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CZ

Jan Rác

5th Dimension BJJ

≤ 30 kg
W–L
5–2
Won and lost rating-eligible matches in the past 12 months.
Gi
1,283
Rating based on Gi matches in the past 12 months.
No-Gi
1,331
Rating based on No-Gi matches in the past 12 months.
Current form
7–3
Results from the ten most recent rating-eligible matches.
Opponents
5
Unique opponents faced in rating-eligible matches in the past 12 months.

Scheduled

  2. TATAMY 23: PRAGUE - KIDS (round robin)

    CZ

    Kids / No Gi / 10-12 years / Boys / Intermediate / -28 kg Kids / Gi / 10-12 years / Boys / Yellow/orange/green belt / -28 kg
    Unconfirmed

Tournament history

Events

27
Events
Date Event Result Format Division
ADCC Amateur World Championship 2026 PL · No-Gi · 9–10 yo · ≤28 kg 0–1 W–L: Win / Loss No-Gi
  • Place #9
NAGA Germany Grappling Championship Germany · Gi · 10–11 yo · 25–29.9 kg ; No-Gi · 10–11 yo · 25–29.9 kg 5–2 W–L: Win / Loss GiNo-Gi
  • Children No-Gi (Male) / Expert / 25 - 29.9 / 10-11 years
  • Children Gi (Male) / Expert / 25 - 29.9 / 10-11 years
CFS 13 CZECH CHAMPIONSHIP ČSAKJ 2026 CZ · Gi · U12 · ≤30 kg 2–0 W–L: Win / Loss Gi
  • Grappling Gi / U12 Děti chlapci / -30 kg
TATAMY 20: PRAGUE - KIDS (round robin) CZ · Gi · 10–12 yo · white/grey · ≤32 kg 3–0 W–L: Win / Loss Gi
  • Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg
GRIND 12 Kids (NO-GI & GI ROUND ROBIN) CZ · Gi · 10–12 yo · ≤28 kg 2–0 W–L: Win / Loss Gi
  • Gi / 10-12 years / Boy / -28 kg / Advanced
Christmas Kids Ground BJJ Tour - Finálové kolo 2025 CZ · Gi · 9–11 yo · ≤30 kg 2–0 W–L: Win / Loss Gi
  • Kids mix 9-11 let - Kimono / -30kg
TATAMY 17 KIDS (No-GI and GI round robin) CZ · Gi · 10–12 yo · white/grey · ≤28 kg ; Gi · 10–12 yo · white/grey · ≤32 kg ; No-Gi · 10–12 yo · ≤28 kg 7–0 W–L: Win / Loss GiNo-Gi
  • Kids / No Gi / 10-12 years / Boys / Beginner / -28 kg
  • Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg
  • Kids / Gi / 10-12 years / Boys / White/grey belt / -28 kg
Ground Bjj Tour 4. - Only submission - Kladno CZ · Gi · 9–11 yo · ≤30 kg 3–0 W–L: Win / Loss Gi
  • Kids mix 9-11 let - Kimono / -30kg
CZECH FIGHTING SERIES 11, Samurai Cup 2025 CZ · Gi · U12 · ≤30 kg ; No-Gi · U12 · ≤30 kg 4–0 W–L: Win / Loss GiNo-Gi
  • Grappling NoGi / U12 Děti chlapci / -30 kg
  • Grappling Gi / U12 Děti chlapci / -30 kg
Ground Bjj Tour 3. - only submission - Kladno CZ · Gi · 9–11 yo · ≤30 kg 3–0 W–L: Win / Loss Gi
  • Kids mix 9-11 let / -30kg
NAGA Germany Grappling Championship Germany · No-Gi · 8–9 yo · 20–24.9 kg 2–0 W–L: Win / Loss No-Gi
  • Children No-Gi (Male) / Expert / 20 - 24.9 / 8-9 years
ADCC Amateur World Championship 2025 PL · No-Gi · 9–10 yo · ≤24 kg 1–1 W–L: Win / Loss No-Gi
  • Boys 9-10 years / Boys 9-10 years / -24 kg
TATAMY 15 KIDS (No-GI and GI round robin) CZ · Gi · 7–9 yo · ≤28 kg ; No-Gi · 7–9 yo · ≤28 kg 6–3 W–L: Win / Loss GiNo-Gi
  • Place #5
