## Hundred Colors of Math

I recently bought a book by Evdokimov, titled *Hundred Colors of Math*. The book has lovely math puzzles and cute pictures. The book has answers but doesn’t explain them. Also, the English translation is decent but not perfect. For these two reasons, I am not sure I would recommend the book. However, I do like the puzzles, and here is one of them, called **Runaway Cell**.

Puzzle.The figure depicted in the picture (a 6-by-6 square, in which the top row is moved by one square) was cut along the grid lines into several identical parts which could be put together to form a 6-by-6 square. The parts are allowed to be turned over. What is the minimal possible number of such parts?

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## Lazar Ilic:

2 onsight symmetry smooth continuous physical transformation .gif in my head now I am studying topology again:

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15 May 2024, 2:33 amXXXOOO

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## Konstantin:

I know two different solutions (one is angle-connected)

15 May 2024, 3:10 am## Lazar Ilic:

Oops. Yet again, I misread!

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For example by reflecting the Xs across the vertical line of the 4th column. I have yet to see a relatively strong solver in code.

15 May 2024, 12:32 pm