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Of course... Sorry my english, what is NAPs?

Yggdrasill in Diplomacy:

Hi there

Is fixing a borderline and negotiate NAPs allowed in this game?

Ygg

No it is not. It is a free for all game. Every has to suspect his neighbours as enemies.

No-aggression-pacts are diplomacy and they alter local powers and allow players to weaken their borders for the benefit of attacking on another.

But this is exactly the higher difficulty in no ally games. NAP is some kind of alliance and those are not allowed.