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Leon Kaiser

Top Brother Europe

W–L
3–4
Won and lost rating-eligible matches in the past 12 months.
Gi
1,260
Rating based on Gi matches in the past 12 months.
No-Gi
1,182
Rating based on No-Gi matches in the past 12 months.
Current form
3–4
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

6
Events
Date Event Result Format Division
NAGA Germany Grappling Championship Germany · Gi · 12–13 yo · 35–39.9 kg ; No-Gi · 12–13 yo · 35–39.9 kg 0–4 W–L: Win / Loss GiNo-Gi
  • Children No-Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
  • Children Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Germany · Gi · U16 · grey · ≤41 kg ; No-Gi · U16 · grey · ≤41 kg 1–1 W–L: Win / Loss GiNo-Gi
  • Boys Gi (under 16 y.o.) / Grey / 12-13 years / -41 kg
  • Boys No-Gi (under 16 y.o.) / Grey / 12-13 years / -46 kg
LET´S ROLL HENNEF I EBI SUB-ONLY Germany · Gi · 12–13 yo · ≤39 kg 1–0 W–L: Win / Loss Gi
  • Teens Boys Gi / Intermediate / 12-13 years / -39 kg
NAGA Europe Grappling Championship Germany · Gi · 12–13 yo · 40–44.9 kg ; No-Gi · 12–13 yo · 30–34.9 kg 1–2 W–L: Win / Loss GiNo-Gi
  • Children Gi (Male) / Beginner / 40 - 44.9 / 12-13 years
  • Children No-Gi (Male) / Beginner / 30 - 34.9 / 12-13 years
GERMAN NATIONAL KIDS OPEN CHAMPIONSHIP 2025 Germany · Gi · U16 · white · ≤38 kg 1–2 W–L: Win / Loss Gi
  • Boys Gi (under 16 y.o.) / White / 10-11 years / -38 kg
Lion Cub Jiu Jitsu Competition 3 the Netherlands · Gi · white · ≤34 kg 1–3 W–L: Win / Loss Gi
  • Place #4

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 1,302

Rating-period composition

Rating matches
7 0
Record
3–4 Previous month 3–4
Opponents
7 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.

July 2026 No new matches Change 0 Rating 1,302

Rating-period composition

Rating matches
7 0
Record
3–4 Previous month 3–4
Opponents
7 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.

June 2026 No new matches · 3 left period Change -2 Rating 1,302

Rating-period composition

Rating matches
7 -3
Record
3–4 Previous month 4–6
Opponents
7 -3
Events
4 -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.

May 2026 1 new match Change -4 Rating 1,304

Rating-period composition

Rating matches
10 +1
Record
4–6 Previous month 4–5
Opponents
10 +1
Events
5 +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 Reuben Burns
NAGA Germany Grappling Championship Children No-Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
Method Submission 02:51 0–4
Marginal influence -17
April 2026 No new matches Change +3 Rating 1,308

Rating-period composition

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

March 2026 No new matches Change -2 Rating 1,305

Rating-period composition

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

February 2026 2 new matches Change +51 Rating 1,307

Rating-period composition

Rating matches
9 +2
Record
4–5 Previous month 3–4
Opponents
9 +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.
Loss
February 7, 2026 Cemil Gül
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys No-Gi (under 16 y.o.) / Grey / 12-13 years / -46 kg
Method Submission 01:36 0–7
Marginal influence -21
Win
February 7, 2026 Roman Lantsman
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP Boys Gi (under 16 y.o.) / Grey / 12-13 years / -41 kg
Method Points 03:00 4–0
Marginal influence +27
January 2026 1 new match Change +45 Rating 1,256

Rating-period composition

Rating matches
7 +1
Record
3–4 Previous month 2–4
Opponents
7 +1
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.
Win
January 31, 2026 Isa Cördük
LET´S ROLL HENNEF I EBI SUB-ONLY Teens Boys Gi / Intermediate / 12-13 years / -39 kg
Method Submission 00:23
Marginal influence +25
December 2025 No new matches Change 0 Rating 1,211

Rating-period composition

Rating matches
6 0
Record
2–4 Previous month 2–4
Opponents
6 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 -1 Rating 1,211

Rating-period composition

Rating matches
6 0
Record
2–4 Previous month 2–4
Opponents
6 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 3 new matches · 4 left period Change +61 Rating 1,212

Rating-period composition

Rating matches
6 -1
Record
2–4 Previous month 2–5
Opponents
6 -1
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
October 4, 2025 Vincent Siebert
NAGA Europe Grappling Championship Children Gi (Male) / Beginner / 40 - 44.9 / 12-13 years
Method Submission 00:55 0–4
Marginal influence -10
Loss
October 4, 2025 Lars Umert
NAGA Europe Grappling Championship Children Gi (Male) / Beginner / 40 - 44.9 / 12-13 years
Method Decision 03:00 0–0
Marginal influence -20
Win
October 4, 2025 Artur Knodel
NAGA Europe Grappling Championship Children No-Gi (Male) / Beginner / 30 - 34.9 / 12-13 years
Method Submission 04:30 10–0
Marginal influence +9
September 2025 No new matches Change +2 Rating 1,151

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.

