Queens on a Chessboard

A queen on an English chessboard is able to attack in the same row, column and diagonal. The probability that 2 randomly placed queens on an 8 by 8 chessboard will be able to attack each other can be expressed as ab \frac {a}{b} , where aa and bb are positive, coprime integers. What is the value of a+ba + b?

Details and assumptions

The 2 queens will not be placed on the same square.

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