Vladimir Fedoseev is one of the most creative and combative players at the top of modern chess — a world top-25 grandmaster who beats the best by dragging them into chaos. Here’s a collection of verified, sourced facts about him: the records, the titles, and the trivia worth knowing. Where anything is time-sensitive, we’ve dated it (everything current is as of July 2026).
The headline facts
- He reached the semifinals of the 2021 FIDE World Cup — a top-four finish at one of the toughest knockout events in chess, losing the semifinal to Sergey Karjakin and the third-place match to Magnus Carlsen.
- He won silver at the 2023 World Rapid Championship, scoring 9½/13 and finishing behind only Magnus Carlsen.
- He beat world #1 Magnus Carlsen in a classical game at the 2024 Chess Olympiad, playing for Slovenia.
Records & milestones
- Peak classical rating of 2739 (2025) — a world top-25 level.
- 2021 FIDE World Cup semifinalist (finished fourth).
- 2023 World Rapid Championship silver medalist (9½/13, behind Carlsen).
- 2017 Aeroflot Open champion — winner of what was long the strongest open tournament in the world.
- 2024 European Rapid Champion and European Chess960 Champion.
- 2025 Grand Chess Tour: Superbet Poland Rapid & Blitz winner.
- Under-18 European Youth Champion (2013).
The “Bigfish”
Almost everyone in online chess knows Fedoseev by his handle “Bigfish.” It started as his username and stuck — fans and commentators now use it as his nickname. It suits a player who so often plays the role of the shark in the tank, hunting for wins against the biggest names in the game.
From Russia to Slovenia
- Fedoseev was born in Saint Petersburg, Russia, on 16 February 1995.
- Following the 2022 invasion of Ukraine, he stopped representing Russia, saying he had “no will to represent Russia in any competition anymore.”
- He competed under the neutral FIDE flag before completing his transfer to the Slovenian federation in July 2023, immediately becoming Slovenia’s highest-rated player.
- He first represented Slovenia at team level at the 2024 Chess Olympiad — where he beat Magnus Carlsen.
The swindle king
One of Fedoseev’s most beloved trademarks is his knack for saving lost positions. His “swindle rate” is famously high because he never stops posing practical problems — even in a bad position, he’ll set trap after trap and make his opponent find the one clean path to victory. It’s a skill built on refusing to give up psychologically and a sharp eye for tactical tricks, and it makes his games unmissable: with Fedoseev, it’s never truly over until the scoresheet is signed.
A Saint Petersburg pedigree
Fedoseev grew up in Saint Petersburg, a city with one of the richest chess traditions on earth. It’s the same chess culture that produced world champion Mikhail Botvinnik — the “patriarch” of the Soviet school — and eight-time Russian champion Peter Svidler, among many others. Coming through that environment, with its deep coaching traditions and fierce local competition, is part of how a talented junior grows into a world top-25 grandmaster. Fedoseev’s fighting, creative style is very much his own, but the technical grounding behind it traces back to one of chess’s great cradles.
Fedoseev by the numbers
- 2739 — his peak classical FIDE rating (2025).
- 9½/13 — his score for silver at the 2023 World Rapid Championship.
- 4th — his finish at the 2021 FIDE World Cup (semifinalist).
- 16 — his age when he earned the grandmaster title in 2011.
- 1995 — the year he was born, in Saint Petersburg.
Why Fedoseev matters
It would be easy to file Fedoseev under “dangerous attacker” and move on, but that undersells him. He’s a player who won the toughest open in the world, fought his way to a World Cup semifinal, medaled at a World Championship event, and has beaten just about every elite name — Carlsen included. He did all of it not by playing safe, but by playing the most entertaining, uncompromising chess at the top of the game. In an era where many elite games are cautious and drawish, Fedoseev is a throwback to pure fighting chess — and that’s exactly why fans love him.
Quick-hit trivia
- His nickname “Bigfish” comes from his online username.
- He hails from Saint Petersburg, one of the great cradles of Russian and Soviet chess.
- He’s known for playing offbeat openings — the Dutch Defense, or 1.b3 as White — to steer opponents into fresh positions. See his openings.
- His biggest single scalp is arguably beating world #1 Magnus Carlsen at the 2024 Olympiad.
- He is a genuine fast-chess specialist, with World Rapid silver and European Rapid gold to show for it.
FAQ
What country does Vladimir Fedoseev play for? Slovenia. He completed his federation transfer from Russia in July 2023 and is Slovenia’s highest-rated player, having declined to represent Russia after the 2022 invasion of Ukraine.
What is Fedoseev best known for? His creative, aggressive, uncompromising style; his run to the 2021 World Cup semifinals; his 2023 World Rapid silver medal; and his knack for beating elite players — including Magnus Carlsen.
Why is he nicknamed “Bigfish”? It’s his long-time online username, which fans and commentators adopted as his nickname.
Has Fedoseev ever beaten Magnus Carlsen? Yes — most notably in a classical game at the 2024 Chess Olympiad, where Carlsen was world #1.
Keep exploring
Back to the Vladimir Fedoseev profile · see his best games · check his rating history · explore his openings · or browse all chess players.
Written and fact-checked by the Chess Lab Academy Editorial Team · Facts verified against Wikipedia, his FIDE profile, and Chess.com, as of July 2026 · Last verified 2026-07-10 · How we verify content.