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python 五子棋AI实现（2）：棋型评估函数实现
五子棋基本棋型介绍
参考资料：http://game.onegreen.net/wzq/HTML/142336.html
最常见的基本棋型大体有以下几种：连五，活四，冲四，活三，眠三，活二，眠二。
① 连五：顾名思义，五颗同色棋子连在一起，不需要多讲。
图2-1
② 活四：有两个连五点（即有两个点可以形成五），图中白点即为连五点。
稍微思考一下就能发现活四出现的时候，如果对方单纯过来防守的话，是已经无法阻止自己连五了。
图2-2
③ 冲四：有一个连五点，如下面三图，均为冲四棋型。图中白点为连五点。
相对比活四来说，冲四的威胁性就小了很多，因为这个时候，对方只要跟着防守在那个唯一的连五点上，冲四就没法形成连五。
图2-3
图2-4
图2-5
④ 活三：可以形成活四的三，如下图，代表两种最基本的活三棋型。图中白点为活四点。
活三棋型是我们进攻中最常见的一种，因为活三之后，如果对方不以理会，将可以下一手将活三变成活四，而我们知道活四是已经无法单纯防守住了。所以，当我们面对活三的时候，需要非常谨慎对待。在自己没有更好的进攻手段的情况下，需要对其进行防守，以防止其形成可怕的活四棋型。
图2-6 
图2-7 
其中图2-7中间跳着一格的活三，也可以叫做跳活三。
⑤ 眠三：只能够形成冲四的三，如下各图，分别代表最基础的六种眠三形状。图中白点代表冲四点。眠三的棋型与活三的棋型相比，危险系数下降不少，因为眠三棋型即使不去防守，下一手它也只能形成冲四，而对于单纯的冲四棋型，我们知道，是可以防守住的。
图2-8 
图2-9 
图2-10 
图2-11
图2-12 
图2-13 
如上所示，眠三的形状是很丰富的。对于初学者，在下棋过程中，很容易忽略不常见的眠三形状，例如图2-13所示的眠三。
有新手学了活三眠三后，会提出疑问，说活三也可以形成冲四啊，那岂不是也可以叫眠三？
会提出这个问题，说明对眠三定义看得不够仔细：眠三的的定义是，只能够形成冲四的三。而活三可以形成眠三，但也能够形成活四。
此外，在五子棋中，活四棋型比冲四棋型具有更大的优势，所以，我们在既能够形成活四又能够形成冲四时，会选择形成活四。
温馨提示：学会判断一个三到底是活三还是眠三是非常重要的。所以，需要好好体会。
后边禁手判断的时候也会有所应用。
⑥ 活二：能够形成活三的二，如下图，是三种基本的活二棋型。图中白点为活三点。
活二棋型看起来似乎很无害，因为他下一手棋才能形成活三，等形成活三，我们再防守也不迟。但其实活二棋型是非常重要的，尤其是在开局阶段，我们形成较多的活二棋型的话，当我们将活二变成活三时，才能够令自己的活三绵绵不绝微风里，让对手防不胜防。
图2-14 
图2-15 
图2-16 
⑦眠二：能够形成眠三的二。图中四个为最基本的眠二棋型，细心且喜欢思考的同学会根据眠三介绍中的图2-13找到与下列四个基本眠二棋型都不一样的眠二。图中白点为眠三点。
图2-17 
图2-18 
图2-19 
图2-20 
评估方法介绍
由上面的介绍可知，有7种有效的棋型（连五，活四，冲四，活三，眠三，活二，眠二），我们可以创建黑棋和白棋两个数组，记录棋盘上黑棋和白棋分别形成的所有棋型的个数，然后按照一定的规则进行评分。
如何记录棋盘上的棋形个数，一个很直观的方法是，棋盘上有15条水平线，15条竖直线，不考虑长度小于5的斜线，有21条从左上到右下的斜线，21条从左下到右上的斜线。然后对每一条线分别对黑棋和白棋查找是否有符合的棋型。这种方法比较直观，但是实现起来不方便。有兴趣的可以尝试下。
这里用的方法是，对整个棋盘进行遍历，对于每一个白棋或黑棋，以它为中心，记录符合的棋型个数。
具体实现方式如下：
-
遍历棋盘上的每个点，如果是黑棋或白旗，则对这个点所在四个方向形成的四条线分别进行评估。四个方向即水平，竖直，两个斜线( \ , / ），四个方向依次按照从左到右， 从上到下，从左上到右下，从左下到右上 来检测。
-
对于具体的一条线，如下图，已选取点为中心，取该方向上前面四个点，后面四个点，组成一个长度为9的数组。
然后找下和中心点相连的同色棋子有几个，比如下图，相连的白色棋子有3个，根据相连棋子的个数再分别进行判断，最后得出这行属于上面说的哪一种棋型。具体判断可以看代码中的 analysisLine 函数.
