my games with supriya guru

In this game played on 17/8/14. Got this winning position.

i am black here. what should i play?

ANS : DRAG OVER IN BRACKET

(Qd5 + is a easy win for black. I miss it )

after few moves, following position is reached..

what did white miss here?

ANS: ( he missed g5 !! a quiet but winning move)