Antonio Marcelo MANN: The Dinosaur Who Plays the Bird
Meet Marcelossauro
Antonio Marcelo MANN, known across the online chess world as marcelossauro, is living proof that evolution has a sense of humor. His username hints at a dinosaur. His favorite first move is the Bird Opening. And since birds are, taxonomically speaking, dinosaurs, this man is simply playing in accordance with his own ancestry.
Since his first rated blitz game in June 2018, when he debuted at a humble 1400, Marcelo has played nearly 58,000 games and collected more than 28,000 wins, grinding his way up to a blitz peak of 2702 (2025-10-10) and a bullet best of 2689 (2026-01-18). The surname arrives in capital letters, which feels appropriate for someone who opens with 1.f4 and means it.
Bird Is the Word
More than 11,800 of his games begin with the Bird Opening, at a win rate hovering around 55%. In 2018 he tried 1.e4 exactly seven times, apparently decided it was not for him, and has been threatening the f-pawn ever since. Opponents who spent years memorizing main lines are greeted instead by the Dutch Variation, a backwater so quiet you can hear the pterodactyls.
The recipe is simple: push the rook's pawn, develop calmly, and let the panic set in.
Rapid Fire, Slow Grind
His preferred time control is Rapid, and the results explain why: a 104-47-4 record there, a strength-adjusted win rate near 64%, and a peak of 2394 (2026-05-31). In rapid play he also deploys the Blackburne Shilling Gambit, a trap so rude it should require a permit, winning with it 12 times in 13 attempts. With the black pieces, the Caro-Kann Defense serves as his stubborn backbone across every time control.
The style stats read like a survival manual. Roughly 80% of his games wander into an endgame, and his average win lasts 83 moves. He does not defeat opponents so much as outlive them. His resignation rate is a microscopic 1.47%, meaning if you want the point, you must march over and take it. Even after dropping a whole piece he wins nearly half his games, and his 84.76% comeback rate makes any celebration premature.
The 5 AM Lizard
His best performing hour is 5 AM, which raises the question of what a cold-blooded creature is doing awake before the sun. His worst hour is 11 AM. Do not arrange a rematch at brunch.
Other exhibits from the natural history museum: a tilt factor of 16, essentially Zen. Roughly 130,000 checks delivered across 57,993 analyzed games, with the queen as his weapon of choice about 50,000 times. When he checks first, he wins around 60% of the time. Daily chess is the one habitat where he flops at 2-4, apparently because correspondence patience does not suit a lizard.
Foes, Frenemies, and a Haunting Number
Every great player has rivals, and Marcelo has faced Hyoukami a staggering 125 times, narrowly leading that war of attrition 65-58-2. Long-running duels with purpleberry22, roacess275, and ufish have filled his history with familiar faces and familiar traps.
Then there is x-1890276040, an anonymous opponent made entirely of digits, against whom his record reads a bleak 27-56-9. Every hero has a kryptonite, and his appears to be a username that looks like aWi-Fi password.
The Legend Continues
An 18-game winning streak, a 16-game losing streak, and nearly 58,000 games in between: that is online chess in its purest form. Whether he is birthing birds from the f-file at dawn or refusing to resign in a lost endgame, marcelossauro remains what he has always been: a dinosaur, well adapted, still here, still checking with the queen.