这里有个注意点，在评估白旗1的时候，白棋3和5已经被判断过，所以要标记下，下次遍历到这个方向的白棋3和5，需要跳过，避免重复统计棋型。
-
根据棋盘上黑棋和白棋的棋型统计信息，按照一定规则进行评分。
假设形成该棋局的最后一步是黑棋下的，则最后的评分是（黑棋得分 - 白棋得分），在相同棋型相同个数的情况下，白棋会占优，因为下一步是白棋下。比如黑棋有个冲四，白棋有个冲四，显然白棋占优，因为下一步白棋就能成连五。
按照下面的规则依次匹配，下面设的评分值是可以优化调整的：
前面9条为必杀情况，会直接返回评分，- 黑棋连5，评分为10000
- 白棋连5，评分为 -10000
- 黑棋两个冲四可以当成一个活四
- 白棋有活四，评分为 -9050
- 白棋有冲四，评分为 -9040
- 黑棋有活四，评分为 9030
- 黑棋有冲四和活三，评分为 9020
- 黑棋没有冲四，且白棋有活三，评分为 9010
- 黑棋有2个活三，且白棋没有活三或眠三，评分为 9000
- 下面针对黑棋或白棋的活三，眠三，活二，眠二的个数依次增加分数，评分为（黑棋得分 - 白棋得分）
简单AI介绍
有了评估函数，轮到AI下棋时，就要针对当前的棋局，找到一个最有利的位置来下。AI会尝试在每个空点下棋，形成一个新的棋局，然后用评估函数来获取这个棋局时的评分。从中选取评分最高的位置来就行了。
AI 获取最有利位置的逻辑：
- 遍历棋盘上的每一个空点：
在这个空点下棋，获取新的棋局的评分
如果是更高的评分，则保存该位置
将这个位置恢复为空点 - 获得最高评分的位置
上面这段逻辑我们在后续的文章中会不断优化，使得AI越来越厉害。
代码实现
AI的实现都在ChessAI类中，record数组记录所有位置的四个方向是否被检测过。count二维数组记录黑棋和白棋的棋型个数统计。pos_score 给棋盘上每个位置设一个初始分数，越靠近棋盘中心，分数越高，用来在最开始没有任何棋型时的，AI优先选取靠中心的位置。
reset函数每次调用评估函数前都需要清一下之前的统计数据。
class ChessAI():
def __init__(self, chess_len):
self.len = chess_len
# [horizon, vertical, left diagonal, right diagonal]
self.record = [[[0,0,0,0] for x in range(chess_len)] for y in range(chess_len)]
self.count = [[0 for x in range(CHESS_TYPE_NUM)] for i in range(2)]
self.pos_score = [[(7 - max(abs(x - 7), abs(y - 7))) for x in range(chess_len)] for y in range(chess_len)]
def reset(self):
for y in range(self.len):
for x in range(self.len):
for i in range(4):
self.record[y][x][i] = 0
for i in range(len(self.count)):
for j in range(len(self.count[0])):
self.count[i][j] = 0
self.save_count = 0
findBestChess 函数就是AI的入口函数。
search 函数是上面AI逻辑的代码实现，先通过 genmove 函数获取棋盘上所有的空点，然后依次尝试，获得评分最高的位置并返回。
# get all positions that is empty
def genmove(self, board, turn):
moves = []
for y in range(self.len):
for x in range(self.len):
if board[y][x] == 0:
score = self.pos_score[y][x]
moves.append((score, x, y))
moves.sort(reverse=True)
return moves
def search(self, board, turn):
moves = self.genmove(board, turn)
bestmove = None
max_score = -0x7fffffff
for score, x, y in moves:
board[y][x] = turn.value
score = self.evaluate(board, turn)
board[y][x] = 0
if score > max_score:
max_score = score
bestmove = (max_score, x, y)
return bestmove
def findBestChess(self, board, turn):
time1 = time.time()
score, x, y = self.search(board, turn)
time2 = time.time()
print('time[%f] (%d, %d), score[%d] save[%d]' % ((time2-time1), x, y, score, self.save_count))
return (x, y)
evaluate函数, 就是上面评估方法的代码实现，参数turn表示最近一手棋是谁下的，根据turn决定的mine（表示自己棋的值）和oppoent（表示对手棋的值，下一步棋由对手下），在对棋型评分时会用到。checkWin 是游戏用来判断是否有一方获胜了。
其中调用的getScore函数就是对黑棋和白棋进行评分。
evaluatePoint函数就是对于一个位置的四个方向分别进行检查。
def evaluate(self, board, turn, checkWin=False):
self.reset()
if turn == MAP_ENTRY_TYPE.MAP_PLAYER_ONE:
mine = 1
opponent = 2
else:
mine = 2
opponent = 1
for y in range(self.len):
for x in range(self.len):
if board[y][x] == mine:
self.evaluatePoint(board, x, y, mine, opponent)
elif board[y][x] == opponent:
self.evaluatePoint(board, x, y, opponent, mine)
mine_count = self.count[mine-1]
opponent_count = self.count[opponent-1]
if checkWin:
return mine_count[FIVE] > 0
else:
mscore, oscore = self.getScore(mine_count, opponent_count)
return (mscore - oscore)
def evaluatePoint(self, board, x, y, mine, opponent):
dir_offset = [(1, 0), (0, 1), (1, 1), (1, -1)] # direction from left to right
for i in range(4):
