Exchange Sacrifice in Kasparov-Barua

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In the game, White's Knight is a monster, easily the best piece on the board, and Black's Rook is paralyzed. It can barely move, and there's no good square it can go to. If Black doesn't trade Rook for Knight, the game will continue pretty much in the same vein, but it will be easier for White as his Knight is much better than Black's Rook.
It should be noted that Black appears to have good chances to draw or create a fortress. It’s definitely not easy for White to make progress, and White had to make many difficult decisions to convert the endgame. Said another way, Black probably draws against most people … just not prime Kasparov.