public void F()
{
if (B1 != "")
{
int x, y;
x = Convert.ToInt32(B1.Split(' ')[0]);
y = Convert.ToInt32(B1.Split(' ')[1]);
Picture[x, y].Image = null;
}
if (B2 != "")
{
int x, y;
x = Convert.ToInt32(B2.Split(' ')[0]);
y = Convert.ToInt32(B2.Split(' ')[1]);
Picture[x, y].Image = null;
}
}