There are also a number of other optional rules in the rulebook, however none of the options are used at the convention events I have attended over the years. The sequence of play is broken into several segments in which the Japanese is required to move first in each segment. There is a considerable amount of player interaction in a turn due to the alternating play in each segment of the sequence of play. The sequence is move patrolling ships, place LBA one at a time alternating between Japanese and US, move amphibious units, move raiding ships, place submarine. LBA can be placed in any sea area which is touched by a friendly port or base.
Amphibious units move two areas.
The submarine can be placed in any sea area. Combat is then resolved one area at a time in any order selected by the Japanese player. Combat lasts an indefinite number of rounds, ending only when one side is either wiped out or retreats successfully. Each sea area is worth a fixed number of POC for each side, with the value skewed according to the areas relative importance to each side. A considerable positional bonus for controlling a sea area is that enemy ships must stop upon entering.