, 3897, 21270, 3973, 172 passed LTC https://tests.stockfishchess.org/tests/view/60a43ff8ce8ea25a3ef03d18 LLR: 2.93 (-2.94,2.94) <-2.50,0.50> Total: 65272 W: 2203 L: 2165 D: 60904 Elo +0.20 Ptnml(0-2): 28, 1936, 28668, 1978, 26 closes https://github.com/official-stockfish/Stockfish/pull/3480 bench 4110764 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: Prokop Randáček
Date: Wed May 19 19:38:44 2021 +0200 Timestamp: 1621445924 Use if instead of goto This PR inverts the if and removes goto in the generate_all function. closes https://github.com/official-stockfish/Stockfish/pull/3461 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Fanael Linithien
Date: Wed May 19 19:34:44 2021 +0200 Timestamp: 1621445684 Use packed 32-bit MMX operations for updating the PSQT accumulator This improves the speed of NNUE by a bit on old hardware that code path is intended for, like a Pentium III 1.13 GHz: 10 repeats of "./stockfish bench 16 1 13 default depth NNUE": Before: 54 642 504 897 cycles (± 0.12%) 62 301 937 829 instructions (± 0.03%) After: 54 320 821 928 cycles (± 0.13%) 62 084 742 699 instructions (± 0.02%) Speed of go depth 20 from startpos: Before: 53103 nps After: 53856 nps closes https://github.com/official-stockfish/Stockfish/pull/3476 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Yohaan Seth Nathan
Date: Wed May 19 19:34:44 2021 +0200 Timestamp: 1621445684 Use Markdown syntax in the readme provide direct links to the mentioned files. closes https://github.com/official-stockfish/Stockfish/pull/3477 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Vizvezdenec
Date: Wed May 19 19:34:37 2021 +0200 Timestamp: 1621445677 Do more continuation history based pruning This patch increases lmrDepth threshold for continuation history based pruning in search. This part of code for a long time was known to be really TC sensitive - decreasing this threshold easily passed lower time controls but failed badly at LTC, on the other hand it increase was part of a tuning that resulted in being negative at STC but was +12 elo at 180+1.8. After recent simplification of special conditions that sometimes increase it from 4 to 5 it was logical to overall test at longer time controls if 5 is better than 4 with deeper searches. reduces strenght on STC https://tests.stockfishchess.org/tests/view/60a3a8bbce8ea25a3ef03c74 ELO: -2.57 +-2.0 (95%) LOS: 0.6% Total: 20000 W: 1820 L: 1968 D: 16212 Elo -2.57 Ptnml(0-2): 68, 1582, 6836, 1458, 56 Passed LTC with STC bounds https://tests.stockfishchess.org/tests/view/60a027395085663412d090ce LLR: 2.93 (-2.94,2.94) <-0.50,2.50> Total: 175256 W: 6774 L: 6548 D: 161934 Elo +0.45 Ptnml(0-2): 91, 5808, 75604, 6034, 91 Passed VLTC with LTC bounds https://tests.stockfishchess.org/tests/view/60a2bccce229097940a037a7 LLR: 2.96 (-2.94,2.94) <0.50,3.50> Total: 65736 W: 1224 L: 1092 D: 63420 Elo +0.70 Ptnml(0-2): 5, 1012, 30706, 1136, 9 closes https://github.com/official-stockfish/Stockfish/pull/3473 bench 3689330 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: Tomasz Sobczyk
Date: Tue May 18 18:06:23 2021 +0200 Timestamp: 1621353983 New NNUE architecture and net Introduces a new NNUE network architecture and associated network parameters, as obtained by a new pytorch trainer. The network is already very strong at short TC, without regression at longer TC, and has potential for further improvements. https://tests.stockfishchess.org/tests/view/60a159c65085663412d0921d TC: 10s+0.1s, 1 thread ELO: 21.74 +-3.4 (95%) LOS: 100.0% Total: 10000 W: 1559 L: 934 D: 7507 Elo +21.74 Ptnml(0-2): 38, 701, 2972, 1176, 113 https://tests.stockfishchess.org/tests/view/60a187005085663412d0925b TC: 60s+0.6s, 1 thread ELO: 5.85 +-1.7 (95%) LOS: 100.0% Total: 20000 W: 1381 L: 1044 D: 17575 Elo +5.85 Ptnml(0-2): 27, 885, 7864, 1172, 52 https://tests.stockfishchess.org/tests/view/60a2beede229097940a03806 TC: 20s+0.2s, 8 threads LLR: 2.93 (-2.94,2.94) <0.50,3.50> Total: 34272 W: 1610 L: 1452 D: 31210 Elo +1.60 Ptnml(0-2): 30, 1285, 14350, 1439, 32 https://tests.stockfishchess.org/tests/view/60a2d687e229097940a03c72 TC: 60s+0.6s, 8 threads LLR: 2.94 (-2.94,2.94) <-2.50,0.50> Total: 45544 W: 1262 L: 1214 D: 43068 Elo +0.37 Ptnml(0-2): 12, 1129, 20442, 1177, 12 The