| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Wed Apr 29 17:44:24 2020 +0200 Timestamp: 1588175064 Small cleanups closes https://github.com/official-stockfish/Stockfish/pull/2628 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Wed Apr 29 17:35:48 2020 +0200 Timestamp: 1588174548 Introduce futility pruning for captures The idea is somewhat similar to futility pruning for quiet moves - if a late enough capture doesn't give check and the static eval is much lower than alpha we can almost safely assume that this capture wouldn't be a good move. passed STC https://tests.stockfishchess.org/tests/view/5ea8544b53a4548a0348ee5b LLR: 2.95 (-2.94,2.94) {-0.50,1.50} Total: 236040 W: 44420 L: 43894 D: 147726 Elo +0.77 Ptnml(0-2): 3830, 27202, 55496, 27596, 3896 passed LTC https://tests.stockfishchess.org/tests/view/5ea87c842141237a731f0c7d LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 81336 W: 10429 L: 10028 D: 60879 Elo +1.71 Ptnml(0-2): 589, 7356, 24404, 7703, 616 closes https://github.com/official-stockfish/Stockfish/pull/2651 bench 4405247 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: pb00067
Date: Wed Apr 22 08:48:01 2020 +0200 Timestamp: 1587538081 continuation histories when in check If in check, don't write to continuation histories ss-4, ss-6. Adding inCheck to the stack was needed, and might be useful for future patches. Passed STC: https://tests.stockfishchess.org/tests/view/5e9ee24acaaff5d60a50b812 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 61774 W: 11725 L: 11449 D: 38600 Elo +1.55 Ptnml(0-2): 971, 7211, 14322, 7337, 1046 Passed LTC: https://tests.stockfishchess.org/tests/view/5e9eecb7caaff5d60a50b831 LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 250822 W: 32067 L: 31179 D: 187576 Elo +1.23 Ptnml(0-2): 1745, 23126, 74824, 23928, 1788 closes https://github.com/official-stockfish/Stockfish/pull/2645 bench: 4808463 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Sat Apr 18 15:36:41 2020 +0200 Timestamp: 1587217001 Apply multicut pruning more often This patch increases number of nodes where we produce multicut cutoffs. The idea is that if our ttMove failed to produce a singular extension but ttValue is greater than beta we can afford to do one more reduced search near beta excluding ttMove to see if it will produce a fail high - and if it does so produce muticut by analogy to existing logic. passed STC https://tests.stockfishchess.org/tests/view/5e9a162b5b664cdba0ce6e28 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 58238 W: 11192 L: 10917 D: 36129 Elo +1.64 Ptnml(0-2): 1007, 6704, 13442, 6939, 1027 passed LTC https://tests.stockfishchess.org/tests/view/5e9a1e845b664cdba0ce7411 LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 137852 W: 17460 L: 16899 D: 103493 Elo +1.41 Ptnml(0-2): 916, 12610, 41383, 13031, 986 closes https://github.com/official-stockfish/Stockfish/pull/2640 bench 4881443 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sat Apr 18 15:29:24 2020 +0200 Timestamp: 1587216564 Simplify minPawnDistance This is a functional simplification which fixes an awkward numerical cliff. With master king_safety, no pawns is scored higher than pawn(s) that is/are far from the king. This may motivate SF to throw away pawns to increase king safety. With this patch, there is a consistent value for minPawnDistance where losing a pawn never increases king safety. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 45548 W: 8624 L: 8525 D: 28399 Elo +0.76 Ptnml(0-2): 592, 4937, 11587, 5096, 562 https://tests.stockfishchess.org/tests/view/5e98ced630be947a14e9ddc5 LTC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 42084 W: 5292 L: 5242 D: 31550 Elo +0.41 Ptnml(0-2): 193, 3703, 13252, 3649, 245 https://tests.stockfishchess.org/tests/view/5e98e22e30be947a14e9de07 closes https://github.com/official-stockfish/Stockfish/pull/2639 bench 4600292 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Thu Apr 16 21:44:52 2020 +0200 Timestamp: 1587066292 Remove one condition in probcut TTmove skipping the removed condition appears illogical and is not needed. passed STC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 80418 W: 15217 L: 15144 D: 50057 Elo +0.32 Ptnml(0-2): 1341, 9399, 18679, 9426, 1364 https://tests.stockfishchess.org/tests/view/5e977eb5c9ada107a0370d6b passed LTC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 49878 W: 6299 L: 6247 D: 37332 Elo +0.36 Ptnml(0-2): 327, 4677, 14897, 4693, 345 https://tests.stockfishchess.org/tests/view/5e97e07dc9ada107a0370e53 closes https://github.com/official-stockfish/Stockfish/pull/2638 Bench: 4958027 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: xoto10
