Ponomariov was born in Horlivka in Ukraine. He was taught to play chess by his father at the age of 5. At 9 he became a first category player, and in September 1993 he moved to Kramatorsk. Here Ponomariov attended the A. V. Momot Chess School and was trained by Boris Ponomariov.[1] In 1994 he placed third in the World Under-12 Championship at the age of ten. In 1996 he won the European Under-18 Championship at the age of just twelve, and the following year won the World Under-18 Championship. In 1998, at the age of fourteen, he was awarded the Grandmaster title, making him the youngest ever player at that time to hold the title. In 1999, he was a member of the Ukrainian national youth team, which won the U-16 Chess Olympiad in Artek, Ukraine.[2]
Among Ponomariov's notable later results are first place at the Donetsk Zonal tournament in 1998,[3] 5/7 score in the European Club Cup 2000 (including a victory over then-FIDE World Champion Alexander Khalifman), joint first with 7½/9 at Torshavn 2000, 8½/11 for Ukraine in the 2001 Chess Olympiad in Istanbul, winning gold medal on board 2, and first place with 7/10 in the 2001 Governor's Cup in Kramatorsk.
In the same year he finished second in the very strong Linares tournament, behind Garry Kasparov. His result in the strong 2003 Corus tournament at Wijk aan Zee was not as good – despite having the third highest Elo rating, he finished only joint eleventh out of fourteen players with 6/13, and at Linares the same year he finished only fifth out of seven with 5½/12.
There were plans for him to play a fourteen-game match against Kasparov in Yalta in September 2003,[citation needed] the winner of which would go on to play the winner of a match between Vladimir Kramnik and Péter Lékó as part of the so-called "Prague Agreement" to reunify the World Chess Championship (from 1993 until 2006 there were two world chess championships). However, this was called off by FIDE on the grounds that Ponomariov failed to sign the contract in time. The latter always alleged lack of equality in the contract for both contenders.[citation needed]
On Ponomariov's 20th birthday, October 11, 2003, he became the first high-profile player to forfeit a game because of his mobile phone ringing during play. This happened in round one of the European Team Chess Championship in Plovdiv, Bulgaria, when Ponomariov was playing Black against Swedish GM Evgenij Agrest.
In 2005, he won the 15th edition of the Ciudad de Pamplona tournament. He also won a rapid tournament in Odesa, Ukraine, and the Golden Blitz Cup in Moscow. Finally, that year he reached the 2005 Chess World Cup final against Levon Aronian, who won the final. Ponomariov defeated Fritz under tournament conditions, at the 2nd Festival Internacional de Ajedrez Man-Machine in Bilbao, Spain. This is the last time that a human player has defeated a top computer at even odds under tournament conditions.[5]
In 2006, he shared first place with Aronian and Peter Leko in the Tal Memorial tournament in Moscow.
In 2009, he shared first place with Hikaru Nakamura at the Donostia Chess Festival in San Sebastian, Spain. The latter won the tie-break blitz games 2–0. Ponomariov got one more second place by tie-break that year in the 2009 Chess World Cup, where he reached the final against Israeli Boris Gelfand. After four classic games, four rapid games, and two blitz games with a drawn score, Gelfand finally won in one last set of two blitz games.
In February 2011, after occupying last place at the World Blitz Championship in November 2010 in Moscow, Ponomariov showed great improvement at the strong Aeroflot Blitz held in the same city by reaching second place, just half a point behind Shakhriyar Mamedyarov.