Péter Lékó (b. September 8, 1979 in Subotica, Serbia and Montenegro) is a Hungarian chess player. He became a grandmaster in 1994 at the age of 14 years (a world record at the time). In the April 2005 FIDE list, he has an ELO rating of 2763, making him number four in the world, and Hungary´s number one.
In 2001, Lékó narrowly defeated Grandmaster Michael Adams in an eight game Fischer Random Chess (Chess960) match played as part of the Mainz Chess Classic.
As a result, Lékó was hailed by many as the first Fischer Random Chess world champion.
This claim is not universally accepted, since there were no open qualifying matches.
Many do accept the claim, however, since this was also true of the first orthodox world chess champion titleholders, and both players were in the top five in the January 2001 world rankings for orthodox chess.
Lékó won the Dortmund Sparkassen Chess Meeting in 2002, the Linares tournament in 2003 (tied with Vladimir Kramnik) and the Corus tournament in 2005.
Under the terms of the so-called "Prague Agreement", masterminded by Yasser Seirawan, and intended to unite the two World Chess Championships, Lékó´s 2002 win at Dortmund qualified him to play a match against Vladimir Kramnik. It was intended that the winner of this match would play the winner of a match between Garry Kasparov and the FIDE World Chess Champion (first Ruslan Ponomariov, then Rustam Kasimdzhanov) to decide the undisputed world champion. After several delays, the match was held from September 25-October 18, 2004. It ended in a 7-7 tie, which entitled Kramnik to remain the reigning "classical" world champion.
Although Leko has a negative record against Kasparov, he beat Kasparov with black pieces in Frankfurt in 2000 (moves given in Algebraic chess notation):
1.d4 Nf6 2.Nf3 g6 3.c4 Bg7 4.Nc3 d5 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 a6 8.Qb3 c5 9.dxc5 Qa5 10.Qb6 Qxb6 11.cxb6 Nbd7 12.Be2 Nxb6 13.Be3 Nbd7 14.Nd4 Nc5 15.f3 e5 16.Nc6 bxc6 17.Bxc5 Rd8 18.Kf2 Be6 19.Rhd1 Nd7 20.Be3 Bf8 21.Rd2 f5 22.Rad1 Be7 23.g3 Kf7 24.b3 a5
25.Rc2 Nf6 26.Rxd8 Rxd8 27.exf5 gxf5 28.Na4 Bd5 29.Bb6 Ra8 30.Bc5 Nd7 31.Bxe7 Kxe7 32.Ke3 Kd6 33.Bd3 f4+ 34.gxf4 exf4+ 35.Kxf4 Rf8+ 36.Kg5 Ne5 37.Bxh7 Nxf3+ 38.Kh6 Rf4 39.Re2 Rh4+ 40.Kg7 Nxh2 41.Nc3 Nf3 42.Ne4+ Kc7 43.Nf6 Nd4 44.Nxd5+ cxd5 45.Rd2 Kd6 46.Bd3 Ne6+ 47.Kf6 Rf4+ 0-1