Date: Thu Apr 16 21:40:06 2020 +0200 Timestamp: 1587066006 Scale factor in opposite-color bishop endings This change varies the scale factor with the total number of pieces and pawns on the strongSide. STC : LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 150920 W: 28828 L: 28422 D: 93670 Elo +0.93 Ptnml(0-2): 2507, 17548, 35030, 17782, 2593 https://tests.stockfishchess.org/tests/view/5e983eb2c00499c5410f4951 LTC : LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 69238 W: 8810 L: 8446 D: 51982 Elo +1.83 Ptnml(0-2): 451, 6276, 20879, 6484, 529 https://tests.stockfishchess.org/tests/view/5e985b27c00499c5410f4987 closes https://github.com/official-stockfish/Stockfish/pull/2637 Bench 4821332 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Lolligerhans
Date: Thu Apr 16 21:36:19 2020 +0200 Timestamp: 1587065779 Increase safe check bonus if multiple safe checks Add 50% "safe checks" bonus when there are multiple safe checks from the same piece type. LTC LLR: 2.97 (-2.94,2.94) {0.25,1.75} Total: 128184 W: 16491 L: 15954 D: 95739 Elo +1.46 Ptnml(0-2): 884, 11793, 38267, 12198, 950 https://tests.stockfishchess.org/tests/view/5e97d1b6c9ada107a0370e03 STC LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 19022 W: 3733 L: 3514 D: 11775 Elo +4.00 Ptnml(0-2): 338, 2103, 4414, 2314, 342 https://tests.stockfishchess.org/tests/view/5e97c377c9ada107a0370ddf closes https://github.com/official-stockfish/Stockfish/pull/2636 Bench: 5057329 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: FauziAkram
Date: Thu Apr 16 21:32:26 2020 +0200 Timestamp: 1587065546 Queen and Rook Tuning Tuning for multiple parameters for Queen and Rook. passed STC LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 62790 W: 12033 L: 11754 D: 39003 Elo +1.54 Ptnml(0-2): 1058, 7186, 14666, 7389, 1096 https://tests.stockfishchess.org/tests/view/5e978c66c9ada107a0370d87 passed LTC LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 89780 W: 11460 L: 11036 D: 67284 Elo +1.64 Ptnml(0-2): 624, 8151, 26951, 8505, 659 https://tests.stockfishchess.org/tests/view/5e979aaec9ada107a0370d93 closes https://github.com/official-stockfish/Stockfish/pull/2634 Bench: 5111578 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Wed Apr 15 20:33:03 2020 +0200 Timestamp: 1586975583 Don't attempt probcut if ttMove is not good enough. This idea is loosely based on xoroshiro idea about raisedBeta and ttmoves. If our ttmove have low enough ttvalue and is deep enough (deeper than our probcut depth) it makes little sense to try probcut moves, since the ttMove already more or less failed to produce one according to transposition table. passed STC https://tests.stockfishchess.org/tests/view/5e9673ddc2718dee3c822920 LLR: 2.95 (-2.94,2.94) {-0.50,1.50} Total: 72148 W: 14038 L: 13741 D: 44369 Elo +1.43 Ptnml(0-2): 1274, 8326, 16615, 8547, 1312 passed LTC https://tests.stockfishchess.org/tests/view/5e96b378c2718dee3c8229bf LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 89054 W: 11418 L: 10996 D: 66640 Elo +1.65 Ptnml(0-2): 623, 8113, 26643, 8515, 633 closes https://github.com/official-stockfish/Stockfish/pull/2632 bench 4952731 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Wed Apr 15 08:29:20 2020 +0200 Timestamp: 1586932160 Space bonus and number of blocked pawns This patch refines the recently introduced interaction between the space bonus and the number of blocked pawns in a position. * pawns count as blocked also if their push square is attacked by 2 enemy pawns; * overall dependence is stronger as well as offset; * bonus increase is capped at 9 blocked pawns in position; passed STC https://tests.stockfishchess.org/tests/view/5e94560663d105aebbab243d LLR: 2.96 (-2.94,2.94) {-0.50,1.50} Total: 29500 W: 5842 L: 5603 D: 18055 Elo +2.81 Ptnml(0-2): 504, 3443, 6677, 3562, 564 passed LTC https://tests.stockfishchess.org/tests/view/5e95b383c2aaa99f75d1a14d LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 63504 W: 8329 L: 7974 D: 47201 Elo +1.94 Ptnml(0-2): 492, 5848, 18720, 6197, 495 closes https://github.com/official-stockfish/Stockfish/pull/2631 bench 4956028 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stefan Geschwentner
