at Vienna, 2009
|Full name||Sergei Tiviakov|
|Born||14 February 1973|
Krasnodar, Russian SFSR, Soviet Union (now Russia)
|FIDE rating||2608 (January 2020)|
|Peak Elo rating||2699 (October 2005)|
Tiviakov won the Politiken Cup in Helsingør, Denmark in July 2008 on tiebreak after scoring 8/10. In 2009 he won the 13th Unive Tournament in Hoogeveen. In 2011 he came first in the Fagernes Chess Festival, in the 5th Leiden Chess Tournament and in the First Panama Chess Open. In 2015 Tiviakov won the 24th Paul Keres Memorial Rapid Tournament in Tallinn.
His first Olympiad appearance was for Russia at the Moscow event in 1994, when he took home a gold medal in celebration of the team's winning performance. He played for the Dutch team at each of the events held from 2000–2006, with an overall record of +14 −2 =33 (62.2%).
At the European Team Chess Championships, he has earned three gold medals (two team and one individual) for his contribution to the successful Dutch teams of 2001 (León) and 2005 (Gothenburg). At León, he registered a 77.8% score.
Tiviakov and Bogdan Lalic both claim to have played a previous record 110 consecutive tournament games at classical time controls without losing, although neither player faced exclusively elite-level opponents during their unbeaten streaks. Tiviakov's streak occurred between 28 October 2004 and 27 September 2005. The current record belongs to Magnus Carlsen (+39, =78), who remains unbeaten through 117 games since 31 July 2018. While Tiviakov claimed to hold the record, he has also pointed out that a comparison of his streak with performances such as Ding Liren's 100 consecutive games without a loss against elite-level opponents in 2017–2018 is a comparison of apples and oranges.
- "Plovdiv: Tiviakov, Lahno win European Individual Championships". ChessBase. 2008-05-03. Retrieved 4 January 2016.
- Crowther, Mark (2009-10-25). "TWIC: 13th Unive Tournament 2009". London Chess Centre. Archived from the original on 14 March 2012. Retrieved 1 June 2010.
- "First Fagernes Chess Festival – Chess in the fjords". ChessBase. 2011-04-28. Retrieved 28 April 2011.
- "Tiviakov wins 5th Leiden Chess Tournament". ChessBase. 2011-07-18. Retrieved 18 July 2011.
- "Tiviakov wins First Panama Chess Open". ChessBase. 2011-11-09. Retrieved 10 November 2011.
- "GM Sergey Tiviakov wins 24th Rapid Tournament "Paul Keres Memorial" 2015". Chessdom. 2013-01-13. Retrieved 8 January 2016.
- Bartelski, Wojciech. "Men's Chess Olympiads: Sergei Tiviakov". OlimpBase. Retrieved 21 October 2010.
- Friedel, Frederic (23 May 2017). "New in Chess Invincibility List". ChessBase. Retrieved 23 October 2019.
- Peterson, Macaulay (11 November 2018). "Ding defeated! Tiviakov celebrates!". ChessBase. Retrieved 23 October 2019.
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