This was the first computer game i ever played that had a two player hot seat with fog of war capability, a unit parameter info screen, booby traps, opportunity fire and an active enviroment that could suffer and inflict collateral damage (see 3:45 where a missed laser bolt ignites oxygen bottles destroying everything in one big chain reaction)
Then for 3D battle chess it was Hogs of War, even though it looked and sounded silly the tactics were complex forcing you to think many moves ahead and get your opening moves right, for example one scenario gave the advantage to the first player to get and use a jet pack to gain the high ground and access to a howitzer