Stefan Geschwentner and Stéphane Nicolet
95f73ff393
Remove formerPV variable.
...
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 75672 W: 6546 L: 6496 D: 62630
Ptnml(0-2): 238, 5274, 26761, 5326, 237
https://tests.stockfishchess.org/tests/view/60b349c0ec0c03148cbed055
LTC:
LLR: 2.98 (-2.94,2.94) <-2.50,0.50>
Total: 137816 W: 4676 L: 4689 D: 128451
Ptnml(0-2): 52, 4237, 60354, 4202, 63
https://tests.stockfishchess.org/tests/view/60b38970ec0c03148cbed075
closes https://github.com/official-stockfish/Stockfish/pull/3515
Bench: 4892288
2021-06-01 23:21:00 +02:00
Stefan Geschwentner and Stéphane Nicolet
1b325bf86d
Less reduction for capture/promotions.
...
Exclude captures/promotions at expected cut nodes (which also not a
former PV node) from LMR if a response to the first previous
opponent move.
STC:
LLR: 2.93 (-2.94,2.94) <-0.50,2.50>
Total: 288656 W: 24886 L: 24413 D: 239357
Ptnml(0-2): 900, 19738, 102578, 20213, 899
https://tests.stockfishchess.org/tests/view/60ad505112066fd29979595b
LTC:
LLR: 2.97 (-2.94,2.94) <0.50,3.50>
Total: 31344 W: 1107 L: 975 D: 29262
Ptnml(0-2): 12, 879, 13757, 1013, 11
https://tests.stockfishchess.org/tests/view/60adffce12066fd2997959d2
closes https://github.com/official-stockfish/Stockfish/pull/3500
Bench: 3827710
2021-05-26 17:32:54 +02:00
Stefan Geschwentner and Joost VandeVondele
c0ff241464
Thread based reduction tweak.
...
For PV nodes at the first two plies no reductions are done for each fourth thread.
STC (8 threads):
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 53992 W: 3334 L: 3167 D: 47491
Ptnml(0-2): 64, 2713, 21285, 2860, 74
https://tests.stockfishchess.org/tests/view/6083b2d695e7f1852abd277a
LTC (8 threads):
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 64888 W: 1888 L: 1725 D: 61275
Ptnml(0-2): 14, 1556, 29146, 1709, 19
https://tests.stockfishchess.org/tests/view/6084249595e7f1852abd2795
closes https://github.com/official-stockfish/Stockfish/pull/3443
No functional change (for one thread)
2021-04-25 13:21:57 +02:00
Stefan Geschwentner and Joost VandeVondele
4262461457
Tweak capture LMR.
...
Apply the recently added LMR condition for captures at nodes which are not PV or former PV nodes only if capture history is not too good.
STC:
LLR: 2.96 (-2.94,2.94) {-0.25,1.25}
Total: 95296 W: 8917 L: 8660 D: 77719
Ptnml(0-2): 323, 6871, 33045, 7044, 365
https://tests.stockfishchess.org/tests/view/5feca7f46019e097de3ee9ae
LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.25}
Total: 29216 W: 1172 L: 1034 D: 27010
Ptnml(0-2): 11, 946, 12568, 1060, 23
https://tests.stockfishchess.org/tests/view/5fecf1786019e097de3ee9d5
closes https://github.com/official-stockfish/Stockfish/pull/3283
Bench: 4006138
2020-12-31 17:41:34 +01:00
Stefan Geschwentner and Joost VandeVondele
6f0aa186d8
Tweak reduction formula.
...
Replace log(i) with log(i + 0.25 * log(i)). This increases especially for low values the reductions. But for bigger values there are nearly no changes.
STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 49640 W: 5505 L: 5289 D: 38846
Ptnml(0-2): 270, 4074, 15924, 4274, 278
https://tests.stockfishchess.org/tests/view/5f71f04d3b22d6afa5069478
LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 43856 W: 2209 L: 2021 D: 39626
Ptnml(0-2): 32, 1776, 18128, 1956, 36
https://tests.stockfishchess.org/tests/view/5f7232ee3b22d6afa50699a2
closes https://github.com/official-stockfish/Stockfish/pull/3163
Bench: 3555769
2020-09-28 22:34:25 +02:00
Stefan Geschwentner and Joost VandeVondele
16b4578cc1
Tweak hybrid treshold.
