This is a solution for a 7 x 7 game submitted by Angelmorph. You only need to flip all the pieces marked with a star in the following picture:
The solution is quite easy to remember. First you should flip the 1st, 2nd, 4th, 6th and 7th pieces on the first row, then scan the pieces row by row, and if a piece is black, simply flip the piece directly below it.
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