All Working Counter-Strike: Source Cheats - PC

Cheat mode
Press [~] during game play to display the console window. Then, type sv_cheats 1 to enable cheat mode. Then, enter one of the following codes to activate the corresponding cheat function:

give <name> - Spawn indicated item
impuse 101 - Ammunition for weapons
bot_stop <0 or 1> - Toggle bot AI on/off
bot_add_ct or bot_add_t - Allow bot to join game for indicated team
bot_kill - Kill all bots
bot_pistols_only <0 or 1> - Toggle bot using pistols only
bot_snipers_only <0 or 1> - Toggle bot using snipers only
bot_auto_follow - Bot automatically follows you if you do not give them orders
bot_defer_to_human 1 - Bots will not do mission objectives and will expect humans to do it
bot_kick - Kick all bots from game and leaves humans to play
bot_knives_only - Bots use only knives
bot_prefix <prefix> - Bots have a prefix in their name
bot_show_nav - See where bot is going
sv_clienttrace 99999999999 - Weapon hits nearest enemy

Imortality
Type /bind p "chooseteam;menuselect 6;menuselect <1 or 2>;menuselect 2" at the console window in v1.1 or greater. Note: Enter "1" for the terrorists or "2" for the counterterrorist sides. After dying, press [P].

Weapon names
Use one of the following entries with the give code to spawn the indicated weapon:

M249 (heavy machine gun): weapon_m249
TMP (silenced SMG): weapon_tmp
M4A1 (silencable rifle): weapon_m4a1
Deagle (Night Hawk): weapon_deagle
HE grenade (high explosive): weapon_hegrenade
AWP (magnum sniper rifle): weapon_awp
P90 (gun with 50 bullets per clip): weapon_p90
Scout (weakest sniper rifle): weapon_scout
Glock (terrorist default pistol): weapon_glock

First round advantage
On the first round it is advisable to buy Kevlar (body armor), as it takes in around 15% of damage done by pistols (which are only used in the starting rounds).

Surprise defense
If your enemy attacks in surprise from an angle you cannot see, it is always best to jump as your opponent will not expect that.