if self.record[y][x][i] == 0:
self.analysisLine(board, x, y, i, dir_offset[i], mine, opponent, self.count[mine-1])
else:
self.save_count += 1
analysisLine函数是判断一条线上自己棋能形成棋型的代码， mine表示自己棋的值，opponent表示对手棋的值。
要根据中心点相邻己方棋子能连成的个数来分别判断，己方棋值设为M，对方棋值设为P，空点值设为X。具体可以看代码中的注释。
- 连成5个点，可以直接返回
- 连成4个点，要考虑是否被对手棋档着，比如 PMMMMX
- 连成3个点，要考虑隔一个空点的情况，比如 MXMMMX。
- 连成2个点，要考虑隔一个空点的如情况，比如 MXMMX，MMXMM。
- 只有1个点，要考虑隔一个或二个空点的情况，比如 XMXMX，XMXXMX。
getLine函数，根据棋子的位置和方向，获取上面说的长度为9的线。有个取巧的地方，如果线上的位置超出了棋盘范围，就将这个位置的值设为对手的值，因为超出范围和被对手棋挡着，对棋型判断的结果是一样的。
setRecord函数 标记已经检测过，需要跳过的棋子。
# line is fixed len 9: XXXXMXXXX
def getLine(self, board, x, y, dir_offset, mine, opponent):
line = [0 for i in range(9)]
tmp_x = x + (-5 * dir_offset[0])
tmp_y = y + (-5 * dir_offset[1])
for i in range(9):
tmp_x += dir_offset[0]
tmp_y += dir_offset[1]
if (tmp_x < 0 or tmp_x >= self.len or
tmp_y < 0 or tmp_y >= self.len):
line[i] = opponent # set out of range as opponent chess
else:
line[i] = board[tmp_y][tmp_x]
return line
def analysisLine(self, board, x, y, dir_index, dir_offset, mine, opponent, count):
# record line range[left, right] as analysized
def setRecord(self, x, y, left, right, dir_index, dir_offset):
tmp_x = x + (-5 + left) * dir_offset[0]
tmp_y = y + (-5 + left) * dir_offset[1]
for i in range(left, right+1):
tmp_x += dir_offset[0]
tmp_y += dir_offset[1]
self.record[tmp_y][tmp_x][dir_index] = 1
empty = MAP_ENTRY_TYPE.MAP_EMPTY.value
left_idx, right_idx = 4, 4
line = self.getLine(board, x, y, dir_offset, mine, opponent)
while right_idx < 8:
if line[right_idx+1] != mine:
break
right_idx += 1
while left_idx > 0:
if line[left_idx-1] != mine:
break
left_idx -= 1
left_range, right_range = left_idx, right_idx
while right_range < 8:
if line[right_range+1] == opponent:
break
right_range += 1
while left_range > 0:
if line[left_range-1] == opponent:
break
left_range -= 1
chess_range = right_range - left_range + 1
if chess_range < 5:
setRecord(self, x, y, left_range, right_range, dir_index, dir)
return CHESS_TYPE.NONE
setRecord(self, x, y, left_idx, right_idx, dir_index, dir)
m_range = right_idx - left_idx + 1
# M:mine chess, P:opponent chess or out of range, X: empty
if m_range == 5:
count[FIVE] += 1
# Live Four : XMMMMX
# Chong Four : XMMMMP, PMMMMX
if m_range == 4:
left_empty = right_empty = False
if line[left_idx-1] == empty:
left_empty = True
if line[right_idx+1] == empty:
right_empty = True
if left_empty and right_empty:
count[FOUR] += 1
elif left_empty or right_empty:
count[SFOUR] += 1
# Chong Four : MXMMM, MMMXM, the two types can both exist
# Live Three : XMMMXX, XXMMMX
# Sleep Three : PMMMX, XMMMP, PXMMMXP
if m_range == 3:
left_empty = right_empty = False
left_four = right_four = False
if line[left_idx-1] == empty:
if line[left_idx-2] == mine: # MXMMM
setRecord(self, x, y, left_idx-2, left_idx-1, dir_index, dir)
count[SFOUR] += 1
left_four = True
left_empty = True
if line[right_idx+1] == empty:
if line[right_idx+2] == mine: # MMMXM
setRecord(self, x, y, right_idx+1, right_idx+2, dir_index, dir)
count[SFOUR] += 1
right_four = True
right_empty = True
if left_four or right_four:
pass
elif left_empty and right_empty:
if chess_range > 5: # XMMMXX, XXMMMX
count[THREE] += 1
else: # PXMMMXP
count[STHREE] += 1
elif left_empty or right_empty: # PMMMX, XMMMP
