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My solution solution in Clear category for Pawn Brotherhood by p3check
def safe_pawns(pawns):
safe = 0
for l, n in list(pawns):
if 1 < int(n):
if ("a" < l and (chr(ord(l) - 1) + str(int(n) - 1)) in pawns or
l < "h" and (chr(ord(l) + 1) + str(int(n) - 1)) in pawns):
safe += 1
return safe
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert safe_pawns({"b4", "d4", "f4", "c3", "e3", "g5", "d2"}) == 6
assert safe_pawns({"b4", "c4", "d4", "e4", "f4", "g4", "e5"}) == 1
Feb. 19, 2015