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Jamie Van Der Arend

Unity99

W–L
8–9
Won and lost rating-eligible matches in the past 12 months.
Gi
1,329
Rating based on Gi matches in the past 12 months.
No-Gi
1,202
Rating based on No-Gi matches in the past 12 months.
Current form
6–4
Results from the ten most recent rating-eligible matches.
Opponents
13
Unique opponents faced in rating-eligible matches in the past 12 months.

Scheduled

Tournament history

Events

9
Events
Date Event Result Format Division
GrappleCity: Rotterdam Summer Open the Netherlands · Gi · 10–11 yo · grey · ≤40 kg 1–1 W–L: Win / Loss Gi
  • Kids Gi / Grey / Kids 10-11 years / -40kg
2026 AGF Netherlands Championships the Netherlands · Gi · 8–9 yo · grey · ≤43.1 kg ; No-Gi · 8–9 yo · grey · ≤43.1 kg 4–0 W–L: Win / Loss GiNo-Gi
  • No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
The Future League 9 - Gi & NoGi the Netherlands · Gi · ≤40 kg 0–3 W–L: Win / Loss Gi
  • Place #4
GrappleCity: Rotterdam Winter Open the Netherlands · Gi · 8–9 yo · grey · ≤40 kg 1–1 W–L: Win / Loss Gi
  • Kids Gi / Grey / Kids 8-9 years / -40kg
Lion Cub Jiu Jitsu Competition 5 the Netherlands · Gi · 8–9 yo · white/grey/yellow · ≤38 kg ; No-Gi · 8–9 yo · grey/yellow · ≤34/38 kg 2–4 W–L: Win / Loss GiNo-Gi
  • Place #4
  • Boys NO-GI / 8 & 9 years old (DAY 2: Sunday) / Grey & Yellow belt / -34 & -38 kg
Grappling Industries AMSTERDAM the Netherlands · Gi · 8–9 yo · grey · ≤85 lb ; No-Gi · 8–9 yo · grey · ≤85 lb 1–3 W–L: Win / Loss GiNo-Gi
  • Gi Kids / Grey / 8 - 9 years / -85 lbs
  • No Gi Kids / Intermediate (Grey) / 8 - 9 years / -85 lbs
Lion Cub Jiu Jitsu Competition 4 the Netherlands · Gi · 7–8 yo · white/grey · ≤34/38 kg 1–2 W–L: Win / Loss Gi
  • Boys GI / 7 & 8 years old (DAY 2: Sunday) / White & Grey belt / -34 & -38 kg
'The Future League 5' by VERSUS the Netherlands · Gi · 8–9 yo · ≤38 kg 0–3 W–L: Win / Loss Gi
  • Place #4
'The Future League 4' by VERSUS the Netherlands · Gi · 8–10 yo · white 1–2 W–L: Win / Loss Gi
  • 8 - 10 years boys & girls / White / -34 & -38

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 · 4 left period Change -3 Rating 1,350

Rating-period composition

Rating matches
17 -4
Record
8–9 Previous month 9–12
Opponents
13 -2
Events
5 -1

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

July 2026 No new matches Change -2 Rating 1,353

Rating-period composition

Rating matches
21 0
Record
9–12 Previous month 9–12
Opponents
15 0
Events
6 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 1,355

Rating-period composition

Rating matches
21 0
Record
9–12 Previous month 9–12
Opponents
15 0
Events
6 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 +17 Rating 1,356

Rating-period composition

Rating matches
21 +2
Record
9–12 Previous month 8–11
Opponents
15 +2
Events
6 +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 23, 2026 Layton Linscheer
GrappleCity: Rotterdam Summer Open Kids Gi / Grey / Kids 10-11 years / -40kg
Method Submission 00:28 0–0
Marginal influence -11
Win
GrappleCity: Rotterdam Summer Open Kids Gi / Grey / Kids 10-11 years / -40kg
Method Submission 01:54 0–0
Marginal influence +10
April 2026 4 new matches · 3 left period Change +49 Rating 1,339

