| 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: mstembera
Date: Mon Dec 14 07:46:15 2020 +0100 Timestamp: 1607928375 AVX512, AVX2 and SSSE3 speedups Improves throughput by summing 2 intermediate dot products using 16 bit addition before upconverting to 32 bit. Potential saturation is detected and the code-path is avoided in this case. The saturation can't happen with the current nets, but nets can be constructed that trigger this check. STC https://tests.stockfishchess.org/tests/view/5fd40a861ac1691201888479 LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 25544 W: 2451 L: 2296 D: 20797 Elo +2.11 Ptnml(0-2): 92, 1761, 8925, 1888, 106 about 5% speedup closes https://github.com/official-stockfish/Stockfish/pull/3261 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: FauziAkram
Date: Sat Dec 12 09:31:28 2020 +0100 Timestamp: 1607761888 New Imbalance Tables Tweak Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value. The idea started from Fisherman, which requested my help to tune the values back in June/July, so I tuned the values back then, and we were able to accomplish good results, but not enough to pass both STC and LTC tests. So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt. A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better. Passed STC: LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 115976 W: 23124 L: 22695 D: 70157 Elo +1.29 Ptnml(0-2): 2074, 13652, 26285, 13725, 2252 https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8 Passed LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 156304 W: 20617 L: 20024 D: 115663 Elo +1.32 Ptnml(0-2): 1138, 14647, 46084, 15050, 1233 https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e closes https://github.com/official-stockfish/Stockfish/pull/3255 Bench: 4278746 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: Sat Dec 12 09:20:15 2020 +0100 Timestamp: 1607761215 Use arithmetic right shift for sign extension in MMX and SSE2 paths This appears to be slightly faster than using a comparison against zero to compute the high bits, on both old (like Pentium III) and new (like Zen 2) hardware. closes https://github.com/official-stockfish/Stockfish/pull/3254 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 Dec 5 16:58:42 2020 +0100 Timestamp: 1607183922 Add comments to uncommented parts of code https://github.com/official-stockfish/Stockfish/pull/3250 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 Dec 5 16:48:33 2020 +0100 Timestamp: 1607183313 Introduce static history The idea of this patch can be described as following: we update static history stats based on comparison of the static evaluations of the position before and after the move. If the move increases static evaluation it's assigned positive bonus, if it decreases static evaluation it's assigned negative bonus. These stats are used in movepicker to sort quiet moves. passed STC https://tests.stockfishchess.org/tests/view/5fca4c0842a050a89f02cd66 LLR: 3.00 (-2.94,2.94) {-0.25,1.25} Total: 78152 W: 7409 L: 7171 D: 63572 Elo +1.06 Ptnml(0-2): 303, 5695, 26873, 5871, 334 passed LTC https://tests.stockfishchess.org/tests/view/5fca6be442a050a89f02cd75 LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 40240 W: 1602 L: 1441 D: 37197 Elo +1.39 Ptnml(0-2): 19, 1306, 17305, 1475, 15 closes https://github.com/official-stockfish/Stockfish/pull/3253 bench 3845156 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: SFisGOD
