This happened in one of my games. I blundered, but my opponent couldn't find out how to exploit it. Can you?

I didn't see that!

Neither did I 

Nice.  I love finding moves like these.

so you were white and your opponent was black?

Yeah

7-....Qg5 8-hg5 Rh1 9-Ke2 Bg4 10-f3 Bf3 11-Kf3 Rd1 nice shot

so your opponent made a good move without knowing it!

He didn't make that.

wouldn't 9...Nd4+ get queen without losing the rook.  i think.

true.

correct

thanks.  i am usually wrong about these thing, see.  so i wanted to check.

Nd4+ is met by Nxd4

The diagram you are talking about is wrong. Based on the original puzzle Nd4+ works.

Ahh yes, you are quite right! 

yes it is incorrct, sorry let me fix it!