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Bosse De Jonge

Haven BJJ

W–L
3–3
Won and lost rating-eligible matches in the past 12 months.
Gi
1,251
Rating based on Gi matches in the past 12 months.
No-Gi
-
Rating based on No-Gi matches in the past 12 months.
Current form
3–3
Results from the ten most recent rating-eligible matches.
Opponents
6
Unique opponents faced in rating-eligible matches in the past 12 months.

Indexed career

Matches

9
Indexed competition matches
Date Opponent Result Event Division
2026-05-09 Younes Lashkari
Win
Lion Cub Jiu Jitsu Competition 6 Gi · Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
2026-05-09 Kyano Panday
Loss
Lion Cub Jiu Jitsu Competition 6 Gi · Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
2026-05-09 Jayvo Hermans
Win
Lion Cub Jiu Jitsu Competition 6 Gi · Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
2026-05-09 Adrian Maier
Win
Lion Cub Jiu Jitsu Competition 6 Gi · Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
2025-11-09 Damin Ahamed
Loss
GrappleCity: Rotterdam Winter Open Gi · Kids Gi / Grey / Kids 6-7 years / -30kg
2025-11-09 Jayden Durivou
Loss
GrappleCity: Rotterdam Winter Open Gi · Kids Gi / Grey / Kids 6-7 years / -30kg
2025-04-19 Floris Jacobs
Loss
Lion Cub Jiu Jitsu Competition 4 Gi · Boys GI / 7 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
2025-04-19 Anis Boukhzar
Win
Lion Cub Jiu Jitsu Competition 4 Gi · Boys GI / 7 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
2025-04-19 Finn Peniguel-Kleinekoort
Win
Lion Cub Jiu Jitsu Competition 4 Gi · Boys GI / 7 years old (DAY 2: Sunday) / White belt / -30 & -34 kg

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 1,251

Rating-period composition

Rating matches
6 0
Record
3–3 Previous month 3–3
Opponents
6 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.

July 2026 No new matches Change 0 Rating 1,251

Rating-period composition

Rating matches
6 0
Record
3–3 Previous month 3–3
Opponents
6 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.

June 2026 No new matches Change 0 Rating 1,251

Rating-period composition

Rating matches
6 0
Record
3–3 Previous month 3–3
Opponents
6 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 4 new matches Change +141 Rating 1,251

Rating-period composition

Rating matches
6 +4
Record
3–3 Previous month 0–2
Opponents
6 +4
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.
Win
May 9, 2026 Younes Lashkari
Lion Cub Jiu Jitsu Competition 6 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
Method Submission 01:04 13–0
Marginal influence +20
Loss
May 9, 2026 Kyano Panday
Lion Cub Jiu Jitsu Competition 6 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
Method Points 01:35 0–14
Marginal influence -19
Win
May 9, 2026 Jayvo Hermans
Lion Cub Jiu Jitsu Competition 6 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
Method Points 03:00 9–0
Marginal influence +25
Win
May 9, 2026 Adrian Maier
Lion Cub Jiu Jitsu Competition 6 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
Method Decision 03:00 0–0
Marginal influence +39
April 2026 No new matches · 3 left period Change -102 Rating 1,110

Rating-period composition

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

3 older matches left the 12-month period: 2 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

March 2026 No new matches Change +1 Rating 1,212

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
5 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.

February 2026 No new matches Change 0 Rating 1,211

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
5 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.

January 2026 No new matches Change -1 Rating 1,211

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
5 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.

December 2025 No new matches Change +1 Rating 1,212

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
5 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.

November 2025 2 new matches Change -44 Rating 1,211

Rating-period composition

Rating matches
5 +2
Record
2–3 Previous month 2–1
Opponents
5 +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
November 9, 2025 Damin Ahamed
GrappleCity: Rotterdam Winter Open Kids Gi / Grey / Kids 6-7 years / -30kg
Method Points 03:00 0–13
Marginal influence -15
Loss
November 9, 2025 Jayden Durivou
GrappleCity: Rotterdam Winter Open Kids Gi / Grey / Kids 6-7 years / -30kg
Method Decision 03:00 2–2
Marginal influence -50
October 2025 No new matches Change +16 Rating 1,255

Rating-period composition

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

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

September 2025 No new matches Change 0 Rating 1,239

Rating-period composition

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

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

Relevant matches
4.5
Official ranking percentile
Top 74%
Performance
-

4.5 weighted matches against 6 different opponents across 2 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,268
Repeated-opponent share
0.0%
Network connectivity
87.6%

Classification evidence

Why U10?

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

  • U10 1 event vote Selected outcome

Registrations and outcomes

Lion Cub Jiu Jitsu Competition 6
U10 · Counts
Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
  • Competition age 8
  • Registered age: u10
  • Source category: u10
GrappleCity: Rotterdam Winter Open
Does not count
Kids Gi / Grey / Kids 6-7 years / -30kg
  • Competition age 7
  • Registered age: u8
  • Source category: u8

Classification evidence

Why ≤ 30 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

  • ≤ 30 kg 1 competition event Selected outcome
  • ≤ 34 kg 1 competition event

Registrations and outcomes

Lion Cub Jiu Jitsu Competition 6
≤ 34 kg · Counts as a competition event
Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
  • Registered weight class: -34 kg
  • Source competition limit: -34 kg

4 matches in the rating period

GrappleCity: Rotterdam Winter Open
≤ 30 kg · Counts as a competition event
Kids Gi / Grey / Kids 6-7 years / -30kg
  • Registered weight class: -30kg
  • Source competition limit: -30kg

2 matches 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 4 matches in the rating period Selected outcome
  • grey 2 matches in the rating period

Registrations and outcomes

Lion Cub Jiu Jitsu Competition 6
white · Counts as a match
Boys GI / 8 & 9 years old (DAY 2: Sunday) / White belt / -30 & -34 kg
  • Source belt category: white

4 matches in the rating period

GrappleCity: Rotterdam Winter Open
grey · Counts as a match
Kids Gi / Grey / Kids 6-7 years / -30kg
  • Source belt category: grey

2 matches in the rating period