mirrorHorizontal method
If the row is less than or equal to 2, then mirror the piece horizontally up to down. Otherwise, mirror the piece horizontally down to up
Returns: A boolean value.
Implementation
bool mirrorHorizontal() {
// if (move.row <= 2) {
// return mirrorHorizontalUpDown();
// }
mirrorHorizontalUpDown();
return mirrorHorizontalDownUp();
}