Date: Sun Nov 29 16:54:06 2020 +0100 Timestamp: 1606665246 Update default net to nn-62ef826d1a6d.nnue Include scaling change as suggested by Dietrich Kappe, the one who trained net for Komodo. According to him, some nets may require different scaling in order to utilize its full strength. STC: LLR: 2.93 (-2.94,2.94) {-0.25,1.25} Total: 99856 W: 9669 L: 9401 D: 80786 Elo +0.93 Ptnml(0-2): 374, 7468, 34037, 7614, 435 https://tests.stockfishchess.org/tests/view/5fc2697642a050a89f02c8ec LTC: LLR: 2.96 (-2.94,2.94) {0.25,1.25} Total: 29840 W: 1220 L: 1081 D: 27539 Elo +1.62 Ptnml(0-2): 10, 969, 12827, 1100, 14 https://tests.stockfishchess.org/tests/view/5fc2ea5142a050a89f02c957 Bench: 3561701 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 Nov 29 16:52:51 2020 +0100 Timestamp: 1606665171 Reductions simplification Simplify increase reduction for captures/promotions if late move and at low depth. STC https://tests.stockfishchess.org/tests/view/5fbff65067cbf42301d6b3ae LLR: 2.97 (-2.94,2.94) {-1.25,0.25} Total: 49088 W: 4607 L: 4555 D: 39926 Elo +0.37 Ptnml(0-2): 177, 3615, 16932, 3619, 201 LTC https://tests.stockfishchess.org/tests/view/5fc0902967cbf42301d6b3fc LLR: 2.99 (-2.94,2.94) {-0.75,0.25} Total: 160944 W: 6153 L: 6193 D: 148598 Elo -0.09 Ptnml(0-2): 90, 5525, 69294, 5461, 102 closes https://github.com/official-stockfish/Stockfish/pull/3248 bench: 3834568 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: syzygy1
Date: Sun Nov 29 16:51:01 2020 +0100 Timestamp: 1606665061 Remove piece lists This patch removes the incrementally updated piece lists from the Position object. This has been tried before but always failed. My reasons for trying again are: * 32-bit systems (including phones) are now much less important than they were some years ago (and are absent from fishtest); * NNUE may have made SF less finely tuned to the order in which moves were generated. STC: LLR: 2.94 (-2.94,2.94) {-1.25,0.25} Total: 55272 W: 5260 L: 5216 D: 44796 Elo +0.28 Ptnml(0-2): 208, 4147, 18898, 4159, 224 https://tests.stockfishchess.org/tests/view/5fc2986a42a050a89f02c926 LTC: LLR: 2.96 (-2.94,2.94) {-0.75,0.25} Total: 16600 W: 673 L: 608 D: 15319 Elo +1.36 Ptnml(0-2): 14, 533, 7138, 604, 11 https://tests.stockfishchess.org/tests/view/5fc2f98342a050a89f02c95c closes https://github.com/official-stockfish/Stockfish/pull/3247 Bench: 3940967 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 Nov 29 16:47:00 2020 +0100 Timestamp: 1606664820 Update README.md fix a few typos closes https://github.com/official-stockfish/Stockfish/pull/3245 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 Nov 29 16:42:40 2020 +0100 Timestamp: 1606664560 Search simplification STC https://tests.stockfishchess.org/tests/view/5fc2083942a050a89f02c8bb LLR: 2.93 (-2.94,2.94) {-1.25,0.25} Total: 23200 W: 2251 L: 2160 D: 18789 Elo +1.36 Ptnml(0-2): 86, 1726, 7895, 1797, 96 LTC https://tests.stockfishchess.org/tests/view/5fc22d7b42a050a89f02c8d0 LLR: 2.92 (-2.94,2.94) {-0.75,0.25} Total: 15832 W: 653 L: 590 D: 14589 Elo +1.38 Ptnml(0-2): 7, 521, 6795, 588, 5 closes https://github.com/official-stockfish/Stockfish/pull/3244/files bench: 3827317 Simplify search. 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: lonfom169
Date: Sun Nov 29 16:40:06 2020 +0100 Timestamp: 1606664406 Remove bonus for killers. Passed non-regression STC: LLR: 2.94 (-2.94,2.94) {-1.25,0.25} Total: 14712 W: 1416 L: 1315 D: 11981 Elo +2.39 Ptnml(0-2): 59, 1029, 5082, 1124, 62 https://tests.stockfishchess.org/tests/view/5fbfa31f67cbf42301d6b36e Passed non-regression LTC: LLR: 2.95 (-2.94,2.94) {-0.75,0.25} Total: 27536 W: 1099 L: 1044 D: 25393 Elo +0.69 Ptnml(0-2): 11, 929, 11838, 974, 16 https://tests.stockfishchess.org/tests/view/5fbfac9167cbf42301d6b371 closes https://github.com/official-stockfish/Stockfish/pull/3241 Bench: 3887644 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: Lolligerhans
