"Keep Clear" When the boats are overlapped on the same tack, the leeward boat must be able to change course in both directions without immediately making contact with the windward boat.
"Leeward and Windward" When sailing directly downwind, a boat's leeward side is the side on which her mainsail lies. The other side is her windward side. In all other sailing directions the wind direction determines the windward and leeward boats.
"Clear Astern and Clear Ahead" On the same tack, one boat is clear astern of another when she is behind an imaginary line perpendicular to the other boat's centerline at it's stern. The other boat is clear ahead.

10. When boats are on 'opposite tacks', a port-tack boat shall "keep clear" of a starboard-tack boat.

11. When boats are on the 'same tack' and "overlapped", a windward boat shall "keep clear" of a leeward boat.

12. When boats are on the 'same tack' and not "overlapped", a boat "clear astern" shall "keep clear" of a boat "clear ahead".

13. While tacking, from the time a boat passes 'head to wind' until she is 'close hauled', she has no rights under rules 10, 11, and 12.

14. A boat shall avoid contact with another boat if reasonably possible.

15. When a boat aquires 'right-of-way', she shall 'initally' give the other boat 'room' to "keep clear".

16.1 When a 'right-of-way' boat changes course (to luff, etc.) she shall give the other boat 'room' to "keep clear".

17.1 On the 'same tack', if a boat "clear astern" gains an 'overlap' to leeward, within two boat lengths of a boat she is passing, she shall not sail above her 'proper course' while they remain overlapped and within six feet of each other.
17.2 On the 'same tack', while a boat being passed is within six feet (two hull lengths) of an overlapped leeward boat, or a boat 'clear astern' and steering to pass on the leeward, she shall not sail below her 'proper course'.

18.2(a) (Room at the Mark) When two boats are 'overlapped' at the time the first of the two reach the four boat circle, the outside boat shall give the inside boat 'room' to round or pass the mark.
18.2(e) If there is reasonable doubt that a boat obtained or broke an overlap in time, it shall be presumed she did not. If the outside boat is unable to give room to an overlapped boat, rule 18 does not apply.
18.1(a) This rule does not apply at the starting mark. A leeward boat does not have to give windward boats room to pass between her and the starting mark.

22.1 If reasonably possible, a boat not racing shall not intefere with a boat that is racing.

61.(Protest) If you have the right-of-way and another boat makes you change course to avoid hitting her, she has broken a rule.