Chris J Davis
Overtext pending moderation...
I understood it. This question is not about that.
If I did not use the SUPERIOR NAVIGATION, I can't pass through Black hole. So, Black hole's move cost is not exist. (It is not written move cost at data core board. Only "X".) Even if the move cost is reduced 1, I can not know what the original move costs. So I can not be calculated.
The card causes the cost to change TO 1, not reduce BY 1. So the cost to cross a black hole using this card is 1.