In the semifinals at the University Oval on Saturday, Alhambra-Union beat Kaikorai 16-8 and Dunedin beat University A 20-10.
The Dunedin club was formed in 1871 and Union in 1872.
Alhambra (1884) combined with Union in 1987.
Openside flanker Matt Clutterbuck was the star for Alhambra-Union, while goal-kicking winger Tom Halse, a former member of the Auckland Grammar 2nd XV, kicked four goals from five attempts for Dunedin.
Alhambra-Union won the combined clubs first banner two years ago and Dunedin won its ninth banner in 2005.
Southern won the play-off for fifth and sixth when it beat Harbour 14-10.
Leading points-scorers are: Lewis Hancock (Southern) 155, Luke Reihana (Alhambra-Union) 115, Peter Breen (Zingari Richmond) 109, Glenn Dickson (Pirates) 105, Andrew Reid (Kaikorai) 99, Chris Noakes (University A) 93, David Thompson (University A) 75, Tumua Ioane (Dunedin) 70, Shaan Davis (University A) 70, Ben Smith (Green Island) 60, Ben Pereira (Alhambra-Union) 55, Craig Sneddon (Pirates) 52.
Dunedin 20
University A 10
Dunedin heeded the half-time instruction from its coaching staff to play smart and controlled rugby in the second spell to beat University A 20-10 at the University Oval.
The students had scored two first-half tries from Dunedin mistakes and the game was even at 10-10 at the break.
Earlier, Dunedin had score a converted try to lead 7-0.
There was power in the students' scrum and they dominated the set pieces by timing the shove to perfection to shunt the Dunedin pack back during the game.
Powerful tighthead prop Sam Hibbard was the best tight forward on the paddock, and he was backed by hooker Simon Forrest and locks Ash Johnson and Josh Townsend.
The first student try, after 24min, came when the Dunedin pack was pushed back in the scrum.
The ball was kicked downfield, fullback Fraser Hunter misjudged it and second five-eighth Andrew Parata pounced on the ball over the line.
Another mistake by Hunter 3min later gifted the students another try when flanker Kieran Williams charged down a clearing kick.
The students looked ready to tear the game apart and win comfortably.
The pack backed up its scrum with line-out dominance.
The students had four line-out options, and Johnson and Townsend each made five clean takes.
Townsend's driving runs and strong tackling were also a feature.
But the students lacked a reliable goal-kicker; Shaan Davis missed his three shots at goal. Dunedin goal-kicker Tom Halse landed four goals from five attempts to score half his team's points. The students experienced a major setback just before half-time when captain Williams left the field with a shoulder injury.
The second spell was dominated by the Dunedin loose forward trio of Scott McKee, Richard Naylor and John Crossan.
They pressured the student backs and hit them behind the advantage line and forced mistakes.
For the first 15min of the second spell Dunedin camped in the student half, applying constant pressure.
The backs joined in with a strong defensive effort to neutralise any ball won by the students in the set pieces.
The reward came after 16min when the Dunedin backs ran the blindside from a scrum inside the 22m and centre Sam Scown used his strength to crash over wide out to score his second try.
First five-eighth Josh Hamilton played a key role with his tactical kicking by putting the ball behind the student backs to create pressure and force mistakes.
The second half was noteworthy for the numerous mistakes made by the students.
They had few opportunities to attack and a turnover inside the Dunedin 22m proved costly.
The ball was booted into the student half and when a penalty was awarded a minute later, Halse kicked the goal to extend the margin to 10 points with just 11min left.
Dunedin 20 (Sam Scown 2 tries; Tom Halse 2 conversions, 2 penalty goals), University A 10 (Andrew Parata, Kieran Williams tries).
Half-time: 10-10.
Referee: Tim Baker.
Alhambra-Union 16
Kaikorai 8
Matt Clutterbuck, the forgotten man of Otago rugby, played a key role in Alhambra-Union's 16-8 semifinal win against Kaikorai at the University Oval. The Kaikorai forwards played well as a unit and the strong-tackling midfield of Mark McGregor and Matt Direen pressured Alhambra-Union into mistakes in the first spell.
The Kaikorai pack had the edge in the scrums and drove as a unit into the second phase play after flying openside flanker Andrew McDonald had secured the loose ball.
The game had reached a stalemate with both sides making handling mistakes with the wet ball.
The score was 3-3 when Clutterbuck changed the game.
Kaikorai won the scrum and Clutterbuck intercepted a pass at halfway and sped 40m down the touchline.
Alhambra-Union scored from the scrum and went into the break with a 10-3 lead.
This seven-point lead was crucial, with the wet conditions making it difficult for Kaikorai to come back into the game.
Alhambra-Union remained patient and did not rush its game. Clutterbuck's astute reading of play also helped Alhambra-Union on defence when he gathered the ball as Kaikorai was attacking inside the 22m in the second spell.
