Postpublished at 17:48 Greenwich Mean Time 1 February 2015
Guinea, to be fair, do manage a nice moment here, Ibrahima Conte curling a delicate through-ball into the path of Boubacar Fofana, but the midfielder's shot is blocked. Four added minutes.
Bony heads in two goals, Gervinho with a third
Soudani stabs in for Algeria
Ivory Coast play DR Congo in semis
Ghana beat Guinea 3-0 earlier
Chelsea's Atsu scored twice
Ghana next play Equatorial Guinea
James Gheerbrant
Guinea, to be fair, do manage a nice moment here, Ibrahima Conte curling a delicate through-ball into the path of Boubacar Fofana, but the midfielder's shot is blocked. Four added minutes.
Nick Cavell
BBC Sport at Estadio de Malabo
"It is disappointing from Guinea. I was expecting them to try and push more and to try and harass Ghana and stop them playing football.
"The problem with Ghana is they usually play so well in the quarter-finals but seem to come unstuck in the semi-finals. I don't know if that is complacency, or a bit of arrogance, but it does seem to come apart for them at that stage."
Djibril Paye picks up Guinea's fifth booking of the day for a cynical handball. Into the final stages...
Second change for Ghana. Mohamed Rabiu replaces Afriyie Acquah.
Stick a fork in this one, it's done. Guinea look resigned to defeat and are not putting any pressure on the ball. Ghana are being allowed to coast home.
A swap for Guinea too as Francois Kamano comes on for Abdoul Camara. That's their last substitution.
Anderlecht midfielder Frank Acheampong is on in Ghana's first change. Two-goal hero Christian Atsu departs.
Another chance for Asamoah Gyan as Harrison Afful surges down the right and clips in a good near-post cross, but Gyan's header is wide.
Ghana are cruising through to the semi-finals, but does coach Avram Grant look happy? Does he heck. Glowering is the best way to describe his disposition on the touchlines. Will the former Chelsea boss begin to withdraw his star players to keep them safe for the semi-final?
Nick Cavell
BBC Sport at Estadio de Malabo
"Ghana boss Avram Grant has the opportunity to protect some of his players now. Atsu has cramp and Avram has the talent to bring on from the bench. He will want these guys rested and ready for the semi-finals."
Out of nowhere, a chance for Guinea. A cross is curled in from the right, Ghana keeper Razak Brimah flaps at it under pressure from Abdoul Camara, but the loose ball won't sit down for Ibrahima Conte and he slices his shot wide.
I'm told Brimah has only had six shots to save in the entire tournament and the underworked keeper certainly looked a bit shaky there.
Ski Sunday is on BBC2 right now and Guinea are going downhill fast. They concede yet another needless free-kick when Fode Camara chops down Andre Ayew in the corner. Asamoah Gyan is then allowed a free header from Wakaso Mubarak's delivery but he misses the target.
Thierry Nyan:, external Atsu proving why he is a Chelsea player and his accolades in Holland last season. Still drooling over that screamer.
Guinea's Boubacar Fofana brings down Andre Ayew and receives a yellow card. It looked harsh, but it matters little now.
The intensity has gone out of this game like air from a pricked balloon. Guinea stand off as Ghana pass the ball around on the edge of the area and then let Wakaso Mubarak blasts one over from range.
Kwabena Bekoe:, external What a screamer! Whole of Ghana screamed.
xdeemuiz MUFC:, external Christian Atsu. Take a bow.
DJ socke23:, external What a Goal!!! #Atsu #GHAGUI. Now they show they are the best African team!
Guinea's last quarter-final appearance at this tournament ended in a 5-0 shellacking by Ivory Coast in 2008. This could yet be as bad. Can Michel Dussuyer's salvage anything from this match?
Nick Cavell
BBC Sport at Estadio de Malabo
"What an absolutely incredible goal. It looked like there was nothing on, it looked like he was shaping up for a cross but he whipped it into the top corner. That really was a goal out of nothing. Incredible goal. I'd say it is the goal of the tournament so far."
This is a goal that will have Chelsea fans licking their lips. Christian Atsu receives the ball wide on the right flank, cuts inside his full-back onto his left foot and unleashes a bending, dipping peach of a shot which sails over the goalkeeper and nestles in the top corner. Brilliant, and surely decisive.
What a waste. Rahman Baba brings down Guinea skipper Ibrahima Traore to concede a really promising free-kick on the edge of the box, but Traore steps up and lofts it over the bar. Guinea desperately to find some quality here.