Date: Sun Nov 29 16:38:03 2020 +0100 Timestamp: 1606664283 Refine rook penalty on closed files +-----------------+ | . . . . . . . . | All files are closed. Some files are | . . . . . o o . | more valuable for rooks, because | . . . . o . . o | they might open in the future. | . . . o x . . x | | o . o x . x x . | | x o x . . . . . | x our pawns | . x . . . . . . | o their pawns | . . . . . . . . | ^ rooks are scored higher on these files +-----------------+ ^ ^ Files containing none of our own pawns are open or half-open (otherwise they are closed). Rooks on (half-)open files recieve a bonus for the future potential to act along all ranks. This commit refines the (relative) penalty of rooks on closed files. Files that contain one of our blocked pawns are considered less likely to open in the future; rooks on these files are now penalized stronger. This bonus does not generally correlate with mobility. If the condition is sufficiently refined in the future, it may be beneficial to adjust or override mobility scores in some cases. LTC LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 494384 W: 71565 L: 70231 D: 352588 Elo +0.94 Ptnml(0-2): 3907, 48050, 142118, 49036, 4081 https://tests.stockfishchess.org/tests/view/5fb9312e67cbf42301d6afb9 LTC (non-regression w/ book noob_3moves.epd) LLR: 2.95 (-2.94,2.94) {-0.75,0.25} Total: 208520 W: 27044 L: 26937 D: 154539 Elo +0.18 Ptnml(0-2): 1557, 19850, 61391, 19853, 1609 https://tests.stockfishchess.org/tests/view/5fc01ced67cbf42301d6b3df STC LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 98392 W: 20269 L: 19868 D: 58255 Elo +1.42 Ptnml(0-2): 1804, 11297, 22589, 11706, 1800 https://tests.stockfishchess.org/tests/view/5fb7f88a67cbf42301d6af10 closes https://github.com/official-stockfish/Stockfish/pull/3242 Bench: 3682630 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: mstembera
Date: Sun Nov 29 16:36:49 2020 +0100 Timestamp: 1606664209 Cleaned up MakeIndex() The index order in kpp_board_index[][] is reversed to be more optimal for the access pattern STC https://tests.stockfishchess.org/tests/view/5fbd74f967cbf42301d6b24f LLR: 2.93 (-2.94,2.94) {-1.25,0.25} Total: 27504 W: 2686 L: 2607 D: 22211 Elo +1.00 Ptnml(0-2): 84, 2001, 9526, 2034, 107 closes https://github.com/official-stockfish/Stockfish/pull/3233 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: Thu Nov 26 08:20:06 2020 +0100 Timestamp: 1606375206 use classical for certain endgames. STC https://tests.stockfishchess.org/tests/view/5fbc64c067cbf42301d6b1d6 LLR: 2.97 (-2.94,2.94) {-0.25,1.25} Total: 53360 W: 5223 L: 5024 D: 43113 Elo +1.30 Ptnml(0-2): 184, 3877, 18390, 4014, 215 LTC https://tests.stockfishchess.org/tests/view/5fbc97f267cbf42301d6b1ee LLR: 2.96 (-2.94,2.94) {0.25,1.25} Total: 126472 W: 5111 L: 4766 D: 116595 Elo +0.95 Ptnml(0-2): 50, 4032, 54749, 4333, 72 closes https://github.com/official-stockfish/Stockfish/pull/3240 bench: 3820648 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: MaximMolchanov
Date: Wed Nov 25 21:10:13 2020 +0100 Timestamp: 1606335013 Calculate sum from first elements in affine transform for AVX512/AVX2/SSSE3 The idea is to initialize sum with the first element instead of zero. Reduce one add_epi32 and one set_zero SIMD instructions for each output dimension. sum = 0; for i = 1 to n sum += a[i] -> sum = a[1]; for i = 2 to n sum += a[i] STC: LLR: 2.95 (-2.94,2.94) {-0.25,1.25} Total: 69048 W: 7024 L: 6799 D: 55225 Elo +1.13 Ptnml(0-2): 260, 5175, 23458, 5342, 289 https://tests.stockfishchess.org/tests/view/5faf2cf467cbf42301d6aa06 closes https://github.com/official-stockfish/Stockfish/pull/3227 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: Wed Nov 25 21:05:08 2020 +0100 Timestamp: 1606334708 Assorted search and eval parameter tune Search and eval parameter tune. STC