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Jonah Kallenborn

Chorakee-Gym

W–L
4–3
Won and lost rating-eligible matches in the past 12 months.
Gi
1,207
Rating based on Gi matches in the past 12 months.
No-Gi
1,289
Rating based on No-Gi matches in the past 12 months.
Current form
4–3
Results from the ten most recent rating-eligible matches.
Opponents
7
Unique opponents faced in rating-eligible matches in the past 12 months.

Scheduled

Tournament history

Events

3
Events
Date Event Result Format Division
GrappleCity: Luxembourg Summer Open Luxembourg · Gi · 14–15 yo · white · ≤60 kg ; No-Gi · 16–17 yo · white · ≤60 kg 2–2 W–L: Win / Loss GiNo-Gi
  • Teens Gi / White / 14-15 years / -60kg / Boy
  • Teens NoGi / White / 16-17 years / -60kg / Boy
2026 AGF Saarbrucken Championships Germany · No-Gi · 14–15 yo · white · ≤61.2 kg 1–1 W–L: Win / Loss No-Gi
  • No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
GrappleCity: Luxembourg Spring Open Luxembourg · No-Gi · 14–15 yo · white · ≤60 kg 1–0 W–L: Win / Loss No-Gi
  • Teens NoGi / White / 14-15 years / -60kg / Boy

Calculation details

Rating breakdown for the past 12 months

See the published month-end rating and the rating-eligible matches added in each month. Open a month for details.

August 2026 No new matches Change 0 Rating 1,330

Rating-period composition

Rating matches
7 0
Record
4–3 Previous month 4–3
Opponents
7 0
Events
3 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

July 2026 4 new matches Change +61 Rating 1,330

Rating-period composition

Rating matches
7 +4
Record
4–3 Previous month 2–1
Opponents
7 +4
Events
3 +1

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
July 12, 2026 Nasri Mohamed Dris
GrappleCity: Luxembourg Summer Open Teens Gi / White / 14-15 years / -60kg / Boy
Method Points 04:00 7–8
Marginal influence -11
Win
July 12, 2026 Leandro Machado
GrappleCity: Luxembourg Summer Open Teens Gi / White / 14-15 years / -60kg / Boy
Method Points 04:00 9–2
Marginal influence +6
Win
July 12, 2026 Tristan Salgado
GrappleCity: Luxembourg Summer Open Teens NoGi / White / 16-17 years / -60kg / Boy
Method Submission 00:23 0–0
Marginal influence +19
Loss
July 12, 2026 Gab Bugio
GrappleCity: Luxembourg Summer Open Teens NoGi / White / 16-17 years / -60kg / Boy
Method Submission 02:24 0–11
Marginal influence -21
June 2026 No new matches Change 0 Rating 1,269

Rating-period composition

Rating matches
3 0
Record
2–1 Previous month 2–1
Opponents
3 0
Events
2 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

May 2026 2 new matches Change +26 Rating 1,269

Rating-period composition

Rating matches
3 +2
Record
2–1 Previous month 1–0
Opponents
3 +2
Events
2 +1

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Loss
May 2, 2026 Tim Harth
2026 AGF Saarbrucken Championships No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
Method Submission 03:59 6–10
Marginal influence -23
Win
May 2, 2026 Teo Salas
2026 AGF Saarbrucken Championships No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
Method Submission 02:04 9–5
Marginal influence +20
April 2026 1 new match Change Starting point Rating 1,243

New rating matches

This is a current what-if estimate: roughly how much the current rating changes when this match is omitted. These values cannot be added and therefore do not together explain the monthly change.
Win
April 5, 2026 Una Nesic
GrappleCity: Luxembourg Spring Open Teens NoGi / White / 14-15 years / -60kg / Boy
Method Submission 0–0
Marginal influence +25
Relevant matches
6
Official ranking percentile
-
Performance
4.5 pp above expectation

6 weighted matches against 7 different opponents across 3 events

Weighted win rate
57.7%
Expected win rate
53.2%
Average opponent rating
1,252
Repeated-opponent share
0.0%
Network connectivity
87.6%

Classification evidence

Why U18?

