_Quaterne_ is an adaptation of the board game Connect Four. It can be played
by two human players or by one player against an AI opponent. The game board
consists of fifteen columns that the players drop checkers into by typing in
the corresponding number. To win the game a player needs to get four checkers
in a line, either horizontally, vertically or diagonally. When playing against
the AI, the game has a built-in advice system and will at any time show the
best next three moves.