Hanty Mansiysk (Russia): World's top Woman player Judit Polgar of Hungary showed steely nerves as she outwitted Lenier Dominguez of Cuba to move into the last eight stage of the World Chess Cup.

Judit's result in the Cup has been inspirational right from the first round and Dominguez was on Thursday added to the list of casualties following the ouster of Sergei Movsesian of Armenia and top seed Sergey Karjakin of Ukraine in earlier rounds.

The rapid tiebreaker was fought on an even keel with Judit taking the lead in the first game with a clean show and then Dominguez won the next.

This set the stage for the semi-rapid games where again both shared a victory each reaching the blitz tiebreak in which Judit drew the first game with white and then won with black to cruise home.

It may be recalled that Judit had lost the first game with in the normal games and Dominguez was very close to attaining a draw in the second which would have meant curtains for Judit who eventually won 4.5-3.5.

The other tiebreaker, which too stretched to the blitz, was between Ruslan Ponomariov of Ukraine and Bruzon Lazaro of Cuba in which the former prevailed after coming from behind in the semi-rapid games. Ponomariov also won by 4.5-3.5 margin.

In a fairly, one-sided contest in the tiebreaker, Ukrainian second seed Vassily Ivanchuk won both the rapid games to send Xiangzhi Bu of China out of the World Cup. Earlier the two had drawn both normal games.

Alexander Grischuk of Russia secured his place in the last eight at the expense of compatriot Vladimir Potkin. After both had shared a victory under normal games, Grischuk drew the first rapid game and won the next to win by 2.5-1.5 score.

In the other tiebreaker of the day, V Anand's second Peter Heine Nielsen went down fighting against Vugar Gashimov of Azerbaijan. Peter Heine lost both games in the semi-rapid games of ten minutes each after sharing a win each under normal and rapid games.

Complete results round 4:
Lenier Dominguez (Cub) lost to Judit Polgar (Hun) 3.5-4.5; Vassily Ivanchuk (Ukr) beat Xiangzhi Bu (Chn) 3-1; Dmitry Jakovenko (Rus) lost to Teimour Radjabov (Aze) 0.5-1.5; Ruslan Ponomariov (Ukr) beat Bruzon Lazaro (Cub) 4.5-3.5; David Navara (Cze) beat Yaroslav Zherebukh (Ukr) 2-0; Gata Kamsky (Usa) lost to Peter Svidler (Rus) 0-2; Peter Heine Nielsen (Den) lost to Vugar Gashimov (Aze) 4-2.