Mark Heimann vs Joshua Posthuma
Mark Heimann (33, GM, USA) and Joshua Posthuma (26, IM, USA) have met 8 times in classical OTB. Heimann leads the classical series 3–0 (5 draws). With current classical ratings of 2479 and 2378, the Elo model gives Heimann a 58% chance of winning a classical game with white.
Head-to-Head Score
If they played today · Classical
Based on current Elo: 2479 vs 2378 (Δ +101)
With Mark Heimann as white
58% Mark21% draw21% Joshua
With Joshua Posthuma as white
47% Mark25% draw28% Joshua
Estimate from Elo only · doesn't account for recent form, opening prep, or context.
Career Compare
| Mark Heimann | Joshua Posthuma | |
|---|---|---|
| Current rating (STD) | 2479 | 2378 |
| Peak rating | 2520 · Sep 2025 | 2457 · Apr 2023 |
| Peak age | 32 | 23 |
| World rank now | #743 | #2,077 |
| World rank peak | #461 | #1,060 |
| Federation rank now | #51 | #103 |
| Games (career, STD) | 437 | 576 |
| Months active | 195 | 132 |
| % white wins | 61% | 55% |
| % black wins | 56% | 49% |
| TPR last 12m (STD) | 2403 | 2317 |
| Activity 12m (games) | 91 | 61 |
Best Win
Mark Heimann
Joshua Posthuma
Highest-rated opponent ever beaten · STD primary, rapid/blitz for context
All Meetings (8)
Common Opponents
Tournaments Both Played
Cohort Position
Each player compared to active peers (same federation, ±75 Elo, played in last 12 months).
Mark Heimann
Joshua Posthuma