  • Kids / Gi / 7-9 years / Mix / All levels / -28 kg
ADCC Czech Open 2025 CZ · No-Gi · 9–10 yo · ≤24 kg 1–1 W–L: Win / Loss No-Gi
  • Kids Mix 9-10 years / Beginner / -24Kg
GROUND BJJ TOUR - Only Submission - GI and NOGI - Round Robin CZ · 7–9 yo · ≤27 kg ; No-Gi · ≤27 kg 6–2 W–L: Win / Loss No-Gi
  • Men/Boys GRAPPLING NO-GI / Cadets (10-11) years / -27kg
  • Men/Boys - KIMONO - NE WAZA / Cadets (7-8-9) years / kimono -27kg
INTERNATIONAL CZECH CHAMPIONSHIP ČSAKJ 2025 - CFS 10 CZ · Gi · U12 · ≤25 kg ; No-Gi · U12 · ≤25 kg 5–0 W–L: Win / Loss GiNo-Gi
  • Grappling Gi / U12 Děti chlapci / -25 kg
  • Grappling NoGi / U12 Děti chlapci / -25 kg
GRIND 9 NO-GI & GI ROUND ROBIN with kids CZ · Gi · 7–9 yo · ≤24 kg ; No-Gi · 7–9 yo · ≤28 kg 3–1 W–L: Win / Loss GiNo-Gi
  • Kids Gi / 7-9 years / Mixed / -24 kg / Beginner (4 - 9 years)
  • Kids No-Gi / 7-9 years / Mixed / -28 kg / Beginner
Grappling Industries NUREMBERG Germany · Gi · 8–9 yo · grey · ≤55 lb ; No-Gi · 8–9 yo · grey · ≤55 lb 4–0 W–L: Win / Loss GiNo-Gi
  • Gi Kids / Grey / 8 - 9 years / -55 lbs
  • No Gi Kids / Intermediate (Grey) / 8 - 9 years / -55 lbs
2025 AGF Prague Jiu Jitsu Championships CZ · Gi · 8–9 yo · grey · ≤24.94 kg ; No-Gi · 10–11 yo · yellow · ≤29.5 kg 3–1 W–L: Win / Loss GiNo-Gi
  • No Gi Kids / Boys / Pre Teen (10 - 11 yrs) / Yellow / Feather I (Up to 29.50 kg)
  • Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Rooster III (Up to 24.94 kg)
TATAMY 13 KIDS (No-GI and GI round robin) CZ · Gi · 7–9 yo · ≤24 kg ; No-Gi · 7–9 yo · ≤24 kg 7–3 W–L: Win / Loss GiNo-Gi
  • Kids / No Gi / 7-9 years / Mix / All levels / -24 kg
  • Kids / Gi / 7-9 years / Mix / All levels / -24 kg
Ground Bjj Tour - Praha Chodov - (Ne - Waza) CZ · Gi · 10–11 yo · ≤27 kg 2–0 W–L: Win / Loss Gi
  • Men/Boys Ne-Waza / Cadets (10-11) years / -27 kg
2024 Prague Open CZ · Gi · 8–9 yo · grey · ≤24.94 kg 2–1 W–L: Win / Loss Gi
  • Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Rooster III (Up to 24.94 kg)
Grappling Industries AUSTRIA AT · Gi · 8–9 yo · grey · ≤55 lb ; No-Gi · 8–9 yo · grey · ≤55 lb 5–0 W–L: Win / Loss GiNo-Gi
  • Gi Kids / Grey / 8 - 9 years / -55 lbs
  • No Gi Kids / Intermediate (Grey) / 8 - 9 years / -55 lbs
AOM Cup Kids 2 CZ · Gi · U9 · white/grey · ≤26 kg 2–2 W–L: Win / Loss Gi
  • Mix Gi / White / Grey / U09 (2016,2015) / -26 kg
NAGA Germany Grappling Championship Germany · Gi · 8–9 yo · 25–29.9 kg ; No-Gi · 7–8 yo · 20–24.9 kg 3–1 W–L: Win / Loss GiNo-Gi
  • Children Gi (Male) / Beginner / 25 - 29.9 / 8-9 years
  • Children No-Gi (Male) / Beginner / 20 - 24.9 / 7-8 years
ADCC Amateur World Championship 2024 PL · No-Gi · 9–10 yo · ≤24 kg 1–1 W–L: Win / Loss No-Gi
  • Boys 9-10 years / Beginner / -24 kg
Grappling Industries VIENNA AT · Gi · 8–9 yo · grey · ≤55 lb ; No-Gi · 8–9 yo · grey · ≤55 lb 2–4 W–L: Win / Loss GiNo-Gi
  • Gi Kids / Grey / 8 - 9 years / -55 lbs
  • 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 +1 Rating 1,390

