TopBJJ Index Youth

TopBJJ Index

Search TopBJJ Index
Language selector
Menu
DE

Isabella Skierecki

VfL Westercelle

W–L
2–6
Won and lost rating-eligible matches in the past 12 months.
Gi
1,222
Rating based on Gi matches in the past 12 months.
No-Gi
1,122
Rating based on No-Gi matches in the past 12 months.
Current form
4–6
Results from the ten most recent rating-eligible matches.
Opponents
3
Unique opponents faced in rating-eligible matches in the past 12 months.

Honours

Medals and placements

Gold
2
Silver
4
Bronze
1
Total medals
7
Events with results
4

Full career record

Wins
8
Losses
10
Matches
18
Win rate
44.4%

Ways of winning

Submission
6
Points
0
Decision
0
Disqualification
1

Personal records

Longest winning streak
2
Longest submission streak
2

Recent recorded placements

  3. Flanders Open 2026

    BE Event record 3–2

    • Youth Ju-Jitsu Fighting FEMALE / U16 / -57 kg
    • Youth Jiu-Jitsu BJJ FEMALE / U16 Show Match

12-month performance profile

How the results were achieved

Past 12 months
Current win streak
0
Unique opponents
3
Distinct events
2

Ways of winning

  • Submission 6 86%
  • Points 0 0%
  • Decision 0 0%
  • Other recorded result 1 14%

Gi versus No-Gi

Gi

Rating
1222
Record
2–2
Win rate
50%
Submission share
86%

No-Gi

Rating
1122
Record
0–4
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
1,256
Change over 90 days
-12
Highest rating in 12 months
1,269
Performance versus expectation
-
Schedule strength
-
Average opponent rating
1,423
Weighted win rate
-
Expected win rate
-
Repeat-opponent share
63%
Effective evidence
4.7
Confidence
62/100

Opponents

Opposition and rivalries

The strongest recorded win, rematches and opponents faced repeatedly.

Rematches 4–7 4–7 across 11 rematches against 4 repeat opponents.

Top 10 highest-ranked defeated opponents

Past 12 months

  1. #363 Rea Mayrberger · The Combatch Games 5: Kids & Teens - Berlin Sub 03:12 0–0 Earlier · Sub 03:55 0–2 January 31, 2026 · The Combatch Games 5: Kids & Teens - Berlin

Full career

  1. #363 Rea Mayrberger · The Combatch Games 5: Kids & Teens - Berlin Sub 03:12 0–0 Earlier · Sub 03:55 0–2 January 31, 2026 · The Combatch Games 5: Kids & Teens - Berlin

Rivals

Opponent Head-to-head record Matches
Elina Kachura 0–3 3
Maygan-lei Fox 2–1 3
Rea Mayrberger 2–1 3

Around this athlete

Athlete Rank Rating
Isabella Skierecki #1090 1,256
Noud De Jong #1091 1,256

Scheduled

  1. 2026 AGF Bremen Open

    Germany

    Gi Kids / Girls / Teen (14 - 15 yrs) / Gray / Middle II (Up to 61.20 kg) No Gi Kids / Girls / Teen (14 - 15 yrs) / Gray / Middle II (Up to 61.20 kg)
    Confirmed

  2. King Tatami - BJJ Kids Pro

    Germany

    Girls Gi / 14-15 Jahre/Years / -65 kg Girls No-Gi / 14-15 Jahre/Years / -65 kg
    Confirmed

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 -1 Rating 1,256

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
Opponents
3 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 1,257

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
Opponents
3 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 0 Rating 1,257

Rating-period composition

Rating matches
8 0
Record
2–6 Previous month 2–6
Opponents
3 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 3 new matches Change -14 Rating 1,257

Rating-period composition

Rating matches
8 +3
Record
2–6 Previous month 2–3
Opponents
3 +1
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.
Loss
May 23, 2026 Elina Kachura
NAGA Germany Grappling Championship Teens Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
Method Submission 01:15 0–0
Marginal influence -3
Loss
May 23, 2026 Elina Kachura
NAGA Germany Grappling Championship Teens No-Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
Method Submission 00:45 0–2
Marginal influence -13
Loss
May 23, 2026 Elina Kachura
NAGA Germany Grappling Championship Teens No-Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
Method Submission 00:16 0–0
Marginal influence -13
April 2026 No new matches Change +2 Rating 1,271

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
2 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 Change 0 Rating 1,269

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
2 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.

February 2026 No new matches Change 0 Rating 1,269

Rating-period composition

Rating matches
5 0
Record
2–3 Previous month 2–3
Opponents
2 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.

