Our prediction of 59. ... Rb7 comes to pass!

Right now, the situation is still somewhat complicated, because each side has two pawns. White should be able to win a pawn to go up 2:1, when each side will aim for well-known theoretical endings (even if they have to trade down to do so).

Let's talk for a moment about the goals of each side in the possible rook and single pawn ending: White (the stronger side) is aiming for the "Lucena position," where the opponent's king is cut off from the pawn (and the superior side has his king in front of pawn, assisting its advance). Black (the weaker side here) is aiming for the "Philidor position," in which he guards the 3rd rank with his rook and blocks the pawn with his king. Black bides time, until the White pawn is advanced to the 6th rank (with the White king on the 5th rank). He then shifts his rook to the 1st rank to allow a series of checks (on the files, not the ranks) to keep White from making progress (for example, an exchange of rooks will lead to a drawn K + P vs. K ending).

Black has good chances to hold, because he can probably reach the "Philidor position."