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Casper Ossewaarde

Team Bolinha

W–L
4–0
Won and lost rating-eligible matches in the past 12 months.
Gi
1,371
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
4–0
Results from the ten most recent rating-eligible matches.
Opponents
4
Unique opponents faced in rating-eligible matches in the past 12 months.

Tournament history

Events

4
Events
Date Event Result Format Division
Grappling Industries AMSTERDAM the Netherlands · Gi · 16–17 yo · white · ≤170 lb ; No-Gi · 16–17 yo · white · ≤170 lb 3–0 W–L: Win / Loss GiNo-Gi
  • Place #6
  • Gi Kids / 16 - 17 years (Male) / White / -170 lbs
GrappleCity: Rotterdam Spring Open the Netherlands · Gi · 16–17 yo · white · ≤75 kg ; No-Gi · 16–17 yo · white · ≤75 kg 3–0 W–L: Win / Loss GiNo-Gi
  • Teens Gi / White / 16-17 years / -75kg / Boy
  • Place #4
BJJ Dutch Open 2025 the Netherlands 0–0 W–L: Win / Loss Gi
  • Place #17
VERSUS Championship 32 Gi & NoGi the Netherlands 0–0 W–L: Win / Loss GiNo-Gi
  • Silver
  • 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 +5 Rating 1,371

Rating-period composition

Rating matches
4 0
Record
4–0 Previous month 4–0
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 1,366

Rating-period composition

Rating matches
4 0
Record
4–0 Previous month 4–0
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 +7 Rating 1,366

Rating-period composition

Rating matches
4 0
Record
4–0 Previous month 4–0
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 0 Rating 1,359

Rating-period composition

Rating matches
4 0
Record
4–0 Previous month 4–0
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 -7 Rating 1,359

Rating-period composition

Rating matches
4 0
Record
4–0 Previous month 4–0
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 2 new matches Change +72 Rating 1,366

Rating-period composition

Rating matches
4 +2
Record
4–0 Previous month 2–0
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.
Win
March 1, 2026 Leon Gauvrit
Grappling Industries AMSTERDAM Gi Kids / 16 - 17 years (Male) / White / -170 lbs
Method Submission 02:08 2–0
Marginal influence +19
Win
March 1, 2026 Zedek Vroon
Grappling Industries AMSTERDAM Gi Kids / 16 - 17 years (Male) / White / -170 lbs
Method Submission 03:14 6–0
Marginal influence +20
February 2026 2 new matches Change Starting point Rating 1,294

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
February 22, 2026 Joao Dieguez
GrappleCity: Rotterdam Spring Open Teens Gi / White / 16-17 years / -75kg / Boy
Method Submission 03:33 3–0
Marginal influence +38
Win
February 22, 2026 Dzhaner Feradov
GrappleCity: Rotterdam Spring Open Teens Gi / White / 16-17 years / -75kg / Boy
Method Decision 04:00 0–0
Marginal influence +22
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
1,247
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 3 event votes Selected outcome

Registrations and outcomes

Nijmegen Open BJJ 2026
Does not count
Male / White belts 6 + months experience / Adult / -82,3 kg (Middle)
  • Competition age 17
VERSUS Championship 35 - Adults Gi & NoGi
Does not count
Male No-Gi / Beginner / -76
  • Competition age 17
Male Gi / White (Beginner) / -76
  • Competition age 17
Grappling Industries AMSTERDAM
Does not count
No Gi Adult / Male / Beginner (White) / Adult / -170 lbs
  • Competition age 17
Gi Adult / Male / White / Adult / -170 lbs
  • Competition age 17
NAGA Brussels Grappling Championship
U18 · Counts
Teens No-Gi (Male) / Beginner / 75 - 79.9 / 16-17 years
  • Competition age 17
  • Registered age: u18
  • Source category: u18
International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
Does not count
Male GI / White belts 6+ months experience / Adult / -76 kg (Light) GROUP A
  • Competition age 17
Grappling Industries AMSTERDAM
U18 · Counts
No Gi Kids / 16 - 17 years (Male) / Beginner (White) / -170 lbs
  • Competition age 17
  • Registered age: u18
  • Source category: u18
Gi Kids / 16 - 17 years (Male) / White / -170 lbs
  • Competition age 17
  • Registered age: u18
  • Source category: u18
GrappleCity: Rotterdam Spring Open
U18 · Counts
Teens NoGi / White / 16-17 years / -75kg / Boy
  • Competition age 17
  • Registered age: u18
  • Source category: u18
Teens Gi / White / 16-17 years / -75kg / Boy
  • Competition age 17
  • Registered age: u18
  • Source category: u18
VERSUS Championship 33 - NoGi & Adults only
Does not count
Male No-Gi / Beginner / -76
  • Competition age 17
BJJ Dutch Open 2025
Does not count
Adult Male (16+ years) / White belt / -76 kg
  • Competition age 16
VERSUS Championship 32 Gi & NoGi
Does not count
Gi White (Novice) / -70B
  • Competition age 16
No-Gi Novice / -70C
  • Competition age 16

