It was a long day, so this will be a short report. There were four draws, all of which, interestingly enough, concluded in opposite-colored bishop endings. Along the way the games were of varying interest, with the battle between Maxime Vachier-Lagrave and Hikaru Nakamura the most colorful of the lot.
The game of the day was between Wesley So and Levon Aronian. This may have been the case even if Aronian had won by prosaic means, by default, but in fact the game was something special. So played provocatively on the white side of a 4.f3 Nimzo-Indian that came to resemble a Modern Benoni, and when he dared to play 13.g4 he reaped the whirlwind after Aronian's 15...Ne5!! Black had fantastic compensation for the piece, and while there was nothing concrete his initiative was practically impossible to quell. With the win, Aronian moved to +2, and is tied for first with Veselin Topalov, half a point ahead of Magnus Carlsen and Anish Giri.
The games, with my notes, are here, and these are the pairings for round 5:
- Aronian (3) - Grischuk (1.5)
- Carlsen (2.5) - So (1.5)
- Nakamura (2) - Giri (2.5)
- Anand (1) - Vachier-Lagrave (2)
- Topalov (3) - Caruana (1)