We already have a released open sourced P2P poker system that's fully operational and ready to play called pokerth_accounting as seen here https://github.com/sacarlson/pokerth_accounting/wiki. It's based on the fast Stellar.org system for uncentralized real asset transactions that enable real time play, and all for free.  You can also check out the demo video's https://github.com/sacarlson/pokerth_accounting/wiki/Demonstration-Videos-of-Pokerth_Accounting