Origins & Cultural Context
Connect Four became widely popular as a “quick-to-learn” strategy game in the 20th century, especially as a family game and classroom logic exercise. Its appeal is that the rules are simple, but the tactics (threats, blocks, forks) arrive quickly — and are easy to see.
Equipment & Setup
- 7×6 vertical grid
- Two colors of discs
- Pieces “fall” to the lowest available slot in a column
Objective
Be the first to connect four of your discs in a straight line.
Rules at a Glance
- On your turn: choose a column and drop one disc
- Gravity: the disc lands on the lowest empty cell in that column
- Win lines: horizontal, vertical, or diagonal
- Draw: the board fills with no winner
Teaching note: This is a great intro to scanning a grid (win detection)
and simple AI search (minimax) without needing real-time animation.
Strategy Basics
- Own the center: the middle column participates in the most winning lines.
- Threats matter: create “three-in-a-row with an open end” to force blocks.
- Forks win games: set up two threats at once so a single block can’t stop you.
- Don’t help the AI: avoid moves that give the opponent an immediate winning reply.
Play the Game
Mode: Human (Red) vs Computer (Black) • Difficulty adjustable
How to play: click a column number to drop a disc. Undo removes your move and the AI reply.
What the computer is doing
minimax • alpha-beta
• The AI simulates future moves and picks the best outcome for itself
• It assumes you will also choose strong moves (so it plans defensively)
• Higher difficulty looks further ahead (stronger, slightly slower)
• It assumes you will also choose strong moves (so it plans defensively)
• Higher difficulty looks further ahead (stronger, slightly slower)
Move log
Sources & Further Reading
Optional: add links to Connect Four strategy articles, minimax explanations, or a short note about why grid-based games are a popular teaching tool for programming.