Rating-period composition

Rating matches
19 +1
Record
8–11 Previous month 5–13
Opponents
13 -2
Events
5 0

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

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 18, 2026 Yuşa Sari
2026 AGF Netherlands Championships No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
Method Submission 01:43 9–2
Marginal influence +6
Win
April 18, 2026 Yuşa Sari
2026 AGF Netherlands Championships No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
Method Submission 01:55 15–2
Marginal influence +6
Win
April 18, 2026 Yuşa Sari
2026 AGF Netherlands Championships Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
Method Submission 02:02 13–2
Marginal influence +10
Win
April 18, 2026 Yuşa Sari
2026 AGF Netherlands Championships Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
Method Submission 02:16 8–2
Marginal influence +10
March 2026 3 new matches Change -20 Rating 1,290

Rating-period composition

Rating matches
18 +3
Record
5–13 Previous month 5–10
Opponents
15 +3
Events
5 +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
March 22, 2026 Sebastian Hermans
The Future League 9 - Gi & NoGi Gi - 40
Method Submission 02:50 0–5
Marginal influence -16
Loss
March 22, 2026 Hamza Chouhou
The Future League 9 - Gi & NoGi Gi - 40
Method Submission 00:13 0–0
Marginal influence -5
Loss
March 22, 2026 Luca Oprea
The Future League 9 - Gi & NoGi Gi - 40
Method Points 03:00 2–4
Marginal influence -13
February 2026 No new matches Change -2 Rating 1,310

Rating-period composition

Rating matches
15 0
Record
5–10 Previous month 5–10
Opponents
12 0
Events
4 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 · 3 left period Change -4 Rating 1,312

Rating-period composition

Rating matches
15 -3
Record
5–10 Previous month 6–12
Opponents
12 -3
Events
4 -1

3 older matches left the 12-month period: 1 won and 2 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 1,316

Rating-period composition

Rating matches
18 0
Record
6–12 Previous month 6–12
Opponents
15 0
Events
5 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 +24 Rating 1,315

Rating-period composition

Rating matches
18 +2
Record
6–12 Previous month 5–11
Opponents
15 +2
Events
5 +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
November 9, 2025 Seth Vermeulen
GrappleCity: Rotterdam Winter Open Kids Gi / Grey / Kids 8-9 years / -40kg
Method Points 03:00 12–0
Marginal influence +17
Loss
November 9, 2025 Mohamed Amin Belahcen
GrappleCity: Rotterdam Winter Open Kids Gi / Grey / Kids 8-9 years / -40kg
Method Submission 01:56 0–3
Marginal influence -8
October 2025 6 new matches Change +8 Rating 1,291

Rating-period composition

Rating matches
16 +6
Record
5–11 Previous month 3–7
Opponents
13 +5
Events
4 +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
October 25, 2025 Mohammad Imraan Ahmadi
Lion Cub Jiu Jitsu Competition 5 Boys NO-GI / 8 & 9 years old (DAY 2: Sunday) / Grey & Yellow belt / -34 & -38 kg
Method Points 03:00 0–2
Marginal influence -10
Loss
October 25, 2025 Rheyven Tsang
Lion Cub Jiu Jitsu Competition 5 Boys NO-GI / 8 & 9 years old (DAY 2: Sunday) / Grey & Yellow belt / -34 & -38 kg
Method Submission 00:50 0–6
Marginal influence -11
Win
October 25, 2025 Namyr Badaoui
Lion Cub Jiu Jitsu Competition 5 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
Method Disqualification 01:26 0–9
Marginal influence +23
Loss
October 25, 2025 Rheyven Tsang
Lion Cub Jiu Jitsu Competition 5 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
Method Submission 00:08 0–0
Marginal influence -14
Loss
October 25, 2025 Muhammad Hotak
Lion Cub Jiu Jitsu Competition 5 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
Method Submission 00:41 0–2
Marginal influence -9
Win
October 25, 2025 Daniël Van Gampelaere
Lion Cub Jiu Jitsu Competition 5 Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
Method Submission 00:41 7–0
Marginal influence +14
September 2025 No new matches Change -2 Rating 1,283

Rating-period composition

Rating matches
10 0
Record
3–7 Previous month 3–7
Opponents
8 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.

