That forces the row player to replace K by something. In that box, the only possibility is 7, but it is precluded by the column constraint on K's column. Thus, the column player forces a win.
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A computer science professor encourages his students to break Sudoku's rules
That forces the row player to replace K by something. In that box, the only possibility is 7, but it is precluded by the column constraint on K's column. Thus, the column player forces a win.
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