...
Increase the first hybrid threshold with more material.
Rewrite the hybrid rules for clarity.
STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 24416 W: 3039 L: 2848 D: 18529
Ptnml(0-2): 135, 2136, 7503, 2271, 163
https://tests.stockfishchess.org/tests/view/5f6451efbb0cae038ca8f4dc
LTC;
LLR: 2.95 (-2.94,2.94) {0.25,1.25}
Total: 65016 W: 3702 L: 3455 D: 57859
Ptnml(0-2): 66, 2991, 26157, 3218, 76
https://tests.stockfishchess.org/tests/view/5f64b143bb0cae038ca8f51f
closes https://github.com/official-stockfish/Stockfish/pull/3140
Bench: 3973739
2020-09-21 08:19:10 +02:00
Stefan Geschwentner and Joost VandeVondele
615d98da24
Do move legality check before pruning.
...
This alllows to simplify the code because the move counter haven't to be
decremented later if a move isn't legal. As a side effect now illegal
pruned moves doesn't included anymore in move counter. So slightly less
pruning and reductions are done.
STC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 111016 W: 21106 L: 21077 D: 68833
Ptnml(0-2): 1830, 13083, 25736, 12946, 1913
https://tests.stockfishchess.org/tests/view/5f28816fa5abc164f05e4c26
LTC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 39264 W: 4909 L: 4843 D: 29512
Ptnml(0-2): 263, 3601, 11854, 3635, 279
https://tests.stockfishchess.org/tests/view/5f297902a5abc164f05e4c8e
closes https://github.com/official-stockfish/Stockfish/pull/2906
Bench: 4390086
2020-08-07 09:05:20 +02:00
Stefan Geschwentner and Joost VandeVondele
8b8412ef87
Add tempo also to NNUE eval.
...
STC:
LLR: 2.93 (-2.94,2.94) {-0.50,1.50}
Total: 10608 W: 1507 L: 1358 D: 7743
Ptnml(0-2): 94, 945, 3074, 1100, 91
https://tests.stockfishchess.org/tests/view/5f2c5921b3ebe5cbfee85b8b
LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 7536 W: 556 L: 448 D: 6532
Ptnml(0-2): 9, 383, 2881, 481, 14
https://tests.stockfishchess.org/tests/view/5f2c6f4461e3b6af64881e95
closes https://github.com/official-stockfish/Stockfish/pull/2919
Bench: 4746616
2020-08-07 08:54:38 +02:00
Stefan Geschwentner and Stéphane Nicolet
9587eeeb5e
Tweak cutnode reduction
...
Less reduction for second move at non-check CUT node with depth <= 10.
STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 38680 W: 7490 L: 7245 D: 23945
Ptnml(0-2): 643, 4441, 8967, 4606, 683
https://tests.stockfishchess.org/tests/view/5f21e1782f7e63962b99f451
LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 71976 W: 9003 L: 8636 D: 54337
Ptnml(0-2): 440, 6414, 21972, 6663, 499
https://tests.stockfishchess.org/tests/view/5f2245762f7e63962b99f4bd
closes https://github.com/official-stockfish/Stockfish/pull/2868
Bench: 4746616
2020-07-31 10:12:54 +02:00
Stefan Geschwentner and Joost VandeVondele
7225d254f9
Add a rank based bonus for blocked pawns.
...
Fix for overevaluated blocked pawns on the 5th and 6th rank.
This is a rewrite of the original idea that uses only two parameters.
Thanks to rocky640 for pointing this out.
STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 50800 W: 9707 L: 9446 D: 31647
Ptnml(0-2): 831, 5851, 11822, 6018, 878
https://tests.stockfishchess.org/tests/view/5f00b4f359f6f03532894304
LTC:
LLR: 2.93 (-2.94,2.94) {0.25,1.75}
Total: 52064 W: 6477 L: 6167 D: 39420
Ptnml(0-2): 331, 4628, 15834, 4878, 361
https://tests.stockfishchess.org/tests/view/5f0115fe59f6f03532894345
closes https://github.com/official-stockfish/Stockfish/pull/2794
Bench: 4882833
2020-07-06 17:56:18 +02:00
Stefan Geschwentner and Joost VandeVondele
69d3be42a1
Tweak single queen endgame scaling.