Within the published period from 2025-09-01 through 2026-08-31, only competition ages recorded at events in the calculation year determine this outcome, with at most one vote per event. Without such an age, the most recent unambiguous earlier competition age is projected to the calculation year; bracket evidence is the final fallback. The newest evidence breaks a tie.

Evidence outcome

  • U18 3 event votes Selected outcome

Registrations and outcomes

GrappleCity: Luxembourg Summer Open
U18 · Counts
Teens Gi / White / 14-15 years / -60kg / Boy
  • Competition age 16
  • Registered age: u16
  • Source category: u16
Teens NoGi / White / 16-17 years / -60kg / Boy
  • Competition age 16
  • Registered age: u18
  • Source category: u18
2026 AGF Saarbrucken Championships
U18 · Counts
Competition T-shirt / Youth Small
No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
  • Competition age 16
  • Registered age: u16
  • Source category: u16
GrappleCity: Luxembourg Spring Open
U18 · Counts
Teens NoGi / White / 14-15 years / -60kg / Boy
  • Competition age 16
  • Registered age: u16
  • Source category: u16

Classification evidence

Why ≤ 60 kg?

This outcome uses at most one unambiguous upper weight limit per completed ranking event from 2025-09-01 through 2026-08-31. Only the three most recent eligible events are considered, and the lightest verified upper limit is selected. A higher division is not treated as measured body weight.

Evidence outcome

  • ≤ 60 kg 2 competition events Selected outcome
  • ≤ 61 kg 1 competition event

Registrations and outcomes

GrappleCity: Luxembourg Summer Open
≤ 60 kg · Counts as a competition event
Teens Gi / White / 14-15 years / -60kg / Boy
  • Registered weight class: -60kg
  • Source competition limit: -60kg

2 matches in the rating period

GrappleCity: Luxembourg Summer Open
≤ 60 kg · Counts as a competition event
Teens NoGi / White / 16-17 years / -60kg / Boy
  • Registered weight class: -60kg
  • Source competition limit: -60kg

2 matches in the rating period

2026 AGF Saarbrucken Championships
Does not count
Competition T-shirt / Youth Small

No matches in the rating period · no valid weight evidence

2026 AGF Saarbrucken Championships
≤ 61 kg · Counts as a competition event
No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
  • Registered weight class: Middle II (Up to 61.20 kg)
  • Source competition limit: Middle II (Up to 61.20 kg)

2 matches in the rating period

GrappleCity: Luxembourg Spring Open
≤ 60 kg · Counts as a competition event
Teens NoGi / White / 14-15 years / -60kg / Boy
  • Registered weight class: -60kg
  • Source competition limit: -60kg

1 match in the rating period

Classification evidence

Why White?

This outcome uses the belt category of every rating-eligible match from 2025-09-01 through 2026-08-31. The most-fought category is selected; the newest evidence breaks a tie.

Evidence outcome

  • white 7 matches in the rating period Selected outcome

Registrations and outcomes

GrappleCity: Luxembourg Summer Open
white · Counts as a match
Teens Gi / White / 14-15 years / -60kg / Boy
  • Source belt category: white

2 matches in the rating period

GrappleCity: Luxembourg Summer Open
white · Counts as a match
Teens NoGi / White / 16-17 years / -60kg / Boy
  • Source belt category: white

2 matches in the rating period

2026 AGF Saarbrucken Championships
white · Counts as a match
No Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
  • Source belt category: white

2 matches in the rating period

GrappleCity: Luxembourg Spring Open
white · Counts as a match
Teens NoGi / White / 14-15 years / -60kg / Boy
  • Source belt category: white

1 match in the rating period