Someone who plays chessers without feeling guilt.
"Three ChessersPlayers and three missionaries are trying to cross the river. They have a boat which will hold two people. However, if a missionary is ever left alone with two or more ChessersPlayers, he will be converted and start playing ChesSers..."
But you need 4 people to play ChesSers . . .
Exactly. Three ChessersPlayers and the missionary make four ChesSers players.