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Generally, there are x2 standard squares, meaning 1 by 1 squares on which a piece would be placed. If we count all squares including 2 by 2, 3 by 3, etc. this question becomes more difficult.

The n by n square must fill the whole board - we cannot move it vertically or horizontally. The (n-1) by (n-1) board can be moved to two different locations on each direction, so there are 22 = 4 such squares. The (n-2) by (n-2) board can be moved to three different locations in each of two directions, giving us 32 = 9 such squares. This continues until we get to the 1 by 1 squares, of which there are x2.

Thus we find the number of total squares is equal to:

12 + 22 + 32 + ... + x2.

This can be more succinctly written as:

x(x+1)(2x+1)/6.

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13y ago

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