Case 43: In the photo below, Rebel 4164 tacks to starboard right at the windward mark to be left to port and just in front of the Rebel already laying the mark on starboard (left). The latter is forced to luff up nearly head to wind in order to avoid a collision.
In addition to the obvious risk of infringing rule 13 (tacking too close), in what other way does 4164 foul the other boat here?

Answer:
1. 4164 is breaking rule 18.3 (Tacking in the Zone) by forcing "the other boat to sail above close-hauled to avoid her".

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