count[STHREE] += 1
# Chong Four: MMXMM, only check right direction
# Live Three: XMXMMX, XMMXMX the two types can both exist
# Sleep Three: PMXMMX, XMXMMP, PMMXMX, XMMXMP
# Live Two: XMMX
# Sleep Two: PMMX, XMMP
if m_range == 2:
left_empty = right_empty = False
left_three = right_three = False
if line[left_idx-1] == empty:
if line[left_idx-2] == mine:
setRecord(self, x, y, left_idx-2, left_idx-1, dir_index, dir)
if line[left_idx-3] == empty:
if line[right_idx+1] == empty: # XMXMMX
count[THREE] += 1
else: # XMXMMP
count[STHREE] += 1
left_three = True
elif line[left_idx-3] == opponent: # PMXMMX
if line[right_idx+1] == empty:
count[STHREE] += 1
left_three = True
left_empty = True
if line[right_idx+1] == empty:
if line[right_idx+2] == mine:
if line[right_idx+3] == mine: # MMXMM
setRecord(self, x, y, right_idx+1, right_idx+2, dir_index, dir)
count[SFOUR] += 1
right_three = True
elif line[right_idx+3] == empty:
#setRecord(self, x, y, right_idx+1, right_idx+2, dir_index, dir)
if left_empty: # XMMXMX
count[THREE] += 1
else: # PMMXMX
count[STHREE] += 1
right_three = True
elif left_empty: # XMMXMP
count[STHREE] += 1
right_three = True
right_empty = True
if left_three or right_three:
pass
elif left_empty and right_empty: # XMMX
count[TWO] += 1
elif left_empty or right_empty: # PMMX, XMMP
count[STWO] += 1
# Live Two: XMXMX, XMXXMX only check right direction
# Sleep Two: PMXMX, XMXMP
if m_range == 1:
left_empty = right_empty = False
if line[left_idx-1] == empty:
if line[left_idx-2] == mine:
if line[left_idx-3] == empty:
if line[right_idx+1] == opponent: # XMXMP
count[STWO] += 1
left_empty = True
if line[right_idx+1] == empty:
if line[right_idx+2] == mine:
if line[right_idx+3] == empty:
if left_empty: # XMXMX
#setRecord(self, x, y, left_idx, right_idx+2, dir_index, dir)
count[TWO] += 1
else: # PMXMX
count[STWO] += 1
elif line[right_idx+2] == empty:
if line[right_idx+3] == mine and line[right_idx+4] == empty: # XMXXMX
count[TWO] += 1
return CHESS_TYPE.NONE
完整代码
一共有三个文件，新增加了一个ChessAI.py。
main.py
增加了对于ChessAI类的 findBestChess 函数的调用，获取AI选择的下棋位置。
import pygame
from pygame.locals import *
from GameMap import *
from ChessAI import *
class Button():
def __init__(self, screen, text, x, y, color, enable):
self.screen = screen
self.width = BUTTON_WIDTH
self.height = BUTTON_HEIGHT
self.button_color = color
self.text_color = (255, 255, 255)
self.enable = enable
self.font = pygame.font.SysFont(None, BUTTON_HEIGHT*2//3)
self.rect = pygame.Rect(0, 0, self.width, self.height)
self.rect.topleft = (x, y)
self.text = text
self.init_msg()
def init_msg(self):
if self.enable:
self.msg_image = self.font.render(self.text, True, self.text_color, self.button_color[0])
else:
self.msg_image = self.font.render(self.text, True, self.text_color, self.button_color[1])
self.msg_image_rect = self.msg_image.get_rect()
self.msg_image_rect.center = self.rect.center
def draw(self):
if self.enable:
self.screen.fill(self.button_color[0], self.rect)
else:
self.screen.fill(self.button_color[1], self.rect)
self.screen.blit(self.msg_image, self.msg_image_rect)
class StartButton(Button):
def __init__(self, screen, text, x, y):
super().__init__(screen, text, x, y, [(26, 173, 25),(158, 217, 157)], True)
def click(self, game):
