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David Happersberger

Martial Arts Sports Center

W–L
8–6
Won and lost rating-eligible matches in the past 12 months.
Gi
1,338
Rating based on Gi matches in the past 12 months.
No-Gi
1,265
Rating based on No-Gi matches in the past 12 months.
Current form
6–4
Results from the ten most recent rating-eligible matches.
Opponents
7
Unique opponents faced in rating-eligible matches in the past 12 months.

Tournament history

Events

4
Events
Date Event Result Format Division
Dragon cup Germany · Gi · 8–9 yo · white · ≤40 kg ; No-Gi · 8–9 yo · ≤40 kg 3–2 W–L: Win / Loss GiNo-Gi
  • Children No-Gi (8-9 Jahre) / Intermediate / -40kg / 8-9 Jahre / Male
  • Children Gi (8-9 Jahre) / weiß / -40kg / 8-9Jahre / Male
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Germany · Gi · U16 · white · ≤42 kg ; No-Gi · U16 · white · ≤42 kg 3–3 W–L: Win / Loss GiNo-Gi
  • Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Boys No-Gi (under 16 y.o.) / White / 8-9 years / -42 kg
NAGA Europe Grappling Championship Germany · Gi · 8–9 yo · 35–39.9 kg ; No-Gi · 8–9 yo · 35–39.9 kg 2–2 W–L: Win / Loss GiNo-Gi
  • Children No-Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
  • Children Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
Bulldog BJJ Tournament Germany · Gi · 9 yo · white · 30–34.9 kg ; No-Gi · ≤35 kg 4–0 W–L: Win / Loss GiNo-Gi
  • Kids Mixed Gi / White / Pee Wee III (9yrs) / 30,0 kg -34,9 kg
  • Kids Mixed No-Gi / Beginner / -35 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 -2 Rating 1,376

Rating-period composition

Rating matches
14 0
Record
8–6 Previous month 8–6
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 +3 Rating 1,378

Rating-period composition

Rating matches
14 0
Record
8–6 Previous month 8–6
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 5 new matches · 4 left period Change -42 Rating 1,375

Rating-period composition

Rating matches
14 +1
Record
8–6 Previous month 9–4
Opponents
7 -1
Events
3 0

4 older matches left the 12-month period: 4 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.
Win
June 14, 2026 Matteo Brosch
Dragon cup Children Gi (8-9 Jahre) / weiß / -40kg / 8-9Jahre / Male
Method Submission 01:58 8–0
Marginal influence +10
Win
June 14, 2026 Matteo Brosch
Dragon cup Children Gi (8-9 Jahre) / weiß / -40kg / 8-9Jahre / Male
Method Submission 00:50 9–0
Marginal influence +10
Loss
June 14, 2026 Kiril Delos Santos
Dragon cup Children No-Gi (8-9 Jahre) / Intermediate / -40kg / 8-9 Jahre / Male
Method Points 03:00 0–9
Marginal influence -8
Win
June 14, 2026 Kiril Delos Santos
Dragon cup Children No-Gi (8-9 Jahre) / Intermediate / -40kg / 8-9 Jahre / Male
Method Points 03:00 6–2
Marginal influence +11
Loss
June 14, 2026 Kiril Delos Santos
Dragon cup Children No-Gi (8-9 Jahre) / Intermediate / -40kg / 8-9 Jahre / Male
Method Points 03:00 0–12
Marginal influence -8
May 2026 No new matches Change +2 Rating 1,417

Rating-period composition

Rating matches
13 0
Record
9–4 Previous month 9–4
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.

April 2026 5 new matches Change +13 Rating 1,415

Rating-period composition

Rating matches
13 +5
Record
9–4 Previous month 6–2
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
April 18, 2026 Noah Abdul
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / White / 8-9 years / -42 kg
Method Submission 01:42 4–6
Marginal influence -18
Win
April 18, 2026 Sami Ouahmar
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / White / 8-9 years / -42 kg
Method Points 03:00 13–0
Marginal influence +10
Win
April 18, 2026 Sami Ouahmar
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
Method Submission 00:56 4–0
Marginal influence +11
Win
April 18, 2026 Masri Hamdo
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
Method Submission 00:56 6–2
Marginal influence +14
Loss
April 18, 2026 Noah Abdul
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
Method Points 03:00 6–10
Marginal influence -14
March 2026 No new matches Change +3 Rating 1,402

Rating-period composition

Rating matches
8 0
Record
6–2 Previous month 6–2
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.

