Enhanced verify search (#1338)
authorGünther Demetz <guenther.demetz@wuerth-phoenix.com>
Mon, 18 Dec 2017 15:30:27 +0000 (16:30 +0100)
committerMarco Costalba <mcostalba@users.noreply.github.com>
Mon, 18 Dec 2017 15:30:27 +0000 (16:30 +0100)
commitb53239d6410cfc87bf454370671390b04879ef05
treeaf8647a9c39b7f81a22d67d2ec7a30fee6b167dd
parent83e829c9dc900dcb00d673417062f4193481ff36
Enhanced verify search (#1338)

by disabling null-move-pruning for the side to move for first part of
the remaining search tree. This helps to better recognize zugzwang.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 18220 W: 3379 L: 3253 D: 11588
http://tests.stockfishchess.org/tests/view/5a2fa6460ebc590ccbb8bc2f

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 41899 W: 5359 L: 5265 D: 31275
http://tests.stockfishchess.org/tests/view/5a2fcf440ebc590ccbb8bc47

For further detail see commit notes and discussion at
https://github.com/pb00068/Stockfish/commit/6401a80ab91df5c54390ac357409fef2e51ff5bb

bench: 5776193
src/search.cpp
src/thread.cpp
src/thread.h