Are the Republic of Ireland heading for Euro 2016? Martin O'Neill's side are not there yet but they have taken a big step to confirming their place at next summer's tournament. Join us on Monday to find out whether they can finish the job against Bosnia and join Northern Ireland, England and Wales in France. Until then...
- Brady gives Republic lead & away goal
- Dzeko replies from eight yards out
- Away goals count double in event of drawn tie
- Match being played in thick fog in Zenica
- Return leg in Dublin on Monday
Republic of Ireland defender Ciaran Clark: "It was very foggy out there, especially in the second half. But it was the same for both teams. That's half the tie done and we've got to get ready for Monday."
Bosnia-Herzegovina keeper Asmir Begovic: "We couldn't quite get the ball down and play the way we wanted. The weather made it difficult, the fog made it tough. It was a tight game and it's all to play for on Monday."
At least the weather forecast for Dublin on Monday does not include fog...
A terrific shift by Martin O'Neill's battling players. It means a goalless draw in Dublin on Monday will be enough to send the Republic of Ireland to Euro 2016.
Jeers ring out from home fans once again as Ireland are in no hurry to take a free kick deep inside their half. More vital seconds eaten up.
This was never going to be a classic because of the high stakes but Ireland are moments away from heading back to Dublin with an away goal and a fine result.
Another change for Bosnia. They're going for this...midfielder Izet Hajrovic for Senad Lulic. Four additional minutes to be played.
Let's be clear about this. A 1-1 draw away to Bosnia will still be a very good result for Ireland to take back to Dublin for Monday's deciding leg.
A game of few chances suddenly bursts into life, Edin Dzeko side footing Bosnia level from seven yards after being icked out by substitute Ognjen Vranjes. Ireland have six minutes to hang on in the Zenica fog.
Can you believe it? Ireland have the lead as Norwich City midfielder Robbie Brady skips past Toni Sunjic before firing home from the edge of the penalty area to send 800 travelling fans delirious. A huge moment.
Darren Randolph might be 28 but he is still a rookie when it comes to senior international action. The West Ham keeper has done everything asked of him in Zenica and commanded his area well. He's just over 10 minutes away from a clean sheet.
Huge noise from the home fans as forward Milan Duric comes on. That's three strikers on the pitch for Bosnia. What is puzzling is that Edin Visca - one of their best players on the night - is hauled off.
This fog is not going anywhere fast. Apparently if the game is stopped then the remaining minutes will be played on Saturday or a time agreed by both associations. Twenty minutes remaining.
Here comes Ireland's second change of the night - Stoke defender Marc Wilson replaces Burnley's Stephen Ward.
Excellent photograph from our man in Zenica.
Ireland are producing a fine rearguard display. Bosnia have had most of the possession since the re-start but they are struggling to unlock a solid back four. Ireland's fans are getting louder and louder as the home supporters become more and more frustrated.
Farcical scenes. Ireland's white shirts are just - just - about visible. The German referee is just about visible - and he's wearing a bright yellow top.
Here comes Ireland's first change. On comes midfielder James McClean for Wes Hoolahan.
Will this game finish? What happens if the referee is forced to stop the match because of the fog? Just over half an hour of normal time remaining.
A Bosnia attack results in Ciaran Clark just about getting the ball back to Darren Randolph before the hosts can cause any serious damage. Bosnia have made a change - defender Ognjen Vranjes on for Mensur Mujdza.
Meanwhile, the fog is getting worse.
BBC Radio 5 live in Zenica
A very thick blanket of fog has come and covered the stadium. I can just about make out the flag on the left hand side. This game could be in jeopardy if it gets any worse
No changes by either side. Early chance for Ireland but skipper Glenn Whelan lashes the ball horribly wide from just outside the area.
This fog...it could yet become a problem.
What has happened to the weather in Zenica? The fog has come down quickly during the interval. Back under way...
James McClean doing some intense drills on the pitch during the half-time interval. An Ireland change at the start of the second half? The visitors are out early for the start of the second half and are made to wait a few minutes for Bosnia to appear.
The play-offs are well and truly under way, Hungary taking a step towards their first major tournament in 30 years with a first-leg win in Oslo on Thursday.
Debutant Laszlo Kleinheisler was the match-winner, smashing in an early goal from 15 yards.
On Saturday, Sweden entertain Denmark and Ukraine host Solvenia.
All you need to know about the Euro 2016 play-offs can be found on the BBC Sport website.
Ireland need to keep their discipline. Stephen Ward has already been booked while Ciaran Clark's sliding challenge on Mensur Mujdza at the end of the first half nearly sparked a mass coming together. But it's a case of so far so good. Martin O'Neill will take a goalless draw back to Dublin and hope some of his injured players are available for the return leg on Monday.
The referee has had enough, No added time at the end of an uneventful first half. Ireland will be pleased with how things are panning out in Zenica.
They kept a clean sheet against world champions Germany last month and Ireland are doing a good job containing Bosnia in their own back yard. Edin Dzeko has hardly threatened while Miralem Pjanic has been limited to a couple of half chances. This is by no means a classic but the Republic are doing an effective job in Zenica.
Jeff Hendrick wins Ireland a rare corner. It's a low delivery but Glenn Whelan loses possession too easily and Bosnia clear. The Republic are lacking belief in the final third.
Another close shave for Ireland as Senad Lulic narrowly fails to deflect Ervin Zukanovic's header beyond Darren Randolph. The faintest of touches by Lulic and that was going in.
An encouraging spell of possession for the Republic. For the first time it's gone quiet inside the ground. Seamus Coleman is trying to get forward and Wes Hoolahan is working hard to create an opening. Bosnia look edgy at the back. So far so good for the visitors.
Martin O'Neill's side have yet to craft an opening. The Republic boss will not be too concerned by that right now as his defenders are doing a decent job at the other end. First booking of the game goes to Stephen Ward after a cynical tug to stop Edin Visca, who is everywhere.