Stick Together
"Counter-Strike 1.6" differs from many other first-person shooters by not respawning players during a round. Any player that dies is out for the rest of the round. Staying close to your team members vastly improves your chances of survival. A group of people can watch multiple directions at the same time, which makes ambushing multiple people difficult. Unless a huge gap in the relative skill of the players on both teams exists, whichever side has more players usually wins any engagement with little to no casualties.
Defusal Kit
The terrorist team is usually required to plant a bomb somewhere on the map to complete their mission objective. The bomb usually explodes after 45 seconds, but the person who configured the server can reduce this time. Normally, it takes 10 seconds for the counterterrorist team to defuse a bomb. The Defusal Kit reduces this time to five seconds. The Defusal Kit is priced at $200, half the price of the most basic pistol. If playing as a counterterrorist, you should make this one of your first purchases because it greatly increases your chances of successfully defusing a bomb. Not only do you have five more seconds to reach the bomb, but you also give your opponents five less seconds to interrupt the defusal attempt.
Unexpected Weapon Selections
Terrorists and counterterrorists have access to a few weapons that can be purchased only by that team. Terrorist-specific weapons favor rapid fire rates and more damaging shots at the expense of range, accuracy and stealth. Counterterrorist specific weapons tend to have silencers and high-powered scopes, allowing them to pick off terrorists without giving away where the shot came from. You can throw off opponents by going for weapons available to both teams that favor the opposite strategy. For example, terrorists using the silenced K&M .45 Tactical pistol or scoped Magnum Sniper Rifle can attack using stealth rather than raw firepower. A counterterrorist player can get the ES C90 submachine gun or M249 machine gun to overwhelm opponents with massive amounts of bullet fire at close range.
Conceding a Round
If you are confident you are not in a position to win a round, the best strategy in "Counter-Strike 1.6" is to give up and find somewhere to hide. This seems counterintuitive because making a last ditch attack in many games is usually always worthwhile on the off chance it might work. The reason this strategy does not work in "Counter-Strike 1.6" is due to how equipment is handled. If you survive a round, you get to keep all of your equipment, whether you win or lose. Anyone who dies, however, gets reset to the basic starting equipment in the following round. You have a much better chance of winning a round by going into the next round well-armed than by making a suicidal, last ditch effort to win the current round.