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2 Rb6????? No, 2 Rf7+, followed by RxN
[EDIT] After this, White will win, Black has to play 1 Kg8, and and Whote has to continue checking, the Black King can never go to the f file
The black king has to move forever to h8 g8 and g7. If it dares move to the f file black loses the N and the game.
Ok...I knew I should be missing something. Thanx you guys.