Relevant matches
12.5
Official ranking percentile
Top 44%
Performance
2.8 pp above expectation

12.5 weighted matches against 13 different opponents across 5 events

Weighted win rate
43.7%
Expected win rate
40.9%
Average opponent rating
1,368
Repeated-opponent share
23.5%
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 3 event votes Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
U10 · Counts
Kids NoGi / Grey / Kids 10-11 years / -40kg
  • Competition age 9
  • Registered age: u12
  • Source category: u12
Kids Gi / Grey / Kids 10-11 years / -40kg
  • Competition age 9
  • Registered age: u12
  • Source category: u12
2026 AGF Netherlands Championships
U10 · Counts
Competition T-shirt / Youth Large
Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • Competition age 9
  • Registered age: u10
  • Source category: u10
No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • Competition age 9
  • Registered age: u10
  • Source category: u10
The Future League 9 - Gi & NoGi
U10 · Counts
Gi - 40
  • Competition age 9
  • Registered age: u14
  • Source category: u14
GrappleCity: Rotterdam Winter Open
Does not count
Kids Gi / Grey / Kids 8-9 years / -40kg
  • Competition age 8
  • Registered age: u10
  • Source category: u10
Lion Cub Jiu Jitsu Competition 5
Does not count
Boys NO-GI / 8 & 9 years old (DAY 2: Sunday) / Grey & Yellow belt / -34 & -38 kg
  • Competition age 8
  • Registered age: u10
  • Source category: u10
Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
  • Competition age 8
  • 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
  • ≤ 43 kg 1 competition event

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
Does not count
Kids NoGi / Grey / Kids 10-11 years / -40kg
  • Registered weight class: -40kg
  • Source competition limit: -40kg

No matches in the rating period · no valid weight evidence

GrappleCity: Rotterdam Summer 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

2026 AGF Netherlands Championships
Does not count
Competition T-shirt / Youth Large

No matches in the rating period · no valid weight evidence

2026 AGF Netherlands Championships
≤ 43 kg · Counts as a competition event
Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • Registered weight class: Light I (Up to 43.10 kg)
  • Source competition limit: Light I (Up to 43.10 kg)

2 matches in the rating period

2026 AGF Netherlands Championships
≤ 43 kg · Counts as a competition event
No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • Registered weight class: Light I (Up to 43.10 kg)
  • Source competition limit: Light I (Up to 43.10 kg)

2 matches in the rating period

The Future League 9 - Gi & NoGi
Does not count
Gi - 40

3 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

Lion Cub Jiu Jitsu Competition 5
≤ 34 kg · Does not count
Boys NO-GI / 8 & 9 years old (DAY 2: Sunday) / Grey & Yellow belt / -34 & -38 kg
  • Registered weight class: -34 kg
  • Source competition limit: -34 kg

2 matches in the rating period · conflicting upper weight limits make this event ambiguous

Lion Cub Jiu Jitsu Competition 5
≤ 38 kg · Does not count
Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
  • Registered weight class: -38 kg
  • Source competition limit: -38 kg

4 matches in the rating period · conflicting upper weight limits make this event ambiguous

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 8 matches in the rating period Selected outcome
  • white 4 matches in the rating period
  • yellow 2 matches in the rating period

Registrations and outcomes

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

2 matches in the rating period

2026 AGF Netherlands Championships
grey · Counts as a match
No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • Source belt category: grey

2 matches in the rating period

2026 AGF Netherlands Championships
grey · Counts as a match
Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Light I (Up to 43.10 kg)
  • 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

Lion Cub Jiu Jitsu Competition 5
yellow · Counts as a match
Boys NO-GI / 8 & 9 years old (DAY 2: Sunday) / Grey & Yellow belt / -34 & -38 kg
  • Source belt category: yellow

2 matches in the rating period

Lion Cub Jiu Jitsu Competition 5
white · Counts as a match
Boys GI / 8 & 9 years old (DAY 2: Sunday) / White & Grey & Yellow belt / -38 kg
  • Source belt category: white

4 matches in the rating period