From Unknown to FIDE Master
Behind the username kjzsdu stands a FIDE Master whose online career is a masterclass in persistence. The journey began in 2013 with blitz ratings below 1,200. A decade later, kjzsdu had reached a blitz peak of 2773 (2024-06-27) in June 2024 and a bullet peak of 2814 (2022-05-09) in May 2022. While the profile lists Rapid as the preferred time control, and Rapid produced a sparkling 16 win, 1 loss, 2 draw record, the true home is blitz, where more than 14,000 games were fought. The full arc is visible in the chart:
.Relentless Fighting Spirit
kjzsdu plays like someone who refuses to lose quietly. The endgame is a favorite hunting ground, with more than 81 percent of games reaching that stage. The comeback rate sits at an absurd 89.2 percent, and even after losing a piece, kjzsdu still wins nearly half the time. A 28 game winning streak shows the ceiling, while a 40 game losing streak, largely buried in a miserable daily chess stretch in 2019, shows the floor. Few players could turn such a rough patch into motivation, but kjzsdu bounced back to set new personal bests.
White brings a slight edge: 52.34 percent wins, versus 49.36 percent as black. Early resignations are rare at just 1.57 percent, confirming a player who prefers to fight until the last pawn falls. kjzsdu also saves the best for rated battles, performing eight percent better when the rating is actually on the line.
Bold Opening Repertoire
kjzsdu's opening tastes are broad. The Sicilian Defense anchors the repertoire, with the Najdorf Variation alone appearing in 805 blitz battles. The Caro-Kann Defense is a close companion at 650 games. Beyond the mainstream, kjzsdu happily explores the Döry Defense, the Colle Rhamphorhynchus Variation, and the Czech Defense, where the win rate jumps to 56.5 percent. The opening performance landscape can be explored here:
.A Night Owl at Heart
The stats also reveal a player who thrives in the small hours. kjzsdu's best winning percentage comes at 4:00 AM and 11:00 PM, both at 54.89 percent. Tuesday is the most productive weekday, while Sunday is the toughest outing. Whether this is deliberate scheduling or sheer chess obsession remains a mystery, but the numbers are clear.
Familiar Rivals
Every great online career is built on recurring battles. kjzsdu's most played opponent is Lucas Aguiar Cunha, who faced this FM 50 times in blitz. kjzsdu holds a narrow edge: 24 wins, 22 losses, and 4 draws. Behind aguiar94 stand dozens of other regulars, each contributing to a record of nearly 7,300 blitz victories. These long running rivalries show that kjzsdu values consistency, familiarity, and above all, the joy of the fight.