Date: Tue Apr 14 08:01:53 2020 +0200 Timestamp: 1586844113 less bonus for blocked connected pawn Use less bonus for blocked connected pawns so closed positions are less worth. STC: LLR: 2.96 (-2.94,2.94) {-0.50,1.50} Total: 60004 W: 11904 L: 11619 D: 36481 Elo +1.65 Ptnml(0-2): 1066, 7083, 13535, 7136, 1182 https://tests.stockfishchess.org/tests/view/5e941a8063d105aebbab23e3 LTC: LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 36606 W: 4831 L: 4556 D: 27219 Elo +2.61 Ptnml(0-2): 252, 3353, 10872, 3520, 306 https://tests.stockfishchess.org/tests/view/5e9444b963d105aebbab2427 closes https://github.com/official-stockfish/Stockfish/pull/2629 Bench: 4961260 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: silversolver1
Date: Mon Apr 13 09:20:53 2020 +0200 Timestamp: 1586762453 Removes evasionPrunable STC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 25656 W: 4979 L: 4826 D: 15851 Elo +2.07 Ptnml(0-2): 414, 2971, 5964, 3006, 473 https://tests.stockfishchess.org/tests/view/5e93dbd72cb65b3059c33819 LTC: LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 43732 W: 5656 L: 5593 D: 32483 Elo +0.50 Ptnml(0-2): 324, 4072, 13009, 4139, 322 https://tests.stockfishchess.org/tests/view/5e93e37c2cb65b3059c33825 closes https://github.com/official-stockfish/Stockfish/pull/2627 Bench: 4702195 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Mon Apr 13 09:16:54 2020 +0200 Timestamp: 1586762214 Scale up space weight with number of blocked pawns This idea is loosely based on stockfish losses in closed positions in different tournaments. Space weight symmetrically increases for both sides the more blocked position is. passed STC https://tests.stockfishchess.org/tests/view/5e919eefaf0a0143109dc8ce LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 16994 W: 3389 L: 3172 D: 10433 Elo +4.44 Ptnml(0-2): 277, 1931, 3918, 2040, 331 passed LTC https://tests.stockfishchess.org/tests/view/5e91d04faf0a0143109dc8ea LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 133386 W: 17316 L: 16763 D: 99307 Elo +1.44 Ptnml(0-2): 945, 12407, 39524, 12784, 1033 closes https://github.com/official-stockfish/Stockfish/pull/2626 Bench: 4966867 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Lolligerhans
Date: Mon Apr 13 08:50:25 2020 +0200 Timestamp: 1586760625 Remove candidate passers w/o feasible lever +-------+ | o . . | o their pawns | x . . | x our pawns | . x . | <- Can sacrifice to create passer? +-------+ yes 1 2 3 4 5 +-------+ +-------+ +-------+ +-------+ +-------+ | o . . | | o r . | | o r . | | o . b | | o . b | lowercase: theirs | x b . | | x . . | | x . R | | x . R | | x . . | uppercase: ours | . x . | | . x . | | . x . | | . x . | | . x B | +-------+ +-------+ +-------+ +-------+ +-------+ no no yes no yes The value of our top pawn depends on our ability to advance our bottom pawn, levering their blocker. Previously, this pawn configuration was always scored as passer (although a blocked one). Add requirements for the square s above our (possibly) sacrificed pawn: - s must not be occupied by them (1). - If they attack s (2), we must attack s (3). - If they attack s with a minor (4), we must attack s with a minor (5). The attack from their blocker is ignored because it is inherent in the structure; we are ok with sacrificing our bottom pawn. LTC LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 37030 W: 4962 L: 4682 D: 27386 Elo +2.63 Ptnml(0-2): 266, 3445, 10863, 3625, 316 https://tests.stockfishchess.org/tests/view/5e92a2b4be6ede5b954bf239 STC LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 40874 W: 8066 L: 7813 D: 24995 Elo +2.15 Ptnml(0-2): 706, 4753, 9324, 4890, 764 https://tests.stockfishchess.org/tests/view/5e922199af0a0143109dc90e