zbigniew wieczorek: The Unstoppable FIDE Master of Online Chess
zbigniew wieczorek, better known as yuki_chess123, is a FIDE Master who treats online chess like a marathon rather than a sprint. Since his first Daily game in December 2016, he has built one of the most active profiles on the platform, with more than 40,000 rated battles across every time control. His title says Master, but his statistics say iron man.
From Daily Grind to FIDE Master
Zbigniew started quietly with Daily chess in late 2016, climbing from 1719 to over 2200 by 2020. The real fireworks began in 2019 when he started playing Blitz and Bullet in serious volume. Over the years his Blitz rating touched a remarkable 2612, while his Rapid chess peak reached 2455. That steady climb reflects a player who loves the process as much as the result.
A Repertoire Built for Endgames
Zbigniew's opening tastes lean toward flexible, positional setups. As Black he is happiest in the Modern Defense, the Caro-Kann Defense, and the King's Indian Defense, with a particular fondness for sharp Sämisch lines. As White he favours the King's Indian Attack, the Hungarian Opening, and quiet Réti setups, often outlasting opponents in long technical struggles.
His numbers tell the same story. He reaches the endgame in 76 percent of his games and averages nearly 68 moves per win. He rarely resigns early, with an early resignation rate below two percent, and he keeps fighting after losing material, winning half of those games anyway.
Marathon Man of the Server
The most striking part of Zbigniew's profile is volume. In February 2026 alone he played more than a thousand Blitz games. He has won over 13,700 Blitz games, more than 5,500 Bullet games, and over 1,500 Rapid games. His longest winning streak reached 22 games, and even his longest losing streak of 23 could not keep him down for long.
Friendly Foes and Fierce Rivals
No biography would be complete without the rivals who helped shape Zbigniew's online career. His most frequent opponent is mozg_ze_stali, with 69 meetings and a slight overall edge for Zbigniew. The strangest scoreline belongs to euseb, against whom Zbigniew has 48 wins, only one loss, and 18 draws in 67 games. That is a rivalry in name only, but clearly a profitable one.
The Night Owl Who Never Tilted
Zbigniew plays his best chess at 1 AM, where his win rate jumps to nearly 61 percent. Sunday is his strongest day, Tuesday his most dangerous. He is one of the least tilted players on the platform, losing only about 2.4 percent of games by a one-sided margin. When he is first to give check, he wins almost 58 percent of the time, a sign of relentless initiative.
Against stronger opposition he still scores a respectable 30 percent, and against lower rated players he converts at 63 percent. He also posted a personal best Rapid rating of 2455 (2025-11-11), proof that his preferred time control suits his patient style.