(EWOH27) writes:

A chessboard has
1 square 8 units by 8 units
4 squares 7 units by 7 units
9 squares 6 units by 6 units
etc. up to
64 squares one unit by one unit.

This adds up to 204 squares.

But the person who wants to make a board only needs to know about the 64
squares of area one square unit.

Then ofcourse the board is one square too.

/M.