https://tests.stockfishchess.org/tests/view/5fba850a67cbf42301d6b07d LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 24312 W: 2388 L: 2228 D: 19696 Elo +2.29 Ptnml(0-2): 85, 1800, 8241, 1930, 100 LTC https://tests.stockfishchess.org/tests/view/5fbad5ea67cbf42301d6b0fa LLR: 2.95 (-2.94,2.94) {0.25,1.25} Total: 88376 W: 3619 L: 3351 D: 81406 Elo +1.05 Ptnml(0-2): 56, 2977, 37849, 3255, 51 closes https://github.com/official-stockfish/Stockfish/pull/3232 bench: 3600361 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 Nov 23 22:20:32 2020 +0100 Timestamp: 1606166432 Small cleanups 13 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: FauziAkram
Date: Sun Nov 15 13:23:19 2020 +0100 Timestamp: 1605442999 Rook Mobility Tweak Passed STC: LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 171152 W: 34715 L: 34202 D: 102235 Elo +1.04 Ptnml(0-2): 3278, 20155, 38228, 20606, 3309 https://tests.stockfishchess.org/tests/view/5fa861f467cbf42301d6a68e Passed LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 149616 W: 20471 L: 19882 D: 109263 Elo +1.37 Ptnml(0-2): 1172, 14434, 43102, 14833, 1267 https://tests.stockfishchess.org/tests/view/5fa9c8ff67cbf42301d6a74f closes https://github.com/official-stockfish/Stockfish/pull/3226 Bench: 3597730 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: SFisGOD
Date: Thu Nov 12 12:49:03 2020 +0100 Timestamp: 1605181743 Increase reduction at root when the best move does not change frequently STC: LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 51320 W: 5159 L: 4956 D: 41205 Elo +1.37 Ptnml(0-2): 215, 3897, 17242, 4082, 224 https://tests.stockfishchess.org/tests/view/5faa072367cbf42301d6a767 LTC: LLR: 2.98 (-2.94,2.94) {0.25,1.25} Total: 15952 W: 762 L: 642 D: 14548 Elo +2.61 Ptnml(0-2): 8, 561, 6725, 667, 15 https://tests.stockfishchess.org/tests/view/5faa4c3567cbf42301d6a794 closes https://github.com/official-stockfish/Stockfish/pull/3225 Bench: 3954692 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: lonfom169
Date: Tue Nov 10 18:21:05 2020 +0100 Timestamp: 1605028865 Increase reduction based on the number of best move changes. Thanks to Vizvezdenec for the PvNode idea and also to vondele the !PvNode idea. Passed STC: LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 19120 W: 1998 L: 1839 D: 15283 Elo +2.89 Ptnml(0-2): 76, 1445, 6375, 1572, 92 https://tests.stockfishchess.org/tests/view/5fa8af3e67cbf42301d6a6c9 Passed LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 75584 W: 3454 L: 3205 D: 68925 Elo +1.14 Ptnml(0-2): 54, 2832, 31771, 3081, 54 closes https://github.com/official-stockfish/Stockfish/pull/3224 Bench: 3595418 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: Sun Nov 8 09:15:34 2020 +0100 Timestamp: 1604823334 Qsearch pruning: follow-up This is a follow-up of the recent qsearch pruning patch in https://github.com/official-stockfish/Stockfish/commit/a260c9a8a24a2630a900efc3821000c3481b0c5d We now use the same guard condition (testing that we already have a defense with a score better score than a TB loss) for all pruning heuristics in qsearch(). This allows some pruning when in check, but in a controlled way to ensure that no wrong mate scores appear. Tested with Elo-gaining bounds: STC: LLR: 2.97 (-2.94,2.94) {-0.25,1.25} Total: 22632 W: 2433 L: 2264 D: 17935 Elo +2.59 Ptnml(0-2): 98, 1744, 7487, 1865, 122 https://tests.stockfishchess.org/tests/view/5fa59405936c54e11ec99515 LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 105432 W: 4965 L: 4648 D: 95819 Elo +1.04 Ptnml(0-2): 85, 4110, 44011, 4423, 87 https://tests.stockfishchess.org/tests/view/5fa5b609936c54e11ec9952a closes https://github.com/official-stockfish/Stockfish/pull/3221 Bench: 3578092 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: SFisGOD
