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2e91a8635468e40c89a2303ce50384864d088611
stockfish/src
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Stefan GeschwentnerandJoost VandeVondele 2e91a86354 Add log depth as term to reduction factors. 
Replace most reduction factors with a linear term of the form X + Y * msb(depth) (using msb(depth) as simple and fast approximation for log(depth))
and tune the weights with following SPSA test: https://tests.stockfishchess.org/tests/view/689903860049e8ccef9d6415.

Here the tuned values of X[8] and Y[8] were ignored because a simple test with this parameters alone failed badly (https://tests.stockfishchess.org/tests/view/68992b350049e8ccef9d6482).

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 32448 W: 8651 L: 8342 D: 15455
Ptnml(0-2): 81, 3695, 8408, 3914, 126
https://tests.stockfishchess.org/tests/view/6899489b0049e8ccef9d64ad

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 73854 W: 19042 L: 18649 D: 36163
Ptnml(0-2): 37, 7908, 20659, 8271, 52
https://tests.stockfishchess.org/tests/view/689abbe7fd8719b088c8d514

closes https://github.com/official-stockfish/Stockfish/pull/6229

Bench: 3151102
2025-08-16 11:51:39 +02:00
..
incbin
Update Incbin Library
2024-12-22 15:16:01 +01:00
nnue
Avoid using _mm512_storeu_epi16()
2025-08-16 11:46:39 +02:00
syzygy
Do not change TB cursed wins to draws if requested
2025-01-25 20:42:50 +01:00
benchmark.cpp
Update Copyright Year
2025-01-06 00:45:28 +01:00
benchmark.h
Update Copyright Year
2025-01-06 00:45:28 +01:00
bitboard.cpp
Remove pawn_attacks_bb()
2025-04-02 17:39:40 +02:00
bitboard.h
Remove code that is not used anywhere
2025-08-02 16:21:41 +02:00
engine.cpp
Allow more than 1024 threads on high-end machines
2025-03-21 11:17:59 +01:00
engine.h
Update Copyright Year
2025-01-06 00:45:28 +01:00
evaluate.cpp
Remove non-functional accumulator reset
2025-04-26 21:30:01 +02:00
evaluate.h
Various cleanups
2025-04-02 17:43:14 +02:00
history.h
Remove outdated comment
2025-08-09 09:04:33 +02:00
main.cpp
Update Copyright Year
2025-01-06 00:45:28 +01:00
Makefile
Only set ep square if ep capture is possible
2025-08-04 15:16:21 +02:00
memory.cpp
Update Copyright Year
2025-01-06 00:45:28 +01:00
memory.h
Remove unneeded return statement
2025-04-26 22:26:39 +02:00
misc.cpp
Speedup movegen with VBMI2
2025-07-24 10:08:35 +02:00
misc.h
Move SIMD code to a separate header
2025-05-25 20:52:57 +02:00
movegen.cpp
Speedup movegen with VBMI2
2025-07-24 10:08:35 +02:00
movegen.h
Speedup movegen with VBMI2
2025-07-24 10:08:35 +02:00
movepick.cpp
Refactor: Simplify pawn structure indexing
2025-08-04 14:56:03 +02:00
movepick.h
Speedup movegen with VBMI2
2025-07-24 10:08:35 +02:00
numa.h
Update Copyright Year
2025-01-06 00:45:28 +01:00
perft.h
Remove unnecessary deque allocation in perft
2025-07-28 20:05:26 +02:00
position.cpp
Only set ep square if ep capture is possible
2025-08-04 15:16:21 +02:00
position.h
Simplify Position::pieces()
2025-06-02 21:28:18 +02:00
score.cpp
Update Copyright Year
2025-01-06 00:45:28 +01:00
score.h
Update Copyright Year
2025-01-06 00:45:28 +01:00
search.cpp
Add log depth as term to reduction factors.
2025-08-16 11:51:39 +02:00
search.h
Tweak the logic for setting the improving flag
2025-07-28 19:45:13 +02:00
thread_win32_osx.h
Update Copyright Year
2025-01-06 00:45:28 +01:00
thread.cpp
Update Copyright Year
2025-01-06 00:45:28 +01:00
thread.h
Update clang-format to v20
2025-05-23 08:54:06 +02:00
timeman.cpp
Simplify sudden death time optimization
2025-07-02 18:41:46 +02:00
timeman.h
Shrink Enum Sizes
2025-05-19 07:17:39 +02:00
tt.cpp
Introduce Secondary TT Aging
2025-06-02 21:55:55 +02:00
tt.h
Silence clang-format issue
2025-02-02 13:49:54 +01:00
tune.cpp
Disallow same option being added twice
2025-02-04 21:18:01 +01:00
tune.h
Prevent accidential misuse of TUNE()
2025-07-24 10:28:17 +02:00
types.h
Small tt verify simplification
2025-06-02 21:15:56 +02:00
uci.cpp
Display upper/lowerbound before wdl
2025-08-02 15:54:10 +02:00
uci.h
Shrink Enum Sizes
2025-05-19 07:17:39 +02:00
ucioption.cpp
Disallow same option being added twice
2025-02-04 21:18:01 +01:00
ucioption.h
Disallow same option being added twice
2025-02-04 21:18:01 +01:00