Roberto Semillano: Bullet Chess Marathon Man
Roberto Semillano, better known to the online chess world as robertosemillano, is living proof that sleep is optional and flags are forever. His rap sheet reads like a typo: more than 31,000 rated bullet chess games and another 13,000 in blitz, including a legendary August 2022 stretch where he played 1,746 bullet games in a single month, roughly one every 25 minutes, awake or otherwise.
The journey was never a straight line. He debuted in bullet in late 2020, survived a humbling 2023 slump that dropped him into the 1400s, then launched a ferocious 2025 surge toward career-best form, with peaks of 2255 (2026-06-05) in bullet and 2433 (2025-11-18) in blitz. The full rollercoaster, complete with the scream-you-hear-at-the-bottom, is below.
Style: The Grind That Never Ends
Roberto does not do quick knockouts. His early resignation rate sits around 1 percent, his losses average nearly 74 moves, and barely 1.6 percent of his defeats are one-sided. Roughly four games in five reach a genuine endgame, where he happily out-walks opponents who assumed the clock would rescue them. The clock rescues nobody here: he has won nearly 10,000 games on time and lost about 12,400 the same way. In his world, flag-fall is a weather condition, not an accident.
- Comeback rate: just under 80 percent. A lost position is a suggestion, not a verdict.
- Average first capture: move 7. He develops first, grabs later, like a polite mugger.
- Wins average almost 69 moves. Slow strangulations only.
- Longest winning streak: 17 straight, before reality filed a formal complaint.
The Opening Arsenal
As White, more than nine of every ten games begin 1.d4, and anyone who answers with 1...e5 walks into his favorite ambush, the Australian Defense, which he has faced thousands of times at a healthy profit. He also keeps receipts with the Amazon Attack and poisoned-pawn raids in the London System, plus the magnificently named Colle, Rhamphorhynchus Variation, an opening named after a pterosaur, which is coincidentally the last thing many opponents see.
As Black, home is the Sicilian Defense, Kan Variation, Knight setup: over 1,450 bullet games at nearly 57 percent, with rapid results that flirt with 70 percent. He rounds it out with the trusty Benoni Gambit Accepted and occasional Amar Gambit science experiments.
The Kan in miniature above: flexible, sneaky, and allergic to losing quickly, much like its owner.
Nemesis and Sparring Partners
Every grinder has a wall, and Roberto's is philip_simon_din: 209 games, 89 wins, 115 losses, and 5 draws, a rivalry with more chapters than most streaming series. Elsewhere the ledger smiles on him: brixwayn38 has absorbed a 43-17 beating, tharsoe trails 40-26, and rmanichess has somehow drawn him 8 times in 48 meetings, the closest thing to a truce in the entire database.
Roberto Semillano by the Numbers
- 44,000+ rated games and counting, roughly 31,000 of them in bullet.
- 150,000+ checks delivered, with the queen as the tool of choice. If Roberto checks you, it is probably Her Majesty.
- Wins nearly 60 percent of games where he lands the first check. First blood usually collects.
- Best hour: 7 a.m., presumably with coffee. Best day: Wednesday, for reasons known only to the calendar.
- Tilt factor: 15 out of 100. Cooler than the far side of a bishop.
- Daily chess: 31 lifetime games, 21 wins. Played at a stroll, like dessert after 44,000 courses.
The Final Assessment
Roberto Semillano is what happens when stubbornness gets Wi-Fi. He does not resign, he does not rush, and he does not stop. Beat him if you can, but bring snacks: his games are long, his endgames are endless, and his rematch button has been known to keep the servers warm all by itself.