Tic-Tac-Toe 

Tic-Tac-Toe is a simple two-player game, traditionally with its marks as X and O. Each player places his/her mark in a space and alternate turns in a 3×3 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game.

This is what the pen and pencil game board looks like. In the following illustration, the player with the X marker is the winner:

Requirement specifications

In this chapter, we will create a two-player Tic-Tac-Toe game with the following basic requirements:

1. As a player, I should be able to register with my name and display a picture
2. As a player, I should be able to find an opponent, that is, the second player to play against
3. The...