Battle of the Americans! An upset win for White over USA's Olympiad top board.
White gets into trouble early after opting to long castle against the Petroff,
facing a furious queenside pawn storm. Black missed one resource to keep the
pressure on, and afterwards her attack was slowed to the point where, even
when she won material, it was too late. In the ensuing queen endgame, Black
faced serious problems and was unable to solve White's king activity.1.e4e52.Nf3Nf63.Nxe5d64.Nf3Nxe45.Nc3Nxc36.dxc3Be77.Bf4Nd78.Qd2Nf69.Bd3O-O10.O-O-Od511.h3c512.Kb1c413.Be2b514.Ne5Qb615.Bf3Be616.g4b417.cxb4Bxb417...a5!18.c3Bc519.Be3Rab820.Bxc5Qxc521.Qd4Qb522.Rd2Rfd823.g5Ne824.Bg4Nd625.g6!hxg626.Bxe6fxe627.Nxg6!Nf528.Qe5...Finally, Black is starting to face accountability for the
static pawns in the center.28....Qb629.Rg1Kf730.Qf4d431.Nh4dxc332.Nxf5!...White calculates the winning sequence correctly.32....exf533.Qxc4+Kf834.Qxc3Rxd235.Qxd2Qf636.Rd1Kg837.b3Re838.Qd5+Kh739.Qd4Qg640.Qh4+Kg841.Rd8Rxd842.Qxd8+Kh743.Qh4+Kg844.Qd4a645.h4Kh746.Kb2Qe647.a4Qe2+48.Ka3Qe7+49.b4Qe150.a5Qc1+51.Kb3Qb1+??51...Qf1Black's only chance was keeping White's king cut off from the c4-square and
subsequent activation.52.Kc4Qf1+53.Kd5Qe254.Kd6Qe855.Kc7Qe256.Kb6Qb5+57.Ka7Qe258.Qc5Qd359.Kb7f460.Qh5+Kg861.Qe8+Kh762.h5Qc463.Qg6+Kg864.Qe8+Kh765.Qg6+Kg866.h6Qxb4+67.Kxa6Qc4+68.Kb7Qd5+69.Kb6Qd4+70.Kb5Qd5+71.Kb4Qd4+72.Kb3Qd5+73.Kc2Qc5+74.Kd3Qb5+75.Kc2Qc5+76.Kd1Qd5+77.Ke2Qe5+78.Kf3Qc3+79.Kg2f3+80.Kg3Qe5+81.Kxf3Qc3+82.Ke41-0 White wins.1-0