Maciej Czopor: The Bullet Marathon Runner
The Player
International Master Maciej Czopor, known online as mac0504, is a chess endurance monster disguised as a bullet player. He started out in early 2018 with a modest bullet rating of 1400 and somehow turned that into a tiny spacecraft: by 2026 his bullet peak reached 2888 (2026-05-23), while his blitz rating kept pace near 2892. Along the way he racked up more than 5,000 bullet games, repeatedly proving that the clock is not a villain; it is just a medium.
Maciej does not merely play far, he survives far. His career win rate in bullet sits around 52 percent, his longest winning streak was a dizzying 13 consecutive wins, and his average decisive game runs over 75 moves. He is not hunting for quick tricks; he is quietly building an empire one rook check at a time.
The trajectory is clean:
.The Brave Opening Cabinet
Maciej greets the opening with the confidence of a man who has seen every internet gambit ever invented. He is comfortable in the Caro-Kann Defense, which appears more than 200 times in his blitz catalogue, and he steers into the Nimzo-Larsen Attack whenever he feels the board needs extra crystals. His bullet stats also show a remarkable love for the Amar Gambit and the Barnes Defense, and he wins more after his favorite non-standard moves than many players do after solid book lines.
Even the defensive names in his database sound like dice thrown by a mad chess professor. No matter how weird the first moves get, Maciej rarely ends up in a confirmated hole. The chart says it all:
.A Rivalry for the Ages
Few players have been measured against a single opponent as often as Maciej has faced Michal Fiedorek. Across 466 bullet and blitz games, Maciej has outscored michal_fiedorek with a staggering 296 wins to 129 losses, plus 41 draws. That is not a rivalry; that is a schedule. In second place by volume, matek18 appears in 379 games, and Maciej again has a clear lead that any chess player would frame on the wall.
His cause against those rivals is not simply the enemy. Maciej scores a 55 percent white win rate, a 52 percent black win rate, and over 87.2 percent of his comeback games end in success. When your knight is lost and the clock is below 30 seconds, that is apparently exactly where Maciej feels most alive.
By the Numbers
- Longest winning streak: 13 games, followed by a long cool patience.
- Longest losing streak: 9 games, yet he still rebuilt above 2800.
- Comeback rate: 87.2% and a 52.3% win rate after losing a piece.
- Best time of day to play: 05:00, the hour when only serious players exist.
- A comeback and a piece-down masterclass: he overly prefers queen and rook checks rather than silly mate.
So next time you see mac0504 across the virtual board, do not assume the bullet is a chaos. It is a format carefully designed by an IM who has already seen a good punch and at least one of your pawns. Probably both.