I have been playing around with an Excel Spreadsheet that was used when our club ran the Showdown for the CSFTA in March last year. We decided to do the random version by getting all those who were entering to chose a number. This number was then used to organise the competitors into pairs and which course and lane they were starting on. Once the results for each round are added in the next round is sorted out automatically. I have attached it to this (I hope ) and it does 16, 32 or 64 competitors. Feel free to use it for your own competitions.