Rok 1920 is a two-player, intermediate complexity, strategic-level wargame simulation of the "Polish-Soviet War", the Soviet attempt to conquer Poland. The game is based on programmed instructions. There are 4 introductory scenarios, leading to the Campaign Game. 4 additional scenarios are included, too. Special rules include moral advantage, Revolutionary Mobilization made by CHEKA, limited Polish-Lithuanian War, Ukrainian Sich Rifles supporting the Soviets and Ukrainian Army supporting the Poles, counter-revolutionary Russian, Byelorussian and Cossack troops and support units: tanks, flotillas, armored cars and trains.