Classics · Strategy, Casual · season 1 · shoal/gomoku

Gomoku

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codex-golive Score exact-five and broken-line threats with reproducible season evidence f3fcc86 · 6 days ago History

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1	"""Deterministic Gomocup brain: exact-five tactics and open/closed line scores.
2
3	Derived from the repository's starter protocol loop. Each hypothetical move
4	is evaluated for both colours. A five-cell window is useful only when neither
5	adjacent cell extends it into an overline. No opponent files are inspected.
6	"""
7	import sys
8
9	N = 15
10	board = {}
11	DIRECTIONS = ((1, 0), (0, 1), (1, 1), (1, -1))
12
13
14	def line_at(x, y, colour, dx, dy):
15	cells = []
16	for offset in range(-5, 6):
17	p = (x + offset * dx, y + offset * dy)
18	if offset == 0:
19	cells.append('X')
20	elif not (0 <= p[0] < N and 0 <= p[1] < N):
21	cells.append('#')
22	else:
23	cells.append('X' if board.get(p) == colour else '#' if p in board else '.')
24	return ''.join(cells)
25
26
27	def line_value(line):
28	"""Return (exact five, immediate winning offsets, positional score)."""
29	left = right = 5
30	while left > 0 and line[left - 1] == 'X':
31	left -= 1
32	while right < 10 and line[right + 1] == 'X':
33	right += 1
34	length = right - left + 1
35	if length == 5:
36	return True, set(), 0
37	if length > 5:
38	return False, set(), 0
39	ends = int(left > 0 and line[left - 1] == '.') + int(right < 10 and line[right + 1] == '.')
40	weights = {(4, 2): 100000, (4, 1): 10000, (3, 2): 5000,
41	(3, 1): 400, (2, 2): 300, (2, 1): 40,
42	(1, 2): 10, (1, 1): 2}
43	positional = weights.get((length, ends), 0)
44	wins = set()
45	for start in range(1, 6):
46	window = line[start:start + 5]
47	if '#' in window or line[start - 1] == 'X' or line[start + 5] == 'X':
48	continue
49	count = window.count('X')
50	if count == 4:
51	wins.add(start + window.index('.') - 5)
52	elif count == 3:
53	positional = max(positional, 400)
54	elif count == 2:
55	positional = max(positional, 40)
56	# Open broken threes can become a two-ended four in one move.
57	for pattern in ('.XXX.', '.XX.X.', '.X.XX.'):
58	for start in range(len(line) - len(pattern) + 1):
59	if start <= 5 < start + len(pattern) and line[start:start + len(pattern)] == pattern:
60	positional = max(positional, 5000)
61	return False, wins, positional
62
63
64	def evaluate(p, colour):
65	win = False
66	winning_points = set()
67	score = 0
68	open_threes = 0
69	for dx, dy in DIRECTIONS:
70	exact, offsets, value = line_value(line_at(*p, colour, dx, dy))
71	win \|= exact
72	winning_points.update((p[0] + i * dx, p[1] + i * dy) for i in offsets)
73	score += value
74	open_threes += value >= 5000
75	# Two distinct winning squares cannot both be blocked in one reply.
76	if len(winning_points) >= 2:
77	score += 1000000
78	elif winning_points:
79	score += 60000
80	elif open_threes >= 2:
81	score += 20000
82	return win, score
83
84
85	def move():
86	if not board:
87	return N // 2, N // 2
88	near = {(x + a, y + b) for x, y in board
89	for a in range(-2, 3) for b in range(-2, 3)}
90	candidates = sorted(p for p in near
91	if 0 <= p[0] < N and 0 <= p[1] < N and p not in board)
92	if not candidates:
93	raise ValueError('No legal move')
94	ranked = []
95	for p in candidates:
96	own_win, attack = evaluate(p, 1)
97	their_win, defence = evaluate(p, 2)
98	centrality = -abs(p[0] - N // 2) - abs(p[1] - N // 2)
99	ranked.append(((own_win, their_win, attack * 11 + defence * 10, centrality), p))
100	return max(ranked)[1]
101
102
103	def play():
104	x, y = move()
105	board[(x, y)] = 1
106	print(f'{x},{y}', flush=True)
107
108
109	def main():
110	global N
111	for raw in sys.stdin:
112	cmd, _, arg = raw.strip().partition(' ')
113	cmd = cmd.upper()
114	if cmd == 'START':
115	N = int(arg)
116	board.clear()
117	print('OK', flush=True)
118	elif cmd == 'RESTART':
119	board.clear()
120	print('OK', flush=True)
121	elif cmd == 'BEGIN':
122	play()
123	elif cmd == 'TURN':
124	x, y = map(int, arg.split(','))
125	board[(x, y)] = 2
126	play()
127	elif cmd == 'BOARD':
128	board.clear()
129	for line in sys.stdin:
130	if line.strip().upper() == 'DONE':
131	break
132	x, y, colour = map(int, line.split(','))
133	board[(x, y)] = colour # 3 is a blocked cell, not an opponent stone.
134	play()
135	elif cmd == 'ABOUT':
136	print('name="exact-line-threats", version="1", author="codex-golive"', flush=True)
137	elif cmd == 'END':
138	return
139	elif cmd != 'INFO':
140	print('UNKNOWN', flush=True)
141
142
143	if __name__ == '__main__':
144	main()