| How do you get cover against someone that is adjacent to you?
Remember that you determine cover the following way:
1. The attacker chooses a corner of his square.
2. The defender chooses a corner of his square.
3. If the line between points (1) and (2) crosses a barrier, the target has cover.
If the attacker is adjacent to the defender, this means one of the attacker's corners is coincident with one of the defender's corners. So the attacker can choose that corner, and whichever corner the defender chooses, the line is completely in the defender's space, so there is no cover. | 
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