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15 July 2026
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The square-counting puzzle: why 16 is wrong and 30 is right

The logical next step for anyone who has mastered the 4×4 case is to test the formula on larger grids: a 6×6 grid yields 91 squares, a 10×10 reaches 385. The open question for more advanced versions of the puzzle is how to handle non-square rectangular grids or grids with diagonal lines, where the formula no longer applies directly and a case-by-case geometric analysis becomes necessary.

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