256 lines
9.2 KiB
Python
256 lines
9.2 KiB
Python
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class IllegalMoveException(Exception):
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pass
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class Move:
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GTP_COORD = "ABCDEFGHJKLMNOPQRSTUVWYXYZ"
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PLAYERS = "BW"
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SGF_COORD = [chr(i) for i in range(97, 123)]
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def __init__(self, player, coords=None, gtpcoords=None, sgfcoords=None, robot=False):
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self.id = None
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self.player = player
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self.coords = coords or (gtpcoords and self.gtp2ix(gtpcoords)) or self.sgf2ix(sgfcoords)
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self.children = []
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self.parent = None
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self.robot = robot
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self.analysis = None
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self.pass_analysis = None
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self.outdated_evaluation = None
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self.evaluation = None
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self.ownership = None
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self.points_lost = 0
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self.previous_temperature = None
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self.comment = ""
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def __repr__(self):
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return f"{Move.PLAYERS[self.player]}{self.gtp()}"
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def __eq__(self, other):
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return self.coords == other.coords and self.player == other.player
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def __hash__(self):
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return self.gtp().__hash__()
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def play(self, move):
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try:
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return self.children[self.children.index(move)]
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except ValueError:
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move.parent = self
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self.children.append(move)
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return move
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def temperature(self):
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if self.analysis:
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best_score = float(self.analysis[0]["scoreLead"])
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worst_score = -float(self.pass_analysis[0]["scoreLead"])
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return best_score - worst_score
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else:
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return 0
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def set_analysis(self,analysis_blob,is_pass):
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if is_pass:
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self.pass_analysis = analysis_blob['moveInfos']
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else:
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self.analysis = analysis_blob['moveInfos']
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self.ownership = analysis_blob['ownership']
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if self.analysis and self.pass_analysis:
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if self.parent.analysis:
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self.evaluate()
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for cm in self.children:
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cm.evaluate()
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def evaluate(self):
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previous_move = self.parent
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best_score = float(previous_move.analysis[0]["scoreLead"])
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worst_score = -float(previous_move.pass_analysis[0]["scoreLead"])
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last_move_score = -float(self.analysis[0]["scoreLead"])
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self.previous_temperature = best_score - worst_score
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self.points_lost = best_score - last_move_score
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prev_analysis_current_move = [d for d in previous_move.analysis if d["move"] == self.gtp()]
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if abs(self.previous_temperature) > 0.5:
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self.evaluation = (last_move_score - worst_score) / (best_score - worst_score)
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self.move_options = [previous_move.analysis[0]["scoreLead"]]
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else:
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self.evaluation = None
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if self.evaluation:
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self.comment = f"Evaluation: {100*self.evaluation:.1f}%{' (AI Move)' if self.robot else ''}\n"
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if prev_analysis_current_move:
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self.outdated_evaluation = (prev_analysis_current_move[0]["scoreLead"] - worst_score) / (
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best_score - worst_score
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)
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self.comment += f"(Was considered last move as: {100 * self.outdated_evaluation:.1f}%)\n"
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else:
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self.comment = "Temperature too low for evaluation\n"
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self.comment += f"Estimate point loss: {self.points_lost:.1f}\n"
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self.comment += f"Last move score was {last_move_score:.1f}\n"
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self.comment += f"Score of top move was {previous_move.analysis[0]['scoreLead']:.1f} @ {previous_move.analysis[0]['move']}\n"
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self.comment += f"Pass score was {worst_score:.1f}\n"
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@property
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def is_pass(self):
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return self.coords[0] is None
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def gtp2ix(self, gtpmove):
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if "pass" in gtpmove:
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return (None, None)
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return Move.GTP_COORD.index(gtpmove[0]), int(gtpmove[1:]) - 1
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def sgf2ix(self, sgfmove_with_board_size):
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sgfmove, board_size = sgfmove_with_board_size
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if sgfmove == "":
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return (None, None)
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return Move.SGF_COORD.index(sgfmove[0]), board_size - Move.SGF_COORD.index(sgfmove[1]) - 1
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def gtp(self):
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if self.is_pass:
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return "pass"
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return Move.GTP_COORD[self.coords[0]] + str(self.coords[1] + 1)
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def sgfcoords(self, board_size):
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return f"{Move.SGF_COORD[self.coords[0]]}{Move.SGF_COORD[board_size - self.coords[1] - 1]}"
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def sgf(self, board_size):
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if self.is_pass:
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return f"{Move.PLAYERS[self.player]}[]"
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else:
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return f"{Move.PLAYERS[self.player]}[{self.sgfcoords(board_size)}]"
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class Board:
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_move_id_counter = 0 # used to make a map to all moves across all games
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def __init__(self, board_size=19):
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self.board_size = board_size
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self.root = Move(1, (None, None)) # root is 1=white so black is first
