On main thread: reduce depth after fail high #913
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This helps resolving consecutive FH's during aspiration more efficiently STC: http://tests.stockfishchess.org/tests/view/5bc857920ebc592439f85765 LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 4992 W: 1134 L: 980 D: 2878 Elo +10.72 LTC: http://tests.stockfishchess.org/tests/view/5bc868050ebc592439f857ef LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 8123 W: 1363 L: 1210 D: 5550 Elo +6.54 No-Regression test with 8 threads, tc=15+0.15: http://tests.stockfishchess.org/tests/view/5bc874ca0ebc592439f85938 LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 24740 W: 3977 L: 3863 D: 16900 Elo +1.60 This was a cooperation between me and Michael Stembera: -me recognizing SF having problems with resolving FH's efficiently at high depths, thus starting some tests based on consecutive FH's. -mstembera picking up the idea with first success at STC & LTC (so full credits to him!) -me suggesting how to resolve the issues pinpointed by S.G on PR official-stockfish#1768 and finally restricting the logic to the main thread so that it don't regresses at multi-thread. bench: 3314347
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This helps resolving consecutive FH's during aspiration more efficiently
STC:
http://tests.stockfishchess.org/tests/view/5bc857920ebc592439f85765
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 4992 W: 1134 L: 980 D: 2878 Elo +10.72
LTC:
http://tests.stockfishchess.org/tests/view/5bc868050ebc592439f857ef
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 8123 W: 1363 L: 1210 D: 5550 Elo +6.54
No-Regression test with 8 threads, tc=15+0.15:
http://tests.stockfishchess.org/tests/view/5bc874ca0ebc592439f85938
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 24740 W: 3977 L: 3863 D: 16900 Elo +1.60
This was a cooperation between me and Michael Stembera:
-me recognizing SF having problems with resolving FH's efficiently at
high depths, thus starting some tests based on consecutive FH's.
-mstembera picking up the idea with first success at STC & LTC (so full
credits to him!)
-me suggesting how to resolve the issues pinpointed by S.G on PR official-stockfish#1768
and finally restricting the logic to the main thread so that it don't
regresses at multi-thread.
bench: 3314347