This set of rules are a considerable improvement over and above the original rules published originally in He's Dead Jim No.17. Many of the changes included here were discussed by myself with Tim Sharrock (the original designer) back in 1979, others stem from comments made by Denis Jones in Surfa Rosa 5, and yet others are refinements of my own. Abstraction A/F rules are available here.
0. Regular Diplomacy rules apply except when they don't.
1. The game begins in Winter 1900 which is played as a separate season.. Players may decide which type of unit to build in their home centres in readiness for Spring 1901. Russia may build F(StP)nc if it wishes.
2. Any army in a coastal province may, instead of being ordered to move or support, be ordered to turn into a fleet. Such a transformation will be successful provided the unit is not dislodged that move.
3. Rising sea levels result in the gradual submergence of provinces according to Table 1 below. Submergences occur every year after any adjustments in Winter. Once submerged, a s.c. is effectively destroyed and may not be used for the following Winter's adjustments.
Table 1 - Submergences
W 1901: Lon, Hol, Bel, Gas, Ven, Lvn.
W 1902: Yor, Pic, Apu, Rum, Sev, Fin, Syr, Den, Lpl.
W 1903: Arm, Bre, StP, Par, Tus, Nap, Bud, Kie.
W 1904: Ber, Mos, Mar, Por, Rom, Vie, Bul, Gre, Pru, Ruh, Gal, Ukr, Con.
W 1905: Wal, Cly, Swe, Tri, Alb, War, Ice.
W 1906: Edi, Spa, Tun, Ser, Smy, Sil, Boh.
W 1907: Nwy, Mun, Pie, Tyr, NAf, Bur, Ank.
4. Armies in provinces which submerge are drowned!
5. New supply centres are formed in the course of the game, after all Winter retreats and adjustments, according to Table 2.
Table 2 - New Supply Centres
W 1901: Wal, Ruh, Tyr.
W 1902: Ukr, Ice.
W 1903: Pie.
W 1904: Boh, Sil.
W 1905: Swi.
W 1906: NAf.
When a new s.c. is created it immediately comes under the control of (1) any unit occupying that province, (2) the last country to have a unit in that province (spring or autumn), (3) the country within whose boundary the new s.c. lies or (4) if none of the above it is neutral.
6. Iceland is a valid space in this variant and it becomes passable after W 1901. The province of Switzerland becomes passable after W 1904.
7. Players may build units in any vacant supply centre which they control.
8. As per Deluge I, all Abstraction A/F convoy rules apply.
9. The winner is the survivor (if any) after W 1908.