| 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: pb00068
Date: Sat Jun 2 18:02:35 2018 +0200 Timestamp: 1527955355 Extra bonus for capture creating a huge fail high STC: http://tests.stockfishchess.org/tests/view/5b114f3d0ebc596e9e0881f6 LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 13007 W: 2730 L: 2541 D: 7736 Elo +5.05 LTC: http://tests.stockfishchess.org/tests/view/5b1176740ebc59033d2d52c6 LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 15594 W: 2417 L: 2239 D: 10938 Elo +3.97 See https://github.com/official-stockfish/Stockfish/pull/1627 Bench: 4790240 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: Stéphane Nicolet
Date: Sat Jun 2 17:41:37 2018 +0200 Timestamp: 1527954097 Fix comments, rename variables Thanks everybody for the various hints in the perpetual renaming thread: https://github.com/official-stockfish/Stockfish/issues/1426 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: Joost VandeVondele
Date: Sat Jun 2 17:03:01 2018 +0200 Timestamp: 1527951781 Reallocate TT on threadpool resize. Makes sure the potential benefit of first touch does not depend on the order of the UCI commands Threads and Hash, by reallocating the hash if a Threads is issued. The cost is zeroing the TT once more than needed. In case the prefered order (first Threads than Hash) is employed, this amounts to zeroing the default sized TT (16Mb), which is essentially instantaneous. Follow up for https://github.com/official-stockfish/Stockfish/pull/1601 where additional data and discussion is available. Closes https://github.com/official-stockfish/Stockfish/pull/1620 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: Joost VandeVondele
Date: Wed May 30 13:38:11 2018 +0200 Timestamp: 1527680291 Simplify depth reduction in IID. Use a constant reduction instead of a depth dependent reduction. passed STC: http://tests.stockfishchess.org/tests/view/5b06eb600ebc5914abc12ba8 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 58086 W: 11710 L: 11657 D: 34719 Elo +0.32 passed LTC: http://tests.stockfishchess.org/tests/view/5b07b25e0ebc5914abc12c6d LLR: 3.09 (-2.94,2.94) [-3.00,1.00] Total: 110414 W: 16217 L: 16219 D: 77978 Elo -0.01 Bench: 4521056 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: Rodrigo Exterckötter Tjäder
Date: Wed May 30 13:07:18 2018 +0200 Timestamp: 1527678438 Use threads to clear the TT faster. Stockfish currently takes a while to clear the TT when using larger hash sizes. On one machine with 128 GB hash it takes about 50 seconds with a single thread, allowing it to use all allocated cores brought that time down to 4 seconds on some Linux systems. The patch was further tested on Windows and refined with NUMA binding of the hash initializing threads (we refer to pull request #1601 for the complete discussion and the speed measurements). Closes https://github.com/official-stockfish/Stockfish/pull/1601 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: VoyagerOne
Date: Thu May 24 19:06:24 2018 +0200 Timestamp: 1527181584 LMR Capture Tweak Increase capture reduction by comparing opponent's stat score STC: (Yellow) LLR: -2.96 (-2.94,2.94) [0.00,5.00] Total: 92291 W: 18647 L: 18350 D: 55294 Elo +1.12 http://tests.stockfishchess.org/tests/view/5b04225e0ebc5914abc1291b LTC: LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 20176 W: 3061 L: 2868 D: 14247 Elo +3.32 http://tests.stockfishchess.org/tests/view/5b04bb3f0ebc5914abc129a3 How to continue? • we could try a different value for the capture history threeshold Closes https://github.com/official-stockfish/Stockfish/pull/1612 Bench: 5167159 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: Thu May 24 18:46:55 2018 +0200 Timestamp: 1527180415 Simplify BlockedByPawn to one dimension I was able to get this to pass which reduces BlockedByPawn to one dimension with NO distance from edge offset. GOOD) It's more simple and may provide additional clarity for further simplifications. Facilitates migrating unblocked to one dimension as well. BAD) If there is indeed a distance component to BlockedStorm (may or may not be the case), this obfuscates this component into ShelterStrength and UnblockedStorm. This may be more convoluted. Also, it may be more convenient to have each of the three arrays (ShelterStrength, BlockedStorm, and UnBlocked) be the same size. