| 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 Jun 9 14:33:34 2019 +0200 Timestamp: 1560083614 Simplify passed pawns. (#2159) This is a functional simplification. If all of the stoppers are levers, a simple pawn push passes. STC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 41768 W: 9360 L: 9278 D: 23130 Elo +0.68 http://tests.stockfishchess.org/tests/view/5ce82ed60ebc5925cf073a79 LTC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 40463 W: 6964 L: 6875 D: 26624 Elo +0.76 http://tests.stockfishchess.org/tests/view/5ce87d0b0ebc5925cf07472b 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 Jun 9 14:31:16 2019 +0200 Timestamp: 1560083476 Remove a few file_of's (simplify adjacent_files_bb) #2171 This is a non-functional simplification that removes two file_of(s). STC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 22030 W: 5106 L: 4984 D: 11940 Elo +1.92 http://tests.stockfishchess.org/tests/view/5cf028de0ebc5925cf0839e7 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 Jun 9 14:28:42 2019 +0200 Timestamp: 1560083322 Simplify WeakUnopposedPawn #2181 This is a functional simplification. Moves WeakUnopposedPawn to pawns.cpp and remove piece dependency. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 8699 W: 2000 L: 1853 D: 4846 Elo +5.87 http://tests.stockfishchess.org/tests/view/5cf7721b0ebc5925cf08ee79 LTC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 46605 W: 7969 L: 7890 D: 30746 Elo +0.59 http://tests.stockfishchess.org/tests/view/5cf7d5f70ebc5925cf08fa96 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: Sun Jun 9 14:27:50 2019 +0200 Timestamp: 1560083270 SEE Pruning Tweak (#2183) Don't SEE prune any check extensions STC (yellow): LLR: -2.96 (-2.94,2.94) [0.50,4.50] Total: 129934 W: 29390 L: 28905 D: 71639 Elo +1.30 http://tests.stockfishchess.org/tests/view/5cf6b1a70ebc5925cf08dedb LTC: LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 102115 W: 17692 L: 17224 D: 67199 Elo +1.59 http://tests.stockfishchess.org/tests/view/5cf830710ebc5925cf090331 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 Jun 9 14:26:53 2019 +0200 Timestamp: 1560083213 Advanced pawn pushes tweak (#2175) passed STC http://tests.stockfishchess.org/tests/view/5cf586ee0ebc5925cf08c0ed LLR: 2.96 (-2.94,2.94) [0.50,4.50] Total: 29496 W: 6718 L: 6406 D: 16372 Elo +3.68 passed LTC http://tests.stockfishchess.org/tests/view/5cf59b630ebc5925cf08c343 LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 40778 W: 7057 L: 6765 D: 26956 Elo +2.49 original idea from early 2018 by @jerrydonaldwatson Code slightly rewritten to be shorter and more logical, no functinal changes compared to passed patch. 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 Jun 9 14:24:06 2019 +0200 Timestamp: 1560083046 Simplify Outposts #2176 This is a functional simplification. This is NOT the exact version that was tested. Beyond the testing, an assignment was removed and a piece changes for consistency. Instead of rewarding ANY square past an opponent pawn as an "outpost," only use squares that are protected by our pawn. I believe this is more consistent with what the chess world calls an "outpost." STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 23540 W: 5387 L: 5269 D: 12884 Elo +1.74 http://tests.stockfishchess.org/tests/view/5cf51e6d0ebc5925cf08b823 LTC LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 53085 W: 9271 L: 9204 D: 34610 Elo +0.44 http://tests.stockfishchess.org/tests/view/5cf5279e0ebc5925cf08b992 bench 3424592 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 Jun 9 14:19:07 2019 +0200 Timestamp: 1560082747 Simplify k-value for passers. Bench: 3854907 (#2182) Stockfish evaluates passed pawns in part based on a variable k, which shapes the passed pawn bonus based on the number of squares between the current square and promotion square that are attacked by enemy pieces, and the number defended by friendly ones. Prior to this commit, we gave a large bonus when all squares between the pawn and the promotion square were defended, and if they were not, a somewhat smaller bonus if at least the pawn's next square was. However, this distinction does not appear to provide any Elo at STC or LTC. Where do we go from here? Many promising Elo-gaining patches were attempted in the past few months to refine passed pawn calculation, by altering the definitions of unsafe and defended squares. Stockfish uses these definitions to choose the value of k, so those tests interact with this PR. Therefore, it may be worthwhile to retest previously promising but not-quite-passing tests in the vicinity of this patch. