Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.



Chessboard squares

It was once claimed that there are 204 squares on a chessboard. Can you justify this claim?

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If you enjoyed this puzzle, check out Sunday Afternoon Maths IX,
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Sunday Afternoon Maths LXVII

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Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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