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 96173 W: 19326 L: 19343 D: 57504 Elo -0.06 http://tests.stockfishchess.org/tests/view/5b04544d0ebc5914abc12965 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 49818 W: 7441 L: 7363 D: 35014 Elo +0.54 http://tests.stockfishchess.org/tests/view/5b0487d50ebc5914abc12990 Closes https://github.com/official-stockfish/Stockfish/pull/1611 Bench: 5133208 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 May 24 18:26:34 2018 +0200 Timestamp: 1527179194 Correctly prevent recursive verification in nmp. As discussed with @pb00068, the condition to prevent recursive verification was not completely correct. This patch corrects that condition, and adds an assert. In the current implementation, recursive verification needs to be avoided in order not to break the verification of the move closer to the root (i.e. to not set thisThread->nmp_min_ply to zero prematurely). This patch is tested as a bug fix, based on and tested against PR #1609 . passed STC: http://tests.stockfishchess.org/tests/view/5b050f170ebc5914abc129c5 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 7875 W: 1669 L: 1523 D: 4683 Elo +6.44 passed LTC: http://tests.stockfishchess.org/tests/view/5b0513970ebc5914abc129cd LLR: 3.00 (-2.94,2.94) [-3.00,1.00] Total: 24048 W: 3525 L: 3407 D: 17116 Elo +1.70 Bench changes at high depth. Closes https://github.com/official-stockfish/Stockfish/pull/1610 and https://github.com/official-stockfish/Stockfish/pull/1609 Bench: 4484288 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: Tue May 22 22:43:17 2018 +0200 Timestamp: 1527021797 Simplify color usage in search. define Color us and use this instead of pos.side_to_move() and nmp_odd. The latter allows to clarify the nmp verification criterion. Tested for no regression: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 76713 W: 15303 L: 15284 D: 46126 Elo +0.09 http://tests.stockfishchess.org/tests/view/5b046a0d0ebc5914abc12971 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: VoyagerOne
Date: Tue May 22 07:23:04 2018 +0200 Timestamp: 1526966584 Simply reset StatScore to zero at beta cutoff STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 43154 W: 8706 L: 8625 D: 25823 Elo +0.65 http://tests.stockfishchess.org/tests/view/5b01a7660ebc5914abc1271d LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 48155 W: 7036 L: 6955 D: 34164 Elo +0.58 http://tests.stockfishchess.org/tests/view/5b01b2e50ebc5914abc1272c Closes https://github.com/official-stockfish/Stockfish/pull/1608 Bench: 4484288 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: Mon May 21 09:51:05 2018 +0200 Timestamp: 1526889065 Simplify shelter: always do strength and danger This check of pawns before subtracting danger can be removed. STC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 21174 W: 4361 L: 4239 D: 12574 Elo +2.00 http://tests.stockfishchess.org/tests/view/5b00b9f90ebc5914abc12680 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 56980 W: 8377 L: 8309 D: 40294 Elo +0.41 http://tests.stockfishchess.org/tests/view/5b00ca750ebc5914abc12683 Closes https://github.com/official-stockfish/Stockfish/pull/1607 Bench: 4746692 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: Stéphane Nicolet
Date: Mon May 21 09:37:44 2018 +0200 Timestamp: 1526888264 Simplifying away the progressKey Simplifying away all the progressKey stuff gives exactly the same bench, without any speed impact. Tested for speed against master with two benches at depth 22 ran in parallel: **testedpatch** Total time (ms) : 92350 Nodes searched : 178962949 Nodes/second : 1937877 **master** Total time (ms) : 92358 Nodes searched : 178962949 Nodes/second : 1937709 We also tested the patch at STC for no-regression with [-3, 1] bounds: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 57299 W: 11529 L: 11474 D: 34296 Elo +0.33 http://tests.stockfishchess.org/tests/view/5b015a1c0ebc5914abc126e5 Closes https://github.com/official-stockfish/Stockfish/pull/1603 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: mstembera
Date: Wed May 16 23:40:23 2018 +0200 Timestamp: 1526506823 Fix MSVC errors in tbprobe.cpp Default template parameters values and recursive functions do not play well together. Fix for below errors that showed up after updating to latest MSVC. ```` tbprobe.cpp(1156): error C2672: 'search': no matching overloaded function found tbprobe.cpp(1198): error C2783: 'Tablebases::WDLScore `anonymous-namespace'::search(Position &,Tablebases::ProbeState *)': could not deduce template argument for 'CheckZeroingMoves' ```` Closes https://github.com/official-stockfish/Stockfish/pull/1594 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: Tom Truscott
