The 7 Gates is a Protoss all in opening which aims to destroy your Zerg opponent's third base before he has the time to 'tech' the Mutalisks or the Infestors. It is composed of 2 to 3 Immortals and a large number of Sentries that will be used to separate the enemy army thanks to the Force Fields. In addition, it is important to support your push with a Warp Prism that will reinforce your army during the push and/or micro-management of your damaged units during the battle.
This strategy starts from a very economic opening (Nexus 17) for a timing attack at 9 minutes 30.
Pylon
Nexus
Forge
Pylon
Gateway
Assimilator (x2)
Construction of your Cybernetics Core + Zealot
At 100 Ga - Start your + 1 Attack
Start the research for your Warpgate + Stalker
38
Robotics Bay
Chrono Boost your Immortals (upto 3)
Assimilator (3 and 4)
7'30
Gateways (2, 3 and 4)
Gateways (5, 6 and 7)
** the numbers 9/17/20... refer to your population in the game **
Stop the production of your Probes when you have 45.
When your last Immortal has finished, don't forget to get out your Warp Prism and attack! Your last three Gateways have to finish at the same time as your attack. If you have a Pylon to Warp your first units it's even better! During your first attack your army should be composed of 3 Immortals, 1 Zealot, 1 Stalker and 7 Sentries. After you have produced your Warp Prism, you will have to build an Observer for security against enemy units that can Burrow.