January 2026 5 new matches Change Starting point Rating 1,269

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
January 31, 2026 Rea Mayrberger
The Combatch Games 5: Kids & Teens - Berlin Teen Girls Gi / White / Teen 1 (12/13yrs) / - 55 kg
Method Submission 03:12 0–0
Marginal influence +18
Win
January 31, 2026 Rea Mayrberger
The Combatch Games 5: Kids & Teens - Berlin Teen Girls Gi / White / Teen 1 (12/13yrs) / - 55 kg
Method Submission 03:55 0–2
Marginal influence +18
Loss
January 31, 2026 Rea Mayrberger
The Combatch Games 5: Kids & Teens - Berlin Teen Girls Gi / White / Teen 1 (12/13yrs) / - 55 kg
Method Submission 03:08 2–0
Marginal influence -5
Loss
January 31, 2026 Luna Fischer
The Combatch Games 5: Kids & Teens - Berlin Teen Girls Nogi / Anfänger / Teen 1 (12/13yrs) / - 55 kg
Method Submission 02:07 0–4
Marginal influence -13
Loss
January 31, 2026 Luna Fischer
The Combatch Games 5: Kids & Teens - Berlin Teen Girls Nogi / Anfänger / Teen 1 (12/13yrs) / - 55 kg
Method Submission 04:00 0–3
Marginal influence -13
Relevant matches
4.7
Official ranking percentile
Top 74%
Performance
-

4.7 weighted matches against 3 different opponents across 2 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,423
Repeated-opponent share
62.5%
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 3 event votes Selected outcome

Registrations and outcomes

NAGA Germany Grappling Championship
U16 · Counts
Teens No-Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Teens Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
  • Competition age 14
  • Registered age: u16
  • Source category: u16
The Combatch Games 5: Kids & Teens - Berlin
U16 · Counts
Teen Girls Nogi / Anfänger / Teen 1 (12/13yrs) / - 55 kg
  • Competition age 14
  • Registered age: u14
  • Source category: u14
Teen Girls Gi / White / Teen 1 (12/13yrs) / - 55 kg
  • Competition age 14
  • Registered age: u14
  • Source category: u14
Flanders Open 2026
U16 · Counts
Youth Jiu-Jitsu BJJ FEMALE / U16 Show Match
  • Competition age 14
  • Registered age: u16
  • Source category: u16
Youth Ju-Jitsu Fighting FEMALE / U16 / -57 kg
  • Competition age 14
  • Registered age: u16
  • Source category: u16
TATAMY 17 KIDS (No-GI and GI round robin)
Does not count
Kids / Gi / 13-14 years / Girls / White/grey belt / -55 kg
  • Competition age 13

Classification evidence

Why ≤ 55 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

  • ≤ 55 kg 1 competition event Selected outcome
  • ≤ 57 kg 1 competition event
  • ≤ 60 kg 1 competition event

Registrations and outcomes

NAGA Germany Grappling Championship
≤ 60 kg · Counts as a competition event
Teens No-Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
  • Registered weight class: 55 - 59.9
  • Source competition limit: 55 - 59.9

2 matches in the rating period

NAGA Germany Grappling Championship
≤ 60 kg · Counts as a competition event
Teens Gi (Female) / Intermediate / 55 - 59.9 / 14-15 years
  • Registered weight class: 55 - 59.9
  • Source competition limit: 55 - 59.9

1 match in the rating period

The Combatch Games 5: Kids & Teens - Berlin
≤ 55 kg · Counts as a competition event
Teen Girls Nogi / Anfänger / Teen 1 (12/13yrs) / - 55 kg
  • Registered weight class: - 55 kg
  • Source competition limit: - 55 kg

2 matches in the rating period

The Combatch Games 5: Kids & Teens - Berlin
≤ 55 kg · Counts as a competition event
Teen Girls Gi / White / Teen 1 (12/13yrs) / - 55 kg
  • Registered weight class: - 55 kg
  • Source competition limit: - 55 kg

3 matches in the rating period

Flanders Open 2026
Does not count
Youth Jiu-Jitsu BJJ FEMALE / U16 Show Match

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

Flanders Open 2026
≤ 57 kg · Counts as a competition event
Youth Ju-Jitsu Fighting FEMALE / U16 / -57 kg
  • Registered weight class: -57 kg
  • Source competition limit: -57 kg

2 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
≤ 55 kg · Does not count
Kids / Gi / 13-14 years / Girls / White/grey belt / -55 kg
  • Registered weight class: -55 kg
  • Source competition limit: -55 kg

4 matches in the rating period · outside the three most recent unambiguous events

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 4 matches in the rating period Selected outcome
  • white 3 matches in the rating period

Registrations and outcomes

The Combatch Games 5: Kids & Teens - Berlin
white · Counts as a match
Teen Girls Gi / White / Teen 1 (12/13yrs) / - 55 kg
  • Source belt category: white

3 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 13-14 years / Girls / White/grey belt / -55 kg
  • Source belt category: grey

4 matches in the rating period