Date: Wed May 16 22:51:43 2018 +0200 Timestamp: 1526503903 Use cycle detection to bound search value A position which has a move which draws by repetition, or which could have been reached from an earlier position in the game tree, is considered to be at least a draw for the side to move. Cycle detection algorithm by Marcel van Kervink: https://marcelk.net/2013-04-06/paper/upcoming-rep-v2.pdf ---------------------------- How does the algorithm work in practice? The algorithm is an efficient method to detect if the side to move has a drawing move, without doing any move generation, thus possibly giving a cheap cutoffThe most interesting conditions are both on line 1195: ``` if ( originalKey == (progressKey ^ stp->key) || progressKey == Zobrist::side) ``` This uses the position keys as a sort-of Bloom filter, to avoid the expensive checks which follow. For "upcoming repetition" consider the opening Nf3 Nf6 Ng1. The XOR of this position's key with the starting position gives their difference, which can be used to look up black's repeating move (Ng8). But that look-up is expensive, so line 1195 checks that the white pieces are on their original squares. This is the subtlest part of the algorithm, but the basic idea in the above game is there are 4 positions (starting position and the one after each move). An XOR of the first pair (startpos and after Nf3) gives a key matching Nf3. An XOR of the second pair (after Nf6 and after Ng1) gives a key matching the move Ng1. But since the difference in each pair is the location of the white knight those keys are "identical" (not quite because while there are 4 keys the the side to move changed 3 times, so the keys differ by Zobrist::side). The loop containing line 1195 does this pair-wise XOR-ing. Continuing the example, after line 1195 determines that the white pieces are back where they started we still need to make sure the changes in the black pieces represents a legal move. This is done by looking up the "moveKey" to see if it corresponds to possible move, and that there are no pieces blocking its way. There is the additional complication that, to match the behavior of is_draw(), if the repetition is not inside the search tree then there must be an additional repetition in the game history. Since a position can have more than one upcoming repetition a simple count does not suffice. So there is a search loop ending on line 1215. On the other hand, the "no-progress' is the same thing but offset by 1 ply. I like the concept but think it currently has minimal or negative benefit, and I'd be happy to remove it if that would get the patch accepted. This will not, however, save many lines of code. ----------------------------- STC: LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 36430 W: 7446 L: 7150 D: 21834 Elo +2.82 http://tests.stockfishchess.org/tests/view/5afc123f0ebc591fdf408dfc LTC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 12998 W: 2045 L: 1876 D: 9077 Elo +4.52 http://tests.stockfishchess.org/tests/view/5afc2c630ebc591fdf408e0c How could we continue after the patch: • The code in search() that checks for cycles has numerous possible variants. Perhaps the check need could be done in qsearch() too. • The biggest improvement would be to get "no progress" to be of actual benefit, and it would be helpful understand why it (probably) isn't. Perhaps there is an interaction with the transposition table or the (fantastically complex) tree search. Perhaps this would be hard to fix, but there may be a simple oversight. Closes https://github.com/official-stockfish/Stockfish/pull/1575 Bench: 4550412 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: VoyagerOne
Date: Mon May 14 06:52:48 2018 +0200 Timestamp: 1526273568 Update search.cpp At PvNodes allow bonus for prior counter move that caused a fail low for depth 1 and 2. Note : I did a speculative LTC on yellow STC patch since history stats tend to be highly TC sensitive STC (Yellow): LLR: -2.96 (-2.94,2.94) [0.00,5.00] Total: 64295 W: 13042 L: 12873 D: 38380 Elo +0.91 http://tests.stockfishchess.org/tests/view/5af507c80ebc5968e6524153 LTC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 22407 W: 3413 L: 3211 D: 15783 Elo +3.13 http://tests.stockfishchess.org/tests/view/5af85dd40ebc591fdf408b87 Also use local variable excludedMove in NMP (marotear) Bench: 5294316 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: Stéphane Nicolet