Relevant matches
6.7
Official ranking percentile
Top 61%
Performance
6.3 pp below expectation

6.7 weighted matches against 7 different opponents across 4 events

Weighted win rate
46.0%
Expected win rate
52.3%
Average opponent rating
1,246
Repeated-opponent share
0.0%
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
Children Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
  • Competition age 14
  • Registered age: u14
  • Source category: u14
Children No-Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
  • Competition age 14
  • Registered age: u14
  • Source category: u14
1 Adult 13 & Up Spectator ticket
COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
U16 · Counts
Boys No-Gi (under 16 y.o.) / Grey / 12-13 years / -46 kg
  • Competition age 14
  • Registered age: u14
  • Source category: u14
Boys Gi (under 16 y.o.) / Grey / 12-13 years / -41 kg
  • Competition age 14
  • Registered age: u14
  • Source category: u14
LET´S ROLL HENNEF I EBI SUB-ONLY
U16 · Counts
Teens Boys Gi / Intermediate / 12-13 years / -39 kg
  • Competition age 14
  • Registered age: u14
  • Source category: u14
NAGA Europe Grappling Championship
Does not count
Children No-Gi (Male) / Beginner / 30 - 34.9 / 12-13 years
  • Competition age 13
  • Registered age: u14
  • Source category: u14
Children Gi (Male) / Beginner / 40 - 44.9 / 12-13 years
  • Competition age 13
  • Registered age: u14
  • Source category: u14

Classification evidence

Why ≤ 39 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

  • ≤ 39 kg 1 competition event Selected outcome
  • ≤ 40 kg 1 competition event
  • ≤ 41 kg 1 competition event

Registrations and outcomes

NAGA Germany Grappling Championship
Does not count
Children Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
  • Registered weight class: 35 - 39.9
  • Source competition limit: 35 - 39.9

No matches in the rating period · no valid weight evidence

NAGA Germany Grappling Championship
≤ 40 kg · Counts as a competition event
Children No-Gi (Male) / Beginner / 35 - 39.9 / 12-13 years
  • Registered weight class: 35 - 39.9
  • Source competition limit: 35 - 39.9

1 match in the rating period

NAGA Germany Grappling Championship
Does not count
1 Adult 13 & Up Spectator ticket

No matches in the rating period · no valid weight evidence

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
≤ 41 kg · Counts as a competition event
Boys No-Gi (under 16 y.o.) / Grey / 12-13 years / -46 kg
  • Registered weight class: -41 kg
  • Source competition limit: -41 kg

1 match in the rating period

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
≤ 41 kg · Counts as a competition event
Boys Gi (under 16 y.o.) / Grey / 12-13 years / -41 kg
  • Registered weight class: -41 kg
  • Source competition limit: -41 kg

1 match in the rating period

LET´S ROLL HENNEF I EBI SUB-ONLY
≤ 39 kg · Counts as a competition event
Teens Boys Gi / Intermediate / 12-13 years / -39 kg
  • Registered weight class: -39 kg
  • Source competition limit: -39 kg

1 match in the rating period

NAGA Europe Grappling Championship
≤ 35 kg · Does not count
Children No-Gi (Male) / Beginner / 30 - 34.9 / 12-13 years
  • Registered weight class: 30 - 34.9
  • Source competition limit: 30 - 34.9

1 match in the rating period · conflicting upper weight limits make this event ambiguous

NAGA Europe Grappling Championship
≤ 45 kg · Does not count
Children Gi (Male) / Beginner / 40 - 44.9 / 12-13 years
  • Registered weight class: 40 - 44.9
  • Source competition limit: 40 - 44.9

2 matches in the rating period · conflicting upper weight limits make this event ambiguous

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 2 matches in the rating period Selected outcome

Registrations and outcomes

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
grey · Counts as a match
Boys No-Gi (under 16 y.o.) / Grey / 12-13 years / -46 kg
  • Source belt category: grey

1 match in the rating period

COLOGNE WINTER OPEN CHAMPIONSHIP 2026 I EUROPEAN CUP
grey · Counts as a match
Boys Gi (under 16 y.o.) / Grey / 12-13 years / -41 kg
  • Source belt category: grey

1 match in the rating period