if self.enable:
game.start()
game.winner = None
self.msg_image = self.font.render(self.text, True, self.text_color, self.button_color[1])
self.enable = False
return True
return False
def unclick(self):
if not self.enable:
self.msg_image = self.font.render(self.text, True, self.text_color, self.button_color[0])
self.enable = True
class GiveupButton(Button):
def __init__(self, screen, text, x, y):
super().__init__(screen, text, x, y, [(230, 67, 64),(236, 139, 137)], False)
def click(self, game):
if self.enable:
game.is_play = False
if game.winner is None:
game.winner = game.map.reverseTurn(game.player)
self.msg_image = self.font.render(self.text, True, self.text_color, self.button_color[1])
self.enable = False
return True
return False
def unclick(self):
if not self.enable:
self.msg_image = self.font.render(self.text, True, self.text_color, self.button_color[0])
self.enable = True
class Game():
def __init__(self, caption):
pygame.init()
self.screen = pygame.display.set_mode([SCREEN_WIDTH, SCREEN_HEIGHT])
pygame.display.set_caption(caption)
self.clock = pygame.time.Clock()
self.buttons = []
self.buttons.append(StartButton(self.screen, 'Start', MAP_WIDTH + 30, 15))
self.buttons.append(GiveupButton(self.screen, 'Giveup', MAP_WIDTH + 30, BUTTON_HEIGHT + 45))
self.is_play = False
self.map = Map(CHESS_LEN, CHESS_LEN)
self.player = MAP_ENTRY_TYPE.MAP_PLAYER_ONE
self.action = None
self.AI = ChessAI(CHESS_LEN)
self.useAI = False
self.winner = None
def start(self):
self.is_play = True
self.player = MAP_ENTRY_TYPE.MAP_PLAYER_ONE
self.map.reset()
def play(self):
self.clock.tick(60)
light_yellow = (247, 238, 214)
pygame.draw.rect(self.screen, light_yellow, pygame.Rect(0, 0, MAP_WIDTH, SCREEN_HEIGHT))
pygame.draw.rect(self.screen, (255, 255, 255), pygame.Rect(MAP_WIDTH, 0, INFO_WIDTH, SCREEN_HEIGHT))
for button in self.buttons:
button.draw()
if self.is_play and not self.isOver():
if self.useAI:
x, y = self.AI.findBestChess(self.map.map, self.player)
self.checkClick(x, y, True)
self.useAI = False
if self.action is not None:
self.checkClick(self.action[0], self.action[1])
self.action = None
if not self.isOver():
self.changeMouseShow()
if self.isOver():
self.showWinner()
self.map.drawBackground(self.screen)
self.map.drawChess(self.screen)
def changeMouseShow(self):
map_x, map_y = pygame.mouse.get_pos()
x, y = self.map.MapPosToIndex(map_x, map_y)
if self.map.isInMap(map_x, map_y) and self.map.isEmpty(x, y):
pygame.mouse.set_visible(False)
light_red = (213, 90, 107)
pos, radius = (map_x, map_y), CHESS_RADIUS
pygame.draw.circle(self.screen, light_red, pos, radius)
else:
pygame.mouse.set_visible(True)
def checkClick(self,x, y, isAI=False):
self.map.click(x, y, self.player)
if self.AI.isWin(self.map.map, self.player):
self.winner = self.player
self.click_button(self.buttons[1])
else:
self.player = self.map.reverseTurn(self.player)
if not isAI:
self.useAI = True
def mouseClick(self, map_x, map_y):
if self.is_play and self.map.isInMap(map_x, map_y) and not self.isOver():
x, y = self.map.MapPosToIndex(map_x, map_y)
if self.map.isEmpty(x, y):
self.action = (x, y)
def isOver(self):
return self.winner is not None
def showWinner(self):
def showFont(screen, text, location_x, locaiton_y, height):
