Yom Kippur is a wargame about the 4th Arab-Israeli conflict: the 6th of October 1973, during the Yom Kippur holiday and also during the Ramadan, a combined attack was launched by the Egyptian army, coming through the Suez canal in the south, and the Syrian army, coming through the Golan Heights, in the north of Israel.
The game includes basic rules and advanced rules, and more complex aircraft managements rules. The 2 maps use hexagons to regulate placement and movement of units, and have overlays for the hills creating a 3D effect. The smaller map represents the area around the Golan Heights: the frontier region between Israel, Lebanon, Syria and Jordan. The Jordan River crosses the map from north to south, with the Galilean Sea in the middle. The big map represents the Sinai, focused on the area around the Suez Canal.
The basic game is only played on the Sinai map. Each turn corresponds to 2 days and is subdivided into 10 phases. The Egyptian player goes first, taking 4 phases. Then the Israeli player takes 6 phases. During each phase players can move their units. Combat takes place, using a calculation based on the number of units a player has.
The advanced game is played on both maps by 2, 3, or 4 players. The aircraft combat rules are introduced. The aircraft are divided into 3 categories: bombers, interceptors, and fighter-bombers. Each turn is divided into 9 phases. Arabian player turn has 4 phases and the Israeli 5.
Victory is calculated by comparing victory points:
- for Israel, 20 points if Damascus is occupied, 5 points for any other Syrian city occupied, 2 points for each intact bunker, 1 point for each reduced bunker, 5 points for each unit standing west of the Canal, 2 points for each Egyptian bridge destroyed.
- for the Arabs, 10 points for each Israeli city occupied, 2 points if the Syrian bunker remains intact, 10 points for each controlled pass, 1 point for each unit exiting along the coast road to Israel, 1 point for each Israeli unit eliminated. If less than 16 units are standing east of the Canal, the player has to remove (16 - number of unit) to the score.
- Yom Kippur