Derry were dominant in all sectors in the opening period, with James Kielt particularly impressive at midfield.
Despite the two goals, there was a lack of finesse in the opening period.
Defender Craig Liddle had given Darlington the advantage at half-time after a frenetic opening period.
Home fly-half Gareth Owen kicked two first-half penalties to rival Dan Parks' single opening period shot.
Parra converted with the final kick of the opening period to tie the scores 13-13.
After a tense, goalless opening period, Matt Foord put the home side ahead from close range.
Both sides conspired to waste every meaningful attacking opportunity in an opening period riddled with basic errors.
It was a hammer blow to a Pompey side who had competed well in the opening period.
Despite that early setback, Palace looked the more dangerous attacking side for much of the opening period.
It was the high-point of a 25-minute opening period in which Liverpool dominated possession but created few real goalscoring chances.
But after a difficult opening period the West Ham man turned the tables as he put Wales ahead.
Bristol paid for their indiscipline in the opening period with a grateful Mercier slotting over another four penalties.
BBC: SPORT | Rugby Union | English | Bristol 9-41 Gloucester
Anthony, who leads the NBA in first-quarter scoring, came out hard with 11 points in the opening period.
Detroit opened the scoring with a shorthanded goal 6:33 into the opening period.
The Canadiens' failure to clear the puck from their zone led to two Buffalo goals in the opening period.
The match enjoyed a particularly lively opening period, during which both teams had clear chances to open the scoring.
Skipper Thierry Dusautoir touched down in each half for the hosts while Vincent Clerc also crossed in the opening period.
All this happened as Boston hit just four of their 16 first-quarter shots, en route to a 10-point opening period.
Nottingham had a goal disallowed by referee Dave Cloutman in the final minute of the opening period for high sticks.
Everton, understandably, named the same side that thrashed Sunderland 7-1, but they showed little of that sparkle in the opening period.
The match was more even in the second half, with the two defences looking much less charitable than the opening period.
Tactical kicking and determined chasing largely defined both sides' efforts throughout the opening period and that was also how the second-half went.
Louisville was 5 of 14 (35.7 percent) and Syracuse 5 of 11 (45.5 percent) from beyond the arc in the opening period.
London absorbed the pressure in the opening period but finally succumbed to a pair of goals from Lee Jinman in the second.
However, British and Irish Lion Jones ensured his side a 10-6 half-time lead as his first successful penalty shot ended the opening period.
The opening period in Cardiff was tense, tight and dominated by tactical kicking with neither side able to prise open the opposition defence.
After a dire opening period, David Connolly's 14th goal of the season eight minutes from time looked enough to condemn Stoke to defeat.
Bournemouth kept Boston on the back foot throughout the opening period with Hayter and Wade Elliot going close to extending the visitors' lead.
The opening period suggested it would go to plan with Roma keeper Doni kept busy by shots from Deco, Florent Malouda and Frank Lampard.
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