The Pretender With A Real Title
Antoni Kozak, known online as MightyGMpretender, is a National Master who has spent years pretending to be anything but ordinary. The username sounds like a confession, but the play is a rebuttal. He has pushed his blitz rating to 3078 (2026-03-27) and his bullet rating to 3051 (2025-10-06), which makes the "pretender" label feel like a joke only he is in on.
His preferred time control is Blitz, and he plays it with the enthusiasm of someone who never learned the phrase "one more game." Along the way he built a deep friendship with the Caro-Kann Defense and a stormy romance with the Sicilian Defense. He also enjoys the Amar Gambit whenever the mood for chaos strikes.
Rivals, Rematches, And Repeat Customers
No rivalry defines Kozak quite like the one with rubi2211. They have faced each other 880 times, making rubi2211 the most played opponent in his career. Kozak has the edge in the series, but rubi2211 keeps returning, which is either persistence or a very slow burn.
He has also logged serious mileage against quaera, Davit_Tiraturyan, and Dmitry Tatarinov. Yet no one has come close to the rubi2211 volume, a testament to an online rivalry that refuses to end.
Chaos, Comebacks, And 3 A.M. Chess
Kozak plays like a man who has never met a pawn structure he could not complicate. His games tend to be long and messy, and he has an 88.47 percent comeback rate. He even wins 53 percent of the time after losing a piece, which is not sound advice but is very entertaining to watch.
His best time of day to play is 3 A.M., a fact that will surprise nobody who has watched a blitz addict chase a losing endgame. His longest winning streak was 53 games, and his longest losing streak was 10. That range covers both the summit and the tilt spiral.
For a self-proclaimed pretender, the results are remarkably real. Antoni Kozak may call himself the Mighty GM pretender, but the board keeps score, and the score says he belongs.