Originally posted by cmsMaster
After some not so stellar middlegame play I ended up in this endgame. Playing through I found the entire thing very challenging and educational, lots of good endgame techniques can probably be seen from this one game. I'm hoping that you guys feel like looking through and analyzing the last 15 to 20 moves of this game, I'm sure ther ...[text shortened]... I'd offer my own analysis now, but I'm so burnt out from playing it that I need a break.
Just looking at the portion of the game occurring after White was up the exchange plus a pawn (48.Rxh8), I'd say the key for Black is the need to *blockade passed pawns*. 48...Bf3 with ...Bg4 to follow would force White to exchange his rook for the bishop, if White chose to try to queen a pawn.
On the other hand, mate with rook and king is entirely possible. White can station his rook on the 6th rank, trapping Black's king, and then bring his own king up to weave a mating net.
Going back a little further, I think that 43...Bg4 would again have been better for Black. The Black rook is well placed on the second rank trapping the White king, and is able to get behind the passed pawn (via ...Rh2) because *rooks belong behind passed pawns*. Note that the Black bishop can also guard the Black rook if the rook moves to h3, from which square it can menace both the passed pawn and the g3 pawn. At that point, the White king is going nowhere, the White pawns are going nowhere, and the White rook cannot defend the passed pawn.