In 2006, along with younger sister Tatiana (as of 2009 an International Grandmaster), she shared second place at
the Russian women's superfinal, one-half point behind the winner. Being of
similar strength, the two sisters normally play on consecutive boards of the
national women's team at the Chess Olympiad and other team
In December 2008, she won the Russian Women's
Championship in Moscow. She finished
second in this event in 2009.
Lahno was the fifth seed for the 64-player knockout 2004 Women's World Chess Championship.
At the age of 15 she won the 2005 European Individual Women's Championship,
held in June in Chişinău, Moldova. Tied with Russian IM Nadezhda Kosintseva at the end of the 12th
round with 9 points each, Lahno won both games of a two-game rapid-play
tie-break playoff to win the championship. She won IV Women's 'North Urals Cup
- 2006', attaining a full grandmaster norm in the process. In May 2008, Lahno
won the European Individual Women Chess Championships again in Plovdiv, by
one-half point in the 11-round open tournament.
On February 25, 2009 she marriedRobert Fontaine, French chess
grandmaster and TV reporter. The same year, she became Russian Team
champion with the club of Spartak, and then won the European Team championship
in Ohrid. In August 2010, Kateryna became World Woman Blitz Champion. At the 40th Chess Olympiad in Istanbul in
2012, she won the individual bronze medal for her performance on Board One.
In the most recent (October 2012) FIDE rating list, Hou
is ranked as the No. 1 girl player in the world, the No. 2 female player, and the No. 13 junior player. She is
only the third female chess player to achieve a FIDErating
of over 2600.
Hou produced a stunning performance in January 2012 playing in a very
strong open tournament in Gibraltar. In a field of 55 other grandmasters, 11 of
them rated at or above 2700, Hou shared the lead with Nigel Short on 8/10,
subsequently losing to Short in rapidplay. She had faced 7 of the 2700+ players
and achieved an overall tournament performance rating of 2872.