Seventeen-year-old Amy Boulden from Wales will play 18-year-old Alexandra Bonetti from France, and it will be an all-England affair in the second tie between defending champion Kelly Tidy, 19, from Lancashire against 16-year-old Lauren Taylor from Buckinghamshire.
Boulden ended the great run by South African team player Kim Williams, who had beaten local favourite Stephanie Williams, by 4 and 3 in the third round. Bonetti, from Paris, beat South Africa's Illiska Verwey with a superb approach shot at the 19th after a titantic struggle in which the lead changed hands repeatedly over the closing holes.
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Hide AdTidy (Royal Birkdale) beat good friend Charlotte Wild (Mere) by 4 and 3 with three under par figures.
Taylor earned her semi-final by beating France's Perrine Delacour 4 and 3.