André Geraque Kiffer 
The Wargames, The Roman Art And Science Of War [EPUB ebook] 

Board wargames are one of the most common forms of conflict simulation in mathematical models throughout history. They are based on a map, topographic or from a satellite photo, where a hexagonal grid (numbered) or other geometric shape is applied to regulate the positioning and movement of the parts (forces). The pieces, like those of chess, are identified by symbols, colors and numbers that register their historical qualities and quantities. Two tables are basic, the effects of geography (terrain) — associated with weather conditions — on the movements and the likely outcomes (according to the relativity of opposing powers) of the combats on the abilities of the pieces involved. The sequence of each game is divided into a set number of turns, or other names, which vary according to the time scale, and may range from minutes to years.