Format
Koellner, Ruben Gideon
IM🇩🇪FIDE 12993093· Male· Germany· Born in 2004
Follow Ruben Gideon KoellnerTrack his monthly FIDE ratings, games, tournaments and more.
Ruben Gideon Koellner, a 22-year-old German International Master, is rated 2531 and ranked 22nd among German players, and 396th worldwide. He is on a steady climb with +27 Elo over the past 12 months. 107 rated games in the past year (≈103/year long-term). Recent standard appearances include 1. Schachbundesliga 2025-2026 April 2026, grenke Chess Open 2026 A-Open, and 1. Muenster Oster Open - A. Also played 2 rapid events (including Grand Prix PlusCity - Open Austrian Team Rapid Championship 2025) recently. He reached World #408 in May 2026.
Awarded IM in 2021 (age 17) and FM in 2019 (age 15). Earned a GM norm at 1st International Munich Whitsun-Open A 2023. At junior level, he reached World #31 in U20, World #26 in U18, World #31 in U16, World #55 in U14, World #23 in U12 and #18 nationally in U10.
Current rating
2531
Standard
Rpd2425·Blz2384
All-time high
2531
at best
Jun 2026 · age 22
Jun 2026 · age 22
Activity
109
games / yr avg. · ≈9/mo
78 past 12 mo · ≈7/mo
classical only
Very active
classical only
Very active
Signature stat
#22
#22 · German players · of 14,156
Career timeline
22 entries2026
Peak German rank: #21
at age 22 · rated 2530
May 2026
Peak World rank: #408
at age 22 · rated 2530
May 2026
All-time peak 2530
at age 22
May 2026
2025
Crossed 2500
at age 21
May 2025
2024
1,000 career games
at age 20
Sep 2024
31st U20 player worldwide
at age 20 · rated 2490
Aug 2024
Standard rating history
Peak
FIDE title
Threshold
First rated
COVID-19
Activity & highlights
Top opponent
Evolution
+21
2510 → 2531
Tournaments
14
69 games
Score
48.5/ 6970.3%
34W29D6L
Top 3 wins
Top 3 losses
Last 12 months — tournaments
14 events| Event | Date | Score | Rank | Perf | Δ Elo |
|---|---|---|---|---|---|
Round-Robin | May 2026 | 7.5/9 | #1 | 2537 | +1.0 |
Team | Apr 2026 | 2.5/3 | #3 | 2674 | +5.4 |
Open Swiss | Apr 2026 | 7.5/9 | #4 | 2648 | +15.1 |
Open Swiss | Mar 2026 | 6.5/8 | #3 | 2537 | +3.1 |
Team | Mar 2026 | 1/3 | #78 | 2355 | -6.5 |
Team | Feb 2026 | 0.5/1 | #117 | 2504 | -0.1 |
Team | Feb 2026 | 1/2 | #79 | 2468 | -1.3 |
Team | Jan 2026 | 2/2 | #4 | 3191 | +6.6 |
Team | Jan 2026 | 0.5/2 | #103 | 2284 | -6.1 |
Round-Robin | Dec 2025 | 7/9 | #2 | 2489 | -1.0 |
Hot streak: 4 tournaments without losing Elo.
Most-Played Opponents
vsAlexander KrastevIM
🇩🇪GER·2427
+1 −3 =4
8 games·last met May 2025
View head-to-head →
vsAaron Noah KoellnerCM
🇩🇪GER·2204
+5 −1 =1
7 games·last met Mar 2023
View head-to-head →
vsJonathan CarlstedtIM
🇩🇪GER·2430
+0 −2 =4
6 games·last met Mar 2025
View head-to-head →
vsCedric ChassardFM
🇩🇪GER·2190
+4 −0 =1
5 games·last met Mar 2026
View head-to-head →
vsAshot ParvanyanIM
🇩🇪GER·2441
+2 −3 =0
5 games·last met Mar 2025
View head-to-head →
Rankings
/
Germany
#22
out of 15,549 players
Europe
#225
in continent
World
#396
out of 400,000+
National ranking
Europe & World
Europe
World
Germany
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