Stockfish, chess engine UCILeader rating list JCER = 3405
🔬 Author: Joost VandeVondele
Copy killers in the movepicker
ss->killers can change while the movepicker is active.
The reason ss->killers changes is related to the singular
extension search in the moves loop that calls search<>
recursively with ss instead of ss+1,
effectively using the same stack entry for caller and callee.
By making a copy of the killers, the movepicker does the right thing nevertheless.
Tested as a bug fix
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 70845 W: 12752 L: 12716 D: 45377
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 28368 W: 3730 L: 3619 D: 21019
⭐⭐⭐ Stockfish 17042905 - download