Rating-period composition

Rating matches
7 0
Record
5–2 Previous month 5–2
Opponents
5 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 0 Rating 1,389

Rating-period composition

Rating matches
7 0
Record
5–2 Previous month 5–2
Opponents
5 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 1,389

Rating-period composition

Rating matches
7 0
Record
5–2 Previous month 5–2
Opponents
5 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 7 new matches · 1 left period Change +148 Rating 1,389

Rating-period composition

Rating matches
7 +6
Record
5–2 Previous month 1–0
Opponents
5 +4
Events
1 0

1 older matches left the 12-month period: 1 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
May 23, 2026 Matvii Poliakov
NAGA Germany Grappling Championship Children No-Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Points 02:53 8–0
Marginal influence +23
Win
May 23, 2026 Maximilian Jurk
NAGA Germany Grappling Championship Children No-Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Points 00:48 3–0
Marginal influence +19
Loss
May 23, 2026 Yahya Adam
NAGA Germany Grappling Championship Children No-Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Points 02:27 0–4
Marginal influence -12
Win
May 23, 2026 Leonardo Parente
NAGA Germany Grappling Championship Children No-Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Points 02:51 8–1
Marginal influence +13
Loss
May 23, 2026 Yahya Adam
NAGA Germany Grappling Championship Children Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Submission 02:43 0–11
Marginal influence -13
Win
May 23, 2026 Davyd Khachatrian
NAGA Germany Grappling Championship Children Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Submission 03:48 2–0
Marginal influence +14
Win
May 23, 2026 Leonardo Parente
NAGA Germany Grappling Championship Children Gi (Male) / Expert / 25 - 29.9 / 10-11 years
Method Submission 00:19 3–0
Marginal influence +6
April 2026 No new matches Change -4 Rating 1,241

Rating-period composition

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

March 2026 No new matches · 4 left period Change -147 Rating 1,245

Rating-period composition

Rating matches
1 -4
Record
1–0 Previous month 5–0
Opponents
1 -2
Events
1 -1

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.

February 2026 No new matches Change 0 Rating 1,392

Rating-period composition

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

January 2026 No new matches Change 0 Rating 1,392

Rating-period composition

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

December 2025 No new matches Change 0 Rating 1,392

Rating-period composition

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

November 2025 No new matches Change 0 Rating 1,392

Rating-period composition

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

October 2025 No new matches Change -7 Rating 1,392

Rating-period composition

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

September 2025 No new matches Change +11 Rating 1,399

Rating-period composition

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

Relevant matches
5.1
Official ranking percentile
-
Performance
-

5.1 weighted matches against 5 different opponents across 1 events

Weighted win rate
-
Expected win rate
-
Average opponent rating
1,373
Repeated-opponent share
28.6%
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 5 event votes Selected outcome

Registrations and outcomes

NAGA Germany Grappling Championship
U12 · Counts
Children No-Gi (Male) / Expert / 25 - 29.9 / 10-11 years
  • Competition age 11
  • Registered age: u12
  • Source category: u12
Children Gi (Male) / Expert / 25 - 29.9 / 10-11 years
  • Competition age 11
  • Registered age: u12
  • Source category: u12
Grappling Industries PRAGUE
U12 · Counts
Gi Kids / Yellow/Orange / 10 - 11 years / -75 lbs
  • Competition age 11
  • Registered age: u12
  • Source category: u12
CFS 13 CZECH CHAMPIONSHIP ČSAKJ 2026
U12 · Counts
Grappling Gi / U12 Děti chlapci / -30 kg
  • Competition age 11
  • Registered age: u12
  • Source category: u12
TATAMY 20: PRAGUE - KIDS (round robin)
U12 · Counts
Kids / Gi / 10-12 years / Boys / Yellow/orange/green belt / -28 kg
  • Competition age 11
Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg
  • Competition age 11
GRIND 12 Kids (NO-GI & GI ROUND ROBIN)
U12 · Counts
No-Gi / 10-12 years / Boy / -28 kg / Advanced
  • Competition age 11
Gi / 10-12 years / Boy / -28 kg / Advanced
  • Competition age 11
Christmas Kids Ground BJJ Tour - Finálové kolo 2025
Does not count
Kids mix 9-11 let - Kimono / -30kg
  • Competition age 10
TATAMY 17 KIDS (No-GI and GI round robin)
Does not count
Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg
  • Competition age 10
Kids / No Gi / 10-12 years / Boys / Beginner / -28 kg
  • Competition age 10
Kids / Gi / 10-12 years / Boys / White/grey belt / -28 kg
  • Competition age 10
Ground Bjj Tour 4. - Only submission - Kladno
Does not count
Kids mix 9-11 let - Kimono / -30kg
  • Competition age 10
CZECH FIGHTING SERIES 11, Samurai Cup 2025
Does not count
Grappling NoGi / U12 Děti chlapci / -30 kg
  • Competition age 10
  • Registered age: u12
  • Source category: u12
Grappling Gi / U12 Děti chlapci / -30 kg
  • Competition age 10
  • Registered age: u12
  • Source category: u12
AOM Cup Kids 3
Does not count
Boys NoGi / Grey / U12 (2015,2014,2013) / -30 kg
  • Competition age 10
  • Registered age: u12
  • Source category: u12
Boys Gi / Grey / U12 (2015,2014,2013) / -30 kg
  • Competition age 10
  • Registered age: u12
  • Source category: u12

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 8 matches in the rating period Selected outcome

Registrations and outcomes

TATAMY 20: PRAGUE - KIDS (round robin)
grey · Counts as a match
Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg
  • Source belt category: grey

3 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 10-12 years / Boys / White/grey belt / -28 kg
  • Source belt category: grey

2 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg
  • Source belt category: grey

3 matches in the rating period