Michal Mazurkiewicz: A FIDE Master Known as cthulhuuu
The Man Behind the Username
FIDE Master Michal Mazurkiewicz, better known online as cthulhuuu,is one of the most relentlessly active figures in online chess. His username may summon images of tentacled chaos, but his play is disciplined, patient,and deeply practical.
While his profile suggests a preference for Rapid time controls, his match history tells a very different story. He has played nearly 20,000 Blitz games and more than 4,500 Bullet games, with only a couple dozen Rapid appearances. In chess terms, that is called a hint.
Signature Weapons
Ask cthulhuuu what he plays,and the list reads like an opening encyclopedia with a charmingly unusual twist. The Czech Defense is his signature grind machine, appearing thousands of times. The Sicilian Defense family also shows up constantly, along with the King's Indian Attack when he wants to reach sharp middle games without walking into known theory.
- Czech Defense: over 4,500 Blitz games, including six Rapid games without a loss.
- Sicilian Defense: over 1,600 Blitz games with a strong 56.7% win rate.
- King's Indian Attack: a reliable system when he wants to keep opponents guessing.
A typical cthulhuuu Sicilian setup might start like this:
The Long Grind
Do not let the meme username fool you. The data shows a player who outlasts opponents in long battles. His average decisive game stretches past 70 moves,and he reaches the endgame in nearly 80% of games. He rarely delivers checkmate, instead winning by pressure, time trouble,and quiet resignation.
His longest winning streak reached 16 games,and his comeback rate sits at an absurd 85%, meaning defeat is seldom final. The overall Blitz journey has been a study in consistency and late-blooming improvement:
. His peak Blitz performance: 2682 (2026-09-20). For a fuller picture of how his results break down by opening, take a look at: .One Rivalry to Rule Them All
Every online warrior needs a nemesis,and for cthulhuuu,that role belongs to Aleksandra Tarnowska. They have faced each other 215 times in Blitz alone,and cthulhuuu holds a lopsided 169 victories. It is a beautiful friendship, if your definition of friendship involves 39 defeats for tarno17.
A Final Piece
Michal Mazurkiewicz has built an online legacy that proves you do not need the sharpest opening to become a FIDE Master. You just need a solid Czech Defense, a willingness to spend 70 moves, anda rival who keeps coming back for more. In the chaotic realm of cthulhuuu, slow and steady wins the rating points.