Adjust history threshold for quiet moves futility pruning
authorVizvezdenec <Vizvezdenec@gmail.com>
Sat, 13 Jun 2020 02:03:59 +0000 (05:03 +0300)
committerStéphane Nicolet <cassio@free.fr>
Sat, 13 Jun 2020 04:48:58 +0000 (06:48 +0200)
commitc44c62efc24fbe6355a9c19e287b2c78e6fd6c1d
treef5e56a9365ca0026eb3834cc00a3bc4016d8af6a
parent3af083a7cd9be1659f1d8a39a65e33b87608f762
Adjust history threshold for quiet moves futility pruning

This patch adjusts the threshold for futility pruning of quiet moves
using the continuation history array contHist[5], in the same way as
it is used in movepicker.

passed STC:
https://tests.stockfishchess.org/tests/view/5ee3f88bca6c451633a9959f
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 55984 W: 10822 L: 10552 D: 34610
Ptnml(0-2): 952, 6435, 12941, 6719, 945

passed LTC:
https://tests.stockfishchess.org/tests/view/5ee4186dca6c451633a995cf
LLR: 2.96 (-2.94,2.94) {0.25,1.75}
Total: 41712 W: 5402 L: 5114 D: 31196
Ptnml(0-2): 293, 3766, 12469, 4016, 312

closes https://github.com/official-stockfish/Stockfish/pull/2734

Bench: 4715960
src/search.cpp