7
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Average Knight's Tour puzzle but this time on a 7x7 and starting from D5

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16
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Here is my answer:

It's not possible, because if you color the board and $A1$ be black, there will be $25$ black cells and $24$ white cells.

As we start from the white cell of $D5$, and each move of the knight will alter the color, then it's impossible to reach all black cells.

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