simple combos can be very effective... if you get mad just striking can be effective. thats what i saw in finnish open junior jujutsu competitions. Brown belt Jujutsuka versus yellow belt jujutsuka. The yellow belt jujutsuka throwed a roundhouse kick on the brown belters tummy, in a second you could see the brown belters rage he hit six times on yellow belters tummy. and the yellow belter fell on his *. Match over we had a winner.