public bool MoveRight(Field field, out SearchNode sn)
{
Vector2Int newPos = mino.position;
Mino tmp = mino.Clone();
bool ok = false; //是否不能再往右了
newPos.x++;
if (field.IsValid(mino, newPos))
{
tmp.Move(1);
ok = true;
}
sn = new SearchNode(tmp, op + "r");
return(ok);
}