500 or Five Hundred is a trick-taking game that is an extension of Euchre with some ideas from Bridge.
- Play of hearts, diamonds, clubs, spades calls
- Computer player using Monte Carlo tree search
- Bidding
- No trumps
- Misere
- Graphical front ends (HTML5)
- Optimization of computer player
- API for competing programs
- Portable game notation derivative (probably similar to Portable Bridge Notation)