Two-stroke penalty costs Ahn lead at Women's British Open

Sun Ju Ahn of South Korea plays a bunker shot at the 18th hole during the women's British Open golf tournament at Royal Birkdale Golf Club in Southport, northern England, July 12, 2014. REUTERS/Nigel Roddis

(Reuters) - South Korean Ahn Sun-ju cost herself the third round lead when she was penalised two strokes for a rules violation at the Women’s British Open on Saturday.

Compatriot Park Inbee unexpectedly became the sole leader after Ahn dug her left foot into soft sand while taking her stance in a greenside bunker at the final hole at Royal Birkdale in Southport.