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
  • ≤ 77 kg 1 competition event

Registrations and outcomes

Nijmegen Open BJJ 2026
Does not count
Male / White belts 6 + months experience / Adult / -82,3 kg (Middle)
  • Registered weight class: -82,3 kg (Middle)
  • Source competition limit: -82,3 kg (Middle)

No matches in the rating period · no valid weight evidence

VERSUS Championship 35 - Adults Gi & NoGi
Does not count
Male No-Gi / Beginner / -76

No matches in the rating period · no valid weight evidence

VERSUS Championship 35 - Adults Gi & NoGi
Does not count
Male Gi / White (Beginner) / -76

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
Does not count
No Gi Adult / Male / Beginner (White) / Adult / -170 lbs
  • Registered weight class: -170 lbs
  • Source competition limit: -170 lbs

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
Does not count
Gi Adult / Male / White / Adult / -170 lbs
  • Registered weight class: -170 lbs
  • Source competition limit: -170 lbs

No matches in the rating period · no valid weight evidence

NAGA Brussels Grappling Championship
Does not count
Teens No-Gi (Male) / Beginner / 75 - 79.9 / 16-17 years
  • Registered weight class: 75 - 79.9
  • Source competition limit: 75 - 79.9

No matches in the rating period · no valid weight evidence

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI
Does not count
Male GI / White belts 6+ months experience / Adult / -76 kg (Light) GROUP A
  • Registered weight class: -76 kg (Light)
  • Source competition limit: -76 kg (Light)

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
Does not count
No Gi Kids / 16 - 17 years (Male) / Beginner (White) / -170 lbs
  • Registered weight class: -170 lbs
  • Source competition limit: -170 lbs

No matches in the rating period · no valid weight evidence

Grappling Industries AMSTERDAM
≤ 77 kg · Counts as a competition event
Gi Kids / 16 - 17 years (Male) / White / -170 lbs
  • Registered weight class: -170 lbs
  • Source competition limit: -170 lbs

2 matches in the rating period

GrappleCity: Rotterdam Spring Open
Does not count
Teens NoGi / White / 16-17 years / -75kg / Boy
  • Registered weight class: -75kg
  • Source competition limit: -75kg

No matches in the rating period · no valid weight evidence

GrappleCity: Rotterdam Spring Open
≤ 75 kg · Counts as a competition event
Teens Gi / White / 16-17 years / -75kg / Boy
  • Registered weight class: -75kg
  • Source competition limit: -75kg

2 matches in the rating period

VERSUS Championship 33 - NoGi & Adults only
Does not count
Male No-Gi / Beginner / -76

No matches in the rating period · no valid weight evidence

BJJ Dutch Open 2025
Does not count
Adult Male (16+ years) / White belt / -76 kg
  • Registered weight class: -76 kg
  • Source competition limit: -76 kg

No matches in the rating period · no valid weight evidence

VERSUS Championship 32 Gi & NoGi
Does not count
Gi White (Novice) / -70B

No matches in the rating period · no valid weight evidence

VERSUS Championship 32 Gi & NoGi
Does not count
No-Gi Novice / -70C

No matches in the rating period · no valid weight evidence

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

Grappling Industries AMSTERDAM
white · Counts as a match
Gi Kids / 16 - 17 years (Male) / White / -170 lbs
  • Source belt category: white

2 matches in the rating period

GrappleCity: Rotterdam Spring Open
white · Counts as a match
Teens Gi / White / 16-17 years / -75kg / Boy
  • Source belt category: white

2 matches in the rating period