...
Increase scaling factor for each minor of the opponent side of the queen.
STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 14528 W: 2860 L: 2653 D: 9015
Ptnml(0-2): 217, 1632, 3408, 1741, 266
https://tests.stockfishchess.org/tests/view/5ef98384020eec13834a96a0
LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 34584 W: 4371 L: 4111 D: 26102
Ptnml(0-2): 205, 3080, 10501, 3262, 244
https://tests.stockfishchess.org/tests/view/5ef99972020eec13834a96c9
closes https://github.com/official-stockfish/Stockfish/pull/2782
Bench: 4523573
2020-06-29 20:02:58 +02:00
Stefan Geschwentner and Joost VandeVondele
16836f39b2
Scale down eval for drawish rook endgames.
...
STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 82136 W: 15694 L: 15407 D: 51035
Ptnml(0-2): 1076, 8960, 20767, 9131, 1134
https://tests.stockfishchess.org/tests/view/5ef86cf8020eec13834a94dd
LTC:
LLR: 2.93 (-2.94,2.94) {0.25,1.75}
Total: 70200 W: 8787 L: 8440 D: 52973
Ptnml(0-2): 325, 5983, 22170, 6264, 358
https://tests.stockfishchess.org/tests/view/5ef88225020eec13834a950a
closes https://github.com/official-stockfish/Stockfish/pull/2780
Bench: 4478869
2020-06-28 22:05:09 +02:00
Stefan Geschwentner and Joost VandeVondele
d1ec10cd4f
Give bonus for bishops that are alligned with enemy kingring.
...
Inspired by the succesful patch "Give bonus for rooks that are alligned with enemy kingring" from Vizvezdenec,
this idea has been reused for bishops. Here, we only consider attacks that are not blocked by any pawn.
Also we have a 50% higher bonus than for the rooks.
STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 68960 W: 13495 L: 13202 D: 42263
Ptnml(0-2): 1213, 8018, 15802, 8157, 1290
https://tests.stockfishchess.org/tests/view/5ed27495042fa6d77c3553aa
LTC:
LLR: 2.96 (-2.94,2.94) {0.25,1.75}
Total: 54560 W: 7105 L: 6780 D: 40675
Ptnml(0-2): 379, 4986, 16254, 5253, 408
https://tests.stockfishchess.org/tests/view/5ed30375596e6dc1e1f97425
closes https://github.com/official-stockfish/Stockfish/pull/2708
Bench: 4860021
2020-06-01 17:35:02 +02:00
Stefan Geschwentner and Stéphane Nicolet
cdf5cfdb92
Add doubled isolated pawn penalty.
...
This patch gives an additional penalty if a doubled isolated pawn is stopped
only by a single opponent pawn on the same file. Thanks to NKONSTANTAKIS,
who shared this idea on the forum!
https://groups.google.com/forum/?fromgroups=#!topic/fishcooking/vC4Qn-PMlS4 .
STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 84872 W: 16688 L: 16370 D: 51814
Ptnml(0-2): 1507, 9940, 19274, 10158, 1557
https://tests.stockfishchess.org/tests/view/5ec65bd955202b947dc5d4ac
LTC:
LLR: 2.93 (-2.94,2.94) {0.25,1.75}
Total: 58104 W: 7614 L: 7278 D: 43212
Ptnml(0-2): 411, 5369, 17196, 5625, 451
https://tests.stockfishchess.org/tests/view/5ec6e9f2c23f5b0710632b19
Closes https://github.com/official-stockfish/Stockfish/pull/2694
Bench: 5148950
2020-05-22 20:40:24 +02:00
Stefan Geschwentner and Stéphane Nicolet
09c6917d05
Tweak knight mobility
...
New tuned values for knight mobility in endgames.
STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 112576 W: 21999 L: 21644 D: 68933
Ptnml(0-2): 2009, 13084, 25735, 13463, 1997
https://tests.stockfishchess.org/tests/view/5ec58379377121ac09e10272
LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 125192 W: 16200 L: 15671 D: 93321
Ptnml(0-2): 891, 11584, 37182, 11983, 956
https://tests.stockfishchess.org/tests/view/5ec5c0b8377121ac09e1028b
Closes https://github.com/official-stockfish/Stockfish/pull/2693
Bench: 4778956
2020-05-21 14:11:14 +02:00
Stefan Geschwentner and Joost VandeVondele
5c58f67126
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
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
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
2020-04-14 08:01:53 +02:00
Stefan Geschwentner and Stéphane Nicolet
01b6088af3
History update for pruned captures
...
Use a SEE pruned capture move for history updates: this patch collects
pruned capture moves also in the failed captures list, so that they get
an update in capture history.
STC:
LLR: 2.95 (-2.94,2.94) {-1.00,3.00}
Total: 11124 W: 2222 L: 2089 D: 6813
Ptnml(0-2): 186, 1280, 2506, 1381, 200
http://tests.stockfishchess.org/tests/view/5e28995fc3b97aa0d75bc294
LTC:
LLR: 2.94 (-2.94,2.94) {0.00,2.00}
Total: 25552 W: 3418 L: 3211 D: 18923
Ptnml(0-2): 168, 2354, 7538, 2490, 200
http://tests.stockfishchess.org/tests/view/5e2943734744cfa4d6af415b
Closes https://github.com/official-stockfish/Stockfish/pull/2511
Bench: 4810202
2020-01-23 19:12:48 +01:00
Stefan Geschwentner and Stéphane Nicolet
56e698ef83
Less reduction for escape moves at ttPv nodes
...
At expected PV nodes or nodes which marked as PV node in the hash table,
reduce escape moves even one ply less.
STC:
LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 31795 W: 6140 L: 5953 D: 19702
Ptnml(0-2): 525, 3625, 7455, 3695, 583
http://tests.stockfishchess.org/tests/view/5e25d77fc3b97aa0d75bc013
LTC:
LLR: 2.94 (-2.94,2.94) {0.00,2.00}
Total: 43975 W: 5708 L: 5454 D: 32813
Ptnml(0-2): 314, 4012, 13070, 4242, 325
http://tests.stockfishchess.org/tests/view/5e2618c1c3b97aa0d75bc03c
Closes https://github.com/official-stockfish/Stockfish/pull/2505
Bench: 4475583
2020-01-23 18:53:50 +01:00
Stefan Geschwentner and Stéphane Nicolet
7150183d07
Tweak reductions for captures/promotions
...
From the third move reduce captures and promotions more if remaining depth is low.
STC:
LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 25218 W: 5008 L: 4837 D: 15373
Ptnml(0-2): 439, 2950, 5717, 3001, 499
http://tests.stockfishchess.org/tests/view/5e1b33abd12216a2857e6359
LTC:
LLR: 2.95 (-2.94,2.94) {0.00,2.00}
Total: 35491 W: 4760 L: 4524 D: 26207
Ptnml(0-2): 264, 3288, 10413, 3460, 294
http://tests.stockfishchess.org/tests/view/5e1b88d5d12216a2857e6385
Closes https://github.com/official-stockfish/Stockfish/pull/2488
Bench: 4979757
2020-01-13 12:09:23 +01:00
Stefan Geschwentner and Stéphane Nicolet
56d5504f65
Tweak futility pruning
...
Exclude moves with a good history total from futility pruning. This adds
a condition for quiet futility pruning: history total has to be low.
STC:
LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 20095 W: 4503 L: 4342 D: 11250
Ptnml(0-2): 362, 2380, 4422, 2486, 388
http://tests.stockfishchess.org/tests/view/5e0d7c5387585b1706b68370
LTC:
LLR: 2.94 (-2.94,2.94) {0.00,2.00}
Total: 53016 W: 8587 L: 8302 D: 36127
Ptnml(0-2): 353, 5397, 14751, 5545, 423
http://tests.stockfishchess.org/tests/view/5e0e30d062fb773bb7047e95
Closes https://github.com/official-stockfish/Stockfish/pull/2472
Bench: 5215200
2020-01-07 11:18:50 +01:00
Stefan Geschwentner and Stéphane Nicolet
a00a336946
Prune before extension
...
