The Double Check

 White to move on the left board.  What move is guaranteed to win material?  My opponent responded incorrectly if I had a knight I could have mated him quickly, but since I didn't, mating him took a number of moves:



I didn't get the knight until later.  The game on my board continued:

 10. @f7+ Kxf7, 11. Bfxe6+ Ke7! 12. Qf7+ Kd8,  13. Qf8+ R@e8 (the knight mated here), 14. Qff3 Bxf2+, 15. Qxf2 Nf6,   16. N@f7+ Ke7, 17. @d6+ Kf8, 18. @e7+ Rxe7, 19A. dxe7+ Kxe7, 20. @d6+ Ke8 21. Nxh8 (always mindful of material) B@e3, 22A. @f7+ Kf8, 23. @e7# 1-0







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