Mateusz Kołosowski, widely known online as mat_kolosowski, is a Polish chess International Master and a prominent streamer. With a career spanning well over a decade, he blends deep opening knowledge with relentless endgame technique. His Daily streams aim to educate while entertaining, inviting viewers into the quiet drama of long-form chess battles.
Career & Highlights
International Master title awarded by FIDE
Popular chess streamer, sharing analysis and game commentary with a growing community
Peak Blitz rating around 2833 (2025) and notable Daily peak around the mid-2400s in recent years
Endgame specialist with a penchant for long, strategic duels
Preferred time control: Daily, embracing thoughtful, depth-filled battles over quickfire blows
Playing Style & Openings
Kołosowski is celebrated for patient, resourceful play that often leans into rich endgames. His opening repertoire shows versatility, with a marked presence in the Gruenfeld Exchange and Slav structures, and a willingness to explore Sicilian lines and Grunfeld ideas as the position demands.
Gruenfeld: Exchange Variation
Slav Defense: Bonet Gambit
Sicilian Defense: Alapin Variation
Grunfeld: Exchange Variation
Profile & Links
Follow his journey and find more about his games and streams: Mateusz Kołosowski
For a quick visual snapshot of performance:
Coach Chesswick
Coach's Advice
It's been a while since you played. Play a few more games so we have more positions to review — then I can provide you with clearer, more actionable advice.
