Despite the drawn match, Leko maintained a high level in 2005, winning the Corus tournament with 8½/13. and finishing fourth at Linares (6/12). After taking a break, Leko attended the first
Miskolc Rapid match against World No.7
Michael Adams in which Leko lost the first three games, won the next three and drew out the remaining two, ending the match 4-4. A 4/9 at Dortmund was followed by competing for the FIDE
World Chess Championship title in
San Luis, Argentina having qualified as most recent "Classical" challenger, finishing fifth with 6½/14. For more information, see
FIDE World Chess Championship 2005. In 2006, Leko scored solid results at Corus (tied 7th, 6½/14), Morelia-Linares (fifth, 7½/14), a 4½–3½ win in the Miskolc Rapid match against
Anatoly Karpov, Dortmund (tied third, 4/7) and in sharing first place with 5½/9 at the inaugural
Tal Memorial, he completed a career "Grand Slam" of major tournament victories at Dortmund, Linares, Corus and Tal Memorial. The next year, Leko struggled at Morelia-Linares tying for last place and lost the Miskolc Rapid match 4½–3½ against
Vladimir Kramnik soon after. Leko regained his form for the Candidates Matches held between 26 May and 13 June, held to select 4 players for the
World Chess Championship 2007. The format was held as a 16-player two-round knockout tournament with each match best of six games. He comfortably won his matches against
Mikhail Gurevich (+3−0=1) and
Evgeny Bareev (+2−0=3), to qualify for the eight-player championship tournament. A few months later, he won the ACP World Rapid Chess Cup. Shortly after the
World Chess Championship 2007 was held in
Mexico City from 12 to 30 September as an 8-player double round robin. Leko finished in fourth place with 7/14 and rounded off the year tying for third place (4½/9) at the Tal Memorial. In 2008, Leko tied for fifth in a strong field at Corus with 7/13 but tied for last place in Morelia-Linares with 5½/14 and lost a Miskolc Rapid match 3½–4½ against 17-year-old
Magnus Carlsen, but rebounded 4 months later with his third victory at Dortmund (after 1999 and 2002) with 4½/7, sixth place (4½/9) in a tough field at the Tal Memorial and securing individual gold on board 1 at the
38th Chess Olympiad held in Dresden. Leko took part in the
FIDE Grand Prix 2008–2010 which selected two players for the 2011 Candidates Tournament, electing to play in the four later tournaments in the 6-tournament cycle. In
Elista, Russia, he shared fifth place with 6½/13, in
Nalchik shared second with 7½/13, shared fourth at
Jermuk with 7½/13 and shared seventh place at
Astrakhan with 6½/13. With his weakest result at Astrakhan not counting towards his points tally, he finished in seventh place overall with 320 points, the highest final placing of a player who did not win an event. As he did not take part in the World Cup held in 2011, Leko did not progress to the Candidates Tournament. Aside from the FIDE Grand Prix cycle, 2009 saw Leko lose a Miskolc Rapid match 3–5 against
Viswanathan Anand, tie for second place with
Magnus Carlsen and
Dmitry Jakovenko with 5½/10 in a very strong Dortmund and finished in fourth place in
Nanjing, China. He struggled at the Tal Memorial of 2009 scoring 3/9, broke even at Corus 2010 with 6½/13, lost what would be the final Miskolc Rapid match 3½–4½ against
Boris Gelfand and came bottom of the Dortmund field with 4/10. After representing Hungary in the
39th Chess Olympiad in September he took several months away from chess. He made his return to chess at the
World Team Chess Championship held in
Ningbo, China in July 2011 with an undefeated 5½/9 on board 1. This was followed up by a shock first round exit from the
Chess World Cup 2011 against
Sam Shankland and a third-place finish at the Saratov Governor's Cup. The year was rounded off with 5½/9 at the European Team Championships held in
Halkidiki, Greece. In April 2012, Leko scored 4/6 for Moscow's SHSM-64 team at the Russian Team Championships then came second with 5/7 at Sigeman & Co Tournament, half a point behind
Fabiano Caruana. At Dortmund, Leko shared third place with Kramnik, Naiditsch and
Ruslan Ponomariov, scoring 5½/9 and narrowly missed a win against tournament winner Caruana, followed up by scoring 5½/10 at the
40th Chess Olympiad, held in
Istanbul. In September 2012 he entered the
FIDE Grand Prix 2012–13 as a nominee of AGON, who owned the rights to the World Championship cycle. At the first event, held in
London, he finished in fifth place with an undefeated 6/11 and at the
Tashkent event tied for seventh with a solid 5½/11 a month later. In April 2013 at the
Zug event, he shared seventh place with
Sergey Karjakin and
Anish Giri scoring 5/11. After skipping the event held in
Thessaloniki during the next month, he tied for third place with eventual series winner
Veselin Topalov at the fifth event held in
Beijing, scoring 6/11. Having completed his four tournaments in the cycle, Leko did not take part in the sixth and final event and finished the Grand Prix cycle in 13th place with 230 points (the result in Zug not counting towards his points tally). Outside of the Grand Prix cycle, Leko helped the SHSM team secure third place at the
European Chess Club Cup held in Eilat, Israel in October 2012, with a score of 3/6. Leko also took part in the World Mind Games finishing seventh with 3½/7 in the Rapid section and 6½/15 in the Blitz. He placed a strong fifth place at the Tata Steel Chess (formerly Corus) event in January 2013 with 7½/13. In April, he scored 3/6 for Ugra in the Russian Team Championships and in July, shared third with 4½/9 at Dortmund with Naiditsch. Leko tied for third with 5/9 at the Sherbank Rapid held in
Kyiv in June. In August 2013, Leko was knocked out of the FIDE World Cup 2013 in the second round ½–1½ by
Julio Granda, followed by scoring 4½/7 for sixth-placed Ugra at the European Club Cup held in
Rhodes in October. Leko finished the year at the World Mind Games with tied first in the Rapid section (losing out on head-to-head tiebreak) but tired with a 16th placed 11/30 in the Blitz section. In April 2014, Leko played in the Russian Team Championships for Malachite scoring 5/7, in July tied for second with 4/7 at Dortmund with
Georg Meier and contributed to a team silver medal at the
41st Chess Olympiad with 5/10. In August 2015, he played a 6-game match with Chinese Grandmaster
Li Chao in the city of Szeged in Hungary. He lost the match +0-2=4. Since November 2017, he has been coaching the German prodigy
Vincent Keymer.
Team chess results Leko first represented Hungary aged 15 years and two months at the
31st Chess Olympiad, going on to make nine more appearances at the Chess Olympiad, winning two team silvers and an individual gold, as follows: : Leko also took part in numerous Team Chess Championships, both at
World and
European level (notably debuting at Debrecen in 1992 at the age of 13 years 2 months), with results as follows: : == Playing style==