Interesting Puzzle 1/07

This is an interesting combination that i missed in one of a game i played in 2005. Try search for the solution yourself. To make more interesting, don't use the computer...but... if you no more have the ambition to be world champion like me...why not huh!

Hairulov - Haslindah Ruslan [E42]

7th CAS Second Quarter Allegro (Cat1) 22.05.2005

E42: Nimzo-Indian: Rubinstein 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Nge2 cxd4 6.exd4 Nc6 7.a3 Be7 8.d5 exd5 9.cxd5 Ne5? 10.Bf4 0–0 10.d6 Bf8 11.Nb5 Qa5+ 12.Nec3 Rb8 13.Qe2 Nfg4 14.f3 f6 15.fxg4 a6



Guess what i should play on my 16th move.