Plamen Mladenov: The Bulgarian Bullet Grinder
Introduction
Plamen Mladenov, known on the board as levski-sofia, is a FIDE International Master whose username pays homage to the iconic Sofia football club. Over the past decade, he has turned online chess into a personal laboratory, playing tens of thousands of serious rated games. His title may come from over the board chess, but on this platform he lives in the fast lanes, and his preferred time control is clearly bullet.
Career Trajectory
Mladenov began his recorded blitz journey in September 2016 with a rating floor around 1374 and quickly stormed past 2100 within the same month. From there, the climb was steady and relentless. By October 2025 he reached his career best blitz rating of 2788 (2025-10-23), a number that puts him in rare air for an online grinder.
His rating history shows a player who never stops fighting, even when the curve gets bumpy. The long arc from 1374 to his peak is a testament to volume, study, and a genuinely thick skin.
Opening Repertoire
Mladenov is not a one trick pony. As White, he has played the Amazon Attack Siberian lines over 4,000 times, and he also happily enters the Amar Gambit when he wants to steer the game away from prepared lines. When he wants something more solid, the London System and its Poisoned Pawn variations appear in his blitz menu hundreds of times.
As Black, the Sicilian Defense is his true home. He has navigated the Sicilian's Classical, Closed, and Richter Rauzer systems in well over a thousand games, and his results there are remarkably consistent for such a high volume.
Playing Style and Psychology
Mladenov is the definition of a grindser. His analyzed blitz record shows 11,353 wins, 11,346 losses, and 2,539 draws, a near perfect 50 percent split that reflects an endless appetite for competitive chess. He has put together a 17 game winning streak, but he has also survived a 12 game losing streak, proof that he does not shy away from tough opposition.
His games are marvelously stubborn. He reaches the endgame in nearly 80 percent of his games, and his average winning game lasts about 83 moves. He also has an 85 percent comeback rate, meaning he keeps creating chances even when things look bleak. If you want a quick point against him, bring your patience, because he will not hand it over easily.
One quirk: his stats suggest he plays best at 4 a.m. So if you meet him in the early hours, you are facing peak Mladenov.
Rivals and Rivalries
Every great online player has a cast of familiar foes, and Plamen is no exception. His most frequent opponent is Rogelio Jr Antonio, who has faced him 76 times, followed closely by WarlordX with 74 meetings and Florescu Codrut Constantin with 69. These rivalries are the lifeblood of his online career and have produced countless tense battles.
He also enjoys a strong head to head record against Mihai Ionescu, with 25 wins against only 11 losses. Against the very toughest grinders, though, the ledger stays honest, and that is exactly why his matches remain so compelling.
Final Thoughts
Plamen Mladenov is a player who treats every bullet and blitz game as an opportunity to learn, attack, and compete. With an International Master title, an enormous opening repertoire, and the stamina of a marathon runner, levski-sofia is the kind of opponent you remember long after the last flag falls.