The One Who Brings the Storm
Rodrigo Vasquez is a FIDE Grandmaster who competes online as K_A_S_T_O_R. The handle has a mythic ring to it, and his results often look legendary. He has played more than 18,000 rated games on the platform, and his profile says his preferred time control is Daily. In practice, however, he spends most of his energy in Blitz and Bullet, where his rating climbs into the stratosphere.
From a modest start in 2016, K_A_S_T_O_R climbed the Blitz ladder with remarkable speed. He crossed the 3,000 Blitz barrier and kept his Bullet game close to that same mountaintop. He is a rare mix of volume and quality, a player who treats online chess like a full-time sport.
Blitz Behemoth
The chart below tells the story of a player who simply refused to stay in one rating bracket.
Vasquez's Blitz peak reached 3038 (2025-12-25), with Bullet close behind at 2984 (2025-12-01). His Daily profile is comparatively humble, with a peak of 2131 (2021-07-16), fitting for someone who prefers fast games but still appreciates the idea of a slow one.
Opening Laboratory
When Rodrigo sits down with the white pieces, he is predictable in the best way: he almost always plays 1.e4. That leads to a sharp opening repertoire built around the Sicilian Defense: Najdorf Variation and the Caro-Kann Defense. In Blitz he has played the Najdorf 896 times and won 62.28% of those games. In Bullet his Najdorf win rate jumps to 71.47%, which should terrify anyone who tries to outcalculate him in the open Sicilian.
As Black he is equally flexible, often reaching the Philidor Defense or sidestepping into the Caro-Kann. His win rate by opening is a fine map of his taste for imbalance and counterplay.
A typical K_A_S_T_O_R Najdorf battlefield looks like this:
Fierce Rivalries
One name appears endlessly in Rodrigo's history: Leónidas Gutiérrez. The two have faced each other 1,243 times, and Vasquez won 1,145 of those games. He lost only 71 and drew 27. It is less a rivalry and more a long-running chess seminar, with K_A_S_T_O_R as the professor.
Comeback DNA
The numbers suggest Rodrigo does not go down quietly. His comeback rate is 85.86%, and he wins 56.54% of games even after losing a piece. His one-sided loss rate is just 1.17%, meaning almost every loss he suffers is a fight. His longest winning streak is 34 games, while his longest losing streak is 11, which shows how quickly he resets and strikes back.
By the Numbers
- Blitz wins: 6,210
- Bullet wins: 4,396
- Longest winning streak: 34 games
- Comeback rate: 85.86%
- Favorite time to play: 14:00
- Best day of the week: Wednesday
Daily Grind
Even a Blitz monster needs a slower lane. Rodrigo's profile lists Daily as his preferred time control, and his record in Daily is perfect in the sense that he never lost: two wins and one draw in three games. Maybe his Daily games are the chess equivalent of a vacation home, a place to relax while the Blitz thunderstorm continues outside.