font = pygame.font.SysFont(None, height)
font_image = font.render(text, True, (0, 0, 255), (255, 255, 255))
font_image_rect = font_image.get_rect()
font_image_rect.x = location_x
font_image_rect.y = locaiton_y
screen.blit(font_image, font_image_rect)
if self.winner == MAP_ENTRY_TYPE.MAP_PLAYER_ONE:
str = 'Winner is White'
else:
str = 'Winner is Black'
showFont(self.screen, str, MAP_WIDTH + 25, SCREEN_HEIGHT - 60, 30)
pygame.mouse.set_visible(True)
def click_button(self, button):
if button.click(self):
for tmp in self.buttons:
if tmp != button:
tmp.unclick()
def check_buttons(self, mouse_x, mouse_y):
for button in self.buttons:
if button.rect.collidepoint(mouse_x, mouse_y):
self.click_button(button)
break
game = Game("FIVE CHESS " + GAME_VERSION)
while True:
game.play()
pygame.display.update()
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
elif event.type == pygame.MOUSEBUTTONDOWN:
mouse_x, mouse_y = pygame.mouse.get_pos()
game.mouseClick(mouse_x, mouse_y)
game.check_buttons(mouse_x, mouse_y)
GameMap.py
这个文件没有修改，可以直接使用上一篇中的代码。
ChessAI.py
AI实现的代码，这个AI目前很简单，只会思考一步，后续会增加思考的步数，比如2步或4步。
from GameMap import *
from enum import IntEnum
import copy
import time
class CHESS_TYPE(IntEnum):
NONE = 0,
SLEEP_TWO = 1,
LIVE_TWO = 2,
SLEEP_THREE = 3
LIVE_THREE = 4,
CHONG_FOUR = 5,
LIVE_FOUR = 6,
LIVE_FIVE = 7,
CHESS_TYPE_NUM = 8
FIVE = CHESS_TYPE.LIVE_FIVE.value
FOUR, THREE, TWO = CHESS_TYPE.LIVE_FOUR.value, CHESS_TYPE.LIVE_THREE.value, CHESS_TYPE.LIVE_TWO.value
SFOUR, STHREE, STWO = CHESS_TYPE.CHONG_FOUR.value, CHESS_TYPE.SLEEP_THREE.value, CHESS_TYPE.SLEEP_TWO.value
class ChessAI():
def __init__(self, chess_len):
self.len = chess_len
# [horizon, vertical, left diagonal, right diagonal]
self.record = [[[0,0,0,0] for x in range(chess_len)] for y in range(chess_len)]
self.count = [[0 for x in range(CHESS_TYPE_NUM)] for i in range(2)]
self.pos_score = [[(7 - max(abs(x - 7), abs(y - 7))) for x in range(chess_len)] for y in range(chess_len)]
def reset(self):
for y in range(self.len):
for x in range(self.len):
for i in range(4):
self.record[y][x][i] = 0
for i in range(len(self.count)):
for j in range(len(self.count[0])):
self.count[i][j] = 0
self.save_count = 0
def isWin(self, board, turn):
return self.evaluate(board, turn, True)
# get all positions that is empty
def genmove(self, board, turn):
moves = []
for y in range(self.len):
for x in range(self.len):
if board[y][x] == 0:
score = self.pos_score[y][x]
moves.append((score, x, y))
moves.sort(reverse=True)
return moves
def search(self, board, turn):
moves = self.genmove(board, turn)
bestmove = None
max_score = -0x7fffffff
for score, x, y in moves:
board[y][x] = turn.value
score = self.evaluate(board, turn)
board[y][x] = 0
if score > max_score:
max_score = score
bestmove = (max_score, x, y)
return bestmove
def findBestChess(self, board, turn):
time1 = time.time()
score, x, y = self.search(board, turn)
time2 = time.time()
print('time[%f] (%d, %d), score[%d] save[%d]' % ((time2-time1), x, y, score, self.save_count))
return (x, y)
# calculate score, FIXME: May Be Improved
def getScore(self, mine_count, opponent_count):
mscore, oscore = 0, 0
if mine_count[FIVE] > 0:
return (10000, 0)
if opponent_count[FIVE] > 0:
return (0, 10000)
if mine_count[SFOUR] >= 2:
