Candidate Master with a Busy Queue
Oskar Kiszkiel, known on the board as marysiakos, is a FIDE Candidate Master who plays online chess like someone trying to solve every opening mystery at once. His preferred habitat is Blitz, but his stats suggest an equally passionate, slightly chaotic relationship with Bullet.
In the 2026 season alone he racked up over 5,700 rated games, touched a Blitz peak of 2886 (2026-06-08), a Rapid ceiling of 2684 (2026-05-07), and a Bullet explosion of 2977 (2026-08-28). His rating graph is less a steady climb and more a rollercoaster with a chess engine on board: [[Chart|Rating|Blitz|2026-1-2026-8]].
Playing Style: Patience at Warp Speed
Oskar's games are long even when they are fast. His wins average over 81 moves, and more than 80 percent of his games reach the endgame. He plays 1.e4 with conviction, often steering into sharp territory. If he delivers the first check, he converts 61 percent of the time, and his most common checking piece is a rook, because subtlety is for other people.
His comeback rate is an absurd 89.35 percent, so a marysiakos game is never over until the last flag falls. He also plays significantly better at 1 a.m., when his win rate jumps to 88.89 percent, which may or may not be legal in some jurisdictions.
Signature Openings
If you want to prepare for Oskar, do not bother with a narrow repertoire. As White he almost always opens with 1.e4 and has deep experience in the Sicilian Defense, including the sharp Alapin Variation. As Black, he is at home in the Alekhine Defense and the Scandinavian Defense. He also regularly finds himself in the Caro-Kann Defense, the Nimzo-Larsen Attack, and the wonderfully weird Rhamphorhynchus Variation. If the Barnes Defense shows up, he does not run away; he plays on, and his Bullet record against it is a healthy 65.81 percent.
Rivalries and Recurring Characters
No player has seen more of marysiakos than Kacper Klys. Their 314 games make them practically family, with Oskar holding a 156-124 edge in a rivalry that has everything, including 34 draws. Against henioworowski, the story is less balanced: 153 wins and only 35 losses for Oskar, which is less a rivalry and more a charitable donation. Then there is cmjose11, whose 172 games have produced a more contested 91-53 record with 28 draws.
Numbers That Sound Made Up
- Longest winning streak: 15; longest losing streak: 9, because balance is important.
- White win rate: 55.84 percent; Black win rate: 50.93 percent.
- Against higher-rated opponents he wins 28.65 percent of the time and against lower-rated players 62.96 percent, so he is dangerous in both directions.
- He prefers Tuesday and 1 a.m., which is a very specific lifestyle.
- His endgame frequency of 80.76 percent means he is comfortable grinding out rook endgames until the cows come home. The cows are usually the rooks.
Final Word
Oskar Kiszkiel, Candidate Master, username marysiakos, is the kind of online chess player who turns every match into an improvised opening lecture and a speedrun at the same time. Whether you meet him in Blitz, Bullet, or Rapid, be ready for 1.e4, a strange variation, and a fight that lasts longer than expected. And if it is 1 a.m. on a Tuesday, maybe just resign now and save yourself the trouble.