Overview
Connect Four is a two-player abstract strategy game played on a vertical board with seven columns and six rows. Players take turns dropping colored plastic discs into columns; each disc falls to the lowest available cell. The goal is to be the first to form an unbroken line of four discs of one color, horizontally, vertically or diagonally.
Rules and components
The standard set includes a yellow plastic grid, a supply of two colors of round discs and a stand so the board sits upright. On a turn a player selects a column and releases one disc; gravity determines its final position. A player wins immediately when four of their discs connect in a straight line. If the board fills without any four-in-a-row, the game is a draw.
History and development
Commercially released by a major game publisher in the 1970s, the game quickly became a staple of family and party play because of its simple rules and quick playtime. Its clear state space and discrete moves also made it attractive for recreational mathematics and early computer game research.
Strategy and analysis
Although easy to learn, Connect Four has depth: control of the center columns, creation of multiple simultaneous threats, and forced sequences are key concepts. The game has been exhaustively analyzed by computers; with perfect play the first player can force a win on the standard board. Typical human strategies include aiming for center play, playing vertically to build potential connections, and watching for opponent forks.
Variants and cultural impact
Many variants change board size, require more discs in a row, or add rules such as "pop-out" pieces. The game appears in digital form, competitive events, and educational contexts where it illustrates combinatorial game theory and algorithmic search techniques. For more information see the manufacturer and general reference pages: Connect Four.
- Winning lines: horizontal, vertical, diagonal
- Common board: 7 columns × 6 rows
- Uses: family game, teaching, AI examples