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self.root.id = -1
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self.current_move = self.root
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self.all_moves = {-1: self.root}
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self._init_chains()
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# -- move tree functions --
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def _init_chains(self):
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self.board = [[-1 for x in range(self.board_size)] for y in range(self.board_size)] # board pos -> chain id
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self.chains = [] # chain id -> chain
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self.prisoners = []
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self.last_capture = []
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try:
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for m in self.moves:
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self._validate_move_and_update_chains(m, True) # ignore ko since we didn't know if it was forced
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except IllegalMoveException as e:
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raise Exception(f"Unexpected illegal move ({str(e)})")
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def _validate_move_and_update_chains(self, move, ignore_ko):
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def neighbours(moves):
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return {
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self.board[m.coords[1] + dy][m.coords[0] + dx]
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for m in moves
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for dy, dx in [(-1, 0), (1, 0), (0, -1), (0, 1)]
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if 0 <= m.coords[0] + dx < self.board_size and 0 <= m.coords[1] + dy < self.board_size
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}
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ko_or_snapback = len(self.last_capture) == 1 and self.last_capture[0] == move
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self.last_capture = []
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if move.is_pass:
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return
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if self.board[move.coords[1]][move.coords[0]] != -1:
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raise IllegalMoveException("Space occupied")
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nb_chains = list({c for c in neighbours([move]) if c >= 0 and self.chains[c][0].player == move.player})
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if nb_chains:
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this_chain = nb_chains[0]
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self.board = [
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[nb_chains[0] if sq in nb_chains else sq for sq in line] for line in self.board
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] # merge chains connected by this move
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for oc in nb_chains[1:]:
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self.chains[nb_chains[0]] += self.chains[oc]
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self.chains[oc] = []
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self.chains[nb_chains[0]].append(move)
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else:
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this_chain = len(self.chains)
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self.chains.append([move])
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self.board[move.coords[1]][move.coords[0]] = this_chain
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opp_nb_chains = {c for c in neighbours([move]) if c >= 0 and self.chains[c][0].player != move.player}
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for c in opp_nb_chains:
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if -1 not in neighbours(self.chains[c]):
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self.last_capture += self.chains[c]
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for om in self.chains[c]:
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self.board[om.coords[1]][om.coords[0]] = -1
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self.chains[c] = []
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if ko_or_snapback and len(self.last_capture) == 1 and not ignore_ko:
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raise IllegalMoveException("Ko")
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self.prisoners += self.last_capture
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if -1 not in neighbours(self.chains[this_chain]):
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raise IllegalMoveException("Suicide")
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# Play a Move from the current position, returns false if invalid.
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def play(self, move, ignore_ko=False):
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try:
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self._validate_move_and_update_chains(move, ignore_ko)
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except IllegalMoveException as e:
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self._init_chains() # restore
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raise
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move = self.current_move.play(move) # traverse or append
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if not move.id:
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move.id = Board._move_id_counter
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Board._move_id_counter += 1
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self.all_moves[move.id] = move
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self.current_move = move
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return move
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def undo(self):
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if self.current_move != self.root:
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self.current_move = self.current_move.parent
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self._init_chains()
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@property
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def moves(self) -> list: # flat list of moves to current
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moves = []
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p = self.current_move
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while p != self.root:
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moves.append(p)
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p = p.parent
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return moves[::-1]
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@property
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def current_player(self):
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return 1 - self.current_move.player
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# --analysis
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def store_analysis(self, json):
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if json["id"].startswith("PASS_"):
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id = int(json["id"].lstrip("PASS_"))
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is_pass = True
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else:
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id = int(json["id"])
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is_pass = False
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move = self.all_moves.get(id)
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if move: # else this should be old
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move.set_analysis(json,is_pass)
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else:
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print("WARNING: ORPHANED ANALYSIS FOUND - RECENT NEW GAME?")
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# -- board visualization etc
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# ko: single capture and
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# other not allowed: suicide
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@property
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def stones(self):
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return sum(self.chains, [])
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def sgf(self):
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return "SGF[]"
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def __str__(self):
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return (
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"\n".join("".join("BW"[self.chains[c][0].player] if c >= 0 else "-" for c in l) for l in self.board)
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+ f"\ncaptures: {self.prisoners}"
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)
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