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Joost VandeVondele 2c5f0efa13 Extend irreversible moves 
if these are ttMoves and played in positions with a high value of the rule50 counter. The unusual extension of 2 is safe in this context as awarding it will reset the rule50 counter, making sure it is awarded very rarely in a search path.

This patch partially addresses https://github.com/official-stockfish/Stockfish/issues/2620 as it should make it less likely to play a move that resets the counter, but that is worse than alternative moves after a slightly deeper search.

passed STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 71658 W: 13840 L: 13560 D: 44258
Ptnml(0-2): 1058, 7921, 17643, 8097, 1110
https://tests.stockfishchess.org/tests/view/5e90d0f6754c3424c4cf9f41

passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 85082 W: 11069 L: 10680 D: 63333
Ptnml(0-2): 459, 6982, 27259, 7393, 448
https://tests.stockfishchess.org/tests/view/5e917470af0a0143109dc341

closes https://github.com/official-stockfish/Stockfish/pull/2623

Bench: 4432822
2020-04-12 20:38:47 +02:00
..
syzygy
Small cleanups
2020-04-12 20:30:08 +02:00
benchmark.cpp
Equations for edges and corners.
2020-03-09 22:16:26 +01:00
bitbase.cpp
Small cleanups.
2020-02-05 15:32:29 +01:00
bitboard.cpp
Small cleanups
2020-04-12 20:30:08 +02:00
bitboard.h
Small cleanups
2020-04-12 20:30:08 +02:00
endgame.cpp
remove KNPK endgame code
2020-04-05 08:35:31 +02:00
endgame.h
remove KNPK endgame code
2020-04-05 08:35:31 +02:00
evaluate.cpp
Small cleanups
2020-04-12 20:30:08 +02:00
evaluate.h
Small cleanups
2020-03-01 09:31:58 +01:00
main.cpp
Small cleanups.
2020-02-05 15:32:29 +01:00
Makefile
Small cleanups
2020-03-01 09:31:58 +01:00
material.cpp
Small cleanups
2020-03-30 22:46:07 +02:00
material.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
misc.cpp
Small cleanups.
2020-02-05 15:32:29 +01:00
misc.h
Fix ambiguity between clamp implementations
2020-03-07 11:14:27 +01:00
movegen.cpp
Small cleanups
2020-04-12 20:30:08 +02:00
movegen.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
movepick.cpp
Always remember the ttMove
2020-04-12 20:34:50 +02:00
movepick.h
Improve move order near the root
2020-02-22 21:32:32 +01:00
pawns.cpp
Small cleanups
2020-04-12 20:30:08 +02:00
pawns.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
position.cpp
Small cleanups
2020-03-30 22:46:07 +02:00
position.h
Limit array access in Position
2020-04-02 14:40:03 +02:00
psqt.cpp
Small cleanups
2020-04-12 20:30:08 +02:00
search.cpp
Extend irreversible moves
2020-04-12 20:38:47 +02:00
search.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
thread_win32_osx.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
thread.cpp
Small cleanups
2020-04-12 20:30:08 +02:00
thread.h
Small cleanups
2020-04-12 20:30:08 +02:00
timeman.cpp
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
timeman.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
tt.cpp
Small cleanups.
2020-02-05 15:32:29 +01:00
tt.h
Small cleanups
2020-03-14 17:04:50 +01:00
types.h
Small cleanups
2020-04-12 20:30:08 +02:00
uci.cpp
Small cleanups
2020-03-30 22:46:07 +02:00
uci.h
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00
ucioption.cpp
Update lists of authors and contributors
2020-01-09 01:43:47 +01:00