Aye. There's been lots of past issues with crews coming in and using their own crooked judges in their own crooked tournaments, and sometimes even homegrown judges may be rather biased, so I'd recommend a set of three judges, one who knows neither party, and one from each player's 'camp', so to speak. 

If you doubt a judge's neutrality, check their history. Keep a record of what actions take place during your fights, and try to stick to techniques with references. If you can't describe a move well, don't describe it at all. If you play your cards right you won't get the wrong end of the stick when you eventually run into someone dishonest.