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Windows: W1



This is the first puzzle of this type which I created for practice of Indian Puzzle Team participating in World Puzzle Championship 2009. I have created some more puzzles of this type, which I will be posting here later.

This Puzzle type appeared in the following championships
"18th World Puzzle Championship, Antalya (Turkey)"

Instructions:
Blacken exactly two cells in each outlined 2x2 window to form one connected set of black cells which does not touch itself, not even diagonally. There cannot be a 2x2 square of four cells with the same colour (black or white) anywhere in the grid.

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