network has been trained (by vondele) using the https://github.com/glinscott/nnue-pytorch/ trainer (started by glinscott), specifically the branch https://github.com/Sopel97/nnue-pytorch/tree/experiment_56. The data used are in 64 billion positions (193GB total) generated and scored with the current master net d8: https://drive.google.com/file/d/1hOOYSDKgOOp38ZmD0N4DV82TOLHzjUiF/view?usp=sharing d9: https://drive.google.com/file/d/1VlhnHL8f-20AXhGkILujnNXHwy9T-MQw/view?usp=sharing d10: https://drive.google.com/file/d/1ZC5upzBYMmMj1gMYCkt6rCxQG0GnO3Kk/view?usp=sharing fishtest_d9: https://drive.google.com/file/d/1GQHt0oNgKaHazwJFTRbXhlCN3FbUedFq/view?usp=sharing This network also contains a few architectural changes with respect to the current master: Size changed from 256x2-32-32-1 to 512x2-16-32-1 ~15-20% slower ~2x larger adds a special path for 16 valued ClippedReLU fixes affine transform code for 16 inputs/outputs, buy using InputDimensions instead of PaddedInputDimensions this is safe now because the inputs are processed in groups of 4 in the current affine transform code The feature set changed from HalfKP to HalfKAv2 Includes information about the kings like HalfKA Packs king features better, resulting in 8% size reduction compared to HalfKA The board is flipped for the black's perspective, instead of rotated like in the current master PSQT values for each feature the feature transformer now outputs a part that is fowarded directly to the output and allows learning piece values more directly than the previous network architecture. The effect is visible for high imbalance positions, where the current master network outputs evaluations skewed towards zero. 8 PSQT values per feature, chosen based on (popcount(pos.pieces()) - 1) / 4 initialized to classical material values on the start of the training 8 subnetworks (512x2->16->32->1), chosen based on (popcount(pos.pieces()) - 1) / 4 only one subnetwork is evaluated for any position, no or marginal speed loss A diagram of the network is available: https://user-images.githubusercontent.com/8037982/118656988-553a1700-b7eb-11eb-82ef-56a11cbebbf2.png A more complete description: https://github.com/glinscott/nnue-pytorch/blob/master/docs/nnue.md closes https://github.com/official-stockfish/Stockfish/pull/3474 Bench: 3806488 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: Stéphane Nicolet
Date: Mon May 17 10:47:14 2021 +0200 Timestamp: 1621241234 Small clean-ups - Comment for Countemove pruning -> Continuation history - Fix comment in input_slice.h - Shorter lines in Makefile - Comment for scale factor - Fix comment for pinners in see_ge() - Change Thread.id() signature to size_t - Trailing space in reprosearch.sh - Add Douglas Matos Gomes to the AUTHORS file - Introduce comment for undo_null_move() - Use Stockfish coding style for export_net() - Change date in AUTHORS file closes https://github.com/official-stockfish/Stockfish/pull/3416 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Vizvezdenec
Date: Sat May 15 10:29:39 2021 +0200 Timestamp: 1621067379 Simplification for countermoves based pruning Simplify away two extra conditions in countermoves based pruning. These conditions (both of them) were introduced quite a long time ago via speculative LTCs and seem to no longer bring any benefit. passed STC https://tests.stockfishchess.org/tests/view/609e81f35085663412d08f31 LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 28488 W: 2487 L: 2382 D: 23619 Elo +1.28 Ptnml(0-2): 87, 1919, 10123, 2032, 83 passed LTC https://tests.stockfishchess.org/tests/view/609e9c085085663412d08f59 LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 33176 W: 1219 L: 1155 D: 30802 Elo +0.67 Ptnml(0-2): 13, 1036, 14423, 1106, 10 closes https://github.com/official-stockfish/Stockfish/pull/3468 Bench: 4749514 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 15 10:16:01 2021 +0200 Timestamp: 1621066561 Simplify LMR rules for statScore We simplify two parts of LMR which seem not to bring strength anymore. --- Individual Tests: https://tests.stockfishchess.org/tests/view/609d1cc15085663412d0856a https://tests.stockfishchess.org/tests/view/609cb0cc7746e3dc74ffae8d https://tests.stockfishchess.org/tests/view/609d1c9f5085663412d08568 --- LTC: LLR: 2.97 (-2.94,2.94) <-2.50,0.50> Total: 84184 W: 3093 L: 3066 D: 78025 Elo +0.11 Ptnml(0-2): 47, 2755, 36458, 2788, 44 https://tests.stockfishchess.org/tests/view/609d84615085663412d08e2f --- While at it, we also update the Elo estimate of the previous rule in LMR, see: https://tests.stockfishchess.org/tests/view/609a933c3a33eb67a844f7ca https://tests.stockfishchess.org/tests/view/609a959c3a33eb67a844f7d5 https://tests.stockfishchess.org/tests/view/609afff73a33eb67a844f870 --- closes https://github.com/official-stockfish/Stockfish/pull/3464 Bench: 4156523 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 15 10:07:40 2021 +0200 Timestamp: 1621066060 Remove early return in Probcut code We simplify away early return in ProbCut, as it seems not to bring any strength anymore. STC: LLR: 2.93 (-2.94,2.94) <-2.50,0.50> Total: 42632 W: 3705 L: 3617 D: 35310 Elo +0.72 Ptnml(0-2): 123, 2947, 15110, 2991, 145 https://tests.stockfishchess.org/tests/view/609c49da7746e3dc74ffae02 LTC: LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 35384 W: 1314 L: 1251 D: 32819 Elo +0.62 Ptnml(0-2): 11, 1130, 15355, 1177, 19 https://tests.stockfishchess.org/tests/view/609c71467746e3dc74ffae47 --- While at it, we also update the Elo estimate of ProbCut (see https://tests.stockfishchess.org/tests/view/609bfb597746e3dc74ffabe3). closes https://github.com/official-stockfish/Stockfish/pull/3462 bench: 3764662 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: Unai Corzo
Date: Sat May 15 09:40:40 2021 +0200 Timestamp: 1621064440 Remove BoolConditions from tuning code Remove BoolConditions from tuning code, as the feature does not work and the code has not be touched in years. 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 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: Wed May 12 17:13:52 2021 +0200 Timestamp: 1620832432 Simplify LMR rule for non-checking captures We simplify away the complicated rule in LMR for "non-checking captures likely to be bad", as it seems not to bring any strength anymore. STC: LLR: 2.94 (-2.94,2.94) <-2.50,0.50> Total: 55256 W: 4972 L: 4897 D: 45387 Elo +0.47 Ptnml(0-2): 177, 3976, 19234, 4077, 164 https://tests.stockfishchess.org/tests/view/609adf3b3a33eb67a844f842 LTC: LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 10344 W: 437 L: 353 D: 9554 Elo +2.82 Ptnml(0-2): 1, 322, 4449, 392, 8 https://tests.stockfishchess.org/tests/view/609b3dfa3a33eb67a844f88e -- While at it, we also update the Elo estimate of the previous rule in LMR (see https://tests.stockfishchess.org/tests/view/609af2a63a33eb67a844f867). closes https://github.com/official-stockfish/Stockfish/pull/3460 Bench: 3840688 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: EntityFX
Date: Tue May 11 19:45:14 2021 +0200 Timestamp: 1620755114 E2K: added support for MCST Elbrus 2000 CPU architecture e2k (Elbrus 2000) - this is a VLIW/EPIC architecture, the like Intel Itanium (IA-64) architecture. The architecture has half native / half software support for most Intel/AMD SIMD (e.g. MMX/SSE/SSE2/SSE3/SSSE3/SSE4.1/SSE4.2/AES/AVX/AVX2 & 3DNow!/SSE4a/XOP/FMA4) via intrinsics. https://en.wikipedia.org/wiki/Elbrus_2000 closes https://github.com/official-stockfish/Stockfish/pull/3425 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 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: Tue May 11 19:41:44 2021 +0200 Timestamp: 1620754904 Remove coordination between searching threads In summary, this revert #2204, as it seems not to bring any strength anymore, so it's no long needed. STC (5+0.05 @ 8 threads): LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 105728 W: 6406 L: 6393 D: 92929 Elo +0.04 Ptnml(0-2): 154, 5479, 41599, 5464, 168 https://tests.stockfishchess.org/tests/view/6096994095e7f1852abd3154 LTC (20+0.2 @ 8 threads): LLR: 2.96 (-2.94,2.94) <-2.50,0.50> Total: 26336 W: 774 L: 712 D: 24850 Elo +0.82 Ptnml(0-2): 9, 641, 11810, 695, 13 https://tests.stockfishchess.org/tests/view/6097c62995e7f1852abd31e8 closes https://github.com/official-stockfish/Stockfish/pull/3459 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 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: Tue May 11 19:37:39 2021 +0200 Timestamp: 1620754659 