Mate!

Logic Level 4

Consider the positional set up of a game. It is white's turn to move. White can checkmate black in just two moves, can you find the first move to force a checkmate?

If the first move can be written as \( (x_1,y_1) , (x_2,y_2) \), where \(x_1,y_1\) are the coordinates (according to how it is marked above) of the moved piece's initial position and \(x_2,y_2\) are the coordinates of the position of the piece after the move, evaluate \( (x_1+y_1) \times (x_2+y_2) \)

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