Bletchley set up semi-final clash with Towcester
In the fourth meeting between the sides this season, and the second in a week, Bletchley triumphed 22-17 in a closely fought encounter under the lights in Buckingham.
Scoring was slow in the opening stages with both sides cancelling each other out.
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Hide AdBut that changed on 25 minutes when Bletchley capitalised on a 5m scrum, allowing Beth Metcalf to dive over the line to put the visitors 5-0 up.
Buckingham hit back though to level the scores after Bletchley were penalised at a lineout.
But as the half neared its end, Rachael Taylor ran in the points and kicked the extras to go 12-5 ahead.
Just six minutes into the second half, Buckingham narrowed the gap to two points at 12-10.
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Hide AdThey took the lead with 15 minutes to go, but Jodie Denton battled over to make it 17-17, forcing extra time - seven minutes each way.
And a single try in the first period would separate the sides as Jennie Davies fed Caroline Collie to break through and score the decisive try and send Bletchley through.