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Samuel Harmsen

Grappling-Division

W–L
4–3
Won and lost rating-eligible matches in the past 12 months.
Gi
1,126
Rating based on Gi matches in the past 12 months.
No-Gi
1,342
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
6
Unique opponents faced in rating-eligible matches in the past 12 months.

Scheduled

Tournament history

Events

8
Events
Date Event Result Format Division
All Stars BJJ Netherlands the Netherlands · Gi · white · ≤75 kg ; No-Gi · ≤80 kg 0–2 W–L: Win / Loss GiNo-Gi
  • Juvenile / Male / White / Juvenile / 75kg
  • Juvenilenogi / Male / Beginner / Juvenile / 80kg
GrappleCity: Rotterdam Winter Open the Netherlands · No-Gi · 14–15 yo · white · ≤75 kg 2–1 W–L: Win / Loss No-Gi
  • Teens NoGi / White / 14-15 years / -75kg / Boy
Lion Cub Jiu Jitsu Competition 5 the Netherlands · No-Gi · 12–15 yo · grey · ≤70/75 kg 2–0 W–L: Win / Loss No-Gi
  • Boys NO-GI / 12 - 15 years old (DAY 1: Saturday) / Grey belt / -70 & -75 kg
NAGA Amsterdam Grappling Championship the Netherlands · No-Gi · 14–15 yo · 65–69.9 kg 2–0 W–L: Win / Loss No-Gi
  • Teens No-Gi (Male) / Beginner / 65 - 69.9 / 14-15 years
Lion Cub Jiu Jitsu Competition 4 the Netherlands · No-Gi · 14–15 yo · yellow/orange · ≤60/65 kg 1–1 W–L: Win / Loss No-Gi
  • Boys NO-GI / 14 & 15 years old (DAY 1: Saturday) / Yellow & Orange belt / -60 & -65 kg
2024 Amsterdam Open the Netherlands · Gi · 14–15 yo · white · ≤61.2 kg 2–0 W–L: Win / Loss Gi
  • Gi Kids / Boys / Teen (14 - 15 yrs) / White / Middle II (Up to 61.20 kg)
Lion Cub Jiu Jitsu Competition 3 the Netherlands · Gi · white/grey · ≤60 kg 0–3 W–L: Win / Loss Gi
  • Place #6
NAGA Amsterdam Grappling Championship the Netherlands · No-Gi · 14–15 yo · 60–64.9 kg 0–2 W–L: Win / Loss No-Gi
  • Teens No-Gi (Male) / Novice / 60 - 64.9 / 14-15 years

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 · 2 left period Change -37 Rating 1,352

Rating-period composition

Rating matches
7 -2
Record
4–3 Previous month 6–3
Opponents
6 -2
Events
3 -1

2 older matches left the 12-month period: 2 won and 0 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 0 Rating 1,389

Rating-period composition

Rating matches
9 0
Record
6–3 Previous month 6–3
Opponents
8 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.

June 2026 2 new matches Change -21 Rating 1,389

Rating-period composition

Rating matches
9 +2
Record
6–3 Previous month 6–1
Opponents
8 +1
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
June 28, 2026 Joao Dieguez
All Stars BJJ Netherlands Juvenilenogi / Male / Beginner / Juvenile / 80kg
Method Points 05:00 0–8
Marginal influence -25
Loss
June 28, 2026 Joao Dieguez
All Stars BJJ Netherlands Juvenile / Male / White / Juvenile / 75kg
Method Submission 01:46 0–0
Marginal influence -28
May 2026 No new matches Change +8 Rating 1,410

Rating-period composition

Rating matches
7 0
Record
6–1 Previous month 6–1
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 · 2 left period Change -13 Rating 1,402

Rating-period composition

Rating matches
7 -2
Record
6–1 Previous month 7–2
Opponents
7 -2
Events
3 -1

2 older matches left the 12-month period: 1 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 +11 Rating 1,415

Rating-period composition

Rating matches
9 0
Record
7–2 Previous month 7–2
Opponents
9 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.

February 2026 No new matches Change +1 Rating 1,404

Rating-period composition

Rating matches
9 0
Record
7–2 Previous month 7–2
Opponents
9 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 Change +1 Rating 1,403

Rating-period composition

Rating matches
9 0
Record
7–2 Previous month 7–2
Opponents
9 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.

December 2025 No new matches Change 0 Rating 1,402

Rating-period composition

Rating matches
9 0
Record
7–2 Previous month 7–2
Opponents
9 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.

November 2025 3 new matches · 2 left period Change -9 Rating 1,402

Rating-period composition

Rating matches
9 +1
Record
7–2 Previous month 7–1
Opponents
9 +2
Events
4 0

2 older matches left the 12-month period: 2 won and 0 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.
Loss
November 9, 2025 Jona Yeboah
GrappleCity: Rotterdam Winter Open Teens NoGi / White / 14-15 years / -75kg / Boy
Method Points 04:00 0–9
Marginal influence -22
Win
November 9, 2025 Oumar José
GrappleCity: Rotterdam Winter Open Teens NoGi / White / 14-15 years / -75kg / Boy
Method Points 04:00 5–0
Marginal influence +21
Win
November 9, 2025 Vince Vlaspoel
GrappleCity: Rotterdam Winter Open Teens NoGi / White / 14-15 years / -75kg / Boy
Method Points 04:00 6–0
Marginal influence +20
October 2025 2 new matches · 3 left period Change +79 Rating 1,411

Rating-period composition

Rating matches
8 -1
Record
7–1 Previous month 5–4
Opponents
7 -1
Events
4 0

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.

