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https://github.com/sockspls/badfish
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9953bfff62
Adjust criterion for applying extra reduction if not improving. We now add an extra ply of reduction if r > 1.0, instead of the previous condition Reductions[NonPV][imp][d][mc] >= 2. Why does this work? Previously, reductions when not improving had a discontinuity as the depth and/or move count increases due to the Reductions[NonPV][imp][d][mc] >= 2 condition. Hence, values of r such that 0.5 < r < 1.5 would be mapped to a reduction of 1, while 1.5 < r < 2.5 would be mapped to a reduction of 3. This patch allows values of r satisfying 1.0 < r < 1.5 to be mapped to a reduction of 2, making the reduction formula more continuous. STC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 35908 W: 7382 L: 7087 D: 21439 http://tests.stockfishchess.org/tests/view/5aba723a0ebc5902a4743e8f LTC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 23087 W: 3584 L: 3378 D: 16125 http://tests.stockfishchess.org/tests/view/5aba89070ebc5902a4743ea9 Ideas for future work: - We could look at retuning the LMR formula. - We could look at adjusting the reductions in PV nodes if not improving. Bench: 5326261 |
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| .. | ||
| syzygy | ||
| benchmark.cpp | ||
| bitbase.cpp | ||
| bitboard.cpp | ||
| bitboard.h | ||
| endgame.cpp | ||
| endgame.h | ||
| evaluate.cpp | ||
| evaluate.h | ||
| main.cpp | ||
| Makefile | ||
| material.cpp | ||
| material.h | ||
| misc.cpp | ||
| misc.h | ||
| movegen.cpp | ||
| movegen.h | ||
| movepick.cpp | ||
| movepick.h | ||
| pawns.cpp | ||
| pawns.h | ||
| position.cpp | ||
| position.h | ||
| psqt.cpp | ||
| search.cpp | ||
| search.h | ||
| thread.cpp | ||
| thread.h | ||
| thread_win32.h | ||
| timeman.cpp | ||
| timeman.h | ||
| tt.cpp | ||
| tt.h | ||
| types.h | ||
| uci.cpp | ||
| uci.h | ||
| ucioption.cpp | ||