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Kosta Stefanou

BROTHERS GYM JIU JITSU (BGJ BRUXELLES)

W–L
0–3
Won and lost rating-eligible matches in the past 12 months.
Gi
1,110
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
0–3
Results from the ten most recent rating-eligible matches.
Opponents
2
Unique opponents faced in rating-eligible matches in the past 12 months.

Indexed career

Matches

4
Indexed competition matches
Date Opponent Result Event Division
2026-03-14 Aiden Van Der Steen
Loss
OPEN BRUSSELS 2 FBJJB RANKING KID GI & NoGi 14.03.2025 Gi · BOY GI DIVISION (-16years old) / KID GI / KID (-16years old) / -43kg (cat 1 : 9-10-11-12)
2026-03-14 Nael Carrera
Loss
OPEN BRUSSELS 2 FBJJB RANKING KID GI & NoGi 14.03.2025 Gi · BOY GI DIVISION (-16years old) / KID GI / KID (-16years old) / -43kg (cat 1 : 9-10-11-12)
2025-11-29 Yamine Chakour
Loss
Grappling Industries BRUSSELS Gi · Gi Kids / Grey / 8 - 9 years / -85 lbs
2025-11-29 Yamine Chakour
Loss
Grappling Industries BRUSSELS Gi · Gi Kids / Grey / 8 - 9 years / -85 lbs

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 1,110

Rating-period composition

Rating matches
3 0
Record
0–3 Previous month 0–3
Opponents
2 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 -1 Rating 1,109

Rating-period composition

Rating matches
3 0
Record
0–3 Previous month 0–3
Opponents
2 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 1,110

Rating-period composition

Rating matches
3 0
Record
0–3 Previous month 0–3
Opponents
2 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 Change -1 Rating 1,109

Rating-period composition

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

April 2026 No new matches Change 0 Rating 1,110

Rating-period composition

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

March 2026 1 new match Change -14 Rating 1,110

Rating-period composition

Rating matches
3 +1
Record
0–3 Previous month 0–2
Opponents
2 +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
March 14, 2026 Nael Carrera
OPEN BRUSSELS 2 FBJJB RANKING KID GI & NoGi 14.03.2025 BOY GI DIVISION (-16years old) / KID GI / KID (-16years old) / -43kg (cat 1 : 9-10-11-12)
Method Points 04:00 0–17
Marginal influence -29
February 2026 No new matches Change 0 Rating 1,124

Rating-period composition

Rating matches
2 0
Record
0–2 Previous month 0–2
Opponents
1 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 No new matches Change 0 Rating 1,124

Rating-period composition

Rating matches
2 0
Record
0–2 Previous month 0–2
Opponents
1 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.

December 2025 No new matches Change 0 Rating 1,124

Rating-period composition

Rating matches
2 0
Record
0–2 Previous month 0–2
Opponents
1 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.

November 2025 2 new matches Change Starting point Rating 1,124

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 29, 2025 Yamine Chakour
Grappling Industries BRUSSELS Gi Kids / Grey / 8 - 9 years / -85 lbs
Method Points 03:00 2–6
Marginal influence -24
Loss
November 29, 2025 Yamine Chakour
Grappling Industries BRUSSELS Gi Kids / Grey / 8 - 9 years / -85 lbs
Method Points 03:00 4–9
Marginal influence -24
Relevant matches
2.2
Official ranking percentile
-
Performance
-

2.2 weighted matches against 2 different opponents across 2 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,262
Repeated-opponent share
33.3%
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 1 event vote Selected outcome

Registrations and outcomes

OPEN BRUSSELS 2 FBJJB RANKING KID GI & NoGi 14.03.2025
U12 · Counts
BOY GI DIVISION (-16years old) / KID GI / KID (-16years old) / -43kg (cat 1 : 9-10-11-12)
  • Competition age 10
Grappling Industries BRUSSELS
Does not count
Gi Kids / Grey / 8 - 9 years / -85 lbs
  • Competition age 9
  • Registered age: u10
  • Source category: u10

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
  • ≤ 43 kg 1 competition event

Registrations and outcomes

OPEN BRUSSELS 2 FBJJB RANKING KID GI & NoGi 14.03.2025
≤ 43 kg · Counts as a competition event
BOY GI DIVISION (-16years old) / KID GI / KID (-16years old) / -43kg (cat 1 : 9-10-11-12)
  • Registered weight class: -43kg (cat 1 : 9-10-11-12)
  • Source competition limit: -43kg (cat 1 : 9-10-11-12)

1 match in the rating period

Grappling Industries BRUSSELS
≤ 39 kg · Counts as a competition event
Gi Kids / Grey / 8 - 9 years / -85 lbs
  • Registered weight class: -85 lbs
  • Source competition limit: -85 lbs

2 matches in the rating period

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

Grappling Industries BRUSSELS
grey · Counts as a match
Gi Kids / Grey / 8 - 9 years / -85 lbs
  • Source belt category: grey

2 matches in the rating period