The Russian fighting style known as 'sambo' is probably not a sport that many people have heard of. Originating in the Russian military, it's principally a cross between kick-boxing and judo, with some other martial arts elements thrown in for good measur

The word 'sambo' is an acronym of the Russian expression for ‘unarmed self-defence’. There are five different styles of the sport, which are all based on kick-boxing, judo and wrestling.

Combat sambo however is more similar to mixed fighting, which is taking the U.S. by storm. Competitors are allowed to kick and punch their opponents and a number of martial arts are used.

The bouts are each five minutes long, though injury time-outs are allowed. As in judo, there is a points-scoring system with competitors given marks for throws and holds.

The XIII Combat Sambo World Championships took place in Moscow last Friday. It saw 16 nations competing in seven weight categories ranging from 57 kilograms to the heavyweight division of over 90 kilos.

As expected, Russia dominated the tournament, taking first place in the overall team event.

One of the stars of the sport, Shamil Zubarov won his third gold medal and increased his enviable record to 151 wins with no losses. He says he's ready for a new challenge and will soon try his hand at mixed fighting.