Okay, the user is asking how to counter the "P90 rush B" tactic in CS:GO. Let me start by recalling what this tactic entails. From previous searches, I know it's a high-speed, aggressive strategy where the Terrorists (T) rush toward point B with P90 submachine guns, relying on sheer speed and volume of fire.

First, I need to consider the user's context. They might be a player frustrated by losing to this tactic, possibly in lower-tier matches. Their explicit question is about countering Rush B, but deeper needs could include improving their defensive skills, understanding map control, or even coping with feeling overwhelmed by aggressive plays. Maybe they’re looking for both specific in-game strategies and a mindset shift to handle such rushes.

Breaking down the counter-strategies: Pre-aiming and positioning are crucial. Since Rush B is predictable, especially on maps like Dust2, setting up crossfires where teammates cover each other’s angles can neutralize their numbers advantage. Utility usage is another key area—smokes to block sightlines, flashes to disorient, and Molotovs to force them back. The user might not be using utility effectively, so emphasizing that is important.

Also, considering the P90’s weaknesses: it’s less effective at medium ranges. Holding off-angle positions that force Ts into long sightlines could turn the tables. Economic tactics matter too—if Ts eco, counter-rushing with pistols or saving for utility might be better than trying to out-gun them with rifles.

I should also address the psychological aspect. Newer players might panic when rushed, so recommending calm positioning and communication with teammates can help. Mentioning that this tactic is less common in higher ranks could reassure them that as they improve, encountering it decreases.

Need to ensure the advice is practical: specific positions on Dust2, like CT spawn or tunnel control, using smoke spots to block B main, and coordinating pushes with flashes. Highlighting the importance of not overcommitting to B if faked, and having rotations ready.

Lastly, tie it back to the user’s possible unspoken needs—wanting to feel empowered against overwhelming tactics, reducing frustration, and building game sense that applies beyond just Rush B scenarios. Providing clear, actionable steps while explaining the reasoning behind each counter should make the response helpful and comprehensive.