Controversial issues and their resolutions.

When approaching a shifted guard, the player often cannot determine whether there was a double guard here before, which the opponent might have broken through.

If there are multiple guards between zones, it is sufficient to break through only one of them. If one of the players has already broken through one of the guards of a zone, and the second player sees this, then the second player does not need to break through the other guard and can go to another zone. Otherwise, the second player must break through one of the guards of this zone.