Limavady Grammar defeated Down High in a delayed in a delayed Northern Bank Ulster Schools' Cup third round replay.
Earlier, Ballyclare HS defeated Cambridge House 27-7 in a rearranged third round tie.
Meanwhile, holders RBAI will face Campbell College in the fourth round while Wallace face Omagh Academy.
In other third round ties, Rainey beat RS Dungannon 7-0, Grosvenor saw off Belfast HS 16-3 and Down and Limavady drew 3-3.
Omagh Academy beat Portora Royal 8-3 and Coleraine Inst won 8-0 at Foyle and Londonderry College.
Third round results
Royal School Dungannon 0-7 Rainey Endowed
Grosvenor Grammar 16-3 Belfast High School
Omagh Academy 8-3 Portora Royal School
Foyle & Londonderry College 0-8 Coleraine AI
Banbridge Academy 18-6 Portadown College
Cambridge House 7-27 Ballyclare High School
Regent House 17-0 Carrick Grammar
Down High School 3-3 Limavady Grammar (Replay: Limavady 17-14 Down High).
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