mine_count[FOUR] += 1
if opponent_count[FOUR] > 0:
return (0, 9050)
if opponent_count[SFOUR] > 0:
return (0, 9040)
if mine_count[FOUR] > 0:
return (9030, 0)
if mine_count[SFOUR] > 0 and mine_count[THREE] > 0:
return (9020, 0)
if opponent_count[THREE] > 0 and mine_count[SFOUR] == 0:
return (0, 9010)
if (mine_count[THREE] > 1 and opponent_count[THREE] == 0 and opponent_count[STHREE] == 0):
return (9000, 0)
if mine_count[SFOUR] > 0:
mscore += 2000
if mine_count[THREE] > 1:
mscore += 500
elif mine_count[THREE] > 0:
mscore += 100
if opponent_count[THREE] > 1:
oscore += 2000
elif opponent_count[THREE] > 0:
oscore += 400
if mine_count[STHREE] > 0:
mscore += mine_count[STHREE] * 10
if opponent_count[STHREE] > 0:
oscore += opponent_count[STHREE] * 10
if mine_count[TWO] > 0:
mscore += mine_count[TWO] * 4
if opponent_count[TWO] > 0:
oscore += opponent_count[TWO] * 4
if mine_count[STWO] > 0:
mscore += mine_count[STWO] * 4
if opponent_count[STWO] > 0:
oscore += opponent_count[STWO] * 4
return (mscore, oscore)
def evaluate(self, board, turn, checkWin=False):
self.reset()
if turn == MAP_ENTRY_TYPE.MAP_PLAYER_ONE:
mine = 1
opponent = 2
else:
mine = 2
opponent = 1
for y in range(self.len):
for x in range(self.len):
if board[y][x] == mine:
self.evaluatePoint(board, x, y, mine, opponent)
elif board[y][x] == opponent:
self.evaluatePoint(board, x, y, opponent, mine)
mine_count = self.count[mine-1]
opponent_count = self.count[opponent-1]
if checkWin:
return mine_count[FIVE] > 0
else:
mscore, oscore = self.getScore(mine_count, opponent_count)
return (mscore - oscore)
def evaluatePoint(self, board, x, y, mine, opponent):
dir_offset = [(1, 0), (0, 1), (1, 1), (1, -1)] # direction from left to right
for i in range(4):
if self.record[y][x][i] == 0:
self.analysisLine(board, x, y, i, dir_offset[i], mine, opponent, self.count[mine-1])
else:
self.save_count += 1
# line is fixed len 9: XXXXMXXXX
def getLine(self, board, x, y, dir_offset, mine, opponent):
line = [0 for i in range(9)]
tmp_x = x + (-5 * dir_offset[0])
tmp_y = y + (-5 * dir_offset[1])
for i in range(9):
tmp_x += dir_offset[0]
tmp_y += dir_offset[1]
if (tmp_x < 0 or tmp_x >= self.len or
tmp_y < 0 or tmp_y >= self.len):
line[i] = opponent # set out of range as opponent chess
else:
line[i] = board[tmp_y][tmp_x]
return line
def analysisLine(self, board, x, y, dir_index, dir, mine, opponent, count):
def setRecord(self, x, y, left, right, dir_index, dir_offset):
tmp_x = x + (-5 + left) * dir_offset[0]
tmp_y = y + (-5 + left) * dir_offset[1]
for i in range(left, right):
tmp_x += dir_offset[0]
tmp_y += dir_offset[1]
self.record[tmp_y][tmp_x][dir_index] = 1
empty = MAP_ENTRY_TYPE.MAP_EMPTY.value
left_idx, right_idx = 4, 4
line = self.getLine(board, x, y, dir, mine, opponent)
while right_idx < 8:
if line[right_idx+1] != mine:
break
right_idx += 1
while left_idx > 0:
if line[left_idx-1] != mine:
break
left_idx -= 1
left_range, right_range = left_idx, right_idx
while right_range < 8:
if line[right_range+1] == opponent:
break
right_range += 1
while left_range > 0:
if line[left_range-1] == opponent:
break
left_range -= 1
chess_range = right_range - left_range + 1
if chess_range < 5:
setRecord(self, x, y, left_range, right_range, dir_index, dir)
return CHESS_TYPE.NONE
