The match, carried over from Sunday, ended after Kamsky
struggled but failed to take advantage of a two-pawn lead over
3 1/2 hours. The 14th game will start Tuesday.
Karpov, 45, leads by 8-5 and needs just two more wins and a draw in the 20-game match to keep his World Chess Federation (FIDE) title.
Kamsky, 22, who defected from the Soviet Union to the United
States in 1988, is challenging Karpov in Elista, capital of
Russia's semi-autonomous Kalmyk Republic, near the Caspian Sea.
Players get one point for a win and half a point for a draw. If they are tied after 20 games, the match will continue until one of them wins another game.
Victory for either contestant will be devalued by the
absence of world No. 1 Garry Kasparov, who is not challenging
because of a split with FIDE.