Switch execution order in search: do move pruning before extension detection.
STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 5762 W: 1307 L: 1181 D: 3274
http://tests.stockfishchess.org/tests/view/5dcc56e90ebc59025bcbb833
LTC:
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 72956 W: 11959 L: 11585 D: 49412
http://tests.stockfishchess.org/tests/view/5dcc62840ebc59025bcbb96f
Closes https://github.com/official-stockfish/Stockfish/pull/2413
Bench: 4532366
2019-11-14 20:26:15 +01:00
Stefan Geschwentner and Stéphane Nicolet
1725ed39ad
Tweak dynamic contempt (the birthday patch)
...
Make dynamic contempt weight factor dependent on static contempt so that higher
static contempt implies less dynamic contempt and vice versa. For default contempt
24 this is a non-functional change. But tests with contempt 0 shows an elo gain.
Also today is my birthday so i have already give to myself a gift with this patch :-)!
Further proceedings:
in the past we checked for default contempt that it doesn't regress against
contempt 0. Now that the later is stronger and the former is the same strength
this should be rechecked. Perhaps the default contempt have to be lowered.
It would be interesting to get some idea of the impact of this patch outside
of the 0-24 contempt range.
STC: (both with contempt=0)
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 21912 W: 3898 L: 3740 D: 14274
http://tests.stockfishchess.org/tests/view/5db74b6f0ebc5902d1f37405
LTC: (both with contempt=0)
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 27172 W: 3350 L: 3126 D: 20696
http://tests.stockfishchess.org/tests/view/5db760020ebc5902d1f375d0
Closes https://github.com/official-stockfish/Stockfish/pull/2382
No functional change (for current default contempt 24).
2019-10-31 17:05:29 +01:00
Stefan Geschwentner and Stéphane Nicolet
61f44ce578
Update reverse move stats
...
For a good quiet non-pawn move consider the reverse move as bad
and update the main history with a negative stat bonus.
STC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 19292 W: 4401 L: 4141 D: 10750
http://tests.stockfishchess.org/tests/view/5d7751d50ebc594e7864973c
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 111952 W: 18762 L: 18275 D: 74915
http://tests.stockfishchess.org/tests/view/5d7771cf0ebc594e786498fa
Closes https://github.com/official-stockfish/Stockfish/pull/2294
Bench: 3914238
2019-09-11 18:37:08 +02:00
Stefan Geschwentner and Stéphane Nicolet
ff69d570d7
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
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
http://tests.stockfishchess.org/tests/view/5d282e9c0ebc5925cf0d529b
Closes https://github.com/official-stockfish/Stockfish/pull/2236
Bench: 3361902
2019-07-13 05:49:14 +02:00
Stefan Geschwentner and Stéphane Nicolet
389e60741f
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
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
http://tests.stockfishchess.org/tests/view/5d27dbf90ebc5925cf0d4b7e
Bench: 3239357
2019-07-12 09:26:45 +02:00
Stefan Geschwentner and Stéphane Nicolet
368f976fb6
Less LMR at root
...
Do no LMR for the first four moves if at root node.
STC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 19686 W: 4524 L: 4261 D: 10901
http://tests.stockfishchess.org/tests/view/5cd3577b0ebc5925cf04a089
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 88335 W: 15193 L: 14766 D: 58376
http://tests.stockfishchess.org/tests/view/5cd35e600ebc5925cf04a1c3
Bench: 3184182
2019-05-09 15:25:39 +02:00
Stefan Geschwentner and Stéphane Nicolet
28543cddc6
Store only unchanged static evaluations in TT
...
A recent commit introduced a decrease of the static evaluation of
an inner node dependent on the previous stat score, which finally
was also stored in the transposition table. Now only the unchanged
static evaluation are stored there.
