Even now White cannot force his QRP through, so he must exchange the last pair of rooks. To do this, he must first drive Black's knight away from . . . KB1, in order to penetrate to Q7 with his rook.
48 NxR K-K3
This makes White's task much easier. 50 . . . N-B5 was stronger; White would first have to dislodge this powerfully placed knight by 51 K-Bl followed by B-K3, K-B2 and K-B3.
The final phase really belongs to a book on endgame theory, but is an excellent illustration of our theme. By threatening to advance his QRP, White diverts his opponent's pieces away from the centre and the K-side, even though this entails the loss of his outside passed pawn.
White's bishop takes over as a blockader, while the knight attacks the KP and KNP.
White now threatens 57 N-B4 and 58 N-R5, then, after the forced . . . K-Q2, 59 B-B8 P-R4 60 P-N4 would allow the decisive entry of his king to attack the weak pawns. This plan is only possible because Black's pieces are tied to holding up the QRP.
Allowing further simplification.
57 BxN! KxB
After 58 . . . K-K3 White's QRP would win the game for him. His king would cross to the Q-side, then play to QN7 after P-R7. So Black prefers to remove this thorn in his side, but at the expense of his K-side pawns.
59 NxP K-N3
60 NxNP KxP Black's QBP has now become the outside passed pawn, but this means little compared to White's material and
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