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Roman De Waard

Haven BJJ

W–L
0–4
Won and lost rating-eligible matches in the past 12 months.
Gi
1,083
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
0–4
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

6
Indexed competition matches
Date Opponent Result Event Division
2026-05-23 Dawud-Montassir Ahdid
Loss
GrappleCity: Rotterdam Summer Open Gi · Kids Gi / White / Kids 8-9 years / -30kg
2026-05-23 Omar Tahsin Haji Moustafa
Loss
GrappleCity: Rotterdam Summer Open Gi · Kids Gi / White / Kids 8-9 years / -30kg
2025-11-09 Naoufel Koudadi
Loss
GrappleCity: Rotterdam Winter Open Gi · Kids Gi / White / Kids 8-9 years / -30kg
2025-11-09 Kean Domagas
Loss
GrappleCity: Rotterdam Winter Open Gi · Kids Gi / White / Kids 8-9 years / -30kg
2025-04-19 River Richards
Loss
Lion Cub Jiu Jitsu Competition 4 Gi · Boys GI / 7 years old (DAY 2: Sunday) / White & Grey belt / -21 & -24 kg
2025-04-19 Abdullaah Saddiki
Loss
Lion Cub Jiu Jitsu Competition 4 Gi · Boys GI / 7 years old (DAY 2: Sunday) / White & Grey belt / -21 & -24 kg

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 1,083

Rating-period composition

Rating matches
4 0
Record
0–4 Previous month 0–4
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 1,083

Rating-period composition

Rating matches
4 0
Record
0–4 Previous month 0–4
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 0 Rating 1,083

Rating-period composition

Rating matches
4 0
Record
0–4 Previous month 0–4
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 2 new matches Change -32 Rating 1,083

Rating-period composition

Rating matches
4 +2
Record
0–4 Previous month 0–2
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
GrappleCity: Rotterdam Summer Open Kids Gi / White / Kids 8-9 years / -30kg
Method Submission 00:45 0–2
Marginal influence -32
Loss
GrappleCity: Rotterdam Summer Open Kids Gi / White / Kids 8-9 years / -30kg
Method Points 03:00 0–3
Marginal influence -24
April 2026 No new matches · 2 left period Change +37 Rating 1,115

Rating-period composition

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

2 older matches left the 12-month period: 0 won and 2 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 -1 Rating 1,078

Rating-period composition

Rating matches
4 0
Record
0–4 Previous month 0–4
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 No new matches Change +2 Rating 1,079

Rating-period composition

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

January 2026 No new matches Change +1 Rating 1,077

Rating-period composition

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

December 2025 No new matches Change 0 Rating 1,076

Rating-period composition

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

November 2025 2 new matches Change -34 Rating 1,076

Rating-period composition

Rating matches
4 +2
Record
0–4 Previous month 0–2
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
November 9, 2025 Naoufel Koudadi
GrappleCity: Rotterdam Winter Open Kids Gi / White / Kids 8-9 years / -30kg
Method Submission 01:46 2–11
Marginal influence -26
Loss
November 9, 2025 Kean Domagas
GrappleCity: Rotterdam Winter Open Kids Gi / White / Kids 8-9 years / -30kg
Method Submission 02:25 0–10
Marginal influence -17
October 2025 No new matches Change -2 Rating 1,110

Rating-period composition

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

September 2025 No new matches Change +3 Rating 1,112

Rating-period composition

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

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
1,303
Repeated-opponent share
0.0%
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 1 event vote Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
U10 · Counts
Kids Gi / White / Kids 8-9 years / -30kg
  • Competition age 9
  • Registered age: u10
  • Source category: u10
GrappleCity: Rotterdam Winter Open
Does not count
Kids Gi / White / Kids 8-9 years / -30kg
  • Competition age 8
  • Registered age: u10
  • Source category: u10

Classification evidence

Why ≤ 30 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

  • ≤ 30 kg 2 competition events Selected outcome

Registrations and outcomes

GrappleCity: Rotterdam Summer Open
≤ 30 kg · Counts as a competition event
Kids Gi / White / Kids 8-9 years / -30kg
  • Registered weight class: -30kg
  • Source competition limit: -30kg

2 matches in the rating period

GrappleCity: Rotterdam Winter Open
≤ 30 kg · Counts as a competition event
Kids Gi / White / Kids 8-9 years / -30kg
  • Registered weight class: -30kg
  • Source competition limit: -30kg

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 Summer Open
white · Counts as a match
Kids Gi / White / Kids 8-9 years / -30kg
  • Source belt category: white

2 matches in the rating period

GrappleCity: Rotterdam Winter Open
white · Counts as a match
Kids Gi / White / Kids 8-9 years / -30kg
  • Source belt category: white

2 matches in the rating period