Profile
Sergey Kharitonov, known online as dzuffin, is a FIDE Candidate Master with an appetite for online battle. He has played tens of thousands of rated games across bullet, blitz, and rapid, turning the digital chessboard into a personal laboratory. His preferred time control is rapid, and his rapid peak of 2430 (2026-04-04) reflects years of steady grinding. His blitz peak of 2526 (2026-02-25) and bullet peak of 2387 (2026-09-07) prove he is dangerous at every speed.
Repertoire and style
If one opening defines Sergey, it is the Sicilian Defense. He has played it thousands of times with both colors, and the Najdorf Variation is his most frequent battlefield in blitz and rapid. As White he often reaches for the Alapin Variation against the Sicilian, and he is equally happy facing the Caro-Kann Defense or the Scandinavian Defense. His stats also reveal a taste for the Amazon Attack and the Bird Opening, so surprises are guaranteed.
Sergey is a stubborn defender. His comeback rate is 83.33 percent, and he still wins 44.37 percent of games after losing a piece. He almost never resigns early, with an early resignation rate below one percent, and he wins more games by resignation than by checkmate. His games run long, with wins averaging around 65 moves.
Rivalries
Every fighter needs rivals, and Sergey has built several. He has faced anay agarwal 71 times, producing an almost perfectly balanced score of 34 wins, 34 losses, and 3 draws. Against Peter Large he trails slightly, while Akhilesh Pande and Jocko1959 have become regular dance partners. The toughest matchup is lynexeo, who holds a commanding lead in their head-to-head series.
By the numbers
- His longest winning streak is 10 games, and his longest losing streak is 13, which shows he always bounces back.
- He is a night owl. His best winning percentage by hour of day comes at 2:00 AM.
- Against lower-rated opponents he wins 68.46 percent of the time, and against higher-rated players he still takes 29.44 percent.
- He has lost more games on time than he would probably like, but he has also delivered 396 checkmates.
- His favorite day to play is Wednesday, with a win rate of 47.27 percent.