public void Shift(int position)
{
int x, y;
PositionToCoordinates(position, out x, out y);
if (Math.Abs(x0 - x) + Math.Abs(y0 - y) != 1)
{
return;
}
field[x0, y0] = field[x, y];
field[x, y] = 0;
x0 = x;
y0 = y;
counter++;
moves++;
GameMemento state = new GameMemento(field, x0, y0, counter);
gameCaretaker.Save(state);
}
