Colwyn Bay advanced to the 100-ball Welsh Cup North Plate final where a meeting with either Bethesda or Northop awaits.
Put into bat, Tudno scored 65 runs but lost 11 wickets in the process, leaving them with a net total of 10.
Hannah Thornton was leading contributor for the home side with 14 runs.
For the Bay, Jane Smith collected a very impressive 4-6 off her 20 balls. Kerry Roberts took 3-14 off 15 and Samantha Sherrington 3-15 from 20.
Colwyn sealed a 29-run victory after posting 49-2 off their 100 deliveries to secure a net score of 39.
Sherrington made 8, Kerry Roberts and Hannah Kennedy six apiece.
Bethesda and Northop are due to meet in the other semi-final this Sunday.
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