Based upon the standard Risk board, this map adds control of the oceans to the battle.
Continents
Continents are worth the same as the standard board, with the addition of single territory continents (identified with stars), which are worth +1 all by themselves.
Harbors (marked with an anchor) are also worth +1 all by themselves. All ocean territories are worth +1 (+2 total for harbors) if you also control every adjacent ocean.
Most attacks between land and sea have a +6 to defense (both ways). If there is a harbor in the ocean territory, there is only a +1 to defense (both ways). Harbors are indicated by an anchor icon.
Islands
Please note that unlike the regular risk map you cannot directly attack islands from the main continent. You MUST go through the ocean to complete some continents. Usually you will want to use the harbor.
Starting Scenario
Player territories - 4 units
Star territories - 4 units
Anchor territories within a land continent - 3 units.
Anchor territories between land continents - 5 units.
Red Sea (i.e. O33) is a special case, and starts with 4 units.
Bering Sea (i.e. O1 & O5) is a special case and starts with 6 units across two harbors.
Miscellaneous
Players can hold up to 8 cards.
8 sided dice are used which give a slightly greater than normal edge to attackers.
Math
+1 to defense requires about 1.03 attackers per defender
+6 to defense requires about 2.42 attackers per defender
Default dice requires about 0.76 attackers per defender