Neither Norway's world champion Magnus Carlsen or Russian challenger Sergey Karjakin have forced a victory yet with the overall score in the 12-game series now tied at 3½-3½.

Today's contest was ended as a stalemate after 34 moves and two hours of play.

A mistake by Karjakin, playing with white, allowed Carlsen to put himself in a strong position but the Norwegian then made a miscalculation of his own while using black.

This led to a series of forced and then perfunctory moves before the players shook hands.

"The last two games have not been so interesting," said Carlsen, after match six was also a short draw.

"Anything can still happen."

Game eight is due to take place tomorrow with the possibility of a drawn series appearing to very much be on the cards.

This would result in a four-game rapid chess match, in which the tournament time controls would be reduced.

If this does not break the deadlock, five two-game matches of blitz chess would be contested with players facing even less time to make their moves.

The final tiebreaker would be an "armageddon" game where the two players will face different rules.

White has more time on the clock, but a draw for black would be the same as a victory.

As such a winner under armageddon rules is guaranteed.