Instructions
Split your counter-terrorist team into two groups. You can cover twice as much space and reach either of the terrorist's two possible bomb locations as quickly as possible.
Purchase bomb defusal kit at the beginning of each round so you can defuse the bomb quickly.
Have both your teams rush to find the entry paths to both bomb spots. The true spot of the two is the one the larger group of terrorists are headed toward. Once you discover it, have that counter group send a message to the other group as to which spot it is.
Stand over the bomb if it has been planted, and press the "use" key. The default key for this command in this game is the "E" key. From there, it's just a matter of hoping you have enough time left to defuse the bomb before detonation.