Oedo year (Civ2)

An Oedo year is a special year, occurring in Civilization II, when periods of anarchy come to an end and players are permitted to chose a new form of government. It occurs every 4th turn, regardless of the number of in-game years this involves. Barbarians are spawned on a 16-turn cycle and thus appear every fourth Oedo year.

Perhaps the simplest method to track Oedo leap year is to count turns after installing a new government to end a period of anarchy, or after a Barbarian horde spawns.

Description[]

In Civilization II, periods of anarchy are highly wasteful and full of unrest; reduced food and shield production can even require disbanding units. Players typically want to limit such periods as much as possible.

Around the year 2000, the Apolyton poster Oedo noted that Civilization II resolves its periods of anarchy during the city phase of every 4th turn after game start. For example, a game beginning in 4000 BC will resolve periods of anarchy in the years 3850 BC, 3650 BC, 3450 BC, 3250 BC, etc. A player aiming to minimize periods of anarchy should either

undertake a revolution during the turn before an Oedo year or
launch a revolution upon discovery of a new government technology during the city phase of an Oedo year itself

Tables[]

Consistent application of this strategy is rendered difficult by

the changing number of years represented by each turn over the course of a game;
the changing number of turns permitted to different difficulty levels; and
the changing number of turns permitted to different map sizes (= X × Y) at the warlord, prince, king, and emperor difficulty levels.

	420	470	520	570
Chieftain	—	—	—	All
Warlord	—	—	<3000	<10000
Prince	—	<3000	<6000	<10000
King	<3000	<6000	<10000	—
Emperor	<6000	<10000	—	—
Deity	All	—	—	—

The game is not able to process these values for map sizes larger than 10,000. Instead, the number of turns will be set according to whatever value between 1,000 and 10,000 was last used.

570-turn game[]

The Oedo years of a 570-turn game are

3940 BC	2660 BC	1380 BC	100 BC	1090	1615	1824	1901	1965
3860 BC	2580 BC	1300 BC	20 BC	1130	1635	1832	1905	1969
3780 BC	2500 BC	1220 BC	60	1170	1655	1840	1909	1973
3700 BC	2420 BC	1140 BC	140	1210	1675	1848	1913	1977
3620 BC	2340 BC	1060 BC	220	1250	1695	1853	1917	1981
3540 BC	2260 BC	980 BC	300	1290	1715	1857	1921	1985
3460 BC	2180 BC	900 BC	380	1330	1735	1861	1925	1989
3380 BC	2100 BC	820 BC	460	1370	1752	1865	1929	1993
3300 BC	2020 BC	740 BC	540	1410	1760	1869	1933	1997
3220 BC	1940 BC	660 BC	620	1450	1768	1873	1937	2001
3140 BC	1860 BC	580 BC	700	1490	1776	1877	1941	2005
3060 BC	1780 BC	500 BC	780	1515	1784	1881	1945	2009
2980 BC	1700 BC	420 BC	860	1535	1792	1885	1949	2013
2900 BC	1620 BC	340 BC	940	1555	1800	1889	1953	2017
2820 BC	1540 BC	260 BC	1010	1575	1808	1893	1957
2740 BC	1460 BC	180 BC	1050	1595	1816	1897	1961

520-turn game[]

The Oedo years of a 520-turn game are

3850 BC	925 BC	230	830	1430	1756	1863	1923	1983
3650 BC	825 BC	270	870	1470	1764	1867	1927	1987
3450 BC	725 BC	310	910	1505	1772	1871	1931	1991
3250 BC	625 BC	350	950	1525	1780	1875	1935	1995
3050 BC	525 BC	390	990	1545	1788	1879	1939	1999
2850 BC	425 BC	430	1030	1565	1796	1883	1943	2003
2650 BC	325 BC	470	1070	1585	1804	1887	1947	2007
2450 BC	225 BC	510	1110	1605	1812	1891	1951	2011
2250 BC	125 BC	550	1150	1625	1820	1895	1955	2015
2050 BC	25 BC	590	1190	1645	1828	1899	1959	2019
1850 BC	30	630	1230	1665	1836	1903	1963
1650 BC	70	670	1270	1685	1844	1907	1967
1450 BC	110	710	1310	1705	1851	1911	1971
1250 BC	150	750	1350	1725	1855	1915	1975
1050 BC	190	790	1390	1745	1859	1919	1979

470-turn game[]

The Oedo years of a 470-turn game are

3850 BC	925 BC	460	1330	1715	1853	1913	1973
3650 BC	825 BC	540	1370	1735	1857	1917	1977
3450 BC	725 BC	620	1410	1752	1861	1921	1981
3250 BC	625 BC	700	1450	1760	1865	1925	1985
3050 BC	525 BC	780	1490	1768	1869	1929	1989
2850 BC	425 BC	860	1515	1776	1873	1933	1993
2650 BC	325 BC	940	1535	1784	1877	1937	1997
2450 BC	225 BC	1010	1555	1792	1881	1941	2001
2250 BC	125 BC	1050	1575	1800	1885	1945	2005
2050 BC	25 BC	1090	1595	1808	1889	1949	2009
1850 BC	60	1130	1615	1816	1893	1953	2013
1650 BC	140	1170	1635	1824	1897	1957	2017
1450 BC	220	1210	1655	1832	1901	1961
1250 BC	300	1250	1675	1840	1905	1965
1050 BC	380	1290	1695	1848	1909	1969

420-turn game[]

The Oedo years of a 420-turn game are

3850 BC	825 BC	620	1700	1859	1923	1987
3650 BC	725 BC	700	1740	1863	1927	1991
3450 BC	625 BC	780	1756	1867	1931	1995
3250 BC	525 BC	860	1764	1871	1935	1999
3050 BC	425 BC	940	1772	1875	1939	2003
2850 BC	325 BC	1020	1780	1879	1943	2007
2650 BC	225 BC	1100	1788	1883	1947	2011
2450 BC	125 BC	1180	1796	1887	1951	2015
2250 BC	25 BC	1260	1804	1891	1955	2019
2050 BC	60	1340	1812	1895	1959
1850 BC	140	1420	1820	1899	1963
1650 BC	220	1500	1828	1903	1967
1450 BC	300	1540	1836	1907	1971
1250 BC	380	1580	1844	1911	1975
1050 BC	460	1620	1851	1915	1979
925 BC	540	1660	1855	1919	1983