1.e4e52.Nf3Nc63.Bc4Bc54.c3Nf65.d3O-O6.b4Be77.O-Od58.exd5Nxd59.b5Na510.Bxd5Qxd511.c4Qd812.Bd2b613.Nxe5Bf614.Bxa5bxa515.d4Bxe516.dxe5Be617.Qe2Qd418.Nd2Rad819.Nb3Qxc420.Qxc4Bxc421.Rfc1Bxb322.axb3Rd523.Rxa5Rxe524.g3g625.Rxc7a626.Rb7axb527.Raxb5Rxb528.Rxb5Rc829.Re5Rc230.g4Rb231.Re3h532.g5f633.gxf6Kf734.Rf3g535.h3g436.hxg4hxg437.Rd3Kxf638.Kg2Ke539.Kg3Kf540.Rd5+Ke641.Rb5Kf642.Rb4Ke543.Rb8Ke644.b4Kf745.Rb6Ke746.Rb5Kf647.Rb7Kg648.Rb8Kf749.b5Kg650.Rg8+Kf651.Rb8Kg652.b6...The
critical moment. Only one move draws for Black.52....Kg7??The idea of
"huddling" will not work when the king can slide in front of the pawn on the
seventh rank unless Black can achieve a Vancura setup.52...Rb4!Simply
put, Black must defend the pawn.53.b7and only now, once the pawn comes to
the seventh, does the king retreat withKg7or to h7, but of course not
falling into the familiar trap of being caught in "no man's land" with(53...Kf7??54.Rh8+−)53.Kxg4Rxf254.Kg5!!...The only winning move, and an
instructive one. Now, White threatens Rb8-b7+, forcing the king onto the back
row, after which the rook is liberated from its burden of defending the pawn
from the front, as will be illustrated in variations below. If Black tries to
chase down the pawn from the rear, White's king uses the opposition to
guarantee that it gets in front of the pawn in time to achieve a winning
Lucena.54....Rb254...Kh7is equivalent.55.Rb7+Kg856.Rc7Rb257.b7wins, with the threat of Rc7-c8+ and the checks running out shortly.54...Rf6is the sort of move Black would love to play, provoking an ill-timed
b6-b7 push, but of course now White wins with55.Rb7++−as Black cannot
block with the rook (the pawn is too far away), but king moves lose the rook.54...Rf1attempting to cut the king off also fails because after55.Rb7+!Kf856.Rc7we've reached the same position.55.Rb7+Kf856.Kf6Ke857.Ke6Re2+58.Kd6Rd2+This loses, as Black's king cannot stop the king from
getting in front of the pawn.59.Kc7Rc2+60.Kb8Rb261.Kc8Rb162.Rb8Ke763.Kb7Kd764.Rh8Rb265.Rh1Ra266.Rd1+Ke767.Kb8Rb268.b7Ra269.Rd4Ke670.Kc7Rc2+71.Kb6Rb2+72.Kc6Rb173.Re4+1-0 White wins.1-0