September 2014 - Opposite Tacks At The Finishing Line II And Unusual Finishing Lines II

placeholder image

September 2014 - Opposite Tacks At The Finishing Line II And Unusual Finishing Lines II

Last month I discussed opposite tacks at a leeward finish. This month I want to look at a similar situation at a windward finishing line and a question about gate marks.

In the first diagram, the Blue and Yellow boats are approaching the pin end of a windward finishing line with Yellow on starboard tack and Blue on port tack. Blue had read my August article so thought that he was entitled to room at the finishing mark. Since that meant he would be exonerated for breaking rule 10, he didn’t keep clear of Yellow and Yellow had to avoid him. If we look at rule 18.1a, though, we see that rule 18 does not apply “between two boats on opposite tacks on a beat to windward”. Since rule 18 does not apply, Blue is not entitled to mark-room, is not exonerated for breaking rule 10 and must take a penalty. 

18.1 When Rule 18 Applies
Rule 18 applies between boats when they are required to leave a mark on the same side and at least one of them is in the zone.
However, it does not apply

(a) between boats on opposite tacks on a beat to windward,
(b) between boats on opposite tacks when the proper course at the mark for one but not both of them is to tack,
(c) between a boat approaching a mark and one leaving it, or
(d) if the mark is a continuing obstruction, in which case rule 19 applies.
18.2 Giving Mark-Room

When a boat is sailing within the room or mark-room to which she is entitled under a rule of Section C, she shall be exonerated if, in an incident with a boat required to give her that room or mark-room,
(a) she breaks a rule of Section A, rule 15 or rule 16, or
(b) she is compelled to break rule 31.

The next diagram is a follow-on to the July article on unusual finishing lines. Again I am looking at a situation that appeared with a shortening of the course. This time, the course was supposed to be shortened at a leeward gate. The gate is between the yellow and red marks. The committee boat sat beside the yellow mark. The Orange boat thought that the finish was between the boat flying the S flag and the closest mark as described in rule 32.2(a) so it tried to finish as shown. Gate marks however are covered under rule 32.2(c) and the finishing line is actually between the gate marks. White has just finished; Orange has not. Sometimes race committees will sit very close to one mark (or even tie up to it) so that it is clear that boats should not pass between them and the mark, but this is not required. 
32.2 If the race committee signals a shortened course (displays flag S with two sounds), the finishing line shall be,
(a) at a rounding mark, between the mark and a staff displaying flag S;
(b) at a line boats are required to cross at the end of each lap, that line;
(c) at a gate, between the gate marks.
The shortened course shall be signalled before the first boat crosses the finishing line.

© Copyright 2014 Andrew Alberti
Posted: 9/1/2014 11:01:11 AM by Andrew Alberti

Trackback URL:

This page provides links to a set of articles original published in Kwasind magazine. The versions here include animated diagrams. The original articles can be found within the original magazines which are available online back to January 2007. 

Articles before December 2016 are based on the Racing Rules of Sailing 2009-12 or 2013-2016 and have not been updated to reflect the changes that apply as of January 2017 with the publication of the Racing Rules of Sailing 2017-20. A copy of the new rules can be found on
Andrew Alberti has been writing these monthly articles in the Kwasind since early 1997.  They explain the Racing Rules of Sailing. Andrew is a National Judge and National Umpire. He is a member of the Sail Canada Rules and Appeals Committees. The interpretation of the rules contained in the articles is Andrew's and not that of the RCYC or any of the committees he sits on. 

Send your questions to Andrew at


166 Years of Tradition | World-Class Sailing | Toronto Island & City Clubhouse
June 2020 - An Unusual Start
May 2020 - A Big Collision
March/April 2020 - A Three-Boat Finish
January/February 2020 - An Overview of the Right-of-Way Rules V
November/December 2019 - An Overview of the Right-of-Way Rules IV
Post Archive
June 2020(1)
May 2020(1)
March/April 2020(1)
January/February 2020(1)
November/December 2019(1)
September/October 2019(1)
July/August 2019(1)
May/June 2019(1)
March/April 2019(1)
January/February 2019(1)
November/December 2018(1)
September/October 2018(1)
July/August 2018(1)
May/June 2018(1)
March/April 2018(1)
January/February 2018(1)
November/December 2017(1)
October 2017(1)
September 2017(1)
August 2017(1)
July 2017(1)
June 2017(1)
May 2017(1)
April 2017(1)
March 2017(1)
January/February 2017(1)
December 2016(1)
November 2016(1)
October 2016(1)
September 2016(1)
August 2016(1)
July 2016(1)
June 2016(1)
May 2016(1)
April 2016(1)
March 2016(1)
January/February 2016(1)
December 2015(1)
November 2015(1)
October 2015(1)
September 2015(1)
August 2015(1)
July 2015(1)
June 2015(1)
May 2015(1)
April 2015(1)
March 2015(1)
January 2015(1)
December 2014(1)
November 2014(1)
October 2014(1)
September 2014(1)
August 2014(1)
July 2014(1)
June 2014(1)
May 2014(1)
April 2014(1)
March 2014(1)
January 2014(1)
December 2013(1)
November 2013(1)
October 2013(1)
September 2013(1)
August 2013(1)
July 2013(1)
June 2013(1)
May 2013(1)
April 2013(1)
March 2013(1)
January 2013(1)
December 2012(1)
November 2012(1)
October 2012(1)
September 2012(1)
August 2012(1)
July 2012(1)
June 2012(1)
May 2012(1)
April 2012(1)
March 2012(1)
February 2012(1)
January 2012(1)
December 2011(1)
November 2011(1)
October 2011(1)
September 2011(1)
August 2011(1)
July 2011(1)
June 2011(1)
May 2011(1)
April 2011(1)
March 2011(1)
February 2011(1)
January 2011(1)
November 2010(1)
October 2010(1)
September 2010(1)
August 2010(1)
July 2010(1)
June 2010(1)
May 2010(1)
April 2010(1)
March 2010(1)
February 2010(1)
January 2010(1)