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UNDERHOOK SOCIETY

Leiden, Netherlands44 members, 43 on BeltcheckerSince 2023
2,008 profile views
#88worldwide by verification points of confirmed members
Top 32%
Black belts
2 black belts
Top 37%
Competition medals
21 medals

About

Administrator(s)

Iwan Hansen
Iwan
Mike Harteveld
Mike

Most training sessions logged

1
Dennis De Booij
350
2
Iustin Raducanu
Iustin Raducanu
White belt
191
3
David
David
Purple belt
49
4
Zheyu Shang
Zheyu Shang
Blue belt
20
5
Mariëtte Bonestroo
6
6
Carlos Arranz
Carlos Arranz
Blue belt
4

Most sparring rounds logged

1
Dennis De Booij
1,120
2
Iustin Raducanu
Iustin Raducanu
White belt
857
3
David
David
Purple belt
56
4
Zheyu Shang
Zheyu Shang
Blue belt
36
5
Mariëtte Bonestroo
21
6
Carlos Arranz
Carlos Arranz
Blue belt
14

Training time

1
Iwan Hansen
Iwan Hansen
Black belt 1st degree
16y, 1m
2
Remco Bakker
Remco Bakker
Blue belt
7y, 9m
3
David
David
Purple belt
7y, 8m
4
Mariëtte Bonestroo
7y, 7m
5
Mike Harteveld
Mike Harteveld
Black belt
7y, 2m
6
Janna Stolk
Janna Stolk
Purple belt
5y, 9m
7
Vincent Mulder
Vincent Mulder
Purple belt
4y, 3m
8
Hilda Vos
Hilda Vos
Blue belt
3y, 2m
9
Dennis De Booij
3y, 1m
10
Egbert Koops
Egbert Koops
White belt
3y, 1m
Total: 112 years and 8 months

Time since last promotion

1
Remco Bakker
Remco Bakker
Blue belt
3y, 9m
2
Egbert Koops
Egbert Koops
White belt
3y, 1m
3
Karin
Karin
White belt
2y, 11m
4
Janna Stolk
Janna Stolk
Purple belt
2y, 5m
5
Iustin Raducanu
Iustin Raducanu
White belt
2y, 2m
6
Ramiro Genta
Ramiro Genta
White belt
2y, 1m
7
Lisa Ducher
Lisa Ducher
Blue belt
1y, 11m
8
David
David
Purple belt
1y, 11m
9
Hilda Vos
Hilda Vos
Blue belt
1y, 11m
10
Mariëtte Bonestroo
1y, 11m
18,850
Total academy points
From its verified members
Confirmed members per academy
Bigger than 96% of academies
43 members
96% of academies
155
Members by belt
43 confirmed members · 5% black belts
20
16
5
2
White47%20
Blue37%16
Purple12%5
Black5%2

Visitors

1 guest has trained here

Schedule

5 classes a week
MonMonday
No classes
TueTuesday
17:00 to 18:30Grappling Bjj Leiden
Iwan Hansen
Iwan Hansen
WedWednesday
17:30 to 19:00Brazilian Jiu Jitsu All Levels Leiden.
Iwan Hansen
Iwan Hansen
ThuThursday
No classes
FriFriday
18:00 to 19:45Grappling Bjj Leiden
Iwan Hansen
Iwan Hansen
1
SatSaturday
No classes
SunSundayToday
09:30 to 11:00Brazilian Jiu Jitsu (fundamental) Leiden
Iwan Hansen
Iwan Hansen
1
11:00 to 12:00Woman's only BJJ & Grappling
Iwan Hansen
Iwan Hansen
Learn Brazilian jiu jitsu and grappling in a safe, supportive and fun environment. All levels welcome, no experience needed.

Times are local to the academy (Europe/Amsterdam).

Gallery

Average time spent at each belt (verified profiles only)

UNDERHOOK SOCIETYWORLD AVERAGE
1 year(s), 10 month(s), 26 day(s)2 year(s), 3 month(s), 29 day(s)
2 year(s), 6 month(s), 13 day(s)3 year(s), 9 month(s), 14 day(s)
1 year(s), 4 month(s), 9 day(s)2 year(s), 11 month(s), 28 day(s)
2 year(s), 2 month(s), 7 day(s)3 year(s), 0 month(s), 12 day(s)