February 2026 No new matches Change -7 Rating 1,399

Rating-period composition

Rating matches
8 0
Record
6–2 Previous month 6–2
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.

January 2026 No new matches Change 0 Rating 1,406

Rating-period composition

Rating matches
8 0
Record
6–2 Previous month 6–2
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.

December 2025 No new matches Change +2 Rating 1,406

Rating-period composition

Rating matches
8 0
Record
6–2 Previous month 6–2
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.

November 2025 No new matches Change +7 Rating 1,404

Rating-period composition

Rating matches
8 0
Record
6–2 Previous month 6–2
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.

October 2025 4 new matches Change +20 Rating 1,397

Rating-period composition

Rating matches
8 +4
Record
6–2 Previous month 4–0
Opponents
5 +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
October 4, 2025 Bruno Preißl
NAGA Europe Grappling Championship Children No-Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
Method Points 03:00 8–2
Marginal influence +7
Loss
October 4, 2025 Jean Riabzev
NAGA Europe Grappling Championship Children No-Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
Method Submission 02:24 0–9
Marginal influence -9
Win
October 4, 2025 Bruno Preißl
NAGA Europe Grappling Championship Children Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
Method Submission 03:00 11–0
Marginal influence +12
Loss
October 4, 2025 Jean Riabzev
NAGA Europe Grappling Championship Children Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
Method Submission 01:01 0–0
Marginal influence -5
September 2025 No new matches Change 0 Rating 1,377

Rating-period composition

Rating matches
4 0
Record
4–0 Previous month 4–0
Opponents
3 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
9.8
Official ranking percentile
Top 35%
Performance
9.4 pp above expectation

9.8 weighted matches against 7 different opponents across 3 events

Weighted win rate
57.8%
Expected win rate
48.4%
Average opponent rating
1,370
Repeated-opponent share
50.0%
Network connectivity
87.6%

Classification evidence

Why U12?

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

  • U12 2 event votes Selected outcome

Registrations and outcomes

Dragon cup
U12 · Counts
Children Gi (8-9 Jahre) / weiß / -40kg / 8-9Jahre / Male
  • Competition age 10
  • Registered age: u10
  • Source category: u10
Children No-Gi (8-9 Jahre) / Intermediate / -40kg / 8-9 Jahre / Male
  • Competition age 10
  • Registered age: u10
  • Source category: u10
FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
U12 · Counts
Boys No-Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Competition age 10
  • Registered age: u10
  • Source category: u10
Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Competition age 10
  • Registered age: u10
  • Source category: u10
NAGA Europe Grappling Championship
Does not count
Children Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
  • Competition age 9
  • Registered age: u10
  • Source category: u10
Children No-Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
  • Competition age 9
  • Registered age: u10
  • Source category: u10

Classification evidence

Why ≤ 40 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

  • ≤ 40 kg 2 competition events Selected outcome
  • ≤ 42 kg 1 competition event

Registrations and outcomes

Dragon cup
≤ 40 kg · Counts as a competition event
Children Gi (8-9 Jahre) / weiß / -40kg / 8-9Jahre / Male
  • Registered weight class: -40kg
  • Source competition limit: -40kg

2 matches in the rating period

Dragon cup
≤ 40 kg · Counts as a competition event
Children No-Gi (8-9 Jahre) / Intermediate / -40kg / 8-9 Jahre / Male
  • Registered weight class: -40kg
  • Source competition limit: -40kg

3 matches in the rating period

FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
≤ 42 kg · Counts as a competition event
Boys No-Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Registered weight class: -42 kg
  • Source competition limit: -42 kg

2 matches in the rating period

FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
≤ 42 kg · Counts as a competition event
Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Registered weight class: -42 kg
  • Source competition limit: -42 kg

3 matches in the rating period

NAGA Europe Grappling Championship
≤ 40 kg · Counts as a competition event
Children Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
  • Registered weight class: 35 - 39.9
  • Source competition limit: 35 - 39.9

2 matches in the rating period

NAGA Europe Grappling Championship
≤ 40 kg · Counts as a competition event
Children No-Gi (Male) / Beginner / 35 - 39.9 / 8-9 years
  • Registered weight class: 35 - 39.9
  • Source competition limit: 35 - 39.9

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 5 matches in the rating period Selected outcome

Registrations and outcomes

FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
white · Counts as a match
Boys No-Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Source belt category: white

2 matches in the rating period

FRANKFURT SPRING OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
white · Counts as a match
Boys Gi (under 16 y.o.) / White / 8-9 years / -42 kg
  • Source belt category: white

3 matches in the rating period