I need help understanding a computer suggestion

machijv
Sep 3, 2013, 7:56 PM 664 Reads 2 Comments
It is black to play on move 17 and the computer says I made a mistake with 17. ... Bf5.  The computer suggests  17. ... PxP 18. NxP Bf5 19.Nf3 .  I am wondering why not 19. Nxp+ forking the rook.
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