Topalov

Bulgarian player Veselin Topalov won the International Chess Federation's 2005 World Championship in San Luis, Argentina. The eight-player event had every competitor face each opponent twice. Topalov began with 6.5 points from seven games and secured the title with one round remaining.

That achievement requires an explanation of the split world title . From 1993 to 2006, two rival championship lines existed: one organized by the International Chess Federation and another descended from the title match Garry Kasparov had played outside that organization. Topalov held the first title. In 2006 he faced Vladimir Kramnik in the reunification match for the World Championship and lost in the tiebreak.

Topalov approached the crown again after defeating Gata Kamsky in the 2009 Candidates match. That result earned him a 2010 challenge against Viswanathan Anand, who won 6.5 to 5.5 by deciding the final game. Topalov's career therefore connects the split-title period with the reunified championship cycle.

The strength of his best season

San Luis completed an exceptionally strong year. At Linares 2005 Topalov matched Kasparov's score, although the tournament tiebreak placed him second, and defeated the former champion in the final round. He also won the M-Tel Masters in Sofia. He therefore entered the championship as a contender who had repeatedly demonstrated his strength against elite opposition, rather than producing an isolated surprise.

He finished San Luis unbeaten on 10 points from 14, one and a half ahead of Anand and Peter Svidler. After six wins in the first half, he drew all seven games in the second. That contrast is instructive: a player associated with attack also had to hold difficult positions and manage his tournament lead. The final result combined the creation of opportunities with the ability to prevent rivals from catching up.

Preparing positions that are difficult to solve

A feature of his chess is the pursuit of lasting imbalances: different pawn structures, pieces performing unequal roles, or initiative in return for material. Opening preparation, in which he worked with Ivan Cheparinov, allowed him to enter complex positions with concrete ideas. Preparation does not mean memorizing only a sequence of replies. It also involves knowing which pieces should remain, where a file can be opened, and which exchanges would remove the compensation.

His victory against Levon Aronian at Wijk aan Zee 2006 is a representative example. Topalov gave up the exchange for activity and later sacrificed material again. The cooperation of his bishops and the advance of his pawns mattered more than a conventional count of piece values. The game allows a student to follow compensation that is initially difficult to measure as it becomes concrete threats and eventually a decisive advantage.

Learning from his games

To study this style, stop before the sacrifice and identify its conditions. If the queens disappear, are the pawns still strong? If the defender returns material, can the pieces become free? Does the initiative require immediate action, or is there time for an improving maneuver? These questions distinguish a positionally grounded sacrifice from a gamble based only on the opponent making a mistake. His matches against Kramnik and Anand also allow this approach to be compared with extraordinarily precise defense. The lesson is not to sacrifice out of habit, but to assess how much useful work the remaining pieces can actually perform.

Annotated games

• Kasparov versus Topalov, 1999