| 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: Jean Gauthier
Date: Wed Aug 21 09:11:17 2019 +0200 Timestamp: 1566371477 Slight speep up fetching the endgame table Replace calls to count(key) + operator[key] with a single call to find(key). Replace the std::map with std::unordered_map which provide O(1) access, although the map has a really small number of objects. Test with [0..4] failed yellow: TC 10+0.1 SPRT elo0: 0.00 alpha: 0.05 elo1: 4.00 beta: 0.05 LLR -2.96 [-2.94,2.94] (rejected) Elo 1.01 [-0.87,3.08] (95%) LOS 85.3% Games 71860 [w:22.3%, l:22.2%, d:55.5%] http://tests.stockfishchess.org/tests/view/5d5432210ebc5925cf109d61 Closes https://github.com/official-stockfish/Stockfish/pull/2269 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: Alain SAVARD
Date: Wed Aug 14 22:15:48 2019 +0200 Timestamp: 1565813748 Assorted trivial cleanups (July 2019) 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: Stefan Geschwentner
Date: Wed Aug 14 20:59:04 2019 +0200 Timestamp: 1565809144 Tweak unsafe checks Remove mobility area for unsafe checks. Also separate the evaluation terms for unsafe checks and blockers for king with adjusted weights. STC: LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 124526 W: 28292 L: 27504 D: 68730 Elo +2.20 http://tests.stockfishchess.org/tests/view/5d5138290ebc5925cf1070c3 LTC: LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 84968 W: 14499 L: 14083 D: 56386 Elo +1.70 http://tests.stockfishchess.org/tests/view/5d527cfa0ebc5925cf107f93 Bench: 4139590 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: joergoster
Date: Thu Aug 1 09:28:34 2019 +0200 Timestamp: 1564644514 Revert "Improve multiPV mode" This reverts commit a8de07cc26999e2fef7298a63bfe349aaa4650fa. 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: Wed Jul 31 09:35:20 2019 +0200 Timestamp: 1564558520 Tune search constants This is the result of a 200k tuning run at LTC: http://tests.stockfishchess.org/tests/view/5d3576b70ebc5925cf0e9e1e which passed quickly at LTC: LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 12954 W: 2280 L: 2074 D: 8600 Elo +5.53 http://tests.stockfishchess.org/tests/view/5d3ff3f70ebc5925cf0f87a2 STC failed, but second LTC at [0,4] passed easily: LLR: 2.96 (-2.94,2.94) [0.00,4.00] Total: 8004 W: 1432 L: 1252 D: 5320 Elo +7.81 http://tests.stockfishchess.org/tests/view/5d407cff0ebc5925cf0f9119 Further work? No doubt some of these changes produce most of the gain and some are neutral or even bad, so further testing on individual/groups of parameters changed here might show more gains. It does look like these tests might need to be at LTC though, so maybe not too practical to do. See the thread in the pull request for an interesting discussion: https://github.com/official-stockfish/Stockfish/pull/2260 Bench: 4024328 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 Jul 28 19:48:57 2019 +0200 Timestamp: 1564336137 Simplify weak lever STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 14844 W: 3347 L: 3212 D: 8285 Elo +3.16 http://tests.stockfishchess.org/tests/view/5d3a2d7b0ebc5925cf0f1632 LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 55261 W: 9374 L: 9309 D: 36578 Elo +0.41 http://tests.stockfishchess.org/tests/view/5d3a3d9e0ebc5925cf0f1786 Closes https://github.com/official-stockfish/Stockfish/pull/2257 bench: 3484124 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: Fri Jul 26 03:33:32 2019 +0200 Timestamp: 1564104812 Bug fix: always choose shortest mate in multithread mode In current master, with the voting scheme the best thread selection may pick a non mate or not the shortest mate thread. This patch fixes this bug. Formatting suggestion by Jörg Oster. Related past pull requests: https://github.com/official-stockfish/Stockfish/pull/1074 https://github.com/official-stockfish/Stockfish/pull/1215 Passed a [-4..0] verification test with 3 threads: LLR: 2.95 (-2.94,2.94) [-4.00,0.00] Total: 57158 W: 11374 L: 11424 D: 34360 Elo -0.30 http://tests.stockfishchess.org/tests/view/5d22deb30ebc5925cf0caefd Closes https://github.com/official-stockfish/Stockfish/pull/2226 No functional change (in single threaded mode) ---------------------------------------------------- Comment by Jörg Oster Just one sample output to demonstrate the effect of this patch. 