Sybe Boomsma - Rating | TopBJJ Index

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 1,229

Rating-period composition

Rating matches: 8 0
Record: 3–5 Previous month 3–5
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.

July 2026 No new matches Change 0 Rating 1,229

Rating-period composition

Rating matches: 8 0
Record: 3–5 Previous month 3–5
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.

June 2026 No new matches Change -4 Rating 1,229

Rating-period composition

Rating matches: 8 0
Record: 3–5 Previous month 3–5
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.

May 2026 2 new matches Change -35 Rating 1,233

Rating-period composition

Rating matches: 8 +2
Record: 3–5 Previous month 3–3
Opponents: 7 +2
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

May 30, 2026 Rayan Lichtveld

Nijmegen Open BJJ 2026 Kids / 13 - 15 years boys / White / -42 & -46 kg

Method Points 04:00 0–2

Marginal influence -30

Loss

May 30, 2026 Neo Rosenstand

Nijmegen Open BJJ 2026 Kids / 13 - 15 years boys / White / -42 & -46 kg

Method Points 04:00 2–4

Marginal influence -24

April 2026 No new matches Change 0 Rating 1,268

Rating-period composition

Rating matches: 6 0
Record: 3–3 Previous month 3–3
Opponents: 5 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 6 new matches Change Starting point Rating 1,268

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 28, 2026 Ilajah Swaak

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids GI / 10 - 12 years boys / White / -42 & -46 kg

Method Submission 02:24 0–9

Marginal influence -20

Win

March 28, 2026 Nouh El Badey

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids GI / 10 - 12 years boys / White / -42 & -46 kg

Method Submission 02:18 6–0

Marginal influence +20

Win

March 28, 2026 Zahra Hiba

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids GI / 10 - 12 years boys / White / -42 & -46 kg

Method Points 03:00 4–0

Marginal influence +30

Win

March 28, 2026 Loris De Ceulaer

International Veluwe Open Jiu Jitsu Championship 2026 GI & NO-GI Kids GI / 10 - 12 years boys / White / -42 & -46 kg

Method Points 03:00 2–2

Marginal influence +35

Loss

March 15, 2026 Jenoah Plet

Cauliflower Cup Circuit Boys Gi / White / Teen I (13yrs) / -44,50 kg

Method Submission 02:10 0–2

Marginal influence -16

Loss

March 15, 2026 Jenoah Plet

Cauliflower Cup Circuit Boys Gi / White / Teen I (13yrs) / -44,50 kg

Method Submission 01:33 0–0

Marginal influence -16

Relevant matches: 5.7

Official ranking percentile: Top 81%

Performance: 3.9 pp below expectation

5.7 weighted matches against 7 different opponents across 3 events

Weighted win rate: 37.2%
Expected win rate: 41.1%
Average opponent rating: 1,278
Repeated-opponent share: 12.5%
Network connectivity: 80.9%