Help, I don’t know why my dude resigned!
After 38. ... Rg3+ 39. Kh5 Rfg4 the threat of Nf4 mate forces White to give up a Rook for the Knight, after which Black is a whole Rook ahead.
Why did Black resign when he had a forced win?
A couple of possibilities:
1) Maybe the baby woke up. People have real-life concerns that can force them to quit a game on short notice.
2) Maybe he was sandbagging... intentionally losing in order to keep his rating low, so that he can enter (and win) a rating-restricted tournament later on.
Am I the only person to consider that he had something else to do?
Read my post (possibility #1)
Just saw that (deleted the message), also I’m not sure that a 900 rated player would spot that forced mate, maybe he thought that white was going to promote?