Author: Vizvezdenec Date: Sun Dec 2 20:18:51 2018 +0100 Timestamp: 1543778331
Introduce concept of double pawn protection.
Exclude doubly protected by pawns squares when calculating attackers on king ring. Idea of this patch is not to count attackers if they attack only squares that are protected by two pawns.
Author: Miguel Lahoz Date: Sat Dec 1 11:28:10 2018 +0100 Timestamp: 1543660090
Penalize refuted killers in continuation history
Currently we apply a penalty in continuation history for refuted TT moves. We can use the same idea to also penalize refuted killer moves in continuation history.