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 (x1,y1),(x2,y2) (x_1,y_1) , (x_2,y_2) , where x1,y1x_1,y_1 are the coordinates (according to how it is marked above) of the moved piece's initial position and x2,y2x_2,y_2 are the coordinates of the position of the piece after the move, evaluate (x1+y1)×(x2+y2) (x_1+y_1) \times (x_2+y_2)

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