so i'm a beginner at igo, and a beginner friend of mine and i have been playing igo in our calculus class with that programme on the ti-89 that i said in a previous question didn't function all that great (you have to manually 'remove' each stone, there is no scoring so you have to use area scoring, etc.) anyways, he didn't want to jump immediately to a 19 x 19 goban so i first played him a 9 x 9 game (or a 13 x 13, i forget...) anyways, he prompted my resignation when he put one of my living groups in atari while i was listening to the lecture, and then handed it back to me. on my move i didn't catch what he'd done and he said 'yes' when i moved and captured the group! cheap, but anyways... next we started a 13 x 13 game and i'd like any of you to analyse this position...

Current Board Position:  

I'm in particular thinking that this move at the marked stone was a bad one, and that i instead should have done a 3-3 point invasion at the circle point. But anyways i think most of my moves haven't been too good... basically i'm wondering who's winning--i think i am but i'm not sure...