closes https://github.com/official-stockfish/Stockfish/pull/2624 Bench: 4828294 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Sun Apr 12 20:38:47 2020 +0200 Timestamp: 1586716727 Extend irreversible moves if these are ttMoves and played in positions with a high value of the rule50 counter. The unusual extension of 2 is safe in this context as awarding it will reset the rule50 counter, making sure it is awarded very rarely in a search path. This patch partially addresses https://github.com/official-stockfish/Stockfish/issues/2620 as it should make it less likely to play a move that resets the counter, but that is worse than alternative moves after a slightly deeper search. passed STC: LLR: 2.96 (-2.94,2.94) {-0.50,1.50} Total: 71658 W: 13840 L: 13560 D: 44258 Elo +1.36 Ptnml(0-2): 1058, 7921, 17643, 8097, 1110 https://tests.stockfishchess.org/tests/view/5e90d0f6754c3424c4cf9f41 passed LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 85082 W: 11069 L: 10680 D: 63333 Elo +1.59 Ptnml(0-2): 459, 6982, 27259, 7393, 448 https://tests.stockfishchess.org/tests/view/5e917470af0a0143109dc341 closes https://github.com/official-stockfish/Stockfish/pull/2623 Bench: 4432822 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sun Apr 12 20:34:50 2020 +0200 Timestamp: 1586716490 Always remember the ttMove In master, if the received ttMove meets the prescribed conditions in the various MovePicker constructors, it is returned as the first move, otherwise we set it to MOVE_NONE. If set to MOVE_NONE, we no longer track what the ttMove was, and it will might be returned later in a list of generated moves. This may be a waste. With this patch, if the ttMove fails to meet the prescribed conditions, we simply skip the TT stages, but still store the move and make sure it's never returned. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 66424 W: 12903 L: 12806 D: 40715 Elo +0.51 Ptnml(0-2): 1195, 7730, 15230, 7897, 1160 LTC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 45682 W: 5989 L: 5926 D: 33767 Elo +0.48 Ptnml(0-2): 329, 4361, 13443, 4334, 374 closes https://github.com/official-stockfish/Stockfish/pull/2616 Bench 4928928 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Sun Apr 12 20:30:08 2020 +0200 Timestamp: 1586716208 Small cleanups closes https://github.com/official-stockfish/Stockfish/pull/2606 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Tue Apr 7 17:47:01 2020 +0200 Timestamp: 1586274421 Introduce capture history pruning This patch introduces a heuristic that is similar to countermove based pruning but for captures - capture history pruning. The idea is that we can (almost) safely prune really late captures with negative history if they don't give check so will most likely not produce some king-attacking tactic. passed STC https://tests.stockfishchess.org/tests/view/5e8c60d40ffd2be7f15e5470 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 23748 W: 4758 L: 4529 D: 14461 Elo +3.35 Ptnml(0-2): 421, 2712, 5400, 2899, 442 passed LTC https://tests.stockfishchess.org/tests/view/5e8c72bf0ffd2be7f15e547f LLR: 2.96 (-2.94,2.94) {0.25,1.75} Total: 17330 W: 2415 L: 2190 D: 12725 Elo +4.51 Ptnml(0-2): 126, 1561, 5107, 1704, 167 closes https://github.com/official-stockfish/Stockfish/pull/2618 bench 4417023 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Sun Apr 5 08:44:25 2020 +0200 Timestamp: 1586069065 Further increase reductions with increasing number of threads This patch doubles the reduction increase with thread count. passed STC https://tests.stockfishchess.org/tests/view/5e874f5a4411759d9d098696 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 9162 W: 1558 L: 1385 D: 6219 Elo +6.56 Ptnml(0-2): 90, 958, 2343, 1069, 121 passed LTC https://tests.stockfishchess.org/tests/view/5e8762804411759d9d09869f LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 79364 W: 9541 L: 9159 D: 60664 Elo +1.67 Ptnml(0-2): 462, 6880, 24661, 7172, 507 closes https://github.com/official-stockfish/Stockfish/pull/2615 bench 4831963 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: 31m059