Date: Sun Nov 8 08:36:16 2020 +0100 Timestamp: 1604820976 Update default net to nn-c3ca321c51c9.nnue Optimization of the net biases of the 32 x 32 layer and the output layer. Tuning of 32 x 32 layer (200k games, 5 seconds TC) https://tests.stockfishchess.org/tests/view/5f9aaf266a2c112b60691c68 STC: LLR: 2.95 (-2.94,2.94) {-0.25,1.25} Total: 41848 W: 4665 L: 4461 D: 32722 Elo +1.69 Ptnml(0-2): 239, 3308, 13659, 3446, 272 https://tests.stockfishchess.org/tests/view/5fa5ef5a936c54e11ec9954f LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 88008 W: 4045 L: 3768 D: 80195 Elo +1.09 Ptnml(0-2): 69, 3339, 36908, 3622, 66 https://tests.stockfishchess.org/tests/view/5fa62a78936c54e11ec99577 closes https://github.com/official-stockfish/Stockfish/pull/3220 Bench: 3649288 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: Sat Nov 7 16:49:49 2020 +0100 Timestamp: 1604764189 AVX-512 for smaller affine and feature transforms. For the feature transformer the code is analogical to AVX2 since there was room for easy adaptation of wider simd registers. For the smaller affine transforms that have 32 byte stride we keep 2 columns in one zmm register. We also unroll more aggressively so that in the end we have to do 16 parallel horizontal additions on ymm slices each consisting of 4 32-bit integers. The slices are embedded in 8 zmm registers. These changes provide about 1.5% speedup for AVX-512 builds. Closes https://github.com/official-stockfish/Stockfish/pull/3218 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: FauziAkram
Date: Sat Nov 7 16:49:49 2020 +0100 Timestamp: 1604764189 Introducing King On File this new concept calculates bonuses/penalties for the king when the king is in a semiopen or open file. Passed STC: LLR: 2.95 (-2.94,2.94) {-0.25,1.25} Total: 44904 W: 9365 L: 9028 D: 26511 Elo +2.61 Ptnml(0-2): 857, 5309, 9841, 5530, 915 https://tests.stockfishchess.org/tests/view/5fa343625d72639a7acef72b Passed LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 60552 W: 8449 L: 8051 D: 44052 Elo +2.28 Ptnml(0-2): 466, 5772, 17481, 6012, 545 https://tests.stockfishchess.org/tests/view/5fa40e365d72639a7acef79e closes https://github.com/official-stockfish/Stockfish/pull/3219 Bench: 3689484 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 Nov 7 16:48:02 2020 +0100 Timestamp: 1604764082 Change handling the special case of a single legal move. Using no searching time in case of a single legal move is not beneficial from a strength point of view, and this special case can be easily removed: STC: LLR: 2.93 (-2.94,2.94) {-1.25,0.25} Total: 22472 W: 2458 L: 2357 D: 17657 Elo +1.56 Ptnml(0-2): 106, 1733, 7453, 1842, 102 https://tests.stockfishchess.org/tests/view/5f926cbc81eda81bd78cb6df LTC: LLR: 2.94 (-2.94,2.94) {-0.75,0.25} Total: 37880 W: 1736 L: 1682 D: 34462 Elo +0.50 Ptnml(0-2): 22, 1392, 16057, 1448, 21 https://tests.stockfishchess.org/tests/view/5f92a26081eda81bd78cb6fe The advantage of using the normal time management for a single legal move is that scores reported for that move are reasonable, not searching leads to artifacts during games (see e.g. https://tcec-chess.com/#div=sf&game=96&season=19) The disadvantage of using normal time management of a single legal move is that thinking times can be unnaturally long, making it 'painful to watch' in online tournaments. This patch uses normal time management, but caps the used time to 500ms. This should lead to reasonable scores, and be hardly perceptible. closes https://github.com/official-stockfish/Stockfish/pull/3195 closes https://github.com/official-stockfish/Stockfish/pull/3183 variant of a patch suggested by SFisGOD No functional change. see source |