Introduction
Semion Sapocinic, known online as semion03032009, is a FIDE Master with a serious case of Blitz fever. His preferred time control is Blitz, and his rating story is less a curve and more a rocket launch. A quick look at the chart shows a player who started as an online enthusiast and became a genuine speed chess force.
From kid grinder to FIDE Master
The "03032009" in the username hints at a March 3, 2009 birthday, which means Semion was only a child when he first appeared on the virtual board in 2018. He began near 1427 in Blitz and spent years wandering the 1500 to 1700 wilderness. Then came 2022, a jump past 2100, and by 2023 he crossed 2300. The real sprint arrived in late 2024, and in August 2026 he touched a peak Blitz rating of 3052 (2026-08-20). That number would make many grandmasters nervous.
A marathon man of Blitz
Semion does not play like someone in a hurry. About 79% of his games reach an endgame, and his wins average nearly 80 moves. He rarely resigns early, and his comeback rate sits at a stunning 84%. Even after losing a piece, he still wins around 48% of the time. His best hour according to the data is 03:00, which either means he is a night owl or a vampire with excellent clock management.
He has also seen both sides of momentum. His longest winning streak is 18 games, while his longest losing streak is 11. That losing streak probably funded the winning streak, because chess is a game of swings and Semion knows how to ride them.
Opening repertoire
As White, Semion loves pushing into Sicilian Defense territory and occasionally trots out the cheeky Blackburne Shilling Gambit, a line that ends games in style when the opponent blinks. As Black, he leans on the solid Caro-Kann Defense and meets the London System with the famously venomous Poisoned Pawn Variation. His opening performance chart shows real strength against the Czech Defense and a few bruises from the Amazon Attack.
For the curious, here is a taste of the kind of chaos he enjoys:
Rivalries and repeat customers
No Blitz biography is complete without rivals. Semion has faced chetvertiiprotokol 94 times, winning 56, losing 28 and drawing 10. That is a true online rivalry, and chetvertiiprotokol will likely remember every single game. He has also made life difficult for lilada46, racking up 31 wins against only 2 losses. Others like javicio and positionalvillain keep coming back for more, and the board keeps producing drama.