Jacob Chiang (Cobysters) - National Master, Bullet Specialist
Jacob Chiang, known online as Cobysters, is a National Master with a reputation for blistering Bullet play and a sneaky endgame nose. Active since 2017, Jacob climbed from casual beginnings into a peak-level Bullet player while keeping a playful, unpredictable repertoire. Preferred time control: Bullet.
Quick Facts
- Title: National Master (National)
- Username: Cobysters
- Preferred time control: Bullet
- Peak Bullet rating: 2653 (2023-10-07)
- Career Bullet record highlights: 2169 wins, 2136 losses, 355 draws
- Longest winning streak: 20 games. Current winning streak: 13 games.
- Strong endgame presence - Endgame frequency about 76 percent
Biography
Jacob started playing rated online games in the late 2010s and quickly developed into a Bullet force to be reckoned with. What began as experimentation with offbeat ideas turned into a disciplined, high-volume approach. By 2020 Jacob broke into very high Bullet territory and carved out a reputation for tactical resilience and frequent comebacks. Opponents soon learned two truths: never underestimate his tricky opening choices and never assume the game is over until the last flag drops.
Playing Style & Strengths
Jacob blends aggressive opening choice with steady endgame technique. He thrives in chaotic time scrambles and has an excellent comeback rate.
- Comeback rate: 79.6 percent. Jacob often reverses bad positions into wins.
- Win rate after losing material: ~48 percent. Tactical resourcefulness is a hallmark.
- Avg moves per win: about 71 moves. Games often go deep into endgames.
- Time-of-day edge: unusually strong at early hours. Best time to challenge him may not be 06:00.
Openings & Repertoire (what to expect)
Jacob favors sharp and flexible systems. In Bullet he uses a mix of gambits and closed systems that are both practical and psychologically tricky.
- Amar Gambit - large sample size, practical: 267 games, win rate about 45 percent. Amar Gambit
- Australian Defense - reliable and frequent: 226 games, win rate about 48 percent
- Benoni Defense - aggressive counterplay: solid results in fast games
- Sicilian Defense, Closed - a frequent foundation of Jacob's play
- Nimzo-Larsen and other flank systems - used to avoid theory and create unbalanced positions
Top Opponents & Rivalries
Jacob has several recurring opponents he has faced many times online. These rivalries show both dominance and close contests.
- ryanwang01 - most played, Jacob leads 25-4 with 6 draws. ryanwang01
- bonafidegenius - 21 wins, 7 losses, 1 draw
- danny399 - long history with mixed outcomes: 12 wins, 10 losses, 5 draws
- never_walk_alone - tight series: 11 wins, 13 losses, 3 draws
Career Highlights & Notes
- High-volume competitor. Several seasons show hundreds of Bullet games per month.
- Exceptional peak months: sustained high ratings through late 2020 and 2023.
- Strong in Blitz and Rapid as well, but Bullet is the signature format.
Fun Facts
- Average first capture happens around move 6.5, meaning Jacob tends to avoid ultra-early trades or invites complications fast.
- Despite the Bullet focus, Jacob plays long decisive games frequently. Expect deep, messy endgames.
- Early resignation rate roughly 5 percent. He prefers to fight on, and often succeeds.
- Peak Blitz rating reached elite heights, showing all time controls are serious business.
Sample tactical taster (playable snippet):
Want to Explore More
Check Jacob's trend over time or inspect which openings give him the best returns. For a quick start, view his profile trends and top-opponent pages.
- Rating trend (Bullet):
- Win rates by opening:
- Sample recent opponent: ryanwang01