Avatar of Sean Vibbert

Sean Vibbert FM

Username: Checksumme

Playing Since: 2019-09-23 (Inactive)

Wow Factor: ♟♟♟

Chess.com

Rapid: 2250
2W / 2L / 2D
Blitz: 2571
155W / 56L / 21D
Bullet: 2709
737W / 663L / 138D

FIDE Master Sean Vibbert: The Bullet Maestro

Sean Vibbert, aka Checksumme on the 64-square battlefield, is not your average chess player. Awarded the prestigious title of FIDE Master by FIDE, Sean is a bullet chess virtuoso whose speed and precision leave opponents blinking in disbelief.

Since bursting onto the scene in 2019 with a bullet rating near 1900, Sean swung through the ranks like a knight on steroids, reaching an astonishing peak rating of 2794 in bullet chess by 2024. As if lightning weren’t fast enough, Sean's bullet games average over 2600 rating points—a level mere mortals only dream about.

With over 900 wins and a winning rate slightly above 51% in bullet chess, Sean combines tactical sharpness with relentless energy. Perhaps most impressively, their comeback rate is a staggering 87.5%, and after losing a piece, Sean reportedly wins 99.3% of the time—proof that underdogs can bite hard.

When not blitzing pawns down the board, Sean also dabbles in blitz and rapid formats with respectable ratings in the 2500+ and 2300 ranges, showing versatility beyond just bullet speed. And for those who think rapid or daily games are tame, Sean’s 100% win rate in their rare daily matches reminds everyone they can take it slow and still dominate.

Sean has a playful, strategic style marked by a tendency to play long, intricate endgames (over 80 moves on average per win), proving patience is a virtue—even when you’re technically a bullet speedster.

Known for studying openings under the enigmatic label "Top Secret," and boasting some hilarious opponent records (like a 0% win rate against nicee_move9 but 100% against lailailaiking), Sean is a player who keeps fans guessing and opponents on their toes.

With a mental fortitude tested by an 11% tilt factor and a quirky habit of peaking wins around 1 a.m. and 7 p.m., Sean Vibbert embodies the spirit of a chess warrior: smart, fast, and just unpredictable enough to make the 64 squares their playground.

So next time you see the name Checksumme flashing on the leaderboard, remember: You’re witnessing a bullet master spinning the board like a whirlwind... and maybe losing a knight or two just for fun.


Coach's Avatar

Sean Vibbert - Constructive Chess Feedback

Sean, you've demonstrated solid foundational skills in your recent games, showing good opening knowledge and active piece play. Here are some tailored suggestions to help elevate your performance further:

Strengths

  • Opening Preparation: You are comfortable with flexible openings like the Sicilian and Reti systems, and you're not afraid to take on dynamic pawn structures, which indicates a good understanding of opening principles.
  • Piece Activity: You've utilized your knights and bishops effectively to create threats and control key squares, especially in the middlegame transitions.
  • Endgame Technique: Your ability to push passed pawns and coordinate your king and pieces in endgames shows promising endgame knowledge.

Areas for Improvement

  • Tactical Awareness: Review critical moments for tactical inaccuracies. For example, in some games, moves like early exchanges or missed captures could have been improved with precise calculation. Spend additional time practicing tactical puzzles to sharpen this skill.
  • King Safety and Timing of Castling: In a few games, the decision of when to castle or how to safeguard your king could be optimized. Prioritize king safety early to avoid sudden attacks, especially during open middlegame positions.
  • Handling Counterplay: You’ve encountered opponents who capitalize on pawn breaks and piece activity in your position. Work on recognizing and preempting your opponent's counterplay opportunities.

Practical Recommendations

  1. Regularly analyze your lost games with the focus on pinpointing where the turning points occurred — understanding these can prevent repetition of similar mistakes.
  2. Consider studying thematic middlegame ideas for your preferred openings – deepen your understanding of typical plans and pawn structures.
  3. Use training sessions to improve calculation under time pressure, as several games ended in rapid tactically decisive moments.

Final Thought

Chess improvement is a steady journey. You're laying down a great foundation — keep building on it by combining analysis, focused practice, and practical play. Celebrate your wins, learn from losses, and stay curious about the rich complexities of the game.



🆚 Opponent Insights

Most Played Opponents
Kimberly Liu 134W / 45L / 16D
canwedoit 31W / 72L / 6D
Tiago Pereira Rodrigues 25W / 29L / 4D
Rick Sun 19W / 24L / 5D
Devina Devagharan 34W / 8L / 5D

Rating

Year Bullet Blitz Rapid Daily
2025 2709 2571
2024 2733 2571
2023 2660 2509
2022 2585 2585
2021 2587 2560 2000
2020 2634 2442 2250
2019 2374
Rating by Year201920202021202220232024202527332374YearRatingBulletBlitz

Stats by Year

Year White Black Moves
2025 4W / 4L / 1D 3W / 3L / 3D 106.4
2024 101W / 111L / 22D 104W / 102L / 18D 100.2
2023 62W / 67L / 10D 55W / 71L / 11D 96.9
2022 37W / 21L / 5D 35W / 18L / 11D 79.3
2021 123W / 42L / 17D 125W / 41L / 16D 88.2
2020 197W / 138L / 29D 192W / 137L / 28D 82.3
2019 82W / 26L / 11D 60W / 38L / 15D 86.9

Openings: Most Played

Blitz Opening Games Wins Losses Draws Win Rate
Sicilian Defense: Closed 46 32 10 4 69.6%
Amar Gambit 22 13 7 2 59.1%
Colle System: Rhamphorhynchus Variation 20 12 5 3 60.0%
Unknown 20 10 9 1 50.0%
Scandinavian Defense 15 13 0 2 86.7%
Sicilian Defense: Alapin Variation, Sherzer Variation 13 9 3 1 69.2%
Sicilian Defense: Alapin Variation 12 7 2 3 58.3%
French Defense 10 5 4 1 50.0%
Amazon Attack 10 7 3 0 70.0%
Sicilian Defense 9 5 3 1 55.6%
Bullet Opening Games Wins Losses Draws Win Rate
Colle System: Rhamphorhynchus Variation 278 134 128 16 48.2%
Sicilian Defense: Closed 124 73 40 11 58.9%
Amar Gambit 112 57 50 5 50.9%
Nimzo-Larsen Attack 83 30 45 8 36.1%
Nimzo-Larsen Attack: Classical Variation 68 30 33 5 44.1%
Sicilian Defense: Alapin Variation, Sherzer Variation 53 31 19 3 58.5%
Caro-Kann Defense 44 22 16 6 50.0%
Scandinavian Defense 43 22 17 4 51.2%
French Defense 40 23 15 2 57.5%
King's Indian Attack 36 17 14 5 47.2%
Daily Opening Games Wins Losses Draws Win Rate
Sicilian Defense: Alapin Variation, Sherzer Variation 1 1 0 0 100.0%
Petrov's Defense 1 1 0 0 100.0%

🔥 Streaks

Streak Longest Current
Winning 19 1
Losing 11 0