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First solution in Clear category for Pawn Brotherhood by frantisek.jahoda
def safe_pawns(pawns):
rows = '_abcdefgh_'
secure = 0
for c, r in pawns:
p = rows.index(c)
nr = str(int(r)-1)
if (rows[p-1]+nr) in pawns or (rows[p+1]+nr) in pawns:
secure += 1
return secure
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
April 4, 2016