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CHECKMAT ​is an international academy, competition team, and family of Brazilian Jiu-Jitsu (BJJ) practitioners. Founded in 2008 by Master Vieira, Checkmat now has affiliate academies in thirty-four American cities and sixteen countries worldwide. The team is headquartered in Signal Hill-Long Beach, California (USA), which regularly hosts “The Mundials,” the world championships of BJJ.

At Checkmat, you will find world-class, hands-on instruction that has been tested on the practice mats and proven on the competition field. Checkmat men, women, and youth have won some of the most prestigious tournaments in the sport including the World Championships, the Brazilian National Championships, and the Abu Dhabi Combat Club (ADCC) Submission Wrestling World Championships. Checkmat’s success comes from the steady leadership and instruction of Master Leo Vieira, a 5th degree BJJ black belt and Judo black belt. Nicknamed “Leozinho” or “Little Lion” he is known—uniquely—as both one of the finest jiu-jitsu competitors of his generation (2X World Champion, 2X ADCC winner) and also as a pioneering coach and instructor. Master Leo sees both the art and science within BJJ, emphasizing technical prowess and invention while also strongly believing in the dynamic expression and individuality of each practitioner.

In any given month, you can find Master Leo teaching a world champion, a Sheikh, a prince, a police officer, a nurse, a college student, an elementary school student, or a beginner on her or his first day all with the same kindness, interest, and passion. Why? Because Checkmat is about more than winning trophies and medals, it is focused on inspiring a healthy and positive individual who goes on to create a healthy and positive community.

Together, we are stronger. Together, we are better. Together, we are Checkmat.


Kids Jiu-Jitsu Brentwood, Kids BJJ Brentwood, Kids Martial Arts Brentwood, Kids jiujitsu

Kid’s Jiu-Jitsu is a martial art, combat sport, and a self-defense system that focuses on grappling and ground fighting. Jiu-Jitsu promotes the concept that a smaller, weaker person can successfully defend against a bigger, stronger assailant by using leverage and proper technique, taking the fight to the ground.

Our program places a strong emphasis in physical, mental, and spiritual development for the purposes of self-defense and personal growth. In addition, we have an advance training program that hones the sport side of Jiu-Jitsu to prepare you for competition.

Whether you’re looking for self-defense, sport training, and or just a bit more confidence and self-esteem for your child, the kid’s Jiu-Jitsu program is a great place to start.


Many children (and some adults too!) may feel very reserved, nervous, and shy on their first day, as is the case with many new activities. There will be many new movements and positions that are completely foreign to them. It is completely natural to feel timid, but after a few minutes of instruction, participants are encouraged by the supportive environment and tend to relax. Our goal at the beginning of class is to make the warm-ups fast-paced and fun. We encourage every child join in, with or without the uniform, to get a feel for the class. Some children prefer to watch at first, which they are welcome to do. We do not require sparring or competition in the class, but most kids look forward to trying their new techniques. We end each class with fun, cooperative games, which are always a hit with the kids.

Kids Yoga Brentwood, Kids Fitness Brentwood, Kids After School Brentwood


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At the age of 8, Thiago’s mother enrolled him in a judo club in an attempt to ease off her son’s hyperactivity. The success of this experiment meant that from there on Gaia had a busy sporting life, playing football (soccer), swimming, sailing and at the age of 10 jiu-jitsu, with coach Rezende.

In the very beginning, Thiago’s motivation to start training jiu-jitsu was Price FC, particularly the performances of Antonio Rodrigo Nogueira in the ring of the famous Japanese MMA promotion.

At first, BJJ was just a game, something followed half-heartedly, but as Thiago turned 15 he started focussing more in his training and developing a taste for competition.

At the age of 16, Thiago was promoted to blue belt by coach Nelson who ran an affiliate gym of the TT academy in São Sebastião. Gaia’s desire to improve and be the best grappler he could be led him to move to the capital – São Paulo, in order to train at the TT headquarters where names such as CobrinhaEduardo TellesAndré GalvãoTererê, and Marcelo Mafra trained.

Thiago then found Leonardo Vieira and AKA Jiu-Jitsu Coach Leandro Vieira (Brasa and later Checkmat) who was Gaia’s coach throughout his formation years.

Learn from one of the best Jiu-Jitsu Teams in the World a try a class now!


Brazilian Jiu-Jitsu Titles

IBJJF World Championship

  2007: Gold

  2009: Silver

  2015 (No-Gi): Bronze

IBJJF Pan American

   2011: Silver

ADCC Brazilian Tournament

   2015: Silver

IBJJF Brazilian National

  2010: Gold

  2015 (No-Gi): Gold

IBJJF San Jose Championship

  2019: Silver (No-Gi)

IBJJF Sao Paulo Championship

  2017 (No-Gi): Gold

  Bronze: Open Class

BJJ Tour American Cup

  2019: Gold

FPJJ Paulist Championship

  2010 (No-Gi): Gold

  2013 (No-Gi): Gold

CBJJE Pan American

  2016: Gold

  Overall Team Won Silver

CBJJE World Championship

  2008: Gold

Jiu-Jitsu By the Bay

  2019: Gold

  Silver: Open Class

Fight 2 Win Championship

  2019: Champion

  Submission (Rear Naked)

  Round: 1

Fight 2 Win Championship

  2019: Champion

  Unanimous Decision

  Round: 1

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