Tweak multicut
This patch is an original patch by author of Altair
(https://github.com/Alex2262/AltairChessEngine) chess engine.
It allows to produce more aggressive multicut compared to master by changing
condition it needs to fulfil and also returns bigger value. Also has applied
matetrack fix on top.
Passed STC:
https://tests.stockfishchess.org/tests/view/667223ab602682471b0650e2
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 50048 W: 13200 L: 12860 D: 23988
Ptnml(0-2): 181, 5822, 12679, 6160, 182
Passed LTC:
https://tests.stockfishchess.org/tests/view/6672f777602682471b06515d
LLR: 2.97 (-2.94,2.94) <0.50,2.50>
Total: 706380 W: 179707 L: 177981 D: 348692
Ptnml(0-2): 656, 79250, 191665, 80950, 669
closes https://github.com/official-stockfish/Stockfish/pull/5421
bench 1148966