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DE

Gustav Achtenberg

Fennec Jiu Jitsu

W–L
0–4
Won and lost rating-eligible matches in the past 12 months.
Gi
1,116
Rating based on Gi matches in the past 12 months.
No-Gi
1,125
Rating based on No-Gi matches in the past 12 months.
Current form
0–6
Results from the ten most recent rating-eligible matches.
Opponents
4
Unique opponents faced in rating-eligible matches in the past 12 months.

Honours

Medals and placements

Gold
1
Silver
5
Bronze
5
Total medals
11
Events with results
9

Full career record

Wins
14
Losses
21
Matches
35
Win rate
40.0%

Ways of winning

Submission
10
Points
2
Decision
1
Disqualification
0

Personal records

Longest winning streak
4
Longest submission streak
4

Recent recorded placements

  4. Fennec BJJ Kids Cup Vol. 6

    DE Event record 1–3

    • Boys NoGi / Junior II (11/12 yrs) / Yellow/Orange / -45.00 kg
    • Boys Gi / Junior II (11/12 yrs) / Yellow/Orange / Above 48,00 kg

  5. Fennec BJJ Kids Cup Vol.5

    DE Event record 0–4

    • Boys Gi / Junior II (11/12 yrs) / Yellow/Orange (bzw. 1 bis 3 Jahre Training) / -48,00 kg
    • Boys NoGi / Junior II (11/12 yrs) / Yellow/Orange (bzw. 1 bis 3 Jahre Training) / -45.00 kg

12-month performance profile

How the results were achieved

Past 12 months
Current win streak
0
Unique opponents
4
Distinct events
1

Ways of winning

  • Submission 0
  • Points 0
  • Decision 0
  • Other recorded result 0

Gi versus No-Gi

Gi

Rating
1116
Record
0–2
Win rate
0%
Submission share
-

No-Gi

Rating
1125
Record
0–2
Win rate
0%
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
1,211
Change over 90 days
-41
Highest rating in 12 months
1,318
Performance versus expectation
-
Schedule strength
-
Average opponent rating
1,428
Weighted win rate
-
Expected win rate
-
Repeat-opponent share
0%
Effective evidence
3.4
Confidence
59/100

Opponents

Opposition and rivalries

The strongest recorded win, rematches and opponents faced repeatedly.

Rematches 4–13 4–13 across 17 rematches against 6 repeat opponents.

Top 10 highest-ranked defeated opponents

Past 12 months

No win over a currently ranked opponent in this period.

Full career

  1. #1104 Sari Allam · Fennec BJJ Kids Cup Vol. 4 Pts 2–0
  2. #1275 Torge Huwald · Fennec BJJ KIDS CUP Vol. 7 Gi and NoGi Sub 01:19 0–0

Rivals

Opponent Head-to-head record Matches
Soma Sakai 0–3 3

Recent tournaments

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 1,211

Rating-period composition

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

July 2026 No new matches Change +1 Rating 1,211

Rating-period composition

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

June 2026 No new matches Change 0 Rating 1,210

Rating-period composition

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

May 2026 No new matches Change +4 Rating 1,210

Rating-period composition

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

April 2026 No new matches Change +2 Rating 1,206

Rating-period composition

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

March 2026 No new matches · 5 left period Change -71 Rating 1,204

Rating-period composition

Rating matches
4 -5
Record
0–4 Previous month 3–6
Opponents
4 -3
Events
1 -1

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

February 2026 No new matches Change 0 Rating 1,275

Rating-period composition

Rating matches
9 0
Record
3–6 Previous month 3–6
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.

January 2026 No new matches Change +2 Rating 1,275

Rating-period composition

Rating matches
9 0
Record
3–6 Previous month 3–6
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.

December 2025 No new matches Change -4 Rating 1,273

Rating-period composition

Rating matches
9 0
Record
3–6 Previous month 3–6
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.

November 2025 4 new matches · 4 left period Change -44 Rating 1,277

Rating-period composition

Rating matches
9 0
Record
3–6 Previous month 4–5
Opponents
7 0
Events
2 0

4 older matches left the 12-month period: 1 won and 3 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
November 22, 2025 Elias Benabdallah
Fennec BJJ Kids Cup Gi & NoGi Boys No-Gi (under 16 y.o.) / Orange / 12-13 years / -60 kg
Method Submission 01:34 0–5
Marginal influence -10
Loss
November 22, 2025 Ylber-Rubin Murtezi
Fennec BJJ Kids Cup Gi & NoGi Boys No-Gi (under 16 y.o.) / Orange / 12-13 years / -60 kg
Method Submission 00:36 0–2
Marginal influence -9
Loss
November 22, 2025 Joshua Maennel
Fennec BJJ Kids Cup Gi & NoGi Boys Gi (under 16 y.o.) / Orange / 12-13 years / -55 kg
Method Submission 03:03 0–7
Marginal influence -20
Loss
November 22, 2025 Khakim Umedov
Fennec BJJ Kids Cup Gi & NoGi Boys Gi (under 16 y.o.) / Orange / 12-13 years / -55 kg
Method Submission 01:41 0–4
Marginal influence -4
October 2025 No new matches Change +3 Rating 1,321

Rating-period composition

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

September 2025 No new matches Change 0 Rating 1,318

Rating-period composition

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

Relevant matches
3.4
Official ranking percentile
-
Performance
-

3.4 weighted matches against 4 different opponents across 1 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,428
Repeated-opponent share
0.0%
Network connectivity
87.6%

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

Fennec BJJ Kids Cup Gi & NoGi
U14 · Counts
Boys No-Gi (under 16 y.o.) / Orange / 12-13 years / -60 kg
  • Competition age 12
  • Registered age: u14
  • Source category: u14
Boys Gi (under 16 y.o.) / Orange / 12-13 years / -55 kg
  • Competition age 12
  • Registered age: u14
  • Source category: u14

Classification evidence

Why Orange?

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

  • orange 6 matches in the rating period Selected outcome

Registrations and outcomes

Grappling Industries BERLIN
orange · Counts as a match
Gi Kids / Yellow/Orange / 14 - 15 years (Male) / -145 lbs
  • Source belt category: orange

2 matches in the rating period

Fennec BJJ Kids Cup Gi & NoGi
orange · Counts as a match
Boys No-Gi (under 16 y.o.) / Orange / 12-13 years / -60 kg
  • Source belt category: orange

2 matches in the rating period

Fennec BJJ Kids Cup Gi & NoGi
orange · Counts as a match
Boys Gi (under 16 y.o.) / Orange / 12-13 years / -55 kg
  • Source belt category: orange

2 matches in the rating period