Jan Rác - Rating | TopBJJ Index

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 1,643

Rating-period composition

Rating matches: 30 0
Record: 28–2 Previous month 28–2
Opponents: 23 0
Events: 8 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 1,643

Rating-period composition

Rating matches: 30 0
Record: 28–2 Previous month 28–2
Opponents: 23 0
Events: 8 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 -3 Rating 1,643

Rating-period composition

Rating matches: 30 0
Record: 28–2 Previous month 28–2
Opponents: 23 0
Events: 8 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 · 15 left period Change -5 Rating 1,646

Rating-period composition

Rating matches: 30 -8
Record: 28–2 Previous month 34–4
Opponents: 23 -3
Events: 8 -3

15 older matches left the 12-month period: 11 won and 4 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 +2

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 +1

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 -11

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 -2

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 -18

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 +12

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 +4

April 2026 2 new matches · 5 left period Change +19 Rating 1,651

Rating-period composition

Rating matches: 38 -3
Record: 34–4 Previous month 35–6
Opponents: 26 0
Events: 11 -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.

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

April 12, 2026 Jan Brázda

CFS 13 CZECH CHAMPIONSHIP ČSAKJ 2026 Grappling Gi / U12 Děti chlapci / -30 kg

Method Submission 00:30 3–0

Marginal influence +6

Win

April 12, 2026 Martin Skřítek

CFS 13 CZECH CHAMPIONSHIP ČSAKJ 2026 Grappling Gi / U12 Děti chlapci / -30 kg

Method Submission 00:59 4–0

Marginal influence +5

March 2026 3 new matches · 17 left period Change -21 Rating 1,632

Rating-period composition

Rating matches: 41 -14
Record: 35–6 Previous month 47–8
Opponents: 26 -7
Events: 12 -3

17 older matches left the 12-month period: 15 won and 2 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

March 21, 2026 Unknown opponent

TATAMY 20: PRAGUE - KIDS (round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg

Method Decision 04:00 0–0

Marginal influence +7

Win

March 21, 2026 Viktor Vacek

TATAMY 20: PRAGUE - KIDS (round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg

Method Points 04:00 2–0

Marginal influence +3

Win

March 21, 2026 Vojtěch Jána

TATAMY 20: PRAGUE - KIDS (round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg

Method Submission 02:23 6–0

Marginal influence +17

February 2026 No new matches · 10 left period Change +4 Rating 1,653

Rating-period composition

Rating matches: 55 -10
Record: 47–8 Previous month 54–11
Opponents: 33 -6
Events: 15 -1

10 older matches left the 12-month period: 7 won and 3 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

January 2026 2 new matches · 2 left period Change +13 Rating 1,649

Rating-period composition

Rating matches: 65 0
Record: 54–11 Previous month 54–11
Opponents: 39 +1
Events: 16 0

2 older matches left the 12-month period: 2 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

January 24, 2026 Unknown opponent

GRIND 12 Kids (NO-GI & GI ROUND ROBIN) Gi / 10-12 years / Boy / -28 kg / Advanced

Method Points 04:00 4–0

Marginal influence +8

Win

January 24, 2026 Unknown opponent

GRIND 12 Kids (NO-GI & GI ROUND ROBIN) Gi / 10-12 years / Boy / -28 kg / Advanced

Method Points 04:00 11–2

Marginal influence +9

December 2025 2 new matches Change +3 Rating 1,636

Rating-period composition

Rating matches: 65 +2
Record: 54–11 Previous month 52–11
Opponents: 38 0
Events: 16 +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

December 14, 2025 Viktor Vacek

Christmas Kids Ground BJJ Tour - Finálové kolo 2025 Kids mix 9-11 let - Kimono / -30kg

Method Other recorded result 01:24 10–0

Marginal influence +4

Win

December 14, 2025 Luka Long

Christmas Kids Ground BJJ Tour - Finálové kolo 2025 Kids mix 9-11 let - Kimono / -30kg