Second five-eighth Luke Reihana had a strong game and scored all Alhambra-Union's points with a try, conversion and three penalty goals.
He kicked four goals from his seven attempts.
His penalty goal after 12 minutes stretched the margin to 13-3 and a late penalty sealed the game.
Kaikorai lost the edge it had in the tight exchanges and set pieces when its captain and lock, Dan Joblin, left the field after 16min in the second spell.
The Alhambra-Union forwards steadily gained control after this, with prop Dane Mariki and hooker Ben Pereira having strong games.
Kaikorai was pinned inside its own half for long periods.
But a counter-attack by fullback Richard Cowley gave Kaikorai a scoring chance.
First five-eighth Andrew Reid kicked across field and Direen scored wide out to reduce the gap to five points after 23 minutes.
Accurate tactical kicking by first five-eighth Jone Paumau and strong tackling by Clutterbuck and fellow flanker Waharai Waitohi helped Alhambra-Union keep control in the final 15 minutes.
Alhambra-Union 16 (Luke Reihana try, conversion, 3 penalty goals), Kaikorai 8 (Matt Direen try; Andrew Reid penalty goal).
Half-time: Alhambra-Union 10-3.
Referee: Ross Barnett.
Southern 14
Harbour 10
Southern won the play-off for fifth and sixth when it beat Harbour 14-10 at Bathgate Park.
It was a scrappy first half, with Harbour taking the initiative and attacking through fullback Nalu Tuigamala and centre Ben Marshall.
Strong games were played in the pack by lock Trent Sutton and prop Dave Smith, who was having his 121st game for the club.
Harbour flanker Jason Kelly scored two tries and impressed with his support play. The second half belonged to Southern, with midfield back Luke Herden and prop Warren Moffat having strong games.
Loose forwards Sam Crompton and Ollie Spence had outstanding games, while stalwarts Dane Grey and Luke Eketone did their bit in their final games from the club.
Halfback Ryan Hammer had a lively game in the second spell.
Southern 14 (Sam Crompton, Dave Ogilvie tries; Hamish McKenzie 2 conversions), Harbour 10 (Jason Kelly 2 tries).
Half-time: 7-5.
Referee: Jeff Grubb.
Countrywide competition
Zingari Richmond 18
Pirates 16
Hooker Mason Pomare was the stand-out player for Zingari Richmond as it came back strongly in the second spell to beat Pirates 18-16 at Hancock Park in the Countrywide competition.
Ben Kent had a strong game in the midfield and Campbell Cuthill was an attacking fullback.
Glenn Dickson kicked four goals and 11 of Pirates' points.
Zingari Richmond 18 (Timoto Halipali, Hamish Cooper tries; Campbell Cuthill conversion, Peter Breen 2 penalty goals), Pirates 16 (Craig Sneddon try; Glenn Dickson conversion, 3 penalty goals).
Half-time: Pirates 10-6. Referee: Mike Woodhouse.
Green Island 20
Lawrence 7
After the score was tied at half-time, Green Island came away in the second spell to beat Lawrence 20-7.
Green Island dominated in the second half, especially in the forwards.
It put pressure on Lawrence, and caused errors, which it converted into points.
For the winner, centre Mark McIlroy was outstanding, while in the pack, Frank Campbell and No 8 Simon Muir had strong games.
Marc Ellison was the difference; he scored 10 points with his boot, two penalties and two conversions.
Lawrence made mistakes and paid the penalty.
Lex Kaleca in the backs and Mark Homer in the forwards were the best of the Lawrence side.
Green Island 20 ( Mark McIlroy, Mike Cross tries; Marc Ellison 2 conversions, 2 penalty goals), Lawrence 7 (Joe Maitioro try; Sam Young conversion).
Half-time 7-7.
Heriot 23
University B17
Heriot can thank Welsh winger John Phillips for his afternoon's work, as he scored all his side's points in its 23-17 win over University B in their game at Heriot.
Heriot led 18-0 at half-time and looked set for a good win, but University B came back strongly in the second half to close the gap.
Phillips scored three tries, two penalties and one conversion, and looked in top form.
Andrew Kirk at halfback played well for Heriot.
In the forwards, Blair Young and Tim Jordan competed well for 80min.
University B looked unsettled in the opening spell, but came back strongly in the second half.
Its fullback, Peter Grant, had a fine game.
In the forwards, Paddy Ryan and Richard Te Nahu stood out.
The last time Heriot played University B was in 1958 at Heriot.
Heriot 23 (John Phillips 3 tries, conversion, 2 penalty goals), University B 17 (Paddy Ryan, Jay Cootes, Eli Manu tries; Peter Grant conversion).
Half-time 18-0.
