White checkmates in three moves

 

I saw the above chess set up. Both players have positioned themselves well. Both have the same number of pieces on the board, 13. The blacks have lost a bishop for a pawn but have positioned themselves strategically. But it's the whites term and it checkmates the blacks in three moves. This is how it goes

Move  1: The white Queen at H3 takes the black Pon at H7. Check !

Move 2: The black Queen at G8 takes the white King at H7. 

Move 3: The white Knight at E4 goes to F6, Check! Black Queen H6 or H8

Move 4: White Rook E3 to H3, check mate !