5 Threads, 1 GB Hash +---+---+---+---+---+---+---+---+ | r | | b | | | r | k | | +---+---+---+---+---+---+---+---+ | | | | n | | p | b | | +---+---+---+---+---+---+---+---+ | | | p | | p | | p | | +---+---+---+---+---+---+---+---+ | p | | | | | | P | | +---+---+---+---+---+---+---+---+ | P | p | | | B | | N | Q | +---+---+---+---+---+---+---+---+ | | q | | | | | P | | +---+---+---+---+---+---+---+---+ | | | R | | | P | | | +---+---+---+---+---+---+---+---+ | | | | R | | | K | | +---+---+---+---+---+---+---+---+ Fen: r1b2rk1/3n1pb1/2p1p1p1/p5P1/Pp2B1NQ/1q4P1/2R2P2/3R2K1 w - - 8 34 Key: 38B4CA1067D4F477 Checkers: ucinewgame isready readyok go mate 17 searchmoves d1d7 info depth 65 seldepth 36 multipv 1 score mate 18 nodes 785875935 nps 8650448 hashfull 1000 tbhits 0 time 90848 pv d1d7 c8d7 g4f6 g7f6 g5f6 b3a3 g1g2 a3a1 h4g5 a1f6 g5f6 e6e5 c2c1 d7h3 g2h3 a8a6 h3g2 c6c5 f6a6 g8g7 c1c5 f7f6 a6e6 f8f7 c5c8 f6f5 e4d5 g7h6 e6f7 f5f4 f7e7 f4f3 d5f3 b4b3 c8h8 info depth 63 seldepth 36 multipv 1 score mate 17 nodes 785875935 nps 8650448 hashfull 1000 tbhits 0 time 90848 pv d1d7 c8d7 g4f6 g7f6 g5f6 b3a3 g1g2 a3a1 h4g5 a1f6 g5f6 e6e5 c2c1 d7h3 g2h3 a8a6 c1d1 b4b3 h3g2 c6c5 f6a6 g8g7 d1d7 g7g8 a6f6 b3b2 e4g6 b2b1q g6f7 f8f7 f6f7 g8h8 f7g7 bestmove d1d7 ponder c8d7 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: Fri Jul 26 02:12:23 2019 +0200 Timestamp: 1564099943 Remove operators for color This is a non-functional and untested simplification. The increment operator for color isn't really necessary and seems a bit unnatural to me. Passed STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 47027 W: 10589 L: 10518 D: 25920 Elo +0.52 http://tests.stockfishchess.org/tests/view/5d3472d10ebc5925cf0e8d3e Closes https://github.com/official-stockfish/Stockfish/pull/2247 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: Thu Jul 25 09:16:53 2019 +0200 Timestamp: 1564039013 Tweak of SEE pruning condition passed STC http://tests.stockfishchess.org/tests/view/5d386bda0ebc5925cf0ef49a LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 56874 W: 12820 L: 12373 D: 31681 Elo +2.73 passed LTC http://tests.stockfishchess.org/tests/view/5d38873a0ebc5925cf0ef86e LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 43512 W: 7547 L: 7247 D: 28718 Elo +2.40 Additional thanks to @locutus2 , @miguel-l and @xoto10 for fruitful discussion. There may be some more elo there since this tweak was the first one and numbers are more or less arbitrary. Closes https://github.com/official-stockfish/Stockfish/pull/2256 Bench 3935523 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: Thu Jul 25 09:05:08 2019 +0200 Timestamp: 1564038308 Pawn clean up Non functional simplification when we find the passed pawns in pawn.cpp and some code clean up. It also better follows the pattern "flag the pawn" and "score the pawn". ------------------------- The idea behind the third condition for candidate passed pawn is a little bit difficult to visualize. Just for the record, the idea is the following: Consider White e5 d4 against black e6. d4 can (in some endgames) push to d5 and lever e6. Thanks to this sacrifice, or after d5xe6, we consider e5 as "passed". However: - if White e5/d4 against black e6/c6: d4 cannot safely push to d5 since d5 is double attacked; - if White e5/d4 against black e6/d5: d4 cannot safely push to d5 since it is occupied. This is exactly what the following expression does: ``` && (shift<Up>(support) & ~(theirPawns | dblAttackThem))) ``` -------------------------- http://tests.stockfishchess.org/tests/view/5d3325bb0ebc5925cf0e6e91 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 124666 W: 27586 L: 27669 D: 69411 Elo -0.23 Closes https://github.com/official-stockfish/Stockfish/pull/2255 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 Jul 25 08:46:26 2019 +0200 Timestamp: 1564037186 LMR Tweak Reset statScore to zero if negative and most stats shows >= 0 STC: LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 23097 W: 5242 L: 4963 D: 12892 Elo +4.20 http://tests.stockfishchess.org/tests/view/5d31dd650ebc5925cf0e598f LTC: LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 227597 W: 39013 L: 