TopBJJ Index Youth

TopBJJ Index

Search TopBJJ Index
Language selector
Menu
CZ

David Rosenbaum

Tiger gym

W–L
2–5
Won and lost rating-eligible matches in the past 12 months.
Gi
1,192
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
2–5
Results from the ten most recent rating-eligible matches.
Opponents
7
Unique opponents faced in rating-eligible matches in the past 12 months.

Indexed career

Matches

15
Indexed competition matches
Date Opponent Result Event Division
2026-03-21 Marcus ŠOUN
Loss
TATAMY 20: PRAGUE - KIDS (round robin) Gi · Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
2026-03-21 Damian Trnka
Loss
TATAMY 20: PRAGUE - KIDS (round robin) Gi · Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
2026-03-21 Lukas Čupak
Loss
TATAMY 20: PRAGUE - KIDS (round robin) Gi · Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
2025-11-01 David Sekanina
Win
TATAMY 17 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-11-01 Tomas Rezac
Loss
TATAMY 17 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-11-01 Erik Auramioti
Loss
TATAMY 17 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-11-01 Michael Nováček
Win
TATAMY 17 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-05-10 Milan Novotný
Loss
TATAMY 15 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-05-10 Tomas Rezac
Loss
TATAMY 15 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-05-10 Michael Nováček
Win
TATAMY 15 KIDS (No-GI and GI round robin) Gi · Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
2025-03-08 Michael Nováček
Win
2025 AGF Prague Jiu Jitsu Championships Gi · Gi Kids / Boys / Pre Teen (10 - 11 yrs) / White / Heavy II (Up to 999.00 kg)
2025-03-08 Michael Nováček
Win
2025 AGF Prague Jiu Jitsu Championships Gi · Gi Kids / Boys / Pre Teen (10 - 11 yrs) / White / Heavy II (Up to 999.00 kg)
2025-01-25 Adam Syrovátka
Loss
Pardubice Grappling Open vol.3 Gi · Boys Junior GI / 13-14 years / -75 kg / Beginner
2025-01-25 Jan Plechatý
Win
Pardubice Grappling Open vol.3 Gi · Boys Junior GI / 13-14 years / -75 kg / Beginner
2024-10-12 Tomas Rezac
Loss
SAMURAI CUP 2024 - CFS 8 Gi · Grappling Gi / Starší žáci U14 10-13 let / -65 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 -1 Rating 1,192

Rating-period composition

Rating matches
7 0
Record
2–5 Previous month 2–5
Opponents
7 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 1,193

Rating-period composition

Rating matches
7 0
Record
2–5 Previous month 2–5
Opponents
7 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 +1 Rating 1,193

Rating-period composition

Rating matches
7 0
Record
2–5 Previous month 2–5
Opponents
7 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 · 3 left period Change -5 Rating 1,192

Rating-period composition

Rating matches
7 -3
Record
2–5 Previous month 3–7
Opponents
7 -1
Events
2 -1

3 older matches left the 12-month period: 1 won and 2 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

April 2026 No new matches Change +3 Rating 1,197

Rating-period composition

Rating matches
10 0
Record
3–7 Previous month 3–7
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.

March 2026 3 new matches · 2 left period Change -83 Rating 1,194

Rating-period composition

Rating matches
10 +1
Record
3–7 Previous month 5–4
Opponents
8 +3
Events
3 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
March 21, 2026 Marcus ŠOUN
TATAMY 20: PRAGUE - KIDS (round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
Method Points 04:00 3–7
Marginal influence -24
Loss
March 21, 2026 Damian Trnka
TATAMY 20: PRAGUE - KIDS (round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
Method Submission 01:46 0–0
Marginal influence -32
Loss
March 21, 2026 Lukas Čupak
TATAMY 20: PRAGUE - KIDS (round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
Method Submission 00:47 0–6
Marginal influence -20
February 2026 No new matches Change +9 Rating 1,277

Rating-period composition

Rating matches
9 0
Record
5–4 Previous month 5–4
Opponents
5 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 · 1 left period Change +22 Rating 1,268

Rating-period composition

Rating matches
9 -1
Record
5–4 Previous month 5–5
Opponents
5 -1
Events
3 -1

1 older matches left the 12-month period: 0 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

December 2025 No new matches Change -4 Rating 1,246

Rating-period composition

Rating matches
10 0
Record
5–5 Previous month 5–5
Opponents
6 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 4 new matches Change +30 Rating 1,250

Rating-period composition

Rating matches
10 +4
Record
5–5 Previous month 3–3
Opponents
6 +2
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.
Win
November 1, 2025 David Sekanina
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
Method Points 04:00 0–-1
Marginal influence +35
Loss
November 1, 2025 Tomas Rezac
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
Method Submission 01:10 0–0
Marginal influence -14
Loss
November 1, 2025 Erik Auramioti
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
Method Submission 00:58 0–0
Marginal influence -18
Win
November 1, 2025 Michael Nováček
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
Method Decision 04:00 0–0
Marginal influence +37
October 2025 No new matches · 1 left period Change +17 Rating 1,220

Rating-period composition

Rating matches
6 -1
Record
3–3 Previous month 3–4
Opponents
4 0
Events
3 -1

1 older matches left the 12-month period: 0 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

September 2025 No new matches Change +4 Rating 1,203

Rating-period composition

Rating matches
7 0
Record
3–4 Previous month 3–4
Opponents
4 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
5.1
Official ranking percentile
Top 88%
Performance
-

5.1 weighted matches against 7 different opponents across 2 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,310
Repeated-opponent share
0.0%
Network connectivity
80.9%

Classification evidence

Why U14?

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

  • U14 1 event vote Selected outcome

Registrations and outcomes

TATAMY 20: PRAGUE - KIDS (round robin)
U14 · Counts
Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
  • Competition age 13
TATAMY 17 KIDS (No-GI and GI round robin)
Does not count
Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
  • Competition age 12

Classification evidence

Why Grey?

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

  • grey 7 matches in the rating period Selected outcome

Registrations and outcomes

TATAMY 20: PRAGUE - KIDS (round robin)
grey · Counts as a match
Kids / Gi / 13-14 years / Boys / White/grey belt / +65 kg
  • Source belt category: grey

3 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 10-12 years / Boys / White/grey belt / +60 kg
  • Source belt category: grey

4 matches in the rating period