Ruben Gideon Koellner vs Jonathan Carlstedt
Ruben Gideon Koellner (22, IM, GER) and Jonathan Carlstedt (36, IM, GER) have met 6 times in classical OTB. Carlstedt leads the classical series 2–0 (4 draws). With current classical ratings of 2530 and 2437, the Elo model gives Koellner a 57% chance of winning a classical game with white.
Head-to-Head Score
If they played today · Classical
Based on current Elo: 2530 vs 2437 (Δ +93)
With Ruben Gideon Koellner as white
57% Ruben22% draw21% Jonathan
With Jonathan Carlstedt as white
45% Ruben26% draw29% Jonathan
Estimate from Elo only · doesn't account for recent form, opening prep, or context.
Career Compare
| Ruben Gideon Koellner | Jonathan Carlstedt | |
|---|---|---|
| Current rating (STD) | 2530+24 | 2437+6 |
| Peak rating | 2530 · May 2026 | 2475 · Mar 2015 |
| Peak age | 22 | 25 |
| World rank now | #408 | #1,157 |
| World rank peak | #408 | #941 |
| Federation rank now | #21 | #70 |
| Games (career, STD) | 1,190 | 1,475 |
| Months active | 138 | 204 |
| % white wins | 53% | 55% |
| % black wins | 46% | 49% |
| TPR last 12m (STD) | 2513 | 2383 |
| Activity 12m (games) | 150 | 49 |
Best Win
Ruben Gideon Koellner
Jonathan Carlstedt
Highest-rated opponent ever beaten · STD primary, rapid/blitz for context
All Meetings (6)
Common Opponents
Tournaments Both Played
Cohort Position
Each player compared to active peers (same federation, ±75 Elo, played in last 12 months).
Ruben Gideon Koellner
Jonathan Carlstedt