TopBJJ Index Youth

TopBJJ Index

Search TopBJJ Index
Language selector
Menu
CZ

Samuel Kulak

Draculino Karviná

W–L
10–5
Won and lost rating-eligible matches in the past 12 months.
Gi
1,393
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
6–4
Results from the ten most recent rating-eligible matches.
Opponents
13
Unique opponents faced in rating-eligible matches in the past 12 months.

Honours

Medals and placements

Gold
1
Silver
2
Bronze
4
Total medals
7
Events with results
7

Full career record

Wins
11
Losses
8
Matches
19
Win rate
57.9%

Ways of winning

Submission
9
Points
1
Decision
1
Disqualification
0

Personal records

Longest winning streak
4
Longest submission streak
3
Longest gold streak
1

Recent recorded placements

  1. TATAMY 20: PRAGUE - KIDS (round robin)

    CZ Event record 0–0

    • Bronze

12-month performance profile

How the results were achieved

Past 12 months
Current win streak
3
Unique opponents
13
Distinct events
4

Ways of winning

  • Submission 8 80%
  • Points 1 10%
  • Decision 1 10%
  • Other recorded result 0 0%

Gi versus No-Gi

Gi

Rating
1393
Record
10–5
Win rate
67%
Submission share
80%

No-Gi

Rating
-
Record
-
Win rate
-
Submission share
-

Win quality

Grouped by pre-match win probability. This provides context and does not award an extra rating bonus.

As underdog 0–0 Less than 35% expected win probability before the match.
Even match 0–0 Between 35% and 65% expected win probability before the match.
As favourite 0–0 More than 65% expected win probability before the match.

Development

Rating and development

The same published rating, supported by trend, opponent strength and evidence quality.

Current rating
1,393
Change over 90 days
+102
Highest rating in 12 months
1,401
Performance versus expectation
+10.4 pp
Schedule strength
Top 77%
Average opponent rating
1,279
Weighted win rate
66%
Expected win rate
56%
Repeat-opponent share
13%
Effective evidence
9.9
Confidence
89/100

Opponents

Opposition and rivalries

The strongest recorded win, rematches and opponents faced repeatedly.

Rematches 3–3 3–3 across 6 rematches against 3 repeat opponents.

Top 10 highest-ranked defeated opponents

Past 12 months

  1. #1235 Vojtěch Kotula · TATAMY 16 KIDS (No-GI and GI round robin) Sub 03:08 0–-2 Earlier · Dec 0–0 September 20, 2025 · TATAMY 16 KIDS (No-GI and GI round robin)
  2. #1476 Tobiáš Podroužek · TATAMY 17 KIDS (No-GI and GI round robin) Sub 02:50 0–0
  3. #2155 Michal Studnica · TATAMY 18 KIDS (No-GI and GI round robin) Sub 03:24 0–0
  4. #2728 Felix Lebeda · TATAMY 19: Czech Open Championship (kids) Sub 02:59 9–2
  5. #2790 Andrej Scharringer · TATAMY 19: Czech Open Championship (kids) Sub 00:54 0–0
  6. #3042 Sebastian Sitsch · TATAMY 16 KIDS (No-GI and GI round robin) Sub 00:27 0–0

Full career

  1. #1235 Vojtěch Kotula · TATAMY 16 KIDS (No-GI and GI round robin) Sub 03:08 0–-2 Earlier · Dec 0–0 September 20, 2025 · TATAMY 16 KIDS (No-GI and GI round robin)
  2. #1476 Tobiáš Podroužek · TATAMY 17 KIDS (No-GI and GI round robin) Sub 02:50 0–0
  3. #2155 Michal Studnica · TATAMY 18 KIDS (No-GI and GI round robin) Sub 03:24 0–0
  4. #2728 Felix Lebeda · TATAMY 19: Czech Open Championship (kids) Sub 02:59 9–2
  5. #2790 Andrej Scharringer · TATAMY 19: Czech Open Championship (kids) Sub 00:54 0–0
  6. #3042 Sebastian Sitsch · TATAMY 16 KIDS (No-GI and GI round robin) Sub 00:27 0–0

