The Mouse That Roared
Meet Matthias Dann, known around the chess servers as Maus7. The "Maus" might suggest something small and squeaky, but his results are anything but. As a FIDE International Master, Matthias has spent years turning the board into his personal playground, and his blitz record shows a player who simply refuses to stay quiet. If you see the mouse at your table, you may want to bring a big cat.
Matthias is a blitz specialist at heart. He is the kind of player who treats three minutes like a marathon and a mouse click like a thunderclap. His profile screams energy, with hundreds of decisive games and a style built on pressure, tactics, and an almost unreasonable love for forcing lines.
Climbing the Ladder
Matthias did not start out as a 2800-level monster. In October 2019 he was navigating the blitz pool alongside the masses, but within a few months he cracked 2400, and by February 2020 he was already hovering near 2500. Then came the real charge. Through 2024 and 2025, Maus7 went from dangerous expert to genuine online powerhouse, peaking at an eye watering 2816 (2025-11-25) blitz rating.
The trajectory is a reminder that online ratings can move fast when talent meets volume. Hundreds of blitz games, an 18-game winning streak, and a comeback rate that would make a Hollywood screenwriter blush. Matthias does not just win; he rises from the ashes, often when the engine already thinks he is done.
Repertoire and Style
When Matthias has the white pieces, he overwhelmingly reaches for 1.e4. This is a player who wants open lines, active pieces, and a game that feels like a sword fight. He loves facing the Sicilian Defense, and within that jungle he is especially at home in the razor sharp Najdorf Variation. With 69 recorded Najdorf battles, he has seen both the poison and the medicine, and he still comes back for more.
As Black, Matthias is equally ambitious. He regularly answers 1.e4 with the Scandinavian Defense, a choice that often makes his opponents blink twice. It works more often than not, with a 65.5% win rate in blitz. He also handles the Caro-Kann Defense and the French Defense with real familiarity, especially the Advance Variation, where he has ground out a steady plus score as White.
Style-wise, Maus7 is a fighter. His first capture usually happens around move six, his games average more than 80 moves per win, and he delivers the first check in 56% of his games. He is the kind of player who makes you solve problems until the clock or the position finally cracks.
Rivalries and Repeat Customers
You cannot play this many blitz games without making a few friends and a few enemies. Matthias has a particularly spicy history with several regulars. He has dominated babylyonbeast with a perfect 9 wins in 9 games, which is less a rivalry and more a friendly mugging. He has also had the better of Spapan and 3riksson, though 3riksson did manage to take two wins off him.
Then there are the players who give the mouse nightmares. Against Matvey Galchenko, Matthias has lost all six meetings, a hoodoo that probably appears in his dreams. Maksim Chigaev has also had the better of their battles, holding him winless after four games. No player is invincible, but those two clearly know where Maus7 keeps the cheese.
Quirks of the Maus
- Prime time: His best hour is 20:00, when his win rate jumps to a frightening 85.7%. If you queue at that hour, you are volunteering for the experiment.
- Fight to the end: He wins 55% of games even after losing a piece. Giving up material against Maus7 is not a shortcut to victory; it is an invitation to a counterattack.
- One-sided losses are rare: His one-sided loss rate is just over 1%, meaning he almost always makes a fight of it.
- Draws are the exception: In 919 recorded blitz games, only 73 ended peacefully. He would rather lose on time than shake hands in a quiet position.
- Tilt factor: His tilt factor sits at 8, which is not ideal, but his comeback rate of 88.6% suggests he does his best brooding after a setback. Give him a bad beat, and he might simply win the next eight.
Verdict
Matthias Dann, or Maus7, is the kind of online blitz player who makes the ladder feel alive. He is an International Master with an online rating that sometimes looks like a typo, a warrior in the Najdorf, and a permanent threat to anyone who underestimates the mouse. Whether he is breaking a winning streak or grinding out a comeback after giving up a piece, one thing is certain: the games are never boring.
So the next time you see Maus7 in the queue, remember the numbers behind the name. The mouse has claws.