setRecord(self, x, y, left_idx, right_idx, dir_index, dir)
m_range = right_idx - left_idx + 1
# M:mine chess, P:opponent chess or out of range, X: empty
if m_range == 5:
count[FIVE] += 1
# Live Four : XMMMMX
# Chong Four : XMMMMP, PMMMMX
if m_range == 4:
left_empty = right_empty = False
if line[left_idx-1] == empty:
left_empty = True
if line[right_idx+1] == empty:
right_empty = True
if left_empty and right_empty:
count[FOUR] += 1
elif left_empty or right_empty:
count[SFOUR] += 1
# Chong Four : MXMMM, MMMXM, the two types can both exist
# Live Three : XMMMXX, XXMMMX
# Sleep Three : PMMMX, XMMMP, PXMMMXP
if m_range == 3:
left_empty = right_empty = False
left_four = right_four = False
if line[left_idx-1] == empty:
if line[left_idx-2] == mine: # MXMMM
setRecord(self, x, y, left_idx-2, left_idx-1, dir_index, dir)
count[SFOUR] += 1
left_four = True
left_empty = True
if line[right_idx+1] == empty:
if line[right_idx+2] == mine: # MMMXM
setRecord(self, x, y, right_idx+1, right_idx+2, dir_index, dir)
count[SFOUR] += 1
right_four = True
right_empty = True
if left_four or right_four:
pass
elif left_empty and right_empty:
if chess_range > 5: # XMMMXX, XXMMMX
count[THREE] += 1
else: # PXMMMXP
count[STHREE] += 1
elif left_empty or right_empty: # PMMMX, XMMMP
count[STHREE] += 1
# Chong Four: MMXMM, only check right direction
# Live Three: XMXMMX, XMMXMX the two types can both exist
# Sleep Three: PMXMMX, XMXMMP, PMMXMX, XMMXMP
# Live Two: XMMX
# Sleep Two: PMMX, XMMP
if m_range == 2:
left_empty = right_empty = False
left_three = right_three = False
if line[left_idx-1] == empty:
if line[left_idx-2] == mine:
setRecord(self, x, y, left_idx-2, left_idx-1, dir_index, dir)
if line[left_idx-3] == empty:
if line[right_idx+1] == empty: # XMXMMX
count[THREE] += 1
else: # XMXMMP
count[STHREE] += 1
left_three = True
elif line[left_idx-3] == opponent: # PMXMMX
if line[right_idx+1] == empty:
count[STHREE] += 1
left_three = True
left_empty = True
if line[right_idx+1] == empty:
if line[right_idx+2] == mine:
if line[right_idx+3] == mine: # MMXMM
setRecord(self, x, y, right_idx+1, right_idx+2, dir_index, dir)
count[SFOUR] += 1
right_three = True
elif line[right_idx+3] == empty:
#setRecord(self, x, y, right_idx+1, right_idx+2, dir_index, dir)
if left_empty: # XMMXMX
count[THREE] += 1
else: # PMMXMX
count[STHREE] += 1
right_three = True
elif left_empty: # XMMXMP
count[STHREE] += 1
right_three = True
right_empty = True
if left_three or right_three:
pass
elif left_empty and right_empty: # XMMX
count[TWO] += 1
elif left_empty or right_empty: # PMMX, XMMP
count[STWO] += 1
# Live Two: XMXMX, XMXXMX only check right direction
# Sleep Two: PMXMX, XMXMP
if m_range == 1:
left_empty = right_empty = False
if line[left_idx-1] == empty:
if line[left_idx-2] == mine:
if line[left_idx-3] == empty:
if line[right_idx+1] == opponent: # XMXMP
count[STWO] += 1
left_empty = True
if line[right_idx+1] == empty:
if line[right_idx+2] == mine:
if line[right_idx+3] == empty:
if left_empty: # XMXMX
#setRecord(self, x, y, left_idx, right_idx+2, dir_index, dir)
count[TWO] += 1
else: # PMXMX
count[STWO] += 1
elif line[right_idx+2] == empty:
if line[right_idx+3] == mine and line[right_idx+4] == empty: # XMXXMX
count[TWO] += 1
return CHESS_TYPE.NONE