You're better off using Ethereum to keep records of matches and leave computing the results to computers that don't charge per opcode. It's fairly expensive now

You're better off using Ethereum to keep records of matches and leave computing the results to computers that don't charge per opcode. It's fairly expensive now, but that could be reasonably priced in a couple years with plans to change up Ethereum's architecture to a tree of progressively lighter-weight blockchains (Sharding).