At the helm of David Kelly's King One, Jonny Swan has ruined the perfect scoresheet of Nigel Biggs and his Checkmate XVIII team after an intense second day of competition at the ICRA National Championships on Dublin Bay.

Checkmate continues to lead overall after five races sailed, but King One is now just three points off the top of the leaderboard with the final two races of the Championships left to sail tomorrow (Sunday).

Biggs added another win to his two opening day victories on Friday and looked invincible at lunchtime, but this afternoon, in races four and five, as the breeze went right to 145 degrees and strengthened, the King One crew took advantage and earned their first race win in the last race of the day.

With it all still to play for, a third Howth Half Tonner Mata (Darren Wright) is on 10 points in third place in the 17-boat IRC Two fleet, where HYC entries occupy the top seven places overall. 

Howth Yacht Club's leading Half-Ton Trio

The Checkmate XVIII crew going like a train in the heavier conditions of day two: Dave Cullen, Nigel Biggs, Daragh Sheridan, Suzie Murphy, Andy Sargent, Mark Kenny and Niki Potterton

Jonny Swan steering and Ryan Glynn on mainsheet in the Half Tonner King One

 Darren Wright's Half Tonner Mata, whose crew includes Athens Olympic sailor Killian Collins of Royal Cork

Results are here. Racing concludes on Sunday.