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Got it! solution in Clear category for Pawn Brotherhood by maxim.poplavskiy
def safe_pawns(pawns):
safe=set()
di='.12345678.'
abc='.abcdefgh.'
for x in pawns:
safe.add(abc[abc.index(x[0])-1]+di[di.index(x[1])+1])
safe.add(abc[abc.index(x[0])+1]+di[di.index(x[1])+1])
safe=safe&pawns
return len(safe)
Feb. 10, 2015
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