A MAN attacked a restaurant worker who he claimed had caused a leg injury during a football match, and demanded $20,000 compensation, the District Court was told yesterday. So Ma-fook, 24, claimed he was fouled during a football match by Tsang Chui-man, 22, who had then agreed to compensate him for the injury. But Mr Tsang denied fouling So and said he only agreed to pay the cash because he wanted the defendant to stop pestering him. So was yesterday found guilty on two charges of robbery and one charge of blackmail by Judge Tyler. On July 16 last year So waited for Mr Tsang when he finished work at the Fairwood Fast Food Restaurant in Tai Po. When Mr Tsang refused to hand over any cash, So punched him in the chest and grabbed his hair. Mr Tsang then gave the defendant $100 and some gold jewellery before So frog-marched him to a bank and forced him to withdraw $5,000 and hand that over. The next day, So turned up at the restaurant and demanded $20,000 from Mr Tsang, claiming it was for medical fees for the alleged leg injury. So said that if Mr Tsang failed to produce the cash he would be attacked. The victim alerted the police, who then arrested So. The defendant claimed there was no robbery and that Mr Tsang agreed to pay him compensation. But Judge Tyler said: ''The victim denied ever injuring the defendant's leg in a football match and he had never agreed to pay him the money.'' The judge added that on the day of the robbery Mr Tsang only agreed because he wanted to get rid of the defendant. So, who had denied the charges, was remanded in custody for reports before sentencing later this month. Bail was refused.