Pistol round (The most important round for everyone)
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Saving for next round is your choice, but here are the common paths:
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1. Terrorist side:
Get 3 of your teammates buying Kevlar, if you already see 3 buying kevlar armor, tell the other one to either buy Tec-9/CZ-75 Auto or buy grenades (Smoke + Flashbang) and you will choose the last option.
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2. Counter Terrorist side:
Same to the other side; always have one member buying kit, but I do not recommend buying Five Seven/CZ-75 first round, Or Dual Berettas for these reasons:
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+) During this round, you only have 800$, which is not enough to buy helmet. This shows that any pistol can one-shot on the head. Buying Five Seven is not cost-effective as it is expensive (500$); if you die, it will be a waste of money, and the enemy will pick it up and use for next round (Five Seven's unique feature is that: It's a ******* meme [One shot head shot from close to medium range with helmet opponent]).
+) CZ-75 has limited ammo (12/12), and once you are out of ammo, you are fucked. Not to mention is is pricy too (500$)
+) Dual Berettas? They have low armor penetration. Don't buy it cause the enemy will just buy armor, and you will be shot to the head before you could kill them (pffts).
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Second round
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1. When you win the first round as Terrorist:
If you are confident enough, just get the best person buy AK-47, and the rest buy SMG, remember to buy grenades too. Without grenades, you can not do anything good. If possible, get one person buy SSG 08 if your team (or you) has an excellent marksman
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2. When you lose first round as Terrorist:
I. Successfully planted the bomb: You still have enough money to buy the second round. Be wise.
II. Not able to get the bomb planted: Save.
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3. When you win & lose as Counter Terrorist:
Same to the Terrorist, but when you lose, you can save for third round, or you can have one or two members buying SMG. Always have one person buying kit.
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Third round (Buy round)
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- Buy an AWP if you (or your teammate) are confident with your (or their) aim. Priority over weapon's quality: AWP > AK-47 > M4A4/M4A1S > Famas/Galil > SMG
Note: When you win the round, if you see an AWP/AK-47 and even when you don't use it, pick it up, as the other teammates will use it. But if you have an AK-47 and you see an AWP, pick it up. AWP is better than AK-47 for many obvious reasons.
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When you are losing
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Save and try to win with the enemies' weapon. If you still lose the round, you still have money to buy next round.
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When you are winning
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There is no reason to buy anything except armor+helmet and grenades when you are winning. You only need to buy weapons for your allies that died last round, but don't waste your money.
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When the enemy is on eco
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Buy SMG for anti-eco situation.
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Which weapon to pick up (Already stated above)
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When to save and when not to save
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When you have 4 opponents and you alone, keep the most valuable weapon and try to hide until the end of the round. Never save in last round of half/match point (if possible)/final round.
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Other warning:
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NEVER buy auto sniper rifles during the rounds except the match point/final round, because the enemy team will be super salty when you use auto sniper rifle, and they will save next few rounds for auto sniper rifle. Trust me, the whole game will be horrible.