• Pawn-brotherhood problem

I would like to give some feedback about ...

From: http://www.checkio.org/mission/pawn-brotherhood/solve/


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Test case [ "a1", "b2", "c3", "d4", "e5", "f6", "g7", "h8" ] implies that it is OK to have a pawn on row 1, so the correct answer is 7. On the other hand test case [ "a1", "a2", "a3", "a4", "h1", "h2", "h3", "h4" ] is supposed to have correct answer 0, while one would expect it to be 6, because all pawns are safe except "a1" and "h7". It is not clear why 0 is the correct answer.