Simplify LMR as it seems not to bring any strength and thus is no longer needed. Tests for updating elo estimates: https://tests.stockfishchess.org/tests/view/6099ff123a33eb67a844f789 https://tests.stockfishchess.org/tests/view/60953e6695e7f1852abd305b Individual simplification tests: https://tests.stockfishchess.org/tests/view/6098cfc73a33eb67a844f6a1 https://tests.stockfishchess.org/tests/view/6095539495e7f1852abd308b LTC: LLR: 2.93 (-2.94,2.94) <-2.50,0.50> Total: 96984 W: 3624 L: 3608 D: 89752 Elo +0.06 Ptnml(0-2): 45, 3222, 41939, 3244, 42 https://tests.stockfishchess.org/tests/view/6099921a3a33eb67a844f74f closes https://github.com/official-stockfish/Stockfish/pull/3458 bench: 3836428 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: Tomasz Sobczyk
Date: Tue May 11 19:36:11 2021 +0200 Timestamp: 1620754571 Exporting the currently loaded network file This PR adds an ability to export any currently loaded network. The export_net command now takes an optional filename parameter. If the loaded net is not the embedded net the filename parameter is required. Two changes were required to support this: * the "architecture" string, which is really just a some kind of description in the net, is now saved into netDescription on load and correctly saved on export. * the AffineTransform scrambles weights for some architectures and sparsifies them, such that retrieving the index is hard. This is solved by having a temporary scrambled<->unscrambled index lookup table when loading the network, and the actual index is saved for each individual weight that makes it to canSaturate16. This increases the size of the canSaturate16 entries by 6 bytes. closes https://github.com/official-stockfish/Stockfish/pull/3456 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Vizvezdenec
Date: Fri May 7 09:47:17 2021 +0200 Timestamp: 1620373637 Cleanup of likelyFailLow logic This patch broadens and simplifies definition of PvNode that is likely to fail low. New definition can be described as following "If node was already researched at depth >= current depth and failed low there" which is more logical than the previous version and takes less space + allows to not recompute it every time during move loop. Passed simplification STC https://tests.stockfishchess.org/tests/view/609148bf95e7f1852abd2e82 LLR: 2.93 (-2.94,2.94) <-2.50,0.50> Total: 20128 W: 1865 L: 1751 D: 16512 Elo +1.97 Ptnml(0-2): 63, 1334, 7165, 1430, 72 Passed simplification LTC https://tests.stockfishchess.org/tests/view/6091691295e7f1852abd2e8b LLR: 2.94 (-2.94,2.94) <-2.50,0.50> Total: 95128 W: 3498 L: 3481 D: 88149 Elo +0.06 Ptnml(0-2): 41, 2956, 41549, 2981, 37 closes https://github.com/official-stockfish/Stockfish/pull/3455 Bench: 3933037 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: Tomasz Sobczyk
Date: Fri May 7 09:45:08 2021 +0200 Timestamp: 1620373508 Add an UCI level command "export_net". This command writes the embedded net to the file `EvalFileDefaultName`. If there is no embedded net the command does nothing. fixes #3453 closes https://github.com/official-stockfish/Stockfish/pull/3454 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Unai Corzo
Date: Sun May 2 17:48:57 2021 +0200 Timestamp: 1619970537 Simplify check extension Simplify check extension, as it seems not to bring any strength and thus is no longer needed. STC https://tests.stockfishchess.org/tests/view/608c18e995e7f1852abd2b81 LLR: 2.94 (-2.94,2.94) <-2.50,0.50> Total: 54544 W: 4891 L: 4815 D: 44838 Elo +0.48 Ptnml(0-2): 186, 3889, 19081, 3895, 221 LTC https://tests.stockfishchess.org/tests/view/608c6ab195e7f1852abd2bc6 LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 51008 W: 1845 L: 1794 D: 47369 Elo +0.35 Ptnml(0-2): 31, 1591, 22206, 1648, 28 closes https://github.com/official-stockfish/Stockfish/pull/3452 bench: 3993071 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: Sun May 2 17:43:02 2021 +0200 Timestamp: 1619970182 Add some more information on the UCI protocol Improve README.md: provide a link to the protocol, and document some non-standard options. fixes https://github.com/official-stockfish/Stockfish/issues/3446 closes https://github.com/official-stockfish/Stockfish/pull/3450 No functional change see source |