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Use cases to cover

• Tie.
• Row win.
• Column win.
• Diagonal win.

Choose the board's dimensions

Accept only integers from 2 to 20.

• Otherwise, it may complicate or even crash the system to display for example 100000x100000 board.
• To play 100000x100000 board might be a nightmare.

Allow setting game's board dimensions only once - before starting it.

• Otherwise it would be too much fun when suddenly one player changes again board dimensions.

Choose the select cell count to win

• Allow setting only once - before starting it.
• Keep it in the board's dimensions.

Select the cell

• Can select cells only when the game has started ('ongoing' status).
• Allow selecting the cell only once.
• Keep it in the board's dimensions.

If this is the last move

• Check for a tie or a win.
• Inform the user and then provide the input to start a new game.