Competition record

25
Wins
12
Losses
68%
Win rate
Giacomo Franceschi
Giacomo Franceschi
vs Vincent Degenhart
GrappleCity: Rotterdam Summer OpenAdult Nogi / Beginner (White) / Adult / -91kg / MenPoints (2-0)
WinMay 23
Giacomo Franceschi
Giacomo Franceschi
vs Dokka Agamerzaev
GrappleCity: Rotterdam Summer OpenAdult Nogi / Beginner (White) / Adult / -91kg / MenPoints (8-2)
WinMay 23
Giacomo Franceschi
Giacomo Franceschi
vs Elias Forestier-Depresle
GrappleCity: Rotterdam Summer OpenAdult Gi / Adult / White / -91kg / MenSubmission (leg triangle from guard - 02:30)
WinMay 23
Giacomo Franceschi
Giacomo Franceschi
vs Noë van Leeuwen
GrappleCity: Rotterdam Summer OpenAdult Gi / Adult / White / -91kg / MenPoints (9-0)
WinMay 23
Giacomo Franceschi
Giacomo Franceschi
vs Suleyman Ozevci
VERSUS Championship 34 - Gi & NoGiNovice -91APoints (0-6)
LossApr 6
Giacomo Franceschi
Giacomo Franceschi
vs Bjarne Vranckx
VERSUS Championship 34 - Gi & NoGiNovice -91APoints (4-3)
WinApr 6
Giacomo Franceschi
Giacomo Franceschi
vs Tomáš Koneček
VERSUS Championship 34 - Gi & NoGiNovice -91ASubmission (Ezekiel choke from mount - 02:53)
WinApr 6
Giacomo Franceschi
Giacomo Franceschi
vs Omar Waziri
VERSUS Championship 34 - Gi & NoGiNovice -91APoints (0-3)
LossApr 6
Giacomo Franceschi
Giacomo Franceschi
vs Oleksandr Monastyrov
VERSUS Championship 34 - Gi & NoGiGi / Novice -91Submission (Ezekiel choke from mount - 00:57)
WinApr 6
Giacomo Franceschi
Giacomo Franceschi
vs Sivar Sdiq
VERSUS Championship 34 - Gi & NoGiGi / Novice -91Points (4-4) x1 Advantage
WinApr 6
Giacomo Franceschi
Giacomo Franceschi
vs Demian Koopman
Underhook Wars (1st Edition)Male Gi / Adult / +80 kgPoints (0-5)
LossFeb 1
Giacomo Franceschi
Giacomo Franceschi
vs Luuk Zwaan
Underhook Wars (1st Edition)Male Gi / Adult / +80 kgDecision (8-8)
LossFeb 1
Giacomo Franceschi
Giacomo Franceschi
vs Cas Heemskerk
Underhook Wars (1st Edition)Male Gi / Adult / +80 kgSubmission (rear naked choke - 01:30)
WinFeb 1
Giacomo Franceschi
Giacomo Franceschi
vs Demian Koopman
Underhook Wars (1st Edition)Male Gi / Adult / +80 kgPoints (0-7)
LossFeb 1
Giacomo Franceschi
Giacomo Franceschi
vs Gabriel Behr
Underhook Wars (1st Edition)Male Gi / Adult / +80 kgSubmission (triangle arm-bar - 01:30)
WinFeb 1
Giacomo Franceschi
Giacomo Franceschi
vs António Santos
Underhook Wars (1st Edition)Male Gi / Adult / +80 kgSubmission (Americana from mount - 02:00)
WinFeb 1
Giacomo Franceschi
Giacomo Franceschi
vs Esat Unal
VERSUS Championship 33 - NoGi & Adults onlyNovice -91 / ESubmission (D'Arce choke - 01:21)
WinJan 25
Giacomo Franceschi
Giacomo Franceschi
vs Selimcan Kucukalioglu
VERSUS Championship 33 - NoGi & Adults onlyNovice -91 / EPoints (3-5)
LossJan 25
Giacomo Franceschi
Giacomo Franceschi
vs Casper van der Heijden
VERSUS Championship 33 - NoGi & Adults onlyNovice -91 / EPoints (4-1)
WinJan 25
Giacomo Franceschi
Giacomo Franceschi
vs Aidan de Groeve
VERSUS Championship 33 - NoGi & Adults onlyNovice -91 / EPoints (5-0)
WinJan 25
Giacomo Franceschi
Giacomo Franceschi
vs Adil Bellah
BJJ Dutch Open 2025Adult Male (16+ years) / White belt / -94,3 kgPoints (0-3)
LossDec 2025
Giacomo Franceschi
Giacomo Franceschi
vs Suleyman Ozevci
VERSUS Championship 32 Gi & NoGiNo-Gi Novice / -91CPoints (2-1)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Jasper Witteck
VERSUS Championship 32 Gi & NoGiNo-Gi Novice / -91CSubmission (Ezekiel choke from mount - 02:30)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Luiz Rosiers
VERSUS Championship 32 Gi & NoGiNo-Gi Novice / -91CPoints (5-2)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Korang Adu Yeboah
VERSUS Championship 32 Gi & NoGiMale Gi / White (Novice) / -91Points (10-0)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Elias Bergsma
VERSUS Championship 32 Gi & NoGiMale Gi / White (Novice) / -91Submission (Ezekiel choke from mount - 01:24)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Niels Vanderhoven
VERSUS Championship 32 Gi & NoGiMale Gi / White (Novice) / -91Submission (Ezekiel choke from mount - 03:00)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Christian Timmermans
VERSUS Championship 32 Gi & NoGiMale Gi / White (Novice) / -91Decision (0-0)
WinNov 2025
Giacomo Franceschi
Giacomo Franceschi
vs Dilivio Daal
2025 NO GI International Veluwe Open Jiu Jitsu ChampionshipMale No-gi / White belts 6 + months experience / Adult / Male Open Weight White belts (Bronze Match)Submission (guillotine from North-South - 04:38)
LossOct 2025
Giacomo Franceschi
Giacomo Franceschi
vs Kursat Koca
2025 NO GI International Veluwe Open Jiu Jitsu ChampionshipMale No-gi / White belts 6 + months experience / Adult / Male Open Weight White beltsPoints (0-6)
LossOct 2025
Giacomo Franceschi
Giacomo Franceschi
vs Kyan Doremalen
2025 NO GI International Veluwe Open Jiu Jitsu ChampionshipMale No-gi / White belts 6 + months experience / Adult / Male Open Weight White beltsPoints (0-22)
WinOct 2025
Giacomo Franceschi
Giacomo Franceschi
vs Taeke Hendriks
2025 NO GI International Veluwe Open Jiu Jitsu ChampionshipMale No-gi / White belts 0-6 months experience / Adult / -94,3 kg (Heavy)Points (2-8)
LossOct 2025
Giacomo Franceschi
Giacomo Franceschi
vs Kubilay Yilmaz
2025 NO GI International Veluwe Open Jiu Jitsu ChampionshipMale No-gi / White belts 0-6 months experience / Adult / -94,3 kg (Heavy)Submission (Ezekiel choke from mount - 04:34)
WinOct 2025
Iustin Raducanu
Iustin Raducanu
vs Jamin Xie
GNSK 2025 (No Gi)Men's White & Blue Belt -77kgPoints (15 - 4)
LossJun 2025
Iustin Raducanu
Iustin Raducanu
vs Txai Van der Meer
GNSK 2025 (No Gi)Men's White & Blue Belt -77kgPoints (8 - 0)
WinJun 2025
Iustin Raducanu
Iustin Raducanu
vs Yusuke Katayama
GNSK 2025 (No Gi)Men's White & Blue Belt -77kgPoints (2 - 0)
WinJun 2025
Iwan Hansen
Iwan Hansen
vs Quintin Voleppe
flanders bjj cup 2018Men Elite -88,3 (Medium Heavy)
LossJan 2018