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 42344 W: 9455 L: 9374 D: 23515 Elo +0.66 http://tests.stockfishchess.org/tests/view/5cf83ede0ebc5925cf0904fb LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 69548 W: 11855 L: 11813 D: 45880 Elo +0.21 http://tests.stockfishchess.org/tests/view/5cf8698f0ebc5925cf0908c8 Bench: 3854907 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 May 31 14:35:39 2019 +0200 Timestamp: 1559306139 Scale lazy threshold according to material. (#2170) STC LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 58543 W: 13238 L: 12782 D: 32523 Elo +2.71 http://tests.stockfishchess.org/tests/view/5cef3efa0ebc5925cf081f07 LTC LLR: 3.70 (-2.94,2.94) [0.00,3.50] Total: 82232 W: 14281 L: 13825 D: 54126 Elo +1.93 http://tests.stockfishchess.org/tests/view/5cef595d0ebc5925cf082441 bench 3807737 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: Wed May 29 10:00:32 2019 +0200 Timestamp: 1559116832 Simplify semiopen_file (#2165) This is a non-functional simplification. Since our file_bb handles either Files or Squares, using Square here removes some code. Not likely any performance difference despite the test. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 6081 W: 1444 L: 1291 D: 3346 Elo +8.74 http://tests.stockfishchess.org/tests/view/5ceb3e2e0ebc5925cf07ab03 Non 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 May 25 09:43:52 2019 +0200 Timestamp: 1558770232 Remove one division. (#2158) Can be included in the earlier calculation, with a small rounding difference. passed STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 17912 W: 4044 L: 3915 D: 9953 Elo +2.50 http://tests.stockfishchess.org/tests/view/5ce711f90ebc5925cf070d0e passed LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 56061 W: 9579 L: 9516 D: 36966 Elo +0.39 http://tests.stockfishchess.org/tests/view/5ce716820ebc5925cf070e37 Bench: 3817662 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: Fri May 17 13:38:23 2019 +0200 Timestamp: 1558093103 Allow RQ through pieces. Bench: 3415326 (#2153) We evaluate defended and unsafe squares for a passed pawn push based on friendly and enemy rooks and queens on the passed pawn's file. Prior to this patch, we further required that these rooks and queens be able to directly attack the passed pawn. However, this restriction appears unnecessary and worth almost exactly 0 Elo at LTC. The simplified code allows rooks and queens to attack/defend the passed pawn through other pieces of either color. STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 29019 W: 6488 L: 6381 D: 16150 Elo +1.28 http://tests.stockfishchess.org/tests/view/5cdcf7270ebc5925cf05d30c LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 54224 W: 9200 L: 9133 D: 35891 Elo +0.43 http://tests.stockfishchess.org/tests/view/5cddc6210ebc5925cf05eca3 Bench: 3415326 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: svivanov72
Date: Thu May 16 14:14:11 2019 +0200 Timestamp: 1558008851 Remove unused code (#2150) Remove an unused operator in has_game_cycle (thanks @vondele) and modify its comment to explain other code. 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: Thu May 16 14:13:16 2019 +0200 Timestamp: 1558008796 Score and Select Best Thread in same loop (#2125) This is a non-functional simplification that combines vote counting and thread selecting in the same loop. It is possible that the best thread would be updated more frequently than master, but I'm not sure it matters here. Perhaps "mostVotes" is a better name than "bestVote?" STC (stopped early). LLR: 0.70 (-2.94,2.94) [-3.00,1.00] Total: 10714 W: 2329 L: 2311 D: 6074 Elo +0.58 http://tests.stockfishchess.org/tests/view/5ccc71470ebc5925cf03d244 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: Thu May 16 14:11:00 2019 +0200 Timestamp: 1558008660 Consolidate some code in set_state. (#2151) Non 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: xoto10
