private void a1_Click(object sender, EventArgs e)
        {
            if (global.board[0, 0] == 0 || global.finished == false)
            {
                global.board[0, 0] = 1;
                global.a1clicked = true;
                a1.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Cross.png");
                global.playermoves++;
                if (!(global.playermoves == 5))
                {
                    do
                    {
                        global.value1 = rnd.Next(0, 3);
                        global.value2 = rnd.Next(0, 3);
                        if (global.board[global.value1, global.value2] == 0)
                        {
                            global.board[global.value1, global.value2] = 2;
                            if (global.value1 == 0 && global.value2 == 0)
                            {
                                a1.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 0 && global.value2 == 1)
                            {
                                a2.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 0 && global.value2 == 2)
                            {
                                a3.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 1 && global.value2 == 0)
                            {
                                b1.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 1 && global.value2 == 1)
                            {
                                b2.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 1 && global.value2 == 2)
                            {
                                b3.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 2 && global.value2 == 0)
                            {
                                c1.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 2 && global.value2 == 1)
                            {
                                c2.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                            if (global.value1 == 2 && global.value2 == 2)
                            {
                                c3.Image = Image.FromFile("C:\\Users\\saira\\Documents\\Summer Project 2023\\TicTacToe Visual (Medium) Summer Project\\TicTacToe Visual (Medium) Summer Project\\Resources\\Nought.png");
                                global.valid = true;
                            }
                        }
                    } while (global.valid == false);
                    global.valid = false;
                }
            }
        }