Date: Sun Apr 5 08:39:00 2020 +0200 Timestamp: 1586068740 Retire candidate passed pawns Before this commit, some pawns were considered "candidate" passed pawns and given half bonus. After this commit, all of these pawns are scored as passed pawns, and they do not receive less bonus. STC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 21806 W: 4320 L: 4158 D: 13328 Elo +2.58 Ptnml(0-2): 367, 2526, 5001, 2596, 413 https://tests.stockfishchess.org/tests/view/5e86b4724411759d9d098639 LTC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 12590 W: 1734 L: 1617 D: 9239 Elo +3.23 Ptnml(0-2): 96, 1187, 3645, 1238, 129 https://tests.stockfishchess.org/tests/view/5e86d2874411759d9d098640 This PR and commit are dedicated to our colleague Stefan Geschwentner (@locutus2), one of the most respected and accomplished members of the Stockfish developer community. Stockfish is a volunteer project and has always thrived because of Stefan's talent, insight, generosity, and dedication. Welcome back, Stefan! closes https://github.com/official-stockfish/Stockfish/pull/2613 Bench: 4831963 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sun Apr 5 08:35:31 2020 +0200 Timestamp: 1586068531 remove KNPK endgame code In more than 100k local KNPK games, there is no discernible difference between master and master with this endgame removed: master:42971, patch:42973, draws: 3969. Removal does not seem to regress in normal games. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 46390 W: 8998 L: 8884 D: 28508 Elo +0.85 Ptnml(0-2): 707, 5274, 11163, 5300, 751 https://tests.stockfishchess.org/tests/view/5e83b18ee42a5c3b3ca2ef02 LTC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 44768 W: 5863 L: 5814 D: 33091 Elo +0.38 Ptnml(0-2): 251, 3918, 14028, 3905, 282 https://tests.stockfishchess.org/tests/view/5e84a82a4411759d9d0984f4 In tests with a book of endgames that can convert into KNPK, no significant difference can be seen either ``` TC 1.0+0.01 Score of patch vs master: 6131 - 6188 - 27681 [0.499] 40000 Elo difference: -0.5 +/- 1.9, LOS: 30.4 %, DrawRatio: 69.2 % TC 2.0+0.02 Score of patch vs master: 5740 - 5741 - 28519 [0.500] 40000 Elo difference: -0.0 +/- 1.8, LOS: 49.6 %, DrawRatio: 71.3 % `` closes https://github.com/official-stockfish/Stockfish/pull/2611 Bench 4512059 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Thu Apr 2 15:11:16 2020 +0200 Timestamp: 1585833076 Increase reduction for captures. The idea behind this patch is that if static eval is really bad so capturing of current piece on spot will still produce a position with an eval much lower than alpha then our best chance is to create some kind of king attack. So captures without check are mostly worse than captures with check and can be reduced more. passed STC https://tests.stockfishchess.org/tests/view/5e8514b44411759d9d098543 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 46196 W: 9039 L: 8781 D: 28376 Elo +1.94 Ptnml(0-2): 750, 5412, 10628, 5446, 862 passed LTC https://tests.stockfishchess.org/tests/view/5e8530134411759d9d09854c LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 23462 W: 3228 L: 2988 D: 17246 Elo +3.55 Ptnml(0-2): 186, 2125, 6849, 2405, 166 close https://github.com/official-stockfish/Stockfish/pull/2612 bench 4742598 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: 31m059
Date: Thu Apr 2 14:56:30 2020 +0200 Timestamp: 1585832190 Simplify a candidate passer condition. STC: LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 31528 W: 6208 L: 6061 D: 19259 Elo +1.62 Ptnml(0-2): 541, 3673, 7205, 3788, 557 https://tests.stockfishchess.org/tests/view/5e825db0e42a5c3b3ca2ee21 LTC: LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 38546 W: 5083 L: 5009 D: 28454 Elo +0.67 Ptnml(0-2): 299, 3628, 11362, 3668, 316 https://tests.stockfishchess.org/tests/view/5e826ec7e42a5c3b3ca2ee2a closes https://github.com/official-stockfish/Stockfish/pull/2607 Bench: 5139561 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: mstembera
Date: Thu Apr 2 14:54:47 2020 +0200 Timestamp: 1585832087 No voting for TB loss / mate. Just as we pick the shortest mate also make sure we stave off mate as long as possible. https://github.com/official-stockfish/Stockfish/pull/2603 bench: 5138771 see source |