In your answer, rows 2 and 5 are identical (OXOOXOXX) and rows 3 and 4 are identical (XOXXOXOO). This violates the rules that all rows and columns must be unique. So that's why your answer is not correct.
korren -> RE: why? (5/27/2013 7:46:05 AM)
column 4 and 6 from left are the same against the rools