Klaus Mertens
GER · FIDE ID 4618815 · 25 tournament games since 2023
Standard
2034
#2683 in GER (active)
Rapid
2039
#1391 in GER (active)
Blitz
–
Unrated
Score
56%
7 W · 14 D · 4 L
Opp. avg
2009
Last 25 games
Last game
2026-08-26
23. Rheinland-Pfalz Senioren Open
Prep summary
- As White: 1.Nf3 in 100% of games (scores 70%).
- Against 1.e4: 1...d6 in 5 of 5 games (Pirc Defense), scoring 70%.
- Against 1.d4: 1...Nf6 in 6 of 6 games (Indian Defense), scoring 25%.
- By opponent strength: 33% against higher-rated players, 64% against lower-rated.
- By colour: 70% with White, 47% with Black.
- Drawish: 56% of games end in a draw.
Based on 25 over-the-board games. 10 with White (70%), 15 with Black (47%).
Openings as White
First move
| 1.Nf3 | 10 | 70% |
Most played
| Opening | Games | Score |
|---|---|---|
| King's Indian Attack | 2 | 75% |
| King's Indian Defense: Fianchetto Variation | 1 | 50% |
| King's Indian Attack: Symmetrical Defense | 1 | 50% |
| English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense | 1 | 100% |
| King's Indian Attack: Sicilian Variation | 1 | 50% |
Openings as Black
Against 1.e4 (5 games)
| 1...d6 Pirc Defense | 5 | 70% |
Against 1.d4 (6 games)
| 1...Nf6 Indian Defense | 6 | 25% |
Most played
| Opening | Games | Score |
|---|---|---|
| Czech Defense | 4 | 63% |
| Indian Defense: Wade-Tartakower Defense | 2 | 50% |
| English Opening: Symmetrical Variation, Four Knights Variation | 1 | 50% |
| Catalan Opening | 1 | 50% |
| Pseudo Queen's Indian Defense | 1 | 0% |
Recent games
| Date | Opponent and event | Result |
|---|---|---|
| 2026-08-26 | Paul Stuemer (2003) 23. Rheinland-Pfalz Senioren Open | ½ |
| 2026-08-25 | Bernd Schaefer (1974) 23. Rheinland-Pfalz Senioren Open | ½ |
| 2026-08-24 | Helmut Kalepky (1925) 23. Rheinland-Pfalz Senioren Open | ½ |
| 2026-08-23 | Halil Tozaki (1875) 23. Rheinland-Pfalz Senioren Open | W |
| 2026-08-22 | Andreas Kuhn (1855) 23. Rheinland-Pfalz Senioren Open | ½ |
| 2026-08-21 | Nedjeljko Busic (1866) 23. Rheinland-Pfalz Senioren Open | ½ |
| 2026-08-20 | Udo Steingrobe (1968) 23. Rheinland-Pfalz Senioren Open | L |
| 2026-08-19 | Ingeborg Best (1817) 23. Rheinland-Pfalz Senioren Open | W |
| 2026-08-18 | Ronald Beuger (1821) 23. Rheinland-Pfalz Senioren Open | ½ |
| 2025-09-25 | Lutz Mueller (1908) German Senior Team Championship of the State Associations | S65 | ½ |
Data: FIDE rating list (October 2026 list; national ranks count active players) and tournament games broadcast on Lichess since 2020 (open data, CC0). Results are matched to FIDE players by name or FIDE ID and may be incomplete. This page shows public chess results only. Is this you and you want the page removed? Email chessmoose1@gmail.com and we remove it.