def is_lg_castling_ok(match, srcx, srcy, dstx, dsty, piece):
color = Match.color_of_piece(piece)
opp_color = Match.REVERSED_COLORS[color]
for i in range(1, 3, 1):
fieldx = srcx - i
field = match.readfield(fieldx, srcy)
if(field != Match.PIECES['blk']):
return False
if(color == Match.COLORS['white']):
if(match.wKg_first_movecnt != 0 or match.wRk_a1_first_movecnt != 0):
return False
else:
if(match.bKg_first_movecnt != 0 or match.bRk_a8_first_movecnt != 0):
return False
king = match.readfield(srcx, srcy)
match.writefield(srcx, srcy, Match.PIECES['blk'])
for i in range(0, -3, -1):
castlingx = srcx + i
attacked = rules.attacked(match, castlingx, srcy, opp_color)
if(attacked == True):
match.writefield(srcx, srcy, king)
return False
match.writefield(srcx, srcy, king)
return True
def is_move_ok(match, srcx, srcy, dstx, dsty, piece):
DIRS = rules.DIRS
color = Match.color_of_piece(piece)
opp_color = Match.REVERSED_COLORS[color]
direction = kg_dir(srcx, srcy, dstx, dsty)
if(direction == DIRS['sh-castling']):
return is_sh_castling_ok(match, srcx, srcy, dstx, dsty, piece)
if(direction == DIRS['lg-castling']):
return is_lg_castling_ok(match, srcx, srcy, dstx, dsty, piece)
if(direction == DIRS['undefined']):
return False
king = match.readfield(srcx, srcy)
captured = match.readfield(dstx, dsty)
match.writefield(srcx, srcy, Match.PIECES['blk'])
match.writefield(dstx, dsty, king)
attacked = rules.attacked(match, dstx, dsty, opp_color)
match.writefield(srcx, srcy, king)
match.writefield(dstx, dsty, captured)
if(attacked == True):
return False
field = match.readfield(dstx, dsty)
if(match.color_of_piece(field) == color):
return False
return True
def calc_min(match, maxdepth, depth, alpha, beta):
generator = Generator()
generator.match = match
gmove = None
color = match.next_color()
newscore = None
minscore = 200000
oldscore = 0
count = 0
while(generator.active):
flag, newgmove = generator.generate_move()
if(flag):
count += 1
oldscore = match.score
move = match.do_move(newgmove.srcx, newgmove.srcy, newgmove.dstx, newgmove.dsty, newgmove.prom_piece)
match.move_list.append(move)
if(depth == 1):
msg = "\nmatch.id:" + str(match.id) + " calculate "
prnt_move(msg, newgmove)
if(gmove):
prnt_move(" CANDIDATE ", gmove)
print(" score: " + str(newscore))
thread = Match.get_active_thread(match)
if(thread and newscore):
thread.populate_candiate(gmove)
if(depth <= maxdepth):
newscore = calc_max(match, maxdepth, depth + 1, alpha, minscore)[0]
elif(depth <= maxdepth + 2):
if(match.next_color() == Match.COLORS['white']):
wkg_attacked = rules.attacked(match, match.wKg_x, match.wKg_y, Match.COLORS['black'])
white_promotion = match.readfield(newgmove.dstx, newgmove.dsty) == Match.PIECES['wPw'] and newgmove.dsty >= 6
if(oldscore != match.score or wkg_attacked or white_promotion ):
newscore = calc_max(match, maxdepth, depth + 1, alpha, minscore)[0]
else:
newscore = match.score + calc_helper.evaluate_position(match)
else:
bkg_attacked = rules.attacked(match, match.bKg_x, match.bKg_y, Match.COLORS['white'])
black_promotion = match.readfield(newgmove.dstx, newgmove.dsty) == Match.PIECES['bPw'] and newgmove.dsty <= 1
if(oldscore != match.score or bkg_attacked or black_promotion):
newscore = calc_max(match, maxdepth, depth + 1, alpha, minscore)[0]
else:
newscore = match.score + calc_helper.evaluate_position(match)
elif(depth <= maxdepth + 4 and oldscore != match.score):
newscore = calc_max(match, maxdepth, depth + 1, alpha, minscore)[0]
else:
newscore = match.score + calc_helper.evaluate_position(match)
newscore, gmove = rate(color, gmove, newgmove, minscore, newscore)
match.undo_move(True)
if(newscore < minscore):
minscore = newscore
if(minscore <= alpha):
break
else:
if(count == 0):
status = rules.game_status(match)
if(status == Match.STATUS['winner_black']):
newscore = Match.SCORES[Match.PIECES['wKg']]
elif(status == Match.STATUS['winner_white']):
newscore = Match.SCORES[Match.PIECES['bKg']]
elif(status == Match.STATUS['draw']):
newscore = Match.SCORES[Match.PIECES['blk']]
else:
newscore = match.score
if(depth == 1):
msg = "\nmatch.id:" + str(match.id) + " CANDIDATE "
prnt_move(msg, gmove)
print(" score: " + str(newscore))
thread = Match.get_active_thread(match)
if(thread):
thread.populate_candiate(gmove)
return newscore, gmove
return minscore, gmove