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Seth Vermeulen

Gym Notorious - BJJ Den Haag

W–L
2–6
Won and lost rating-eligible matches in the past 12 months.
Gi
1,236
Rating based on Gi matches in the past 12 months.
No-Gi
1,111
Rating based on No-Gi matches in the past 12 months.
Current form
2–6
Results from the ten most recent rating-eligible matches.
Opponents
7
Unique opponents faced in rating-eligible matches in the past 12 months.

Tournament history

Events

4
Events
Date Event Result Format Division
GrappleCity: Rotterdam Spring Open the Netherlands · Gi · 10–11 yo · grey · ≤40 kg ; No-Gi · 10–11 yo · grey · ≤40 kg 0–4 W–L: Win / Loss GiNo-Gi
  • Place #9
  • Place #5
The Future League 8 – Gi & No-Gi the Netherlands · Gi · ≤19 kg 3–0 W–L: Win / Loss Gi
GrappleCity: Rotterdam Winter Open the Netherlands · Gi · 8–9 yo · grey · ≤40 kg 0–2 W–L: Win / Loss Gi
  • Place #4
'The Future League 4' by VERSUS the Netherlands · Gi · 8–10 yo · grey 1–3 W–L: Win / Loss Gi
  • Place #4

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 1,265

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
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 No new matches Change -1 Rating 1,265

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
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.

June 2026 No new matches Change 0 Rating 1,266

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
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.

May 2026 No new matches Change +10 Rating 1,266

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
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.

April 2026 No new matches Change -2 Rating 1,256

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
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.

March 2026 No new matches Change -4 Rating 1,258

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
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.

February 2026 4 new matches Change +13 Rating 1,262

Rating-period composition

Rating matches
8 +4
Record
2–6 Previous month 2–2
Opponents
7 +3
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
February 22, 2026 Layton Linscheer
GrappleCity: Rotterdam Spring Open Kids Gi / Grey / Kids 10-11 years / -40kg
Method Submission 00:05 0–0
Marginal influence -10
Loss
February 22, 2026 Felicia Rüter
GrappleCity: Rotterdam Spring Open Kids Gi / Grey / Kids 10-11 years / -40kg
Method Submission 00:10 0–0
Marginal influence -11
Loss
February 22, 2026 Noya De Levie
GrappleCity: Rotterdam Spring Open Kids NoGi / Grey / Kids 10-11 years / -40kg
Method Points 03:00 0–8
Marginal influence -14
Loss
February 22, 2026 Felicia Rüter
GrappleCity: Rotterdam Spring Open Kids NoGi / Grey / Kids 10-11 years / -40kg
Method Submission 00:47 0–0
Marginal influence -10
January 2026 No new matches · 3 left period Change +22 Rating 1,249

Rating-period composition

Rating matches
4 -3
Record
2–2 Previous month 2–5
Opponents
4 -3
Events
2 -1

3 older matches left the 12-month period: 0 won and 3 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

December 2025 No new matches Change +1 Rating 1,227

Rating-period composition

Rating matches
7 0
Record
2–5 Previous month 2–5
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.

November 2025 4 new matches Change +97 Rating 1,226

Rating-period composition

Rating matches
7 +4
Record
2–5 Previous month 0–3
Opponents
7 +4
Events
3 +2

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 30, 2025 Tim Scheeren
The Future League 8 – Gi & No-Gi Gi-19
Method Submission 01:25 7–0
Marginal influence +34
Win
November 30, 2025 Senna Mommen
The Future League 8 – Gi & No-Gi Gi-19
Method Submission 01:08 4–0
Marginal influence +25
Loss
November 9, 2025 Jamie Van Der Arend
GrappleCity: Rotterdam Winter Open Kids Gi / Grey / Kids 8-9 years / -40kg
Method Points 03:00 0–12
Marginal influence -22
Loss
November 9, 2025 Jean Riabzev
GrappleCity: Rotterdam Winter Open Kids Gi / Grey / Kids 8-9 years / -40kg
Method Submission 00:34 0–0
Marginal influence -5
October 2025 No new matches Change -5 Rating 1,129

Rating-period composition

Rating matches
3 0
Record
0–3 Previous month 0–3
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 +1 Rating 1,134

Rating-period composition

Rating matches
3 0
Record
0–3 Previous month 0–3
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
6.7
Official ranking percentile
Top 70%
Performance
12.8 pp below expectation

6.7 weighted matches against 7 different opponents across 3 events

Weighted win rate
26.5%
Expected win rate
39.3%
Average opponent rating
1,389
Repeated-opponent share
12.5%
Network connectivity
87.6%

Classification evidence

Why U12?

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

  • U12 1 event vote Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Spring Open
U12 · Counts
Kids NoGi / Grey / Kids 10-11 years / -40kg
  • Competition age 10
  • Registered age: u12
  • Source category: u12
Kids Gi / Grey / Kids 10-11 years / -40kg
  • Competition age 10
  • Registered age: u12
  • Source category: u12
The Future League 8 – Gi & No-Gi
Does not count
Gi-19
  • Competition age 9
  • Registered age: u12
  • Source category: u12
GrappleCity: Rotterdam Winter Open
Does not count
Kids Gi / Grey / Kids 8-9 years / -40kg
  • Competition age 9
  • Registered age: u10
  • Source category: u10

Classification evidence

Why ≤ 40 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

  • ≤ 40 kg 2 competition events Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Spring Open
≤ 40 kg · Counts as a competition event
Kids NoGi / Grey / Kids 10-11 years / -40kg
  • Registered weight class: -40kg
  • Source competition limit: -40kg

2 matches in the rating period

GrappleCity: Rotterdam Spring Open
≤ 40 kg · Counts as a competition event
Kids Gi / Grey / Kids 10-11 years / -40kg
  • Registered weight class: -40kg
  • Source competition limit: -40kg

2 matches in the rating period

The Future League 8 – Gi & No-Gi
Does not count
Gi-19

2 matches in the rating period · weight class could not be normalized reliably

GrappleCity: Rotterdam Winter Open
≤ 40 kg · Counts as a competition event
Kids Gi / Grey / Kids 8-9 years / -40kg
  • Registered weight class: -40kg
  • Source competition limit: -40kg

2 matches in the rating period

Classification evidence

Why Grey?

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

  • grey 6 matches in the rating period Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Spring Open
grey · Counts as a match
Kids Gi / Grey / Kids 10-11 years / -40kg
  • Source belt category: grey

2 matches in the rating period

GrappleCity: Rotterdam Spring Open
grey · Counts as a match
Kids NoGi / Grey / Kids 10-11 years / -40kg
  • Source belt category: grey

2 matches in the rating period

GrappleCity: Rotterdam Winter Open
grey · Counts as a match
Kids Gi / Grey / Kids 8-9 years / -40kg
  • Source belt category: grey

2 matches in the rating period