Half time here in Belfast.

Zebre lead by three after a low scoring but action packed first half.

The conditions have improved but the game has been marked by errors.

Back-and-forth action but neither side has been able to impose themselves on the game.

Frustration for the hosts, but credit must go to the Italian side for their defensive performance so far.

A penalty from Zebre's Giovanni Montemauri is all that separates the sides at the break.

Ulster's defence stands firm against a good passage of play from Zebre.

The hosts have the ball back and a series of carries brings them up to the halfway line.

Zebre receive a kick and put it in touch to end the half.

A breathless first half despite the low score!

Zac Ward and Jack Murphy deal well with a kick deep in their 22.

The out-half clears the ball with a massive kick to the halfway line.

Zebre win the lineout and attack with intent in Ulster's half.

Zebre number eight Giovanni Licata picks from the base of the scrum and draws in a number of Ulster defenders.

The visitors win a penalty and kick for touch.

Lineout to Zebre just inside their own half.

Zebre turn the ball over close to their line and clear the ball but Ulster run it straight back.

An incisive backs move comes to and end as Nick Timoney knocks the ball on.

Ulster struggling to click in the difficult conditions.

Tony McWhirter
1999 Ulster European Cup winner on BBC NI

There wasn't much room for Stewart to have a crack at that.

I didn't hear the call to use it either. Stewart might have been better waiting for Ward and Postlethwaite to join the back of the maul.

The flanker Bautista Stavile Bravin is deemed to have illegally intervened from an offside position and is shown a yellow card.

Penalty to Ulster in a good position.

Ulster surge forward and as John Cooney looks to go wide the ball comes off a retreating Zebre player.

The match officials are reviewing the passage of play to determine whether the intervention was cynical...

Zebre get the first points on the board with a penalty on front of the posts from out-half Giovanni Montemauri.

Unsurprisingly given the conditions, there have been plenty of errors so far.

Both sides are struggling to get a foothold in the game but Zebre's dominance at the scrum has given them the upper hand.

Andy Gray
BBC Sport NI at Kingspan Stadium

As you would expect with the weather conditions, this one hasn't been great. The downpour has developed into heavy mizzle.

Ulster look the more likely to make something happen but errors at key moments have stopped them getting on the board.

As a side note, Nick Timoney must be one of the most unlucky players when it comes to Ireland selection. He's been superb so far, as he often is.

Zebre have another penalty for an infringement in the ruck and the visitors will once again kick to the corner... but the ball has gone dead.

It's a scrum to Ulster however Zebre put them under a lot of pressure.

The ball is fumbled at the base and Zebre turn it over and launch an attack.

Ulster win a lineout and Jude Postlethwaite crashes the ball up in midfield.

Scott Wilson with a strong carry but Zebre have won a penalty for holding on to the ball in the tackle.

Zebre kick for touch into Ulster's half.

Zebre with a lineout deep in Ulster's 22.

Ulster turn the ball over close to their own line and a hack clear sends the play back to the half way line.

The hosts now have a lineout just inside Zebre's half and Tom Stewart steers the maul forward with ball in hand.

A probing kick from Zebre sends Ben Carson chasing back and he gathers the ball but slides his foot into touch.

End to end stuff in Belfast.

A chaotic spell of rugby, but there's now a brief bit of respite as a Zebre player receives treatment for an injury.

Tony McWhirter
1999 Ulster European Cup winner on BBC NI

The game has really come to life.

It looked like Ulster were going to rumble that over but a turnover on the line.

Zebre with the counter-attack and their kicking game has been brilliant.

It's knocked on by Ulster and Zebre clear their lines with a kick deep into Ulster's half.

Frustrating for the hosts but great defence from the Italian side.

Ulster pummelling the Zebre line but the visitors holding their discipline in defence.

Can Ulster make it over the line?

Another lineout for Ulster on Zebre's 5 metre line.

The maul is making good progress and John Cooney throws the ball wide...

Penalty to Ulster for an infringement from Zebre at the ruck.

They kick for touch and Ulster win their lineout and the resulting maul rumbles forward.

The hosts with a series of carries into Zebre's 22.

However a knock on means the referee brings it back for an earlier penalty.