 Complete the following phrase:  By 2002, not only were there two rival champions, but Kasparovs strong results  he had the top Elo rating in the world and had won a string of major tournaments after losing his title in 2000  ensured even more confusion over who was World Champion. In May 2002, American grandmaster Yasser Seirawan led the organisation of the so-called Prague Agreement to reunite the world championship. Kramnik had organised a candidates tournament won later in 2002 by Peter Leko to choose his challenger. It was decided that Kasparov play the FIDE champion Ponomariov for the FIDE title, and the winner of this match play the winner of the KramnikLeko match for a unified title. However, the matches proved difficult to fice and organise. The 