Ulster Elks and Ards are through to the semi-finals of the women's Irish Senior Cup after wins on penalty strokes.
Elks edged Pegasus 4-2 after the sides drew 1-1 while it was the same score in Dublin where Ards beat Railway Union 6-5, on penalties to reach the last four.
Hermes and UCD complete the semi-final line-up.
Lisnagarvey beat Railway Union 6-3 in the men's competition with Three Rock Rovers and Glenanne also through after wins over Cork C of I and YMCA.
It was an enthralling cup tie at Queen's played in Arctic conditions, but both Pegasus and Ulster Elks rose to the occasion in a full-blooded Ulster derby.
Jordan Page gave the Elks the lead in the first half as she knocked in a rebound after Shirley McCay's shot from a penalty corner was initially saved.
Pegasus missed a number of chances but eventually equalised with just six minutes remaining when Alex Speers deflected in a crash ball fired into the circle from Pamela Glass.
That is how it stayed until the end of the game and it was Elks goalkeeper Rebecca Davidson who was the hero of the hour when she saved from Speers and Vanessa Surgenor setting the stage for McCay to score the winner as the holders won the shootout 4-2 to march on in defence of their trophy.
There was more penalty stroke drama in Dublin as Railway Union and Ards also drew 1-1 at the end of full-time.
Chloe Brown's 41st minute strike from a penalty corner cancelled out Kate Dillon's opener for the home side.
After five penalties the two sides still couldn't be separated at 3-3 and so it went to sudden death with Kerry Harvey eventually ending the drama with the winner for Ards, 6-5 on strokes.
The two Ulster sides are joined in the semi-finals by Hermes who beat Ballymoney, the only non-All Ireland League side left in the competition, 4-0, and UCD who edged Loreto 1-0.
In the men's senior cup the only Ulster side left in the draw, Lisnagarvey, moved into the semi-finals with a 6-3 win at Railway Union.
Sean Murray's superb opening goal set them on their way with Matthew Nelson scoring twice and the other goals coming from Neal Glassey, Daniel Buser and Timmy Cockram.
Three Rock Rovers beat Cork C of I 2-1 while Glenanne came from behind to beat YMCA 5-3.
The other quarter-final between Pembroke Wanderers and Monkstown takes place on Sunday.