How the World Championship Was Reunified in 2006
After the "Toiletgate" scandal (see our full account of that dispute) nearly ended the match outright, Vladimir Kramnik and Veselin Topalov finished their 12-game classical match level at 6-6 and went to a four-game rapid tiebreak to decide who would become the first undisputed World Champion since the 1993 schism. Kramnik won it 2.5-1.5, sealed by a Topalov blunder so severe that a chess.com headline later described it as losing "the rook, the game and the match" in one move.
Thirteen years of a fractured title
Since Garry Kasparov broke away from FIDE in 1993 to form a rival championship lineage, chess had lived with two rival "World Champion" titles, one classical, one FIDE, at the same time. Kramnik, who had beaten Kasparov himself for the classical title in 2000, and Topalov, the reigning FIDE World Champion, playing this match was the sport's first real chance since the split to put the crown back together.
The tiebreak, game by game
Game 13 was a draw. Game 14 went to Kramnik. Game 15 went to Topalov, levelling the tiebreak and setting up a winner-takes-all Game 16. That final game arose from a Semi-Slav Defence, a well-worn battleground for both players, and stayed roughly balanced for most of the game before Topalov, needing only a draw to force sudden death, cracked under the tension.
The blunder that ended it
On move 44, with a difficult but very likely holdable position, Topalov played 44...Rxc5??, a move that looks like it wins a pawn and instead loses the rook outright to a tactic he had missed. There was no swindle, no time pressure excuse strong enough to explain it away, just a single miscalculation at the exact moment the entire unification of the World Championship hung on the result.
Why one blunder carried this much weight
Championship tiebreaks compress years of buildup into a handful of must-win moments, and Game 16 is the clearest illustration of how thin that margin actually is. Kramnik became the 14th undisputed World Champion not because he outplayed Topalov across the tiebreak, the score was close throughout, but because he was the one still calculating clearly in the position that mattered most.
Try it yourself
Before you play your next rapid or blitz game, calculate anything that "wins material" for two full moves before playing it, not one. 44...Rxc5 almost certainly looked good on the first half-second of consideration. Championship-level players still blunder when they stop calculating one move too early; club players do it constantly.