Who is maf1ozo?
Dimitri Petrenko, better known by the handle maf1ozo, has been a constant presence in online chess queues since 2017. His profile says Rapid is his preferred time control, but the power of the stats tells another story: more than 20,000 Blitz games and another 1,800 Bullet games. Add in the Rapid sessions and he has crossed 22,000 rated games, which is a more honest sign of a full time devotion.
The 2 AM Climb
Dimitri started as a 1500ish Blitz fighter who turned "a few more games" into a decade of queueing. His climb carried him from unknown handle to one of those names you hope is not on the other side of the board. He has reached a peak of 2785 (2026-06-25) in Blitz, and the chart below is basically a map of someone who never pressed "stop."
The statistics claim his best hour is 02:00. No one wants to guess what the next hour looks like for his opponents.
Repertoire, Comebacks, and Chaos
With White he leans on the Queen's Gambit Declined and regularly wades into the Nimzo-Indian Defense. As Black, he has a lifelong relationship with the Sicilian Defense in many of its forms, from Alapinian to Closed and everything that bites back.
His signature exhibit is the "Amazon Attack: Siberian Attack", a line that appears in almost 2,000 Blitz games. It is not the line his coaches would draw, but it is the line he has made his own.
- Comeback rate: 86.8%
- Win rate after losing a piece: 43%
- Longest winning streak: 16
- Longest losing streak: 14
The Rivalry That Keeps the Clock Running
If there is one player who appears in his history more than any other, it is Bartlomiej Niedbala. They have been paired 114 times, with maf1s holding 44 wins against 64 losses and 6 draws. That may look like a mountain to climb, but this is a man with a 16 winning streak and a comeback rate near 87 percent. That's just the next series.