Date: Sun May 13 07:20:39 2018 +0200 Timestamp: 1526188839 Tweak kingAttackersCount and KingAttackWeights Use the whole kingRing for pawn attackers instead of only the squares directly around the king. This tends to give quite a lot more kingAttackersCount, so to compensate and to avoid raising the king danger too fast we lower the values in the KingAttackWeights array a little bit. STC: LLR: 2.95 (-2.94,2.94) [0.00,4.00] Total: 51892 W: 10723 L: 10369 D: 30800 Elo +2.37 http://tests.stockfishchess.org/tests/view/5af6d4dd0ebc5968e652428e LTC: LLR: 2.96 (-2.94,2.94) [0.00,4.00] Total: 24536 W: 3737 L: 3515 D: 17284 Elo +3.14 http://tests.stockfishchess.org/tests/view/5af709890ebc5968e65242ac Credits to user @xoroshiro for the idea of using the kingRing for pawn attackers. How to continue? It seems that the KingAttackWeights[] array stores values which are quite Elo-sensitive, yet they have not been tuned with SPSA recently. There might be easy Elo points to get there. Closes https://github.com/official-stockfish/Stockfish/pull/1597 Bench: 5282815 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 May 10 23:36:16 2018 +0200 Timestamp: 1525988176 Include all blockers in king danger Simplification: in king danger, include all blockers and not only pinned pieces, since blockers enemy pieces can result in discovered checks which are also bad. STC http://tests.stockfishchess.org/tests/view/5af35f9f0ebc5968e6523fe9 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 145781 W: 29368 L: 29478 D: 86935 Elo -0.26 LTC http://tests.stockfishchess.org/tests/view/5af3cb430ebc5968e652401f LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 76398 W: 11272 L: 11232 D: 53894 Elo +0.18 I also incorrectly scheduled STC with [0,5] which it failed. http://tests.stockfishchess.org/tests/view/5af283c00ebc5968e6523f33 LLR: -2.94 (-2.94,2.94) [0.00,5.00] Total: 12338 W: 2451 L: 2522 D: 7365 Elo -2.00 Closes https://github.com/official-stockfish/Stockfish/pull/1593 bench: 4698290 ---------------------------------------- Thanks to @vondele and @Rocky640 for a cleaner version of the patch, and the following comments! > Most of the pinned, (or for this pull request, blocking) squares were > already computed in the unsafeChecks, the only missing squares being: > > a) squares attacked by a Queen which are occupied by friendly piece > or "unsafe". Note that adding such squares never passed SPRT[0,5]. > > b) squares not in mobilityArea[Us]. > > There is a strong relationship between the blockers and the unsafeChecks, > but the bitboard unsafeChecks is still useful when the checker is not > aligned with the king, and the checking square is occupied by friendly > piece or is "unsafe". This is always the case for the Knight. 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: Thu May 10 15:46:32 2018 +0200 Timestamp: 1525959992 Consolidate pawn storm types Simplification: the Unopposed and Unblocked pawn storm types are mathematically similar enough to combine with no Elo loss. This reduces the pawn storm types to BlockedByPawn and UnBlocked. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 116869 W: 23549 L: 23605 D: 69715 Elo -0.17 http://tests.stockfishchess.org/tests/view/5af2def90ebc5968e6523f82 LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 39912 W: 6090 L: 5998 D: 27824 Elo +0.80 http://tests.stockfishchess.org/tests/view/5af3b2e20ebc5968e6524013 Closes https://github.com/official-stockfish/Stockfish/pull/1592 Bench: 5244314 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: Thu May 10 12:28:18 2018 +0200 Timestamp: 1525948098 Tune null move pruning Use a lower stat score threshold of 22500. Failed yellow at STC after many games (~0.92 Elo): LLR: -2.96 (-2.94,2.94) [0.00,4.00] Total: 73978 W: 14947 L: 14834 D: 44197 Elo +0.53 http://tests.stockfishchess.org/tests/view/5af2deec0ebc5968e6523f80 But scales good and passed LTC: LLR: 2.96 (-2.94,2.94) [0.00,4.00] Total: 23147 W: 3453 L: 3237 D: 16457 Elo +3.24 http://tests.stockfishchess.org/tests/view/5af3cf820ebc5968e6524022 Closes https://github.com/official-stockfish/Stockfish/pull/1591 Bench: 4777674 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: candirufish