Competition medals

13
Gold
5
Silver
3
Bronze
Vincent Mulder
Vincent Mulder
ADCC Iberian Open 2026Master Intermediate
GoldMay 30
Giacomo Franceschi
Giacomo Franceschi
GrappleCity: Rotterdam Summer OpenAdult Nogi / Beginner (White) / Adult / -91kg / Men
GoldMay 23
Giacomo Franceschi
Giacomo Franceschi
GrappleCity: Rotterdam Summer OpenAdult Gi / Adult / White / -91kg / Men
GoldMay 23
Giacomo Franceschi
Giacomo Franceschi
VERSUS Championship 34 - Gi & NoGiNovice -91A
SilverApr 6
Giacomo Franceschi
Giacomo Franceschi
VERSUS Championship 34 - Gi & NoGiGi / Novice -91
GoldApr 6
Giacomo Franceschi
Giacomo Franceschi
VERSUS Championship 33 - NoGi & Adults onlyNovice -91 / E
SilverJan 25
Vincent Mulder
Vincent Mulder
IBJJF European Championship 2026Masters 3
SilverJan 15
Vincent Mulder
Vincent Mulder
BJJ Dutch Open 2025Masters 40+
BronzeDec 2025
Vincent Mulder
Vincent Mulder
VIII Taça BJJ Pinhal Novo 2025Masters 2
BronzeNov 2025
Giacomo Franceschi
Giacomo Franceschi
VERSUS Championship 32 Gi & NoGiNo-Gi Novice / -91C
GoldNov 2025
Giacomo Franceschi
Giacomo Franceschi
VERSUS Championship 32 Gi & NoGiMale Gi / White (Novice) / -91
GoldNov 2025
Giacomo Franceschi
Giacomo Franceschi
2025 NO GI International Veluwe Open Jiu Jitsu ChampionshipMale No-gi / White belts 0-6 months experience / Adult / -94,3 kg (Heavy)
GoldOct 2025
Vincent Mulder
Vincent Mulder
IV Torneio de Jiu-jitsu São Domingos 2025Masters 3
GoldSep 2025
Pieter Matthee
Pieter Matthee
Groot Nederlands Studenten KampioenschapUltra Heavyweight
GoldJun 2025
Pieter Matthee
Pieter Matthee
Groot Nederlands Studenten KampioenschapUltra Heavyweight / 100,5kg+
GoldJun 2025
Vincent Mulder
Vincent Mulder
MSC Championship Open Jiu-Jitsu 1st Edition 2025Masters 3
GoldFeb 2025
Vincent Mulder
Vincent Mulder
VII Taça BJJ do Pinhal Novo 2024Ultra Heavy Masters 3
GoldNov 2024
Iwan Hansen
Iwan Hansen
Primal Games-88
SilverDec 2018
Iwan Hansen
Iwan Hansen
Dutch Open 2017BlueBelt heavy -94,3
GoldOct 2017
Vincent Mulder
Vincent Mulder
Rotterdam Grappling TournamentBeginner, Whitebelt
BronzeJun 2013
Vincent Mulder
Vincent Mulder
Grappling Ede-100kg, Beginner
SilverMay 2010
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