Jan Koch - 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 +1 Rating 1,372

Rating-period composition

Rating matches: 19 0
Record: 9–10 Previous month 9–10
Opponents: 14 0
Events: 5 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 1,371

Rating-period composition

Rating matches: 19 0
Record: 9–10 Previous month 9–10
Opponents: 14 0
Events: 5 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 · 2 left period Change -25 Rating 1,372

Rating-period composition

Rating matches: 19 -2
Record: 9–10 Previous month 11–10
Opponents: 14 0
Events: 5 -1

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.

May 2026 No new matches Change -3 Rating 1,397

Rating-period composition

Rating matches: 21 0
Record: 11–10 Previous month 11–10
Opponents: 14 0
Events: 6 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 -1 Rating 1,400

Rating-period composition

Rating matches: 21 0
Record: 11–10 Previous month 11–10
Opponents: 14 0
Events: 6 0

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

March 2026 4 new matches Change +21 Rating 1,401

Rating-period composition

Rating matches: 21 +4
Record: 11–10 Previous month 9–8
Opponents: 14 +3
Events: 6 +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

March 7, 2026 Lukáš Habich

2026 AGF Prague Championships No Gi Kids Challenger / Boys / White Challenger / Feather III (Up to 38.60 kg)

Method Submission 00:57 0–2

Marginal influence +9

Loss

March 7, 2026 Matyáš Habich

2026 AGF Prague Championships No Gi Kids Challenger / Boys / White Challenger / Feather III (Up to 38.60 kg)

Method Points 03:00 0–2

Marginal influence -10

Win

March 7, 2026 Unknown opponent

2026 AGF Prague Championships No Gi Kids / Mixed / Kids (8 - 9 yrs) / White / Feather II (Up to 34.00 kg)

Method Points 03:00 14–3

Marginal influence +19

Loss

March 7, 2026 Matyáš Habich

2026 AGF Prague Championships No Gi Kids / Mixed / Kids (8 - 9 yrs) / White / Feather II (Up to 34.00 kg)

Method Submission 00:27 0–3

Marginal influence -10

February 2026 No new matches Change +3 Rating 1,380

Rating-period composition

Rating matches: 17 0
Record: 9–8 Previous month 9–8
Opponents: 11 0
Events: 5 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 1,377

Rating-period composition

Rating matches: 17 0
Record: 9–8 Previous month 9–8
Opponents: 11 0
Events: 5 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 · 3 left period Change +49 Rating 1,377

Rating-period composition

Rating matches: 17 -3
Record: 9–8 Previous month 9–11
Opponents: 11 -3
Events: 5 -1

3 older matches left the 12-month period: 0 won and 3 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

November 2025 2 new matches · 6 left period Change +69 Rating 1,328

Rating-period composition

Rating matches: 20 -4
Record: 9–11 Previous month 8–16
Opponents: 14 -3
Events: 6 -1

6 older matches left the 12-month period: 0 won and 6 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 23, 2025 Ingrid Chmelarova

ADCC Czech National Championship 2025 Boys Junior / 11-12 years / Beginner / -36 kg

Method Submission 01:05 0–0

Marginal influence +15

Loss

November 23, 2025 Adéla Gutov Jeličová

ADCC Czech National Championship 2025 Boys Junior / 11-12 years / Beginner / -36 kg

Method Submission 02:24 0–0

Marginal influence -7

October 2025 8 new matches · 4 left period Change +111 Rating 1,259

Rating-period composition

Rating matches: 24 +4
Record: 8–16 Previous month 4–16
Opponents: 17 +3
Events: 7 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 25, 2025 Simon Kovac

N-GEN Kids BJJ Tournament #3 Boys No-Gi / All belt / Junior (10-11yrs) / -36 kg (2014,2015)

Method Points 03:00 0–14

Marginal influence -9

Loss

October 25, 2025 Adéla Gutov Jeličová

N-GEN Kids BJJ Tournament #3 Boys No-Gi / All belt / Junior (10-11yrs) / -36 kg (2014,2015)

Method Submission 00:47 0–0

Marginal influence -7

Win

October 25, 2025 David Polášek

N-GEN Kids BJJ Tournament #3 Boys No-Gi / All belt / Junior (10-11yrs) / -36 kg (2014,2015)

Method Submission 00:59 6–0

Marginal influence +6

Win

October 5, 2025 Vojtěch Jána

AOM Cup Kids 3 Boys NoGi / White / U09 (2017,2016) / -42 kg

Method Points 03:00 9–2

Marginal influence +22

Win

October 5, 2025 Denis Kaplon

AOM Cup Kids 3 Boys NoGi / White / U09 (2017,2016) / -42 kg

Method Submission 02:00 18–2

Marginal influence +11

Win

October 5, 2025 Filip Vesely

AOM Cup Kids 3 Boys NoGi / White / U09 (2017,2016) / -42 kg

Method Submission 00:40 4–0

Marginal influence +14

Win

October 5, 2025 Michal Mitlehner

AOM Cup Kids 3 NoGi Challenge / -36 kg

Method Points 03:00 7–0

Marginal influence +13

Loss

October 5, 2025 Miroslav Lagron

AOM Cup Kids 3 NoGi Challenge / -36 kg

Method Points 03:00 0–13

Marginal influence -8

September 2025 5 new matches Change -24 Rating 1,148

Rating-period composition

Rating matches: 20 +5
Record: 4–16 Previous month 3–12
Opponents: 14 +1
Events: 7 +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

September 27, 2025 Unknown opponent

2025 AGF Prague Open No Gi Kids Challenger / Boys / Regular Challenger / Feather II (Up to 34.00 kg)

Method Points 03:00 0–5

Marginal influence -20

Loss

September 27, 2025 Alex Janda

2025 AGF Prague Open No Gi Kids Challenger / Boys / Regular Challenger / Feather II (Up to 34.00 kg)

Method Points 03:00 4–8

Marginal influence -9

Loss

September 27, 2025 Alex Janda

2025 AGF Prague Open No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Feather II (Up to 34.00 kg)

Method Points 03:00 4–23

Marginal influence -9

Loss

September 27, 2025 Alex Janda

2025 AGF Prague Open No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Feather II (Up to 34.00 kg)

Method Points 03:00 0–1

Marginal influence -9

Win

September 27, 2025 Alex Janda

2025 AGF Prague Open No Gi Kids / Boys / Kids (8 - 9 yrs) / Gray / Feather II (Up to 34.00 kg)

Method Points 03:00 6–5

Marginal influence +9

Relevant matches: 11.3

Official ranking percentile: Top 36%

Performance: 3.1 pp above expectation

11.3 weighted matches against 14 different opponents across 5 events

Weighted win rate: 54.2%
Expected win rate: 51.2%
Average opponent rating: 1,382
Repeated-opponent share: 26.3%
Network connectivity: 80.9%