Julio Cesar Diaz Rosas (xberli): The Bullet King of the Board
Introduction
Julio Cesar Diaz Rosas, known online as xberli, is an International Master and streamer whose online play has made him a feared opponent in speed chess. While he is a strong all-rounder, his true kingdom is bullet chess, where he has reached a jaw-dropping peak rating of 2901 (2026-09-24). His preferred time control is bullet, and the numbers back it up with overwhelming force.
Online Chess Journey
xberli's online career is a story of relentless volume and steady ascent. From his early blitz days in 2015, when he hovered around 1900, to his bullet explosion in the late 2010s, he has played thousands of games across every time control. His bullet rating chart reads like a rocket launch:
. He crossed the 2600 mark in bullet in 2020, then kept climbing, eventually touching a stunning 2901 in 2026.His blitz game is just as impressive, peaking at 2677 (2022-06-15). He has won more than 2500 blitz games, and his overall record shows a player who thrives on volume and repetition. His longest winning streak of 26 games is a testament to his ability to enter a flow state and crush opponents one after another.
Playing Style and Opening Repertoire
xberli is an aggressive, opening-savvy player who is equally at home in the Sicilian Defense and the Caro-Kann Defense. As Black, his most played opening is the Najdorf Variation of the Sicilian, a sharp and theoretical choice that suits his fighting style. As White, he loves facing the Caro-Kann and has a strong record in the King's Indian Defense: Accelerated Averbakh Variation. His opening win rate chart shows a player who knows how to convert advantages:
.He is not afraid of unusual lines either. His bullet repertoire includes the Nimzo-Larsen Attack and a surprising number of games in the Amar Gambit, which suggests he enjoys keeping opponents off balance even at hyper-fast time controls. His average first capture comes around move seven, meaning he develops quickly and looks for early confrontation.
Rivalries and Notable Opponents
Every great online player has a list of familiar foes, and xberli is no exception. His most frequent rival is Alek, with 49 games played and a near-even score of 24 wins to 25 losses. Another recurring battleground is against Luis Torres, where the two are locked at 20 wins each. Against Omar Garcia Blanco, xberli has struggled, winning only 9 of 39 encounters, proving that even bullet kings have their nemeses.
On the flip side, he has dominated ajedrecistanocturno with a 30 to 1 record, a rivalry that must feel more like a friendly harvest than a contest. These rivalries give his online play a personal, almost episodic feel, as if every session is another chapter in a long-running saga.
Streaming and Personality
As a streamer, xberli brings the same energy to his broadcasts that he does to the board. He is known to play at all hours, but his best time of day is 5 AM, where his win rate peaks at nearly 59%. He has a remarkable comeback rate of almost 90%, meaning he rarely gives up even when the position looks lost. His Tilt Factor of 18 is surprisingly low for someone who plays thousands of bullet games, and he tends to win 66% of games against lower-rated opponents while holding his own against stronger ones.
With a one-sided loss rate of just 1.46%, xberli rarely gets blown off the board. He fights, he scrambles, and he finds resources. Whether he is streaming for an audience or grinding quietly, Julio Cesar Diaz Rosas remains one of the most entertaining and resilient figures in online speed chess.