Overview — Martin Fierz (Senn71)
Martin Fierz, known online as Senn71, is a FIDE Master and a seasoned online competitor with a clear love for fast chess. A declared Bullet specialist, Martin combines long, strategic thinking with lightning fast execution when the clock is tiny. His play is a mix of tactical ferocity and stubborn endgame technique, which makes him entertaining to watch and hard to finish off.
Playing Style and Strengths
Martin is the kind of player who makes the middlegame feel like a puzzle and the endgame like a comfortable walk. Key traits:
- High tactical awareness and comeback ability. He converts difficult positions into wins at an impressive rate.
- Long average games. Many wins and losses stretch into lengthy, workmanlike fights rather than quick blunders.
- Strong under time pressure. Preferred time control: Bullet. He also performs extremely well in Blitz.
- Optimized play in the morning. His best hour is around 09:00 according to his time-of-day trends.
Openings and Repertoire
Martin has a practical and varied opening toolkit. Below are some standout systems he often deploys, with results that reveal where he feels most confident.
- Caro-Kann Defense — reliable and effective as both White and Black, especially in Bullet.
- London System: Poisoned Pawn Variation — a potent weapon when he wants a solid but sharp game from move one.
- Sicilian family — Najdorf, Taimanov and Accelerated Dragon all feature in his repertoire, showing he is comfortable in complex, asymmetrical battles.
- Four Knights Game: Spanish Variation — a surprisingly frequent choice with a strong win rate.
Representative openings from recent play (games and win rates):
- Caro-Kann Defense (Bullet): Games: 9, WinRate: 66.67%
- London System: Poisoned Pawn (Bullet): Games: 5, WinRate: 80%
- Sicilian Najdorf (Blitz): Games: 108, WinRate: 50.93%
- Four Knights Spanish Variation (Blitz): Games: 224, WinRate: 49.11%
Career Highlights and Titles
Martin holds the FIDE Master title and has steadily built a reputation as a top online Blitz and Bullet competitor. Highlights include strong tournament runs and several hot streaks that showcased both tactical flair and endurance in long event schedules.
- FIDE Master title achieved and reliably defended in rapid online settings.
- Notable peak achievements: 2448 (2025-07-07) and 2257 (2025-08-29).
- Impressive tactical metrics: high comeback rate and a very healthy win conversion in key moments.
Records, Streaks and Tendencies
Martin is a decisive player who rarely settles for draws. He has enjoyed long winning runs and has shown resilience through losing stretches.
- Longest winning streak recorded: 15 games.
- Best performing hours and days: morning hours shine, with one standout hour registering an exceptional win rate.
- Psychology: moderate tilt factor and excellent comeback skill make him dangerous even when behind on the clock or on material.
Fun Facts, Memorable Games and Extras
Martin mixes serious preparation with an online playground mentality. Expect both deep theoretical lines and cheeky tactical shots.
- Preferred time control: Bullet. He treats 1+0 like a sprint that still requires marathon stamina.
- Sample game to study: View Game.
- Playthrough for a quick tactical motif: .
- See a compact visual of recent Bullet progress: .
- Want to check some frequent rivals or sparring partners: friedrichii and al_ef13.
Why Follow Martin Fierz
For fans of sharp, long-deciding skirmishes delivered at breakneck speed, Martin is a must-watch. He blends opening knowledge, tactical punch, and stubborn endgame play. If you enjoy Bullet fireworks and practical, instructive games, following Senn71 will be rewarding and often amusing.