Rivals

Opponent Head-to-head record Matches
Vojtěch Kotula 2–0 2
Šimon Dyntar 0–2 2

Around this athlete

Athlete Rank Rating
Mattia Romeo #877 1,394
Samuel Kulak #878 1,393
Maksym Dobei #879 1,393

Recent tournaments

  1. TATAMY 20: PRAGUE - KIDS (round robin)

    March 21, 2026
    Gi 0–0

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 1,393

Rating-period composition

Rating matches
15 0
Record
10–5 Previous month 10–5
Opponents
13 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 -1 Rating 1,393

Rating-period composition

Rating matches
15 0
Record
10–5 Previous month 10–5
Opponents
13 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 Change -1 Rating 1,394

Rating-period composition

Rating matches
15 0
Record
10–5 Previous month 10–5
Opponents
13 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.

May 2026 No new matches · 2 left period Change -2 Rating 1,395

Rating-period composition

Rating matches
15 -2
Record
10–5 Previous month 11–6
Opponents
13 -1
Events
4 -1

2 older matches left the 12-month period: 1 won and 1 lost. The rating is then recalculated across the full network, so the monthly change is not a sum of separate deductions.

April 2026 No new matches Change +6 Rating 1,397

Rating-period composition

Rating matches
17 0
Record
11–6 Previous month 11–6
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.

March 2026 No new matches Change -10 Rating 1,391

Rating-period composition

Rating matches
17 0
Record
11–6 Previous month 11–6
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.

February 2026 2 new matches · 2 left period Change +45 Rating 1,401

Rating-period composition

Rating matches
17 0
Record
11–6 Previous month 9–8
Opponents
14 0
Events
5 0

2 older matches left the 12-month period: 0 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
February 21, 2026 Felix Lebeda
TATAMY 19: Czech Open Championship (kids) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 02:59 9–2
Marginal influence +14
Win
February 21, 2026 Andrej Scharringer
TATAMY 19: Czech Open Championship (kids) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 00:54 0–0
Marginal influence +13
January 2026 No new matches Change -1 Rating 1,356

Rating-period composition

Rating matches
17 0
Record
9–8 Previous month 9–8
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.

December 2025 5 new matches Change +58 Rating 1,357

Rating-period composition

Rating matches
17 +5
Record
9–8 Previous month 6–6
Opponents
14 +4
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.
Win
December 6, 2025 Jindrich Konecny
TATAMY 18 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Points 04:00 4–0
Marginal influence +14
Loss
December 6, 2025 Sergei Chernyaev
TATAMY 18 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 03:15 0–0
Marginal influence -19
Win
December 6, 2025 Michal Studnica
TATAMY 18 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 03:24 0–0
Marginal influence +12
Win
December 6, 2025 Matyas Ursacher
TATAMY 18 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 01:29 0–0
Marginal influence +12
Loss
December 6, 2025 Jindrich Konecny
TATAMY 18 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 05:41 0–4
Marginal influence -13
November 2025 3 new matches Change +7 Rating 1,299

Rating-period composition

Rating matches
12 +3
Record
6–6 Previous month 5–4
Opponents
10 +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.
Win
November 1, 2025 Tobiáš Podroužek
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -50 kg
Method Submission 02:50 0–0
Marginal influence +18
Loss
November 1, 2025 Adam Lichý
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -50 kg
Method Points 04:00 -1–0
Marginal influence -21
Loss
November 1, 2025 Šimon Dyntar
TATAMY 17 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -50 kg
Method Points 04:00 0–3
Marginal influence -28
October 2025 No new matches Change +5 Rating 1,292

