This situation happened a couple of times before, but I havent got the actual game/turn anymore (we have moved on)
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It is like this:
If my ship -clean- can do 3 moves with wind in port or sb sails aft and ALL 3 tiers of sail blocks are complete, then it can do a Z(zig-zag) move (turn-move-turnback) so that the ship's side stays parallel with what you started.
But once there are a couple of sail blocks shot away -but STILL having the 3 tiers of sails, and STILL having the 3 moves possible in the SHip data box-, I noticed that I CAN NOT make the Zmove. I have only 2 moves left!