90.1 Race Committee
The race committee shall conduct races as directed by the organizing authority and as required by the rules.

90.2 Sailing Instructions
(a) The race committee shall publish written sailing instructions that conform to rule J2.

(b) When appropriate, for an event where entries from other countries are expected, the sailing instructions shall include, in English, the applicable national prescriptions.

(c) The sailing instructions may be changed provided the change is in writing and posted on the official notice board before the time stated in the sailing instructions or, on the water, communicated to each boat before her warning signal. Oral changes may be given only on the water, and only if the procedure is stated in the sailing instructions.

90.3 Scoring
(a) The race committee shall score a race or series as provided in Appendix A using the Low Point System, unless the notice of race or sailing instructions specify some other system. A race shall be scored if it is not abandoned and if one boat sails the course in compliance with rule 28 and finishes within the time limit, if any, even if she retires after finishing or is disqualified.

(b) When a scoring system provides for excluding one or more race scores, any score that is a Disqualification Not Excludable (DNE) shall be included in a boat’s series score.

(c) When the race committee determines from its own records or observations that it has scored a boat incorrectly, it shall correct the error and make the corrected scores available to competitors.

(d) The race committee shall implement scoring changes directed by the protest committee or national authority as a result of decisions made in accordance with the rules.

(e) When so stated in the notice of race, notwithstanding the provisions of rules 90.3(a), (b), (c) and (d), there shall be no changes to race or series scores resulting from action, including the correction of errors, initiated more than 24 hours after
(1) the protest time limit for the last race of the series (including a single-race series);
(2) being informed of a protest committee decision after the last race of the series (including a single-race series); or
(3) the results are published. However, in exception, changes to scores shall be made resulting from a decision under rules 6, 69 or 70. The notice of race may change ‘24 hours’ to a different time.