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

Gomoku

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Weigh every point by the open and closed lines it makes and breaks
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1"""A Gomocup brain that weighs every empty point near the stones by the lines it would make for itself and the lines it
2would break for the other side (open and closed twos, threes and fours), and plays the heaviest."""
3import sys
4
5N, board, me = 15, {}, 1
6D = [(1, 0), (0, 1), (1, 1), (1, -1)]
7WEIGHT = {(5, 0): 1e7, (5, 1): 1e7, (5, 2): 1e7, (4, 2): 1e5, (4, 1): 1e4, (3, 2): 5e3, (3, 1): 400, (2, 2): 300, (2, 1): 40, (1, 2): 10, (1, 1): 2}
8
9
10def line(x, y, c, dx, dy):
11 n, ends = 1, 0
12 for s in (1, -1):
13 i = 1
14 while board.get((x + s * i * dx, y + s * i * dy)) == c:
15 n += 1
16 i += 1
17 a, b = x + s * i * dx, y + s * i * dy
18 if 0 <= a < N and 0 <= b < N and (a, b) not in board:
19 ends += 1
20 return min(n, 5), ends
21
22
23def value(x, y):
24 attack = sum(WEIGHT.get(line(x, y, me, dx, dy), 0) for dx, dy in D)
25 defend = sum(WEIGHT.get(line(x, y, 3 - me, dx, dy), 0) for dx, dy in D)
26 return attack * 1.1 + defend
27
28
29def move():
30 near = {(x + a, y + b) for (x, y) in board for a in (-2, -1, 0, 1, 2) for b in (-2, -1, 0, 1, 2)}
31 cands = [p for p in near if 0 <= p[0] < N and 0 <= p[1] < N and p not in board] or [(N // 2, N // 2)]
32 return max(cands, key=lambda p: (value(*p), -abs(p[0] - N // 2) - abs(p[1] - N // 2)))
33
34
35def play():
36 x, y = move()
37 board[(x, y)] = me
38 print(f'{x},{y}', flush=True)
39
40
41for raw in sys.stdin:
42 cmd, _, arg = raw.strip().partition(' ')
43 cmd = cmd.upper()
44 if cmd == 'START':
45 N = int(arg)
46 board.clear()
47 print('OK', flush=True)
48 elif cmd == 'BEGIN':
49 play()
50 elif cmd == 'TURN':
51 x, y = map(int, arg.split(','))
52 board[(x, y)] = 2
53 play()
54 elif cmd == 'BOARD':
55 for l in sys.stdin:
56 if l.strip().upper() == 'DONE':
57 break
58 x, y, f = map(int, l.split(','))
59 board[(x, y)] = 1 if f == 1 else 2
60 play()
61 elif cmd == 'ABOUT':
62 print('name="threats", version="1", author="shoal-games"', flush=True)
63 elif cmd == 'END':
64 break
65 elif cmd not in ('INFO', 'RESTART'):
66 print('UNKNOWN', flush=True)