I missed it too at first...
don't beat yourself up :P
I missed it too at first...
don't beat yourself up :P
What he said. A few quick notes:
Your Bishop was hanging from move 5 to 10, it was just lucky your opponent decided to leave it alone
.
On move 9, why didn't you just move the Knight back?
You missed (20. Qg4+) winning the Knight.
46. g8=N?? A queen would've been a far better idea.
doesn't matter what black does on move 46, 47. qf7 is mate
Edit - ok, be7 could save the day, but not for long - point still stands
If you simply promote to a queen on move 46 then you threaten 47. Qf7 checkmate.
So, 46. g8=Q Kd7 47. Qe6+ Kc7 48. Qc8+ Kb6 49. Qc6+ Ka7 50. Ra8# is a pretty easy checkmate to deliver with queen and rook working together.
His third move c5, is not good. It leaves a very weak hole at d5 which I'm glad to see you immediately took advantage of.
5.Bc4 was excellent. That way if he takes, you can replace the knight with another piece.
6.b3 was a poor move. Now he can do b5, forcing your bishop away from the knight and losing your outpost. Besides, fianchettoing wouldn't have done much at the time, because his e pawn was blocking the diagonal. Castling or c3 followed by d4 woulda been more logical.
10.exd5 is a poor move. Bxd5 woulda been much better, setting up a nice post.
The only other thing I can say is, don't underpromote unless you really need to or it immediately leads to a checkmate. And when in doubt, put him in check. That way at least you know you haven't stalemated.

7. Ng5 a mistake indeed: he could bxc4. Your knight and his bishop are still defended by pawns.
9. He will take your knight or bishop. You can choose to preserve one you like or eat a pawn with your B. You can also Qg4 to win position, or distract him from your N & B.
10. Bxd5 much better. Good outpost for bishop + pin on knight + support for Q on white squares (if you want to attack).
14. Qf+ is free Knight
16./19. What's with the pawns? Your fgh pawns are more interesting. + maybe you should get your B there or your rooks in some way.
20. Qg4+ again free knight
up to here you're doing good developing your pieces
32. f8 = Q trading your precious pawn for a knight wasn't your best option. You had all means necessary to keep the queen or get at least a rook for it.
37. h4 Why would you trade your rook for a bishop
38. h5 Didn't you see the rook? by the way while moving it anyways Rf7 and later Bg5 or Bf8 would mean a free bishop.
46. g8 = N ?? It is't advantageous, a Q would've been more helpful despite the fork on his bishop
48. Kf5.. It wasn't very obvious, but if the only piece he can move is his king, you should always keep an eye on his moving possibilities.
I don't think your biggest mistake was the stalemate. You should take more advantages of his exposed king.
This recent game of mine is a perfect example of how sloppily rushing to finish off an opponent who seems to be a goner can backfire in an embarassing way. I nearly bruised my forehead on the keyboard when I realized what I had just done. This is the first game for which I've ever attempted to provide analysis, so please bear with me and offer what help you can. Thank you!