CT's may not advance further down the long corridor from the spawn bombsite than the intersection with the library and T-Rex corridors.
CT's may not go to the T spawn side of the library.
CT's may not go up the stairway leading from the T-Rex room towards T spawn.
CT's may not go through the door leading from the T-Rex room under the balcony.
All rules are off once the bomb has been planted.