It is the first of the RPG/turn-based strategy series. In Chinese it is called "英傑傳". I would translate it to "Legends of Heroes of the Three Kingdoms".
I don't know of its official English name, but if you search around, you will see it being referred to as "Reko3", the name of the folder it installs into.
The game play is very similar to Super Robot Wars. In it your main character is Liu Bei, and as the game moves on you're given choices to follow history (e.g. let Guang Yu die) or change history (help Guang Yu escape in that battle, against all odds). You can play successfully and unite ancient China, or you can let Liu Bei die, and fight a hopeless fight with Zhuge Liang...
Its success created the later and more well known games... Legends of Kong Ming (Zhuge Liang), Cao Cao, etc.
:suicide:
It's open ground.