/usr/share/pyshared/pychess/Variants/asymmetricrandom.py is in pychess 0.12~beta3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | # AsymmetricRandom Chess
import random
from pychess.Utils.const import *
from pychess.Utils.Board import Board
class AsymmetricRandomBoard(Board):
variant = ASYMMETRICRANDOMCHESS
def __init__ (self, setup=False):
if setup is True:
Board.__init__(self, setup=self.asymmetricrandom_start())
else:
Board.__init__(self, setup=setup)
def asymmetricrandom_start(self):
white = random.sample(('r', 'n', 'b', 'q')*16, 7)
white.append('k')
black = white[:]
random.shuffle(white)
random.shuffle(black)
# balance the bishops (put them on equal numbers of dark and light squares)
whitedarkbishops = 0
whitelightbishops = 0
for index, piece in enumerate(white):
if piece == 'b':
if index % 2 == 0: # even numbered square on the A rank are dark
whitedarkbishops += 1
else:
whitelightbishops += 1
blackdarkbishops = 0
blacklightbishops = 0
blackbishoprandomindexstack = []
for index, piece in enumerate(black):
if piece == 'b':
if index % 2 == 1: # odd numbered squares on the H rank are dark
blackdarkbishops += 1
else:
blacklightbishops += 1
blackbishoprandomindexstack.append(index)
random.shuffle(blackbishoprandomindexstack)
class RandomEnumeratePieces:
def __init__ (self, pieces):
self.pieces = pieces[:]
self.randomindexstack = range(8)
random.shuffle(self.randomindexstack)
def __iter__ (self):
return self
def next(self):
if not self.randomindexstack:
raise StopIteration
else:
randomindex = self.randomindexstack.pop()
return randomindex, self.pieces[randomindex]
while (whitedarkbishops != blackdarkbishops) or \
(whitelightbishops != blacklightbishops):
bishopindex = blackbishoprandomindexstack.pop()
for index, piece in RandomEnumeratePieces(black):
if piece != 'b':
if ((blackdarkbishops > whitedarkbishops) and \
(bishopindex % 2 == 1) and (index % 2 == 0)):
black[bishopindex] = piece
black[index] = 'b'
blacklightbishops += 1
blackdarkbishops = blackdarkbishops > 0 and (blackdarkbishops-1) or 0
break
elif ((blacklightbishops > whitelightbishops) and \
(bishopindex % 2 == 0) and (index % 2 == 1)):
black[bishopindex] = piece
black[index] = 'b'
blackdarkbishops += 1
blacklightbishops = blacklightbishops > 0 and (blacklightbishops-1) or 0
break
tmp = ''.join(black) + '/pppppppp/8/8/8/8/PPPPPPPP/' + \
''.join(white).upper() + ' w - - 0 1'
return tmp
class AsymmetricRandomChess:
__desc__ = \
_("FICS wild/4: http://www.freechess.org/Help/HelpFiles/wild.html\n" +
"* Randomly chosen pieces (two queens or three rooks possible)\n" +
"* Exactly one king of each color\n" +
"* Pieces placed randomly behind the pawns, SUBJECT TO THE CONSTRAINT THAT THE BISHOPS ARE BALANCED\n" +
"* No castling\n" +
"* Black's arrangement DOES NOT mirrors white's")
name = _("Asymmetric Random")
cecp_name = "unknown"
board = AsymmetricRandomBoard
need_initial_board = True
standard_rules = True
variant_group = VARIANTS_SHUFFLE
if __name__ == '__main__':
Board = AsymmetricRandomBoard(True)
for i in range(10):
print Board.asymmetricrandom_start()
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