TopBJJ Index Youth

TopBJJ Index

Search TopBJJ Index
Language selector
Menu
NL

Sem Van Der Bom

Renzo Gracie Oudenbosch

W–L
3–5
Won and lost rating-eligible matches in the past 12 months.
Gi
1,228
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
3–5
Results from the ten most recent rating-eligible matches.
Opponents
7
Unique opponents faced in rating-eligible matches in the past 12 months.

Honours

Medals and placements

Gold
0
Silver
4
Bronze
2
Total medals
6
Events with results
8

Full career record

Wins
10
Losses
13
Matches
23
Win rate
43.5%

Ways of winning

Submission
5
Points
3
Decision
0
Disqualification
0

Personal records

Longest winning streak
2
Longest submission streak
1

Recent recorded placements

12-month performance profile

How the results were achieved

Past 12 months
Current win streak
0
Unique opponents
7
Distinct events
3

Ways of winning

  • Submission 2 67%
  • Points 1 33%
  • Decision 0 0%
  • Other recorded result 0 0%

Gi versus No-Gi

Gi

Rating
1228
Record
3–5
Win rate
38%
Submission share
67%

No-Gi

Rating
-
Record
-
Win rate
-
Submission share
-

Win quality

Grouped by pre-match win probability. This provides context and does not award an extra rating bonus.

As underdog 0–0 Less than 35% expected win probability before the match.
Even match 0–0 Between 35% and 65% expected win probability before the match.
As favourite 0–0 More than 65% expected win probability before the match.

Development

Rating and development

The same published rating, supported by trend, opponent strength and evidence quality.

Current rating
1,228
Change over 90 days
-23
Highest rating in 12 months
1,251
Performance versus expectation
-3.3 pp
Schedule strength
Top 61%
Average opponent rating
1,304
Weighted win rate
39%
Expected win rate
43%
Repeat-opponent share
13%
Effective evidence
5.7
Confidence
74/100

Opponents

Opposition and rivalries

The strongest recorded win, rematches and opponents faced repeatedly.

Rematches 2–4 2–4 across 6 rematches against 3 repeat opponents.

Top 10 highest-ranked defeated opponents

Past 12 months

  1. #1215 Everthon Souza Rodrigues · Lion Cub Jiu Jitsu Competition 6 Sub 03:30 2–4
  2. #1444 Arminas Tumasonis · The Future League 8 – Gi & No-Gi Pts 5–2

Full career

  1. #1215 Everthon Souza Rodrigues · Lion Cub Jiu Jitsu Competition 6 Sub 03:30 2–4
  2. #1444 Arminas Tumasonis · The Future League 8 – Gi & No-Gi Pts 5–2

Rivals

Opponent Head-to-head record Matches
Bheem Chaitoe 0–2 2
Kenan Tuglaci 0–2 2
Kris Konings 2–0 2

Around this athlete

Athlete Rank Rating
Nahil Bouchehitt #1199 1,229
Sem Van Der Bom #1200 1,228
Timea Simion #1201 1,228

Recent tournaments

  2. The Future League 8 – Gi & No-Gi

    November 30, 2025 · Gi · ≤38 kg
    Gi 2–2

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 1,228

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 1,228

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 0 Rating 1,228

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 +28 Rating 1,228

Rating-period composition

Rating matches
8 +2
Record
3–5 Previous month 2–4
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 9, 2026 Loek Smulders
Lion Cub Jiu Jitsu Competition 6 Boys GI / 13 & 14 years old (DAY 1: Saturday) / Grey & Yellow belt / -75 kg
Method Points 04:00 4–4
Marginal influence -20
Win
Lion Cub Jiu Jitsu Competition 6 Boys GI / 13 & 14 years old (DAY 1: Saturday) / Grey & Yellow belt / -75 kg
Method Submission 03:30 2–4
Marginal influence +29
April 2026 No new matches · 3 left period Change -42 Rating 1,200

Rating-period composition

Rating matches
6 -3
Record
2–4 Previous month 4–5
Opponents
5 -3
Events
2 -1

3 older matches left the 12-month period: 2 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 -4 Rating 1,242

