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The only general AI fix in the code I remember is a bugfix to aliens sometimes deciding to do nothing at all. No good shot, no better cover, so they do nothing. In X:CE, they'll still take a low-chances shot if there's nothing else to do. X:CE fixes alien pathing with regards to doors, they don't get stuck in buildings or UFO sections and can actually open doors when they want to. Vanilla is unreliable in these terms. Aliens understand splash damage in X:CE. In vanilla, their accuracy calculation only considers whether they miss, or score a direct hit. In X:CE, they understand that splash weapons still do damage with a close miss. And one specific AI fix is Wraith teleportation. In vanilla, Wraiths do not teleport beyond how far they can run, and generally often display dumb teleportation behaviour, like going somewhere where they are easily killed. X:CE Wraiths understand the concept of teleporting to safety, behind some cover, and also of teleporting behind your soldiers to do an ambush. Except for the Wraith fix, the others are just corner cases. One of those fixes will maybe come into play one out of ten combat missions.