Date: Wed May 15 11:23:07 2019 +0200 Timestamp: 1557912187 Update failedHighCnt rule #2063 Treat all threads the same as main thread and increment failedHighCnt on fail highs. This makes the search try again at lower depth. @vondele suggested also changing the reset of failedHighCnt when there is a fail low. Tests including this passed so the branch has been updated to include both changes. failedHighCnt is now handled exactly the same in helper threads and the main thread. Thanks vondele :-) STC @ 5+0.05 th 4 : LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 7769 W: 1704 L: 1557 D: 4508 Elo +6.57 http://tests.stockfishchess.org/tests/view/5c9f19520ebc5925cfffd2a1 LTC @ 20+0.2 th 8 : LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 37888 W: 5983 L: 5889 D: 26016 Elo +0.86 http://tests.stockfishchess.org/tests/view/5c9f57d10ebc5925cfffd696 Bench 3824325 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: Wed May 15 10:52:15 2019 +0200 Timestamp: 1557910335 Revert "Make rootDepth local to search. (#2077)" This reverts commit 44c320a572188b5875291103edb344c584b91d19. Fix a compile error. Bench: 3824325 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: Wed May 15 10:31:21 2019 +0200 Timestamp: 1557909081 Simplify connected #2114 This is a functional simplification that simplifies some of the math for connected pawns. The bench is different because I moved a /2 from opposed into the connected array. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 37954 W: 8504 L: 8415 D: 21035 Elo +0.81 http://tests.stockfishchess.org/tests/view/5cbf599a0ebc5925cf028156 LTC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 27780 W: 4682 L: 4572 D: 18526 Elo +1.38 http://tests.stockfishchess.org/tests/view/5cbf6a5e0ebc5925cf0284b8 Bench 3824325 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: Moez Jellouli
Date: Wed May 15 10:26:32 2019 +0200 Timestamp: 1557908792 Simplify reduction formula #2122 Simplify reduction formula 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: Wed May 15 10:24:00 2019 +0200 Timestamp: 1557908640 Simplify Thread Voting Scheme #2129 This is a functional simplification of the math in the voting scheme. It took a bit longer to pass LTC 8 threads, so perhaps more testing is needed at longer times and/or more threads. STC 4 threads LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 22315 W: 4852 L: 4732 D: 12731 Elo +1.87 http://tests.stockfishchess.org/tests/view/5ccc86280ebc5925cf03d439 STC 8 threads LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 42427 W: 8451 L: 8369 D: 25607 Elo +0.67 http://tests.stockfishchess.org/tests/view/5cccb67c0ebc5925cf03da90 LTC 4 Threads LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 23513 W: 4208 L: 4092 D: 15213 Elo +1.71 http://tests.stockfishchess.org/tests/view/5ccce94d0ebc5925cf03e1ec LTC 8 Threads LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 70098 W: 11442 L: 11399 D: 47257 Elo +0.21 http://tests.stockfishchess.org/tests/view/5ccd22aa0ebc5925cf03e463 No functional change (in single thread) 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: svivanov72
Date: Wed May 15 10:22:21 2019 +0200 Timestamp: 1557908541 Precompute repetition info (#2132) Store repetition info in StateInfo instead of recomputing it in three different places. This saves some work in has_game_cycle() where this info is needed for positions before the root. Tested for non-regression at STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 34104 W: 7586 L: 7489 D: 19029 Elo +0.99 http://tests.stockfishchess.org/tests/view/5cd0676e0ebc5925cf044b56 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: xoto10