38191 D: 150393 Elo +1.25 http://tests.stockfishchess.org/tests/view/5d31fcdf0ebc5925cf0e5c13 Closes https://github.com/official-stockfish/Stockfish/pull/2252 Bench: 3242229 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: Thu Jul 25 08:32:49 2019 +0200 Timestamp: 1564036369 Passed file cleanup Protonspring had a successful functional simplification that removes the PassedFile array using a simple linear equation. Merge the additive term S(5, 10) of protonspring passed file simplification (pull request https://github.com/official-stockfish/Stockfish/pull/2250) into the PassedRank array. This harmless change has a different bench because the candidate passer evaluation will always get less compared to #2250, as we apply bonus = bonus /2. Tested as a non-regression against #2250 Passed STC http://tests.stockfishchess.org/tests/view/5d33427e0ebc5925cf0e6fa2 LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 81459 W: 18174 L: 18171 D: 45114 Elo +0.01 Passed LTC http://tests.stockfishchess.org/tests/view/5d335c8d0ebc5925cf0e731e LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 18525 W: 3176 L: 3052 D: 12297 Elo +2.33 Closes https://github.com/official-stockfish/Stockfish/pull/2250 Closes https://github.com/official-stockfish/Stockfish/pull/2251 Bench: 3859856 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 Jul 25 08:23:43 2019 +0200 Timestamp: 1564035823 No influence on unsafeSquares of passers by pieces Remove their pieces from influencing 'unsafeSquares' in passer evaluation. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 36421 W: 8170 L: 8078 D: 20173 Elo +0.88 http://tests.stockfishchess.org/tests/view/5d22fc8e0ebc5925cf0cb26e LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 18927 W: 3253 L: 3129 D: 12545 Elo +2.28 http://tests.stockfishchess.org/tests/view/5d26e2b20ebc5925cf0d3218 Closes https://github.com/official-stockfish/Stockfish/pull/2248 Bench: 3285659 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 Jul 25 08:17:11 2019 +0200 Timestamp: 1564035431 Tweak LMR and killers Give extra stat bonus/malus in case of LMR for killers. passed STC http://tests.stockfishchess.org/tests/view/5d2c8e760ebc5925cf0dcf23 LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 67188 W: 15030 L: 14534 D: 37624 Elo +2.56 passed LTC http://tests.stockfishchess.org/tests/view/5d2d0ce40ebc5925cf0de115 LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 144355 W: 24739 L: 24153 D: 95463 Elo +1.41 Closes https://github.com/official-stockfish/Stockfish/pull/2246 bench 3723147 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: Thu Jul 25 08:07:55 2019 +0200 Timestamp: 1564034875 Space Invaders Try a more ambitius simplification of the space bonus STC http://tests.stockfishchess.org/tests/view/5d2b62c90ebc5925cf0da2a4 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 51299 W: 11320 L: 11257 D: 28722 Elo +0.43 LTC http://tests.stockfishchess.org/tests/view/5d2bac270ebc5925cf0db215 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 49761 W: 8409 L: 8335 D: 33017 Elo +0.52 Closes https://github.com/official-stockfish/Stockfish/pull/2243 bench: 3395999 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: Marco Costalba
Date: Sun Jul 14 15:21:08 2019 +0200 Timestamp: 1563110468 Fix bench Bench: 3357457 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 Jul 14 14:47:50 2019 +0200 Timestamp: 1563108470 UCI_Elo implementation (#2225) This exploits the recent fractional Skill Level, and is a result from some discussion in #2221 and the older #758. Basically, if UCI_LimitStrength is set, it will internally convert UCI_Elo to a matching fractional Skill Level. The Elo estimate is based on games at TC 60+0.6, Hash 64Mb, 8moves_v3.pgn, rated with Ordo, anchored to goldfish1.13 (CCRL 40/4 ~2000). Note that this is mostly about internal consistency, the anchoring to CCRL is a bit weak, e.g. within this tournament, goldfish and sungorus only have a 200Elo difference, their rating difference on CCRL is 300Elo. I propose that we continue to expose 'Skill Level' as an UCI option, for backwards compatibility. The result of a tournament under those conditions are given by the following table, where the player name reflects the UCI_Elo. # PLAYER : RATING ERROR POINTS PLAYED (%) CFS(%) 1 Elo2837 : 2792.2 50.8 536.5 711 75 100 2 Elo2745 : 2739.0 49.0 487.5 711 69 100 3 Elo2654 : 2666.4 49.2 418.0 711 59 100 4 Elo2562 : 2604.5 38.5 894.5 1383 65 100 5 Elo2471 : 2515.2 38.1 651.5 924 71 100 6 Elo2380 : 2365.9 35.4 478.5 924 52 100 7 Elo2289 : 2290.0 28.0 864.0 1596 54 100 8 sungorus1.4 : 2204.9 27.8 680.5 1596 43 60 9 Elo2197 : 2201.1 30.1 523.5 924 57 100 10 Elo2106 : 2103.8 24.5 730.5 1428 51 100 11 Elo2014 : 2030.5 30.3 377.5 756 50 98 12 goldfish1.13 : 2000.0 ---- 511.0 1428 36 100 13 Elo1923 : 1928.5 30.9 641.5 1260 51 100 14 Elo1831 : 1829.0 42.1 370.5 756 49 100 15 Elo1740 : 1738.3 42.9 277.5 756 37 100 16 Elo1649 : 1625.0 42.1 525.5 1260 42 100 17 Elo1558 : 1521.5 49.9 298.0 756 39 100 18 Elo1467 : 1471.3 51.3 246.5 756 33 100 19 Elo1375 : 1407.1 51.9 183.0 756 24 --- It can be observed that all set Elos correspond within the error bars with the observed Ordo rating. 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: protonspring
Date: Sun Jul 14 14:46:10 2019 +0200 Timestamp: 1563108370 Remove std::pow from reduction. (#2234) This is a functional simplification that removes the std::pow from reduction. The resulting reduction values are within 1% of master. This is a simplification because i believe an fp addition and multiplication is much faster than a call to std::pow() which is historically slow and performance varies widely on different architectures. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 23471 W: 5245 L: 5127 D: 13099 Elo +1.75 http://tests.stockfishchess.org/tests/view/5d27ac1b0ebc5925cf0d476b LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 51533 W: 8736 L: 8665 D: 34132 Elo +0.48 http://tests.stockfishchess.org/tests/view/5d27b74e0ebc5925cf0d493c Bench 3765158 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 Jul 14 14:42:30 2019 +0200 Timestamp: 1563108150 Just blockSq, not forward file. Bench: 3377831 (#2240) This is another functional simplification to Stockfish passed pawn evaluation. Stockfish evaluates some pawns which are not yet passed as "candidate" passed pawns, which are given half the bonus of fully passed ones. Prior to this commit, Stockfish considered a passed pawn to be a "candidate" if (a) it would not be a passed pawn if moved one square forward (the blocking square), or (b) there were other pawns (of either color) in front of it on the file. This latter condition used a fairly complicated method, forward_file_bb; here, rather than inspect the entire forward file, we simply re-use the blocking square. As a result, some pawns previously considered "candidates", but which are able to push forward, no longer have their bonus halved. Simplification tests passed quickly at both STC and LTC. The results from both tests imply that this simplification is, most likely, additionally a small Elo gain, with a LTC likelihood of superiority of 87 percent. STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 12908 W: 2909 L: 2770 D: 7229 Elo +3.74 http://tests.stockfishchess.org/tests/view/5d2a1c880ebc5925cf0d9006 LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 20723 W: 3591 L: 3470 D: 13662 Elo +2.03 http://tests.stockfishchess.org/tests/view/5d2a21fd0ebc5925cf0d9118 Bench: 3377831 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: Michael Chaly
Date: Sun Jul 14 14:41:28 2019 +0200 Timestamp: 1563108088 tviigg. (#2238) Current master code made sence when we had 2 types of bonuses for protected path to queen. But it was simplified so we have only one bonus now and code was never cleaned. This non-functional simplification removes useless defendedsquares bitboard and removes one bitboard assignment (defendedSquares &= attackedBy[Us][ALL_PIECES] + defendedSquares & blockSq becomes just attackedBy[Us][ALL_PIECES] & blockSq also we never assign defendedSquares = squaresToQueen because we don't need it). So should be small non-functional speedup. Passed simplification SPRT. http://tests.stockfishchess.org/tests/view/5d2966ef0ebc5925cf0d7659 LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 23319 W: 5152 L: 5034 D: 13133 Elo +1.76 bench 3361902 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 Jul 14 14:40:45 2019 +0200 Timestamp: 1563108045 Linear formula for w. Bench: 3328507 (#2239) In Stockfish, both the middlegame and endgame bonus for a passed pawn are calculated as a product of two factors. The first is k, chosen based on the presence of defended and unsafe squares. The second is w, a quadratic function of the pawn's rank. Both are only applied if the pawn's relative rank is at least RANK_4. It does not appear that the complexity of a quadratic function is necessary for w. Here, we replace it with a simpler linear one, which performs equally at both STC and LTC. