Originally posted by Natural Science
I don't see any way to even force a draw by perpetual check. First of all, perpetual check only applies to the king; perpetually attacking the queen is not perpetual check. Second, when White plays Rb1, Black can prepare to get his queen out of the way with Qa3.
He was talking about when he was checking the king, the king comes up, he rechecks the king goes back and so forth, the king comes up to save the pawn and they bounce back and forth like that. If he got the pawn it would have been an unavoidable perpet.
Like around move 23.
And instead of 24 R-a1, he could have gone R-e1, setting up possible rook checks which could have ended it in a few moves. R e1, e3, g3+...