Chess engine: Catto 0.5.0

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Catto - UCI chess engine
Author: Phu Minh  Rating CEDR=2316

 What do we currently have?
The engine
Negamax search algorithm with Alpha-Beta pruning.
Move ordering:
MVV-LVA heuristic.
Killer heuristic.
History heuristic.
Countermove heuristic.
Checkmate and stalemate detection.
Quiescence search.
Evalution:
PeSTO evaluation.
Pawn structure.
UCI.

v.0.5.0:
Added check extensions, extend search depth by 1 when king is in check.
Added one reply extensions, extend search depth by 1 when only one move is possible (likely forced).



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