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10 votes

Flip counters in a grid so that they alternate in color

I am not sure if this is optimum but I can do it in six moves:
PDT's user avatar
  • 12.5k
8 votes
Accepted

Flip counters in a grid so that they alternate in color

A simple proof that PDT's solution is optimal:
Bubbler's user avatar
  • 14.2k
6 votes

Flip counters in a grid so that they alternate in color

Label the rows by A, B, C, D from top to bottom, and columns by 1, 2, 3, 4 from left to right. This is minimal because Also,
mathmandan's user avatar
  • 1,053
2 votes

Flip counters in a grid so that they alternate in color

I think I found a 6 move solution different to PDT
Christian Vaughn's user avatar

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