A pose you this question, what is a tactic/strategy that you often use, and you rarely see others doing it. This can apply to shooters, RTS, or whatever really; it just has to be something that would be rarely done by other players
My Example: In StarCraft 2, what I will often do against zerg. I load up a warp prism fairly early on with some units that could destroy a mineral line. I unload these units in the main, and warp in a couple extras forcing the opponent to pull most of this force back. Before he gets there I pull the warp prism out. I then hit his natural while he is fighting off the units, sealing off the ramp with force fields. One I do some damage, or I am about to run out of energy, I put a couple of blink stalkers and sentries close to the cliff and away from my main force. I pull my main force back, and using blink/warp prism, I get the units up the cliff. Seal off the ramp, kill whatever forces he left, and maybe snipe a tech building. Now I have devastated the zerg, and can easily win.
My Example: In StarCraft 2, what I will often do against zerg. I load up a warp prism fairly early on with some units that could destroy a mineral line. I unload these units in the main, and warp in a couple extras forcing the opponent to pull most of this force back. Before he gets there I pull the warp prism out. I then hit his natural while he is fighting off the units, sealing off the ramp with force fields. One I do some damage, or I am about to run out of energy, I put a couple of blink stalkers and sentries close to the cliff and away from my main force. I pull my main force back, and using blink/warp prism, I get the units up the cliff. Seal off the ramp, kill whatever forces he left, and maybe snipe a tech building. Now I have devastated the zerg, and can easily win.