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Erwin De Jong

Unity99

W–L
2–2
Won and lost rating-eligible matches in the past 12 months.
Gi
-
Rating based on Gi matches in the past 12 months.
No-Gi
1,251
Rating based on No-Gi matches in the past 12 months.
Current form
2–2
Results from the ten most recent rating-eligible matches.
Opponents
4
Unique opponents faced in rating-eligible matches in the past 12 months.

Indexed career

Matches

5
Indexed competition matches
Date Opponent Result Event Division
2026-02-22 Klaas Caeyenberghs
Loss
GrappleCity: Rotterdam Spring Open No-Gi · Teens NoGi / White / 16-17 years / -80kg / Boy
2026-02-22 Sam Wolf
Win
GrappleCity: Rotterdam Spring Open No-Gi · Teens NoGi / White / 16-17 years / -80kg / Boy
2025-11-09 Oumar José
Win
GrappleCity: Rotterdam Winter Open No-Gi · Teens NoGi / White / 14-15 years / -75kg / Boy
2025-11-09 Vince Vlaspoel
Win
GrappleCity: Rotterdam Winter Open No-Gi · Teens NoGi / White / 14-15 years / -75kg / Boy
2025-11-09 Jona Yeboah
Loss
GrappleCity: Rotterdam Winter Open No-Gi · Teens NoGi / White / 14-15 years / -75kg / 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 -5 Rating 1,251

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 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 1,256

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 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 -1 Rating 1,256

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 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 No new matches Change +7 Rating 1,257

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 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.

April 2026 No new matches Change 0 Rating 1,250

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 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.

March 2026 No new matches Change +1 Rating 1,250

Rating-period composition

Rating matches
4 0
Record
2–2 Previous month 2–2
Opponents
4 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 2 new matches Change +33 Rating 1,249

Rating-period composition

Rating matches
4 +2
Record
2–2 Previous month 1–1
Opponents
4 +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
February 22, 2026 Klaas Caeyenberghs
GrappleCity: Rotterdam Spring Open Teens NoGi / White / 16-17 years / -80kg / Boy
Method Points 04:00 0–8
Marginal influence -39
Win
February 22, 2026 Sam Wolf
GrappleCity: Rotterdam Spring Open Teens NoGi / White / 16-17 years / -80kg / Boy
Method Points 04:00 6–2
Marginal influence +37
January 2026 No new matches Change 0 Rating 1,216

Rating-period composition

Rating matches
2 0
Record
1–1 Previous month 1–1
Opponents
2 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.

December 2025 No new matches Change 0 Rating 1,216

Rating-period composition

Rating matches
2 0
Record
1–1 Previous month 1–1
Opponents
2 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.

November 2025 2 new matches Change Starting point Rating 1,216

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
November 9, 2025 Oumar José
GrappleCity: Rotterdam Winter Open Teens NoGi / White / 14-15 years / -75kg / Boy
Method Submission 03:14 2–2
Marginal influence +40
Loss
November 9, 2025 Jona Yeboah
GrappleCity: Rotterdam Winter Open Teens NoGi / White / 14-15 years / -75kg / Boy
Method Submission 01:45 0–6
Marginal influence -32
Relevant matches
3.4
Official ranking percentile
-
Performance
-

3.4 weighted matches against 4 different opponents across 2 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,260
Repeated-opponent share
0.0%
Network connectivity
80.9%

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 2 event votes Selected outcome

Registrations and outcomes

BJJ Dutch Open 2026 NO-GI
Does not count
Adult Male (16+ years) / White belt / -79,5 kg
  • Competition age 16
BTR Grappling Championship 2
Does not count
16-20y / Men / -75kg / 0-9 Months A
  • Competition age 16
Grappling Industries AMSTERDAM
U18 · Counts
No Gi Kids / 14 - 15 years (Male) / Beginner (White and Grey) / -170 lbs
  • Competition age 16
  • Registered age: u16
  • Source category: u16
GrappleCity: Rotterdam Spring Open
U18 · Counts
Teens NoGi / White / 16-17 years / -80kg / Boy
  • Competition age 16
  • Registered age: u18
  • Source category: u18
GrappleCity: Rotterdam Winter Open
Does not count
Teens NoGi / White / 14-15 years / -75kg / Boy
  • Competition age 15
  • Registered age: u16
  • Source category: u16

Classification evidence

Why ≤ 75 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

  • ≤ 75 kg 1 competition event Selected outcome
  • ≤ 80 kg 1 competition event

Registrations and outcomes

BJJ Dutch Open 2026 NO-GI
Does not count
Adult Male (16+ years) / White belt / -79,5 kg
  • Registered weight class: -79,5 kg
  • Source competition limit: -79,5 kg

No matches in the rating period · no valid weight evidence

BTR Grappling Championship 2
Does not count
16-20y / Men / -75kg / 0-9 Months A
  • Registered weight class: -75kg
  • Source competition limit: -75kg

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
Does not count
No Gi Kids / 14 - 15 years (Male) / Beginner (White and Grey) / -170 lbs
  • Registered weight class: -170 lbs
  • Source competition limit: -170 lbs

No matches in the rating period · no valid weight evidence

GrappleCity: Rotterdam Spring Open
≤ 80 kg · Counts as a competition event
Teens NoGi / White / 16-17 years / -80kg / Boy
  • Registered weight class: -80kg
  • Source competition limit: -80kg

2 matches in the rating period

GrappleCity: Rotterdam Winter Open
≤ 75 kg · Counts as a competition event
Teens NoGi / White / 14-15 years / -75kg / Boy
  • Registered weight class: -75kg
  • Source competition limit: -75kg

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

Registrations and outcomes

GrappleCity: Rotterdam Spring Open
white · Counts as a match
Teens NoGi / White / 16-17 years / -80kg / Boy
  • Source belt category: white

2 matches in the rating period

GrappleCity: Rotterdam Winter Open
white · Counts as a match
Teens NoGi / White / 14-15 years / -75kg / Boy
  • Source belt category: white

2 matches in the rating period