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J. Oster a260c9a8a2 Fix incorrect pruning in qsearch 
Only do countermove based pruning in qsearch if we already have a move with a better score than a TB loss.

This patch fixes a bug (started as 843a961) that incorrectly prunes moves if in check,
and adds an assert to make sure no wrong mate scores are given in the future.
It replaces a no-op moveCount check with a check for bestValue.

Initially discussed in #3171 and later in #3199, #3198 and #3210.
This PR effectively closes #3171
It also likely fixes #3196 where this causes user visible incorrect TB scores,
which probably result from these incorrect mate scores.

Passed STC and LTC non-regression tests.
https://tests.stockfishchess.org/tests/view/5f9ef8dabca9bf35bae7f648
LLR: 2.93 (-2.94,2.94) {-1.25,0.25}
Total: 21672 W: 2339 L: 2230 D: 17103
Ptnml(0-2): 126, 1689, 7083, 1826, 112

https://tests.stockfishchess.org/tests/view/5f9f0caebca9bf35bae7f666
LLR: 2.97 (-2.94,2.94) {-0.75,0.25}
Total: 33152 W: 1551 L: 1485 D: 30116
Ptnml(0-2): 27, 1308, 13832, 1390, 19

closes https://github.com/official-stockfish/Stockfish/pull/3214

Bench: 3625915
2020-11-02 19:41:17 +01:00
..
incbin
Embed default net, and simplify using non-default nets
2020-08-29 21:56:00 +02:00
nnue
Optimize affine transform for SSSE3 and higher targets.
2020-11-02 19:41:17 +01:00
syzygy
Only use MADV_RANDOM if defined
2020-09-02 07:32:10 +02:00
benchmark.cpp
Always re-enable NNUE after "bench".
2020-09-08 22:53:50 +02:00
bitbase.cpp
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
bitboard.cpp
Small trivial cleanups
2020-08-23 01:53:41 +02:00
bitboard.h
Small trivial cleanups
2020-08-23 01:53:41 +02:00
endgame.cpp
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
endgame.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
evaluate.cpp
Elo Worth in King Danger
2020-11-02 19:41:17 +01:00
evaluate.h
Update default net to nn-cb26f10b1fd9.nnue
2020-11-01 08:02:40 +01:00
main.cpp
Small cleanups 12
2020-09-21 10:41:10 +02:00
Makefile
Add net as dependency of config
2020-10-22 20:18:12 +02:00
material.cpp
Small trivial cleanups
2020-08-23 01:53:41 +02:00
material.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
misc.cpp
Suppress info strings before 'uci'
2020-09-25 17:44:14 +02:00
misc.h
Add large page support for NNUE weights and simplify TT mem management
2020-09-21 08:43:48 +02:00
movegen.cpp
Small trivial cleanups
2020-08-23 01:53:41 +02:00
movegen.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
movepick.cpp
Do not skip non-recapture ttMove when in check
2020-10-28 23:40:37 +01:00
movepick.h
Introduce movecount pruning for qsearch()
2020-08-23 23:27:03 +02:00
pawns.cpp
Pawn Tuning
2020-10-05 19:01:46 +02:00
pawns.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
position.cpp
More incremental accumulator updates
2020-10-22 20:50:16 +02:00
position.h
Remove EvalList
2020-08-26 07:11:26 +02:00
psqt.cpp
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
search.cpp
Fix incorrect pruning in qsearch
2020-11-02 19:41:17 +01:00
search.h
Small cleanups 12
2020-09-21 10:41:10 +02:00
thread_win32_osx.h
Explicitly rely on pthreads if possible
2020-08-22 11:00:45 +02:00
thread.cpp
Small cleanups 12
2020-09-21 10:41:10 +02:00
thread.h
Do more reductions for late quiet moves in case of consecutive fail highs.
2020-10-18 13:54:28 +02:00
timeman.cpp
Reduce big time spikes by reducing PV re-searches.
2020-10-22 20:08:15 +02:00
timeman.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
tt.cpp
Add large page support for NNUE weights and simplify TT mem management
2020-09-21 08:43:48 +02:00
tt.h
Add large page support for NNUE weights and simplify TT mem management
2020-09-21 08:43:48 +02:00
tune.cpp
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
tune.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
types.h
Remove EvalList
2020-08-26 07:11:26 +02:00
uci.cpp
Small cleanups 12
2020-09-21 10:41:10 +02:00
uci.h
Add NNUE evaluation
2020-08-06 16:37:45 +02:00
ucioption.cpp
Small cleanups 12
2020-09-21 10:41:10 +02:00