def evaluate(self, board: chess.Board):
epd = board.epd()
if epd in self.cache:
policy, value = self.cache[epd]
return policy, value
else:
policy, value = self.net.evaluate(board)
self.cache[epd] = [policy, value]
return policy, value
def _evaluate_board(board: chess.Board):
"""Simple valuation function.
Just sums the piece values.
"""
pieces = board.epd().split()[0]
piece_values = {
'p': 1,
'n': 3,
'b': 3.25,
'k': 10000,
'q': 9,
'r': 5,
'P': -1,
'N': -3,
'B': -3.25,
'K': -10000,
'Q': -9,
'R': -5
}
return sum(piece_values.get(c, 0) for c in pieces)