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 46814 W: 10386 L: 10314 D: 26114 Elo +0.53 http://tests.stockfishchess.org/tests/view/5d29686e0ebc5925cf0d76a1 LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 82372 W: 13845 L: 13823 D: 54704 Elo +0.09 http://tests.stockfishchess.org/tests/view/5d2980650ebc5925cf0d7bfd Bench: 3328507 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: Sat Jul 13 05:49:14 2019 +0200 Timestamp: 1562989754 Full bonus for LMR stats update Simplify previous commit by using the full bonus for LMR-triggered stats update. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 23684 W: 5255 L: 5137 D: 13292 Elo +1.73 http://tests.stockfishchess.org/tests/view/5d2826660ebc5925cf0d5180 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 16245 W: 2832 L: 2704 D: 10709 Elo +2.74 http://tests.stockfishchess.org/tests/view/5d282e9c0ebc5925cf0d529b Closes https://github.com/official-stockfish/Stockfish/pull/2236 Bench: 3361902 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: Fri Jul 12 09:26:45 2019 +0200 Timestamp: 1562916405 Late Move reduction and continuation history Update continuation history after LMR-triggered full depth research. Directly after a LMR-triggered full depth research, we update the continuation history for quiet moves (but with only half stat bonus). STC: LLR: 2.96 (-2.94,2.94) [0.50,4.50] Total: 39657 W: 8966 L: 8604 D: 22087 Elo +3.17 http://tests.stockfishchess.org/tests/view/5d279fa40ebc5925cf0d4566 LTC: LLR: 2.96 (-2.94,2.94) [0.50,3.50] Total: 32582 W: 5740 L: 5427 D: 21415 Elo +3.34 http://tests.stockfishchess.org/tests/view/5d27dbf90ebc5925cf0d4b7e Bench: 3239357 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 Jul 11 23:05:28 2019 +0200 Timestamp: 1562879128 Exclude passed pawns from Attacked2Unsupported We recently added a bonus for double pawn attacks on unsupported enemy pawns, on June 27. However, it is possible that the unsupported pawn may become a passer by simply pushing forward out of the double attack. By rewarding double attacks, we may inadvertently reward the creation of enemy passers, by encouraging both of our would-be stoppers to attack the enemy pawn even if there is no opposing friendly pawn on the same file. Here, we revise this term to exclude passed pawns. In order to simplify the code with this change included, we non-functionally rewrite Attacked2Unsupported to be a penalty for enemy attacks on friendly pawns, rather than a bonus for our attacks on enemy pawns. This allows us to exclude passed pawns with a simple & ~e->passedPawns[Us], while passedPawns[Them] is not yet defined in this part of the code. This dramatically reduces the proportion of positions in which Attacked2Unsupported is applied, to about a third of the original. To compensate, maintaining the same average effect across our bench positions, we nearly triple Attacked2Unsupported from S(0, 20) to S(0, 56). Although this pawn formation is rare, it is worth more than half a pawn in the endgame! STC: (stopped automatically by fishtest after 250,000 games) LLR: -0.87 (-2.94,2.94) [0.50,4.50] Total: 250000 W: 56585 L: 55383 D: 138032 Elo +1.67 http://tests.stockfishchess.org/tests/view/5d25795e0ebc5925cf0cfb51 LTC: LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 81038 W: 13965 L: 13558 D: 53515 Elo +1.74 http://tests.stockfishchess.org/tests/view/5d25f3920ebc5925cf0d10dd Closes https://github.com/official-stockfish/Stockfish/pull/2233 Bench: 3765158 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: Marco Costalba
Date: Thu Jul 11 12:22:20 2019 +0200 Timestamp: 1562840540 Assorted trivial cleanups June 2019 No functional change. see source |