It looks like being an ex-champion has worked out for Vladimir Kramnik. Over the past year or so, with the exception of the first half of the match with Anand, Kramnik has probably played the best chess in the world. (Carlsen's performance in China was by a long way the best single performance, but overall it seems to me Kramnik has had the best last year or so.) Maybe it's a full return to health from his earlier problems, or marriage and fatherhood, or a renewed sense of ambition, but whatever the explanation his chess and fighting spirit have really perked up.
He needed it today, as Ponomariov made him sweat it out in a harrowing game. With White against the Ragozin System, Kramnik responded well to a novelty and gained a winning advantage in the early middlegame. The position was incredibly sharp, however, and after a long think Kramnik chose a second-best continuation. The position remained a complete mess, and Ponomariov again went wrong - but so did Kramnik. This pattern continued for a long time, even into an ending where Kramnik's extra exchange was well matched by Ponomariov's bishop pair and connected queenside passers. Neither man handled the situation perfectly, and at one moment Ponomariov missed a shot that would have given him an advantage. Generally speaking, though, the pattern of Kramnik being better and getting, then squandering, serious winning chances continued for a long time. Still, he plugged and plugged away, and by move 60 he finally achieved a clear technical win. Even that wasn't a cakewalk, but on move 81 Ponomariov at last gave up, and Kramnik regained solo first.
Had Anand defeated Carlsen, then they would have remained tied, but he only managed to draw. (Perhaps he was resting on his laurels?) It wasn't for lack of effort, though, the previous parenthetical joke notwithstanding. In a Ragozin - or was it an abortive Vienna Variation? - Anand, with Black, enjoyed a queenside initiative and was about to collect all his opponent's pawns, but Carlsen managed to whip up enough counterplay to hold the draw.
If Aronian had won, he'd have caught Anand in second, but he lost to Gelfand. In a battle of two Semi-Slav specialists, Aronian innovated first in a position where Black had gone 0 for 3; after his novelty, it was 0 for 4. Aronian slips back to 50%, and now it's Gelfand who is in third.
Tied for third, that is, because Ivanchuk also won with Black. His victim was Morozevich, whom he outplayed in a Modern Benoni (by transposition). "Moro" allowed Black's queenside expansion with ...b5, but didn't achieve compensation anywhere else. In fact, Ivanchuk gradually achieved complete domination, and needed only to make the time control without blundering. He made it, and his opponent resigned several moves later.
The last game was Leko-Svidler. Leko gained an edge, but couldn't do anything with it and a draw was agreed just after the time control.
Standings After Round 6:
1. Kramnik 4½
2. Anand 4
3-4. Gelfand, Ivanchuk 3½
5-6. Carlsen, Aronian 3
7. Ponomariov 2½
8-10. Morozevich, Leko, Svidler 2
Round 7 Pairings:
Aronian - Kramnik
Ivanchuk - Gelfand
Anand - Morozevich
Svidler - Carlsen
Ponomariov - Leko
The games, with my comments, are here.