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Some times in condition zero or counter strike 1.6 you will notice a strange error, that will not allow you to switch from left to right hand by using the option in the game. when you alt-tabed a lot your gun would switch to left-handed while it still shows right handed in the option menu.
All you have to do is selecting left handed then apply, then select right handed and apply again.

If this doesn’t work, you should be running your game in software mode. Change it to Open GL, or D3D mode. This should fix the problem. If this doesn’t work too, you have no other go than to re-install the game

Games are created by humans and they are likely to come with bugs. Some bugs may be annoying enough to make us hate the game and some might make the game interesting as well. Dust2 one of the most popular map in the most popular first person shooter game, Counter Strike has some bugs as well. I have learned how to take advantage of these bugs from some of my friends who are pro players in the game.

In Dust2 map the bomb site B has 2 entrance, one is through the tunnel and the other is through the doors. Look at the image below.

There is a gap between the crates just outside the door which is leading to the bomb site B. If you put a flash in between this gap, nothing happens, the flash just disappears. Wonder what happened to it. It would have flashed inside the tunnel on the other side of the wall. This come very handy indeed when you are a CT and when the Terrorists are more likely to get in to the tunnel from the T spawn. So once you put the flash, you could run swiftly in the tunnel to take them down