coasts and oceans that border the coast that it is on. For example, a fleet occupying the southern coast of Bulgaria cannot move into Romania or the Black Sea, but a fleet on the east coast could. End-of-year and supply centers After each Fall move, newly acquired supply centers become owned by the occupying player, and each power's supply center total is recalculated; players with fewer supply centers than units on the board must disband units, while players with more supply centers than units on the board are entitled to build units in their Home centers (supply centers controlled at the start of the game). Players controlling no supply centers are eliminated from the game, and if a player controls 18 or more (being more than half) of the 34 supply centers, they are the winner. Players who remain may also agree to a draw – around half of all games will end in a draw. Variants Several boardgames based on Diplomacy have been commercially published. Additionally, many fans of the game have created hundreds of variants of their own, using altered rules on the standard map, standard rules on a different map, or both. Rulebook provision for fewer than seven players The rules allow for games with two to six players, closing parts of the standard board, but these are used only in casual play, and are not considered standard Diplomacy in tournament, postal, or most forms of online play. For example, if there are six players, everyone plays one country and Italy is not used; for five players, Italy and Germany are not used. The original rules did not include additional guidelines, but the Avalon Hill set included suggestions, such as individual players using multiple countries, and additions. Another approach to solving the problem of fewer than seven players is the use of the Escalation Variant Rules by Edi Birsan: Players start with no pieces on the board Players put one piece down on the board in any province one at a time (starting with the youngest player) After reaching the maximum number of pieces the players start the game with ownership of their starting provinces. At the end of Fall 1901 with their adjustments players write down their three HOME centers for the rest of the game. This is done without negotiations and may result in two players declaring the same province. However, in order to build