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I don't know if I understand your question correctly...but: The size "board" you set as the parameter for findChessboardCorners does not correspond to the squares but to the inner corner points. So if you want to cover 3 x 3 squares you need to set the size to (4,4) - you will then find 4 inner corner points made up by 3 squares.

I don't know if I understand your question correctly...but: The size "board" you set as the parameter for findChessboardCorners does not correspond to the squares but to the inner corner points. So if you want to cover 3 x 3 squares you need to set the size to (4,4) - you will then find 4 inner corner points made up by 3 5 squares.