Date: Wed May 15 10:18:49 2019 +0200 Timestamp: 1557908329 Remove pawn count in space() calculation #2139 Simplification. Various attempts to optimise the pawn count bonus showed little effect, so remove pawn count altogether and compensate by subtracting 1 instead of 4. STC 10+0.1 th 1: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 152244 W: 33709 L: 33847 D: 84688 Elo -0.31 http://tests.stockfishchess.org/tests/view/5cceed330ebc5925cf04170e LTC 60+0.6 th 1: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 24100 W: 4079 L: 3964 D: 16057 Elo +1.66 http://tests.stockfishchess.org/tests/view/5cd5b6b80ebc5925cf04e889 Bench: 3648841 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 May 15 10:12:38 2019 +0200 Timestamp: 1557907958 Add eg component to evaluate_shelter() #2137 Add an endgame component to the blockedstorm penalty so that the penalty applies more uniformly through the game. STC 10+0.1 th 1 : LLR: -2.95 (-2.94,2.94) [0.50,4.50] Total: 94063 W: 21426 L: 21118 D: 51519 Elo +1.14 http://tests.stockfishchess.org/tests/view/5cd4605c0ebc5925cf04bf43 LTC 60+0.6 th 1 : LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 188232 W: 32808 L: 32090 D: 123334 Elo +1.33 http://tests.stockfishchess.org/tests/view/5cd47d0a0ebc5925cf04c4fd Refactored code with higher constant values gave a more convincing LTC result: LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 30050 W: 5330 L: 5066 D: 19654 Elo +3.05 http://tests.stockfishchess.org/tests/view/5cd6a0000ebc5925cf050653 Bench: 3687700 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 15 09:52:27 2019 +0200 Timestamp: 1557906747 Allow for higher depths. (#2147) High rootDepths, selDepths and generally searches are increasingly common with long time control games, analysis, and improving hardware. In this case, depths of MAX_DEPTH/MAX_PLY (128) can be reached, and the search tree is truncated. In principle MAX_PLY can be easily increased, except for a technicality of storing depths in a signed 8 bit int in the TT. This patch increases MAX_PLY by storing the depth in an unsigned 8 bit, after shifting by the most negative depth stored in TT (DEPTH_NONE). No regression at STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 42235 W: 9565 L: 9484 D: 23186 Elo +0.67 http://tests.stockfishchess.org/tests/view/5cdb35360ebc5925cf0595e1 Verified to reach high depths on k1b5/1p1p4/pP1Pp3/K2pPp2/1P1p1P2/3P1P2/5P2/8 w - - info depth 142 seldepth 154 multipv 1 score cp 537 nodes 26740713110 ... No bench 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: Michael Chaly
Date: Wed May 15 09:49:29 2019 +0200 Timestamp: 1557906569 Decrease reduction in case we had singular extension. #2146 Passed STC http://tests.stockfishchess.org/tests/view/5cda71790ebc5925cf057a84 LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 73454 W: 16482 L: 15954 D: 41018 Elo +2.50 Passed LTC http://tests.stockfishchess.org/tests/view/5cdab17b0ebc5925cf05822f LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 56696 W: 9877 L: 9538 D: 37281 Elo +2.08 Original idea by @locutus2 bench 3378510 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: Miguel Lahoz
Date: Thu May 9 18:00:58 2019 +0200 Timestamp: 1557417658 Remove PvNode template from reduction This functional simplification removes the PvNode reduction and adjusts the ttPv lmr condition accordingly. Their definitions only differ by the inclusions of ttPv. Aside from this, shallow move pruning definition will be the only other functional difference, but this does not seem to matter too much. STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 58908 W: 12980 L: 12932 D: 32996 Elo +0.28 http://tests.stockfishchess.org/tests/view/5cd1aaaa0ebc5925cf046c6a LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 20351 W: 3521 L: 3399 D: 13431 Elo +2.08 http://tests.stockfishchess.org/tests/view/5cd23fa70ebc5925cf047cd2 Bench: 3687854 see source |