Rating-period composition

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

February 2026 No new matches Change +3 Rating 1,246

Rating-period composition

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

January 2026 No new matches Change -8 Rating 1,243

Rating-period composition

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

December 2025 No new matches Change 0 Rating 1,251

Rating-period composition

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

November 2025 4 new matches Change +64 Rating 1,251

Rating-period composition

Rating matches
9 +4
Record
4–5 Previous month 2–3
Opponents
8 +3
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
November 30, 2025 Kenan Tuglaci
The Future League 8 – Gi & No-Gi Gi-38
Method Submission 01:41 0–14
Marginal influence -7
Win
November 30, 2025 Arminas Tumasonis
The Future League 8 – Gi & No-Gi Gi-38
Method Points 5–2
Marginal influence +22
Loss
November 30, 2025 Belal Sultan
The Future League 8 – Gi & No-Gi Gi-38
Method Points 2–7
Marginal influence -27
Win
November 30, 2025 Burhan Karaaslan
The Future League 8 – Gi & No-Gi Gi-38
Method Submission 02:10 6–0
Marginal influence +21
October 2025 2 new matches · 2 left period Change -36 Rating 1,187

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 3–2
Opponents
5 +1
Events
2 0

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.

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 Kenan Tuglaci
Lion Cub Jiu Jitsu Competition 5 Boys GI / 13 - 15 years old (DAY 1: Saturday) / Grey & Yellow belt / -70 & -75 kg
Method Submission 01:36 0–9
Marginal influence -9
Loss
October 25, 2025 Lex Van Drempt
Lion Cub Jiu Jitsu Competition 5 Boys GI / 13 - 15 years old (DAY 1: Saturday) / Grey & Yellow belt / -70 & -75 kg
Method Points 04:00 0–10
Marginal influence -27
September 2025 No new matches · 2 left period Change +22 Rating 1,223

Rating-period composition

Rating matches
5 -2
Record
3–2 Previous month 3–4
Opponents
4 -2
Events
2 -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.

Relevant matches
5.7
Official ranking percentile
Top 81%
Performance
3.3 pp below expectation

5.7 weighted matches against 7 different opponents across 3 events

Weighted win rate
39.3%
Expected win rate
42.6%
Average opponent rating
1,304
Repeated-opponent share
12.5%
Network connectivity
87.6%

Classification evidence

Why U16?

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

  • U16 1 event vote Selected outcome

Registrations and outcomes

Lion Cub Jiu Jitsu Competition 6
U16 · Counts
Boys GI / 13 & 14 years old (DAY 1: Saturday) / Grey & Yellow belt / -75 kg
  • Competition age 14
  • Registered age: u14
  • Source category: u14
The Future League 8 – Gi & No-Gi
Does not count
Gi-38
  • Competition age 13
  • Registered age: u16
  • Source category: u16
Lion Cub Jiu Jitsu Competition 5
Does not count
Boys GI / 13 - 15 years old (DAY 1: Saturday) / Grey & Yellow belt / -70 & -75 kg
  • Competition age 13
  • Registered age: u16
  • Source category: u16

Classification evidence

Why ≤ 65 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

  • ≤ 65 kg 1 competition event Selected outcome
  • ≤ 75 kg 1 competition event

Registrations and outcomes

Lion Cub Jiu Jitsu Competition 6
≤ 75 kg · Counts as a competition event
Boys GI / 13 & 14 years old (DAY 1: Saturday) / Grey & Yellow belt / -75 kg
  • Registered weight class: -75 kg
  • Source competition limit: -75 kg

2 matches in the rating period

The Future League 8 – Gi & No-Gi
Does not count
Gi-38

4 matches in the rating period · weight class could not be normalized reliably

Lion Cub Jiu Jitsu Competition 5
≤ 65 kg · Counts as a competition event
Boys GI / 13 - 15 years old (DAY 1: Saturday) / Grey & Yellow belt / -70 & -75 kg
  • Registered weight class: -65 kg
  • Source competition limit: -65 kg

2 matches in the rating period

Classification evidence

Why Yellow?

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

  • yellow 4 matches in the rating period Selected outcome

Registrations and outcomes

Lion Cub Jiu Jitsu Competition 6
yellow · Counts as a match
Boys GI / 13 & 14 years old (DAY 1: Saturday) / Grey & Yellow belt / -75 kg
  • Source belt category: yellow

2 matches in the rating period

Lion Cub Jiu Jitsu Competition 5
yellow · Counts as a match
Boys GI / 13 - 15 years old (DAY 1: Saturday) / Grey & Yellow belt / -70 & -75 kg
  • Source belt category: yellow

2 matches in the rating period