Oxfordshire's Deta Hedman eased into the semi-finals of BDO World Darts Championship with a 2-0 victory over Sharon Prins at Lakeside.
Hedman won both sets 3-2, in a remarkable match in which the first nine legs all went against the throw.
She led 1-0 and 2-1 in the first set before clinching the deciding fifth leg with a double 12.
The 58-year-old looked like taking a 2-1 in the second set, but the Dutch player recorded a super check-out of 138 to go ahead.
However, Hedman levelled at 2-2 and then completed her victory with a bullseye in the decider - the only leg to be won by the player throwing first.
Hedman will now meet either Lisa Ashton or Fallon Sharrock in the last four.
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