Remark:
For the case that a static evaluation can be retrieved from the
transposition table the value is now used unchanged. Another test
which also applies the modification in this case failed:
http://tests.stockfishchess.org/tests/view/5b7af6df0ebc5902bdbae2f6
STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 6707 W: 1547 L: 1383 D: 3777
http://tests.stockfishchess.org/tests/view/5b7a92df0ebc5902bdbadcf3
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 36203 W: 6046 L: 5781 D: 24376
http://tests.stockfishchess.org/tests/view/5b7abaa10ebc5902bdbadfa9
Closes https://github.com/official-stockfish/Stockfish/pull/1742
Bench: 4457440
2018-08-20 21:52:29 +02:00
Stefan Geschwentner and Stéphane Nicolet
de0889612f
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
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
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
2018-05-08 23:31:55 +02:00
Stefan Geschwentner and Marco Costalba
4bc11984fc
Introduce capture history table for capture move sorting
...
Introduce capture move history table indexed by moved piece,
target square and captured piece type for sorting capture moves.
STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 11374 W: 2096 L: 1924 D: 7354
http://tests.stockfishchess.org/tests/view/59fac8dc0ebc590ccbb89fc5
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 24791 W: 3196 L: 3001 D: 18594
http://tests.stockfishchess.org/tests/view/59fae4d20ebc590ccbb89fd9
Bench: 5536775
2017-11-03 13:57:18 +01:00
Stefan Geschwentner and Joona Kiiski
69ec09bd4b
Bonus for pawn scrifice which create passed pawn
...
STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 16752 W: 3141 L: 2944 D: 10667
LTC:
LLR: 3.34 (-2.94,2.94) [0.00,5.00]
Total: 33928 W: 4544 L: 4300 D: 25084
Bench: 5639223
Closes #1092
2017-05-07 20:51:52 -07:00
Stefan Geschwentner and Marco Costalba
471f7a1b5c
Candidate passed pawns
...
Detect safe candidate passers.
STC: http://tests.stockfishchess.org/tests/view/5882395c0ebc5915193f78b3
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 53569 W: 9925 L: 9570 D: 34074
LTC: http://tests.stockfishchess.org/tests/view/5882b4fb0ebc5915193f78e2
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 77576 W: 10387 L: 10014 D: 57175
Bench: 5325829
2017-01-28 09:04:24 +01:00
Stefan Geschwentner and Marco Costalba
344616e917
Bonus for attacked passed pawn promotion path
...
Bonus for each attacked square on the promotion path
of an enemy passed pawn.
STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 141511 W: 25295 L: 24579 D: 91637
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 23161 W: 3022 L: 2831 D: 17308
Bench: 5926706
2016-10-30 13:48:03 +01:00
Stefan Geschwentner and Marco Costalba
6aa9308f08
Tweak probcut threshold
...
Use better threshold for capture move generation.
STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 23265 W: 4415 L: 4188 D: 14662
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 36618 W: 5083 L: 4836 D: 26699
bench: 7030088
2016-08-29 22:15:03 +02:00
Stefan Geschwentner and Joona Kiiski
a273b6ef8c
Add followup moves history for move ordering
...
STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 7955 W: 1538 L: 1378 D: 5039
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 5323 W: 778 L: 642 D: 3903
Bench: 8261839
Resolves #599
2016-03-10 14:26:06 -08:00
Stefan Geschwentner and Joona Kiiski
cccf3c815c
Bonus for reachable outpost
...
Give a bonus for outpost squares which in reach of a bishop or knight.
STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 22725 W: 4570 L: 4339 D: 13816
LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 15019 W: 2333 L: 2157 D: 10529
Bench: 8503181
Resolves #495
2015-11-14 06:31:45 -08:00
Stefan Geschwentner and Joona Kiiski
83e19fbed5
File based passed pawn bonus
...
Add file based bonus for passed pawns. Values tuned by SPSA.
STC:
LLR: 3.33 (-2.94,2.94) [0.00,5.00]
Total: 36889 W: 6805 L: 6507 D: 23577
LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 32301 W: 5101 L: 4858 D: 22342
Bench: 8073614
Resolves #436
2015-10-03 03:50:06 -07:00
Stefan Geschwentner and Joona Kiiski
660c38f781
Scales the endgame score by the number of pawns.
...
Credits goes also to Stephane Nicolet for his great idea of scaling by pawns.
STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 9994 W: 1929 L: 1760 D: 6305
LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 11240 W: 1789 L: 1626 D: 7825
bench 7298564
Resolves #423
2015-09-15 05:55:09 -07:00
Stefan Geschwentner and Gary Linscott
e14046517e
Remove Gain Stats
...
Additionally in futility pruning the margin is raised for compensation.
STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 48481 W: 9229 L: 9156 D: 30096
LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 32058 W: 5134 L: 5031 D: 21893
Bench: 8098149
Resolves #350
2015-05-18 13:59:30 -07:00
Stefan Geschwentner and Joona Kiiski
27efc5ac99
Update stats at pv nodes
...
If a quiet best move is found at a pv node then always update stats.
STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 41485 W: 8047 L: 7830 D: 25608
LTC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 14351 W: 2420 L: 2250 D: 9681
Bench: 6985247
Resolves #330
2015-04-10 20:34:55 +01:00
Stefan Geschwentner and Joona Kiiski
ef4d89c9bd
update stats also in check
...
Update stats also if in check (drop condition).
STC:
LLR: 3.22 (-2.94,2.94) [-3.00,1.00]
Total: 87472 W: 16929 L: 16913 D: 53630
LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 39971 W: 6436 L: 6345 D: 27190
Bench: 7086031
Resolves #327
2015-04-09 20:41:08 +01:00
Stefan Geschwentner and Joona Kiiski
13c11f4048
Introduce Counter Move History tables
...
Introduce a counter move history table which additionally is indexed by the last move's piece and target square.
For quiet move ordering use now the sum of standard and counter move history table.
STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 4747 W: 1005 L: 885 D: 2857
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 5726 W: 1001 L: 872 D: 3853
Because of reported low NPS on multi core test
STC (7 threads):
ELO: 7.26 +-3.3 (95%) LOS: 100.0%
Total: 14937 W: 2710 L: 2398 D: 9829
Bench: 7725341
Resolves #282
2015-03-12 07:29:57 +00:00
Stefan Geschwentner and Gary Linscott
18b0809639
Add bonus for pawn attack threats
...
Latent pawn attacks: Add a bonus to safe pawn pushes which attacks an
enemy piece. Based on an idea of Lyudmil Tsvetkov.
STC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 7925 W: 1666 L: 1537 D: 4722
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 40109 W: 6841 L: 6546 D: 26722
Bench: 7696257
Resolves #240
2015-02-03 11:19:33 +08:00
Stefan Geschwentner and Joona Kiiski
d8b3ad2208
Fix a skill level problem: Don't allow move pruning at root node
...
Bench: 8918745
Resolves #231
2015-01-25 21:57:13 +00:00
Stefan Geschwentner and Joona Kiiski
4abe333e1f
Enable Futility pruning in PV nodes
...
STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 21553 W: 4342 L: 4221 D: 12990
LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7675 W: 1351 L: 1209 D: 5115
Bench: 8668014
Resolves #205
2015-01-14 20:13:48 +00:00
Stefan Geschwentner and Gary Linscott
25b492ab58
Big King Safety tuning
...
All king safety related terms (shelterweakness, stormdanger,
attackunits, ..) was tuned together. Additionally for attack units a
finer granularity (factor 4) is used.
STC
ELO: 9.22 +-3.1 (95%) LOS: 100.0%
Total: 19514 W: 4340 L: 3822 D: 11352
LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 6399 W: 1192 L: 1056 D: 4151
Bench: 8224782
Resolves #184
2015-01-03 03:33:02 +08:00
Stefan Geschwentner and Gary Linscott
3231038262
Big King Safety tuning
...
ShelterWeakness and Stormdanger array are now indexed additionally by
file pair (a/h,b/g,c/f,d/e). The special case of king blocking a pawn
is incorporated in the StormDanger array. Finally the 93 parameters
are tuned by SPSA on LTC.
STC
ELO: 3.46 +-2.2 (95%) LOS: 99.9%
Total: 40000 W: 8275 L: 7877 D: 23848
LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 10311 W: 1876 L: 1721 D: 6714
Bench: 9498821
Resolves #163
2014-12-21 01:53:44 +08:00
