How then can this concept be applied to Counter-Strike?

First, understand this: to attack is to utilize your advantages while minimizing your disadvantages, and at the same time stripping your opponents of their advantages, which inevitably causes their disadvantages work against them.

If we look closely at Counter-Strike and the goals to win as Counter-Terrorists and Terrorists, we will notice a few things. Terrorists need to either take out the Counter-Terrorists or to have the bomb explode in order to win the round. As well, they need to do this within a time period and thus time is working against them. On the other hand, Counter-Terrorists win by default if time runs out. What they have to do is simply not allow the Terrorists to achieve their goals. Well then, should we really label the Terrorists as the offensive team and the Counter-Terrorists as the defensive team? Under even circumstances, the Terrorists are always at a disadvantage whether it is time-wise, goal-wise, or position-wise.

Bringing chess back into this, we’ll look at why the Sicilian Defense system is actually labeled as a defensive stance, and why in reality it is one of the most aggressive counter-attack offensive strategies in chess.

1. White piece moves first, pawn goes from e2 to e4. Black piece goes second, it responds with the c7 pawn moving to c5. Black has already initiated its attack, by moving pawn to c5 it attacks d4, meaning white can not continue to dominate center board by moving a pawn to d4.

2. White then moves Knight from g1 to f3. This is a common move; by doing so, White secures d4 square and also tells Black that it intends to battle for d4 square later. Black responds with pawn from d7 to d6. This is an actual defensive move; it defends e5 square so the White knight in f3 cannot advance further. In other words, it is attacking e5 (or pre-firing if you would like to call it that).

3. White initiates the attack by taking a pawn from d2 to d4. Black responds with the pawn from c5 and takes that piece. White takes that pawn back with the knight in f3. Fair exchange.
 
4. Black moves Knight from g8 to g6. It then, in the following turns, moves pawn from g7 to g6 and eventually Bishop from f8 to g7, creating what is known as a “fianchettoes” meaning the Bishop now can attack the whole h8-a1 diagonal.

What follows would be a very aggressive battle from Black as it can then “castle” (swapping King and Rook’s position). This means that even though Black started with an incentive to defend, it is actually the attacker: it is attacking the middle that White had originally vied for control of due to the first move.