from typing import Tuple


def _unmerge_points(
    board_points: Tuple[int, ...]
) -> Tuple[Tuple[int, ...], Tuple[int, ...]]:
    """Return player and opponent board positions starting from their respective ace points."""
    player: Tuple[int, ...] = tuple(
        map(
            lambda n: 0 if n < 0 else n,
            board_points,
        )
    )
    opponent: Tuple[int, ...] = tuple(
        map(
            lambda n: 0 if n > 0 else -n,
            board_points[::-1],
        )
    )
    return player, opponent