Method Other recorded result 01:01 10–0

Marginal influence +8

November 2025 7 new matches · 3 left period Change +25 Rating 1,633

Rating-period composition

Rating matches: 63 +4
Record: 52–11 Previous month 47–12
Opponents: 38 +5
Events: 15 0

3 older matches left the 12-month period: 2 won and 1 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

November 1, 2025 Ladislav Kolaja

TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -28 kg

Method Submission 00:48 0–0

Marginal influence +4

Win

November 1, 2025 Viktor Vacek

TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -28 kg

Method Submission 01:27 0–0

Marginal influence +3

Win

November 1, 2025 Michael Goroĺ Dudy

TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg

Method Points 04:00 4–2

Marginal influence +7

Win

November 1, 2025 Filip Vesely

TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg

Method Submission 00:26 0–0

Marginal influence +5

Win

November 1, 2025 Valentin Karavans

TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 10-12 years / Boys / White/grey belt / -32 kg

Method Disqualification 03:37 4–2

Marginal influence +7

Win

November 1, 2025 Oleksandr Karamyshev

TATAMY 17 KIDS (No-GI and GI round robin) Kids / No Gi / 10-12 years / Boys / Beginner / -28 kg

Method Submission 01:08 0–0

Marginal influence -1

Win

November 1, 2025 Oleksandr Karamyshev

TATAMY 17 KIDS (No-GI and GI round robin) Kids / No Gi / 10-12 years / Boys / Beginner / -28 kg

Method Points 04:00 9–0

Marginal influence -1

October 2025 7 new matches · 9 left period Change +7 Rating 1,608

Rating-period composition

Rating matches: 59 -2
Record: 47–12 Previous month 47–14
Opponents: 33 -1
Events: 15 0

9 older matches left the 12-month period: 7 won and 2 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

October 19, 2025 Viktor Vacek

Ground Bjj Tour 4. - Only submission - Kladno Kids mix 9-11 let - Kimono / -30kg

Method Other recorded result 01:57 10–0

Marginal influence +3

Win

October 19, 2025 Kristian Kubíček

Ground Bjj Tour 4. - Only submission - Kladno Kids mix 9-11 let - Kimono / -30kg

Method Other recorded result 00:33 10–0

Marginal influence +6

Win

October 19, 2025 Adam Martin

Ground Bjj Tour 4. - Only submission - Kladno Kids mix 9-11 let - Kimono / -30kg

Method Other recorded result 01:40 10–0

Marginal influence +6

Win

October 18, 2025 Gabriel Palumbo

CZECH FIGHTING SERIES 11, Samurai Cup 2025 Grappling Gi / U12 Děti chlapci / -30 kg

Method Points 02:00 10–0

Marginal influence +7

Win

October 18, 2025 Petr Chvostal

CZECH FIGHTING SERIES 11, Samurai Cup 2025 Grappling Gi / U12 Děti chlapci / -30 kg

Method Points 02:00 24–0

Marginal influence +4

Win

October 18, 2025 Petr Krejčík

CZECH FIGHTING SERIES 11, Samurai Cup 2025 Grappling NoGi / U12 Děti chlapci / -30 kg

Method Submission 01:48 0–0

Marginal influence 0

Win

October 18, 2025 Vasil Batryn

CZECH FIGHTING SERIES 11, Samurai Cup 2025 Grappling NoGi / U12 Děti chlapci / -30 kg

Method Points 02:00 0–0

Marginal influence +1

September 2025 No new matches Change +5 Rating 1,601

Rating-period composition

Rating matches: 61 0
Record: 47–14 Previous month 47–14
Opponents: 34 0
Events: 15 0

No matches were added or left the period. The change comes from the monthly revaluation of opponents across the full network.

Relevant matches: 20.6

Official ranking percentile: Top 1%

Performance: 20.6 pp above expectation

20.6 weighted matches against 23 different opponents across 8 events

Weighted win rate: 93.0%
Expected win rate: 72.4%
Average opponent rating: 1,354
Repeated-opponent share: 23.3%
Network connectivity: 80.9%