Date: Wed May 9 09:22:11 2018 +0200 Timestamp: 1525850531 Tuned some pawns and evaluation constants Tuned values in pawns.cpp and evaluate.cpp after a SPSA session: 419k games 60sec 600nodetime. We have adjusted the PassedRank[] output of the SPSA session to keep increasing values with rank, and PassedFile[] output to keep the West <–> East symmetry of the evaluation. STC: LLR: 2.95 (-2.94,2.94) [0.00,4.00] Total: 58948 W: 12431 L: 12046 D: 34471 Elo +2.27 http://tests.stockfishchess.org/tests/view/5af2302f0ebc5968e6523f0a LTC: LLR: 2.96 (-2.94,2.94) [0.00,4.00] Total: 22211 W: 3468 L: 3251 D: 15492 Elo +3.39 http://tests.stockfishchess.org/tests/view/5af264c80ebc5968e6523f1a See https://github.com/official-stockfish/Stockfish/pull/1587 and https://github.com/official-stockfish/Stockfish/pull/1590 bench: 4437531 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: Wed May 9 01:42:34 2018 +0200 Timestamp: 1525822954 Remove goto, limit skipping to NMP This patch simplifies the control flow in search(), removing an if and a goto. A side effect of the patch is that Stockfish is now a little bit more selective at low depths, because we allow razoring, futility pruning and probcut pruning after a null move. passed STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 32035 W: 6523 L: 6422 D: 19090 Elo +1.10 http://tests.stockfishchess.org/tests/view/5af142ca0ebc597fb3d39bb6 passed LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 41431 W: 6187 L: 6097 D: 29147 Elo +0.75 http://tests.stockfishchess.org/tests/view/5af148770ebc597fb3d39bc1 Ideas for further work: • Use the nodes credit opened by the patch (the increased selectivity) to try somewhat higher razoring, futility or probcut margins at [0..4]. Bench: 4855031 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 May 8 23:31:55 2018 +0200 Timestamp: 1525815115 Tweak null move pruning conditions Allow null move pruning only if last stat score < 30000. Passed STC: LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 12653 W: 2641 L: 2454 D: 7558 Elo +5.14 http://tests.stockfishchess.org/tests/view/5af1d8830ebc5968e6523edb Passed LTC: LLR: 2.97 (-2.94,2.94) [0.00,5.00] Total: 19782 W: 3072 L: 2878 D: 13832 Elo +3.41 http://tests.stockfishchess.org/tests/view/5af1ee8c0ebc5968e6523ee4 Ideas for further work: • Tune the stat score threshold. • Try depth based stat score threshold. • Try stat score condition for other prunings. Closes https://github.com/official-stockfish/Stockfish/pull/1589 Bench: 5088156 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: Alain SAVARD
Date: Tue May 8 11:14:43 2018 +0200 Timestamp: 1525770883 Drop the lever condition for backwards We can view the patch version as adding some "undermining bonus" for level pawns, when the defending side can not easily avoid the exchange by advancing her pawn. • Case 1) White b2,c3, Black a3,b3: Black is breaking through, b2 deserves a penalty • Case 2) White b2,c3, Black a3,c4: if b2xa3 then White ends up with a weak pawn on a3 and probably a weak pawn on c3 too. In either case, White can still not safely play b2-b3 and make a phalanx with c3, which is the essence of a backward pawn definition. Passed STC in SPRT[0, 4]: LLR: -2.96 (-2.94,2.94) [0.00,4.00] Total: 131169 W: 26523 L: 26199 D: 78447 Elo +0.86 http://tests.stockfishchess.org/tests/view/5aefa4d50ebc5902a409a151 ELO 1.19 [-0.38,2.88] (95%) Passed LTC in SPRT[-3, 1]: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 24824 W: 3732 L: 3617 D: 17475 Elo +1.61 http://tests.stockfishchess.org/tests/view/5af04d3f0ebc5902a88b2e55 ELO 1.27 [-1.21,3.70] (95%) Closes https://github.com/official-stockfish/Stockfish/pull/1584 How to continue from there? There were some promising tests a couple of months ago about adding a lever condition for king danger in evaluate.cpp, maybe it would be time to re-try this after all the recent changes in pawns.cpp Bench: 4773882 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: Tue May 8 10:43:56 2018 +0200 Timestamp: 1525769036 Remove skipEarlyPruning argument to search() Remove nine boolean arguments and the corresponding skipEarlyPruning variable. Instead, skip early pruning only when there is an excluded move, and try null move pruning only if the previous move was not itself a null move. passed STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 33623 W: 6853 L: 6755 D: 20015 Elo +1.01 http://tests.stockfishchess.org/tests/view/5aef462a0ebc5902a409a10e passed LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 39474 W: 5882 L: 5789 D: 27803 Elo +0.82 http://tests.stockfishchess.org/tests/view/5aefd4b80ebc5902a409a164 Closes https://github.com/official-stockfish/Stockfish/pull/1585 Bench: 4953556 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: Tue May 8 10:32:23 2018 +0200 Timestamp: 1525768343 Improve signature script Catch case of missing bench, indicative of a crash or assert. No functional change see source |