private PictureBox[,] scacchiera = new PictureBox[8, 8];

   private void Form1_Load(object sender, EventArgs e)
        {
            bool white = true;
            int size = 40;
            for (int i = 0; i <= 7; i++)
            {
                for (int j = 0; j <= 7; j++)
                {
                    scacchiera[i, j] = new PictureBox();
                    scacchiera[i, j].Name = j + "-" + i;
                    scacchiera[i, j].Location = new Point(j * size + size, 8 * size - i * size);
                    scacchiera[i, j].Size = new Size(size, size);
                    scacchiera[i, j].BackColor = (white) ? System.Drawing.Color.White : System.Drawing.Color.Black;
                    scacchiera[i, j].Click += new EventHandler(pctQuad_Click);
                    this.Controls.Add(scacchiera[i, j]);

                    white = !white;
                }
                white = !white;
            }

        }

  private void pctQuad_Click(object sender, EventArgs e)
        {
            MessageBox.Show(((PictureBox)sender).Name);
        }