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
October 25, 2025 Zedek Vroon
Lion Cub Jiu Jitsu Competition 5 Boys NO-GI / 12 - 15 years old (DAY 1: Saturday) / Grey belt / -70 & -75 kg
Method Points 04:00 5–0
Marginal influence +28
Win
October 25, 2025 Lex Van Drempt
Lion Cub Jiu Jitsu Competition 5 Boys NO-GI / 12 - 15 years old (DAY 1: Saturday) / Grey belt / -70 & -75 kg
Method Points 04:00 0–0
Marginal influence +27
September 2025 No new matches Change -1 Rating 1,332

Rating-period composition

Rating matches
9 0
Record
5–4 Previous month 5–4
Opponents
8 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.

Relevant matches
6
Official ranking percentile
-
Performance
2.4 pp above expectation

6 weighted matches against 6 different opponents across 3 events

Weighted win rate
56.0%
Expected win rate
53.6%
Average opponent rating
1,325
Repeated-opponent share
14.3%
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 6 event votes Selected outcome

Registrations and outcomes

All Stars BJJ Netherlands
U18 · Counts
Juvenile / Male / White / Juvenile / 75kg
  • Competition age 16
  • Registered age: u18
  • Source category: u18
Juvenilenogi / Male / Beginner / Juvenile / 80kg
  • Competition age 16
  • Registered age: u18
  • Source category: u18
GrappleCity: Luxembourg Spring Open
U18 · Counts
Teens Gi / White / 16-17 years / -80kg / Boy
  • Competition age 16
  • Registered age: u18
  • Source category: u18
Grappling Industries AMSTERDAM
U18 · Counts
No Gi Kids / 14 - 15 years (Male) / Advanced (Yellow/Orange) / -155 lbs
  • Competition age 16
  • Registered age: u16
  • Source category: u16
2026 AGF Dusseldorf Championships
U18 · Counts
No Gi Kids / Boys / Teen (14 - 15 yrs) / Orange / Heavy I (Up to 72.60 kg)
  • Competition age 16
  • Registered age: u16
  • Source category: u16
Grappling Industries BERLIN
U18 · Counts
No Gi Kids / Advanced (Yellow/Orange) / 14 - 15 years (Male) / -155 lbs
  • Competition age 16
  • Registered age: u16
  • Source category: u16
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
U18 · Counts
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -72 kg
  • Competition age 16
  • Registered age: u16
  • Source category: u16
GrappleCity: Rotterdam Winter Open
Does not count
Teens NoGi / White / 14-15 years / -75kg / Boy
  • Competition age 15
  • Registered age: u16
  • Source category: u16
Lion Cub Jiu Jitsu Competition 5
Does not count
Boys NO-GI / 12 - 15 years old (DAY 1: Saturday) / Grey belt / -70 & -75 kg
  • Competition age 15
  • Registered age: u16
  • Source category: u16

Classification evidence

Why ≤ 70 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

  • ≤ 70 kg 1 competition event Selected outcome
  • ≤ 75 kg 1 competition event

Registrations and outcomes

All Stars BJJ Netherlands
≤ 75 kg · Does not count
Juvenile / Male / White / Juvenile / 75kg
  • Registered weight class: 75kg
  • Source competition limit: 75kg

1 match in the rating period · conflicting upper weight limits make this event ambiguous

All Stars BJJ Netherlands
≤ 80 kg · Does not count
Juvenilenogi / Male / Beginner / Juvenile / 80kg
  • Registered weight class: 80kg
  • Source competition limit: 80kg

1 match in the rating period · conflicting upper weight limits make this event ambiguous

GrappleCity: Luxembourg Spring Open
Does not count
Teens Gi / White / 16-17 years / -80kg / Boy
  • Registered weight class: -80kg
  • Source competition limit: -80kg

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
Does not count
No Gi Kids / 14 - 15 years (Male) / Advanced (Yellow/Orange) / -155 lbs
  • Registered weight class: -155 lbs
  • Source competition limit: -155 lbs

No matches in the rating period · no valid weight evidence

2026 AGF Dusseldorf Championships
Does not count
No Gi Kids / Boys / Teen (14 - 15 yrs) / Orange / Heavy I (Up to 72.60 kg)
  • Registered weight class: Heavy I (Up to 72.60 kg)
  • Source competition limit: Heavy I (Up to 72.60 kg)

No matches in the rating period · no valid weight evidence

Grappling Industries BERLIN
Does not count
No Gi Kids / Advanced (Yellow/Orange) / 14 - 15 years (Male) / -155 lbs
  • Registered weight class: -155 lbs
  • Source competition limit: -155 lbs

No matches in the rating period · no valid weight evidence

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
Does not count
Boys No-Gi (under 16 y.o.) / Orange / 14-15 years / -72 kg
  • Registered weight class: -72 kg
  • Source competition limit: -72 kg

No matches in the rating period · no valid weight evidence

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

3 matches in the rating period

Lion Cub Jiu Jitsu Competition 5
≤ 70 kg · Counts as a competition event
Boys NO-GI / 12 - 15 years old (DAY 1: Saturday) / Grey belt / -70 & -75 kg
  • Registered weight class: -70 kg
  • Source competition limit: -70 kg

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

All Stars BJJ Netherlands
white · Counts as a match
Juvenile / Male / White / Juvenile / 75kg
  • Source belt category: white

1 match 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

3 matches in the rating period

Lion Cub Jiu Jitsu Competition 5
grey · Counts as a match
Boys NO-GI / 12 - 15 years old (DAY 1: Saturday) / Grey belt / -70 & -75 kg
  • Source belt category: grey

2 matches in the rating period