30....N-e4 was brilliant !!!! -- cutting off the Queen from guarding the g2 square. I rate that sac an "8", as you decimated him before he knew what hit him !
Though I wonder how you continue after 31 R-e2. do you play 31.....N-g5
32 exd, f3 and am not sure. Or maybe Black just plays ....Bxb4 threatening a big attack with B-c5+
what would you have played if 31 R-e2 ???
http://www.chess.com/livechess/game?id=1146902425
Can you rate the sac 1-10