Calvin John Klaasen vs Jan Karsten
Calvin John Klaasen (39, FM, RSA) and Jan Karsten (18, IM, RSA) have met 7 times in classical OTB. Karsten leads the classical series 4–1 (2 draws). With current classical ratings of 2177 and 2382, the Elo model gives Karsten a 64% chance of winning a classical game with white.
Head-to-Head Score
If they played today · Classical
Based on current Elo: 2177 vs 2382 (Δ -205)
With Calvin John Klaasen as white
18% Calvin18% draw64% Jan
With Jan Karsten as white
13% Calvin15% draw72% Jan
Estimate from Elo only · doesn't account for recent form, opening prep, or context.
Career Compare
| Calvin John Klaasen | Jan Karsten | |
|---|---|---|
| Current rating (STD) | 2177 | 2382 |
| Peak rating | 2320 · Jan 2018 | 2385 · Jun 2025 |
| Peak age | 31 | 17 |
| World rank now | #9,449 | #1,994 |
| World rank peak | #4,328 | #1,945 |
| Federation rank now | #19 | #2 |
| Games (career, STD) | 623 | 304 |
| Months active | 193 | 56 |
| % white wins | 45% | 57% |
| % black wins | 43% | 52% |
| TPR last 12m (STD) | 2149 | 2377 |
| Activity 12m (games) | 23 | 29 |
Best Win
Calvin John Klaasen
Jan Karsten
Highest-rated opponent ever beaten · STD primary, rapid/blitz for context
All Meetings (7)
Common Opponents
Tournaments Both Played
Cohort Position
Each player compared to active peers (same federation, ±75 Elo, played in last 12 months).
Calvin John Klaasen
Jan Karsten