def cook_mate(engine: SimpleEngine, node: ChildNode,
winner: Color) -> Optional[List[Move]]:
if node.board().is_game_over():
return []
pair = get_next_move(engine, node, winner)
if not pair:
return None
next = pair.best
if next.score < mate_soon:
logger.debug(
"Best move is not a mate, we're probably not searching deep enough"
)
return None
follow_up = cook_mate(engine, node.add_main_variation(next.move), winner)
if follow_up is None:
return None
return [next.move] + follow_up
def cook_mate(engine: SimpleEngine, node: ChildNode, winner: Color) -> Optional[List[Move]]:
board = node.board()
if board.is_game_over():
return []
if board.turn == winner:
pair = get_next_pair(engine, node, winner)
if not pair:
return None
if pair.best.score < mate_soon:
logger.debug("Best move is not a mate, we're probably not searching deep enough")
return None
move = pair.best.move
else:
next = get_next_move(engine, node, mate_defense_limit)
if not next:
return None
move = next
follow_up = cook_mate(engine, node.add_main_variation(move), winner)
if follow_up is None:
return None
return [move] + follow_up
def cook_advantage(engine: SimpleEngine, node: ChildNode,
winner: Color) -> Optional[List[NextMovePair]]:
if node.board().is_repetition(2):
logger.debug("Found repetition, canceling")
return None
next = get_next_move(engine, node, winner)
if not next:
logger.debug("No next move")
return []
if next.best.score.is_mate():
logger.debug("Expected advantage, got mate?!")
return None
if next.best.score < Cp(200):
logger.debug("Not winning enough, aborting")
return None
follow_up = cook_advantage(engine, node.add_main_variation(next.best.move),
winner)
if follow_up is None:
return None
return [next] + follow_up
def cook_advantage(engine: SimpleEngine, node: ChildNode, winner: Color) -> Optional[List[NextMovePair]]:
board = node.board()
if board.is_repetition(2):
logger.debug("Found repetition, canceling")
return None
pair = get_next_pair(engine, node, winner)
if not pair:
return []
if pair.best.score < Cp(200):
logger.debug("Not winning enough, aborting")
return None
follow_up = cook_advantage(engine, node.add_main_variation(pair.best.move), winner)
if follow_up is None:
return None
return [pair] + follow_up