Rating-period composition

Rating matches
9 0
Record
5–4 Previous month 5–4
Opponents
8 0
Events
3 0

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

September 2025 5 new matches Change +114 Rating 1,287

Rating-period composition

Rating matches
9 +5
Record
5–4 Previous month 1–3
Opponents
8 +4
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
September 20, 2025 Vojtěch Kotula
TATAMY 16 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 03:08 0–-2
Marginal influence +12
Win
September 20, 2025 Vojtěch Kotula
TATAMY 16 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Decision 04:00 0–0
Marginal influence +12
Win
September 20, 2025 Sebastian Sitsch
TATAMY 16 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 00:27 0–0
Marginal influence +7
Win
September 20, 2025 Vratko Pjontek
TATAMY 16 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 02:43 0–0
Marginal influence +9
Loss
September 20, 2025 Michal Sobota
TATAMY 16 KIDS (No-GI and GI round robin) Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
Method Submission 00:24 0–0
Marginal influence -14
Relevant matches
9.9
Official ranking percentile
Top 29%
Performance
10.4 pp above expectation

9.9 weighted matches against 13 different opponents across 4 events

Weighted win rate
66.2%
Expected win rate
55.8%
Average opponent rating
1,279
Repeated-opponent share
13.3%
Network connectivity
80.9%

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 1 event vote Selected outcome

Registrations and outcomes

TATAMY 20: PRAGUE - KIDS (round robin)
Does not count
Kids / Gi / 15-18 years / Boys / White/grey belt / -60 kg
  • Competition age 15
TATAMY 19: Czech Open Championship (kids)
U16 · Counts
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Competition age 15
TATAMY 18 KIDS (No-GI and GI round robin)
Does not count
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Competition age 14
TATAMY 17 KIDS (No-GI and GI round robin)
Does not count
Kids / Gi / 13-14 years / Boys / White/grey belt / -50 kg
  • Competition age 14
TATAMY 16 KIDS (No-GI and GI round robin)
Does not count
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Competition age 14

Classification evidence

Why ≤ 50 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

  • ≤ 50 kg 1 competition event Selected outcome
  • ≤ 55 kg 2 competition events

Registrations and outcomes

TATAMY 20: PRAGUE - KIDS (round robin)
Does not count
Kids / Gi / 15-18 years / Boys / White/grey belt / -60 kg
  • Registered weight class: -60 kg
  • Source competition limit: -60 kg

No matches in the rating period · no valid weight evidence

TATAMY 19: Czech Open Championship (kids)
≤ 55 kg · Counts as a competition event
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Registered weight class: -55 kg
  • Source competition limit: -55 kg

2 matches in the rating period

TATAMY 18 KIDS (No-GI and GI round robin)
≤ 55 kg · Counts as a competition event
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Registered weight class: -55 kg
  • Source competition limit: -55 kg

5 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
≤ 50 kg · Counts as a competition event
Kids / Gi / 13-14 years / Boys / White/grey belt / -50 kg
  • Registered weight class: -50 kg
  • Source competition limit: -50 kg

3 matches in the rating period

TATAMY 16 KIDS (No-GI and GI round robin)
≤ 55 kg · Does not count
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Registered weight class: -55 kg
  • Source competition limit: -55 kg

5 matches in the rating period · outside the three most recent unambiguous events

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 15 matches in the rating period Selected outcome

Registrations and outcomes

TATAMY 19: Czech Open Championship (kids)
grey · Counts as a match
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Source belt category: grey

2 matches in the rating period

TATAMY 18 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Source belt category: grey

5 matches in the rating period

TATAMY 17 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 13-14 years / Boys / White/grey belt / -50 kg
  • Source belt category: grey

3 matches in the rating period

TATAMY 16 KIDS (No-GI and GI round robin)
grey · Counts as a match
Kids / Gi / 13-14 years / Boys / White/grey belt / -55 kg
  • Source belt category: grey

5 matches in the rating period