Design a Connect-Four-like board game

Q: Design a Connect-Four-like board game

This question evaluates object-oriented design, modularity, extensibility, and testability in modeling a turn-based, grid-based drop-token game, and is categorized under Software Engineering Fundamentals; it requires both conceptual architecture and practical application thinking.

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Question

Design an object-oriented model for a turn-based, grid-based “drop token” board game similar to Connect Four.

Game rules (define these precisely in your design):

The board has rows and cols .
Players alternate turns.
A move chooses a column; the token falls to the lowest available row in that column.
If a column is full, the move is invalid.
A player wins by forming K consecutive tokens in a line (horizontal, vertical, or diagonal).
The game ends when someone wins or the board is full (draw).

Requirements:

Provide class/interface design (e.g., Game , Board , Player , Move , Rules/WinCondition ).
Show key methods and responsibilities (no need for full code, but be concrete).
Make it easy to extend (e.g., different win conditions, different gravity direction, or different board sizes).
Discuss how you would test the win-checking logic and move validation.

Design a Connect-Four-like board game

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