All Fours is a trick-taking card game, usually played with four players in two-player partnerships, that dates from around the 17th century. There are many rules variations, but the version implemented on Board Game Area as Caribbean All Fours is meant to be an adaptation of the modern game as it is played in Trinidad and Tobago.
The game plays as described in the "Rules of Card Games" website under the heading "All Fours in Trinidad": link, with the following differences:
- No misdeal: since the game software deals the cards, there is no possibility for a misdeal, no points can be scored for this scenario
- No revoking/reneging: for simplicity of online gameplay, playing cards illegally is not allowed, and therefore revoking is not necessary
The only variation implemented at this time is the alternate trump scoring as played in Tobago (a Two scores two points when turned instead of a Six)