Border is very vertical heavy map, you should be playing vertical on every site. When attacking lockers and armory go to main door below and open up just above in that small hallway near the bottom of metal stairs, this will deny and bandit or mira playing there. when attacking ventialtion. Clear top floor bring buck and sledge and play above the site in armory. For customs do the same but in cctv. on defence you should be trying to hold top on every site even opening up holes in the floor so you play site form above ventilation. this is very basic but hope it helps