Postpublished at 11 mins
Chile's Arturo Vidal and Portugal's Bruno Alves clash on the edge of Portugal's penalty area. It threatens to kick off - it often does with Vidal - but simmers down and nobody is punished.
Claudio Bravo saves all three Portugal penalties to put Chile into final
Chile face Germany or Mexico in Sunday's final
Vidal and Rodriguez hit the post for Chile at end of extra time
Chile denied clear penalty - VAR not used
Ronaldo close with two late chances in normal time
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Emlyn Begley
Chile's Arturo Vidal and Portugal's Bruno Alves clash on the edge of Portugal's penalty area. It threatens to kick off - it often does with Vidal - but simmers down and nobody is punished.
Another chance for Portugal but Andre Gomes shoots over from about 20 yards with Chile defenders closing him down. This is a pretty good game so far.
And now Portugal should lead. Cristiano Ronaldo crosses from the left and Andre Silva, about six yards out, shoots straight at Claudio Bravo.
Silva has joined AC Milan for about £33.5m this summer. I think they'll be expecting better finishing for that money.
Chile's first attack of the game and they should score. Alexis Sanchez plays a brilliant through-ball to Eduardo Vargas but he lets Portugal keeper Rui Patricio come out and close him down - and he saves it with his chest.
Vargas may have been offside so had it went in, we would have been using the VAR probably.
Bernardo Silva fires a free-kick from the left but it's passed everyone in the centre. Bruno Alves keeps the ball in play and crosses it to Cristiano Ronaldo, who heads wide. It was a difficult chance for the big man to be fair.
Excellent skill from Bernardo Silva to get free in midfield, he takes on a couple of Chile defenders and passes it to Andre Gomes, whose shot is straight at Silva's new club-mate Claudio Bravo.
Chile keeper Claudio Bravo gets the ball and he punts it up the field and out of play. Where was that famous footwork Manchester City signed him for?
Portugal 0-0 Chile
We are under way in Kazan.
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Fabian Pavez The Dre: Using VAR is like watching a game of football played on an Icy Pitch. Boring
Portugal boss Fernando Santos: "I always trust my team. I have unshakeable confidence. I'll go to the end of the world with these players.
"There are no two teams that play the same. Chile have quality players, are very dynamic and are very aggressive and combative.
"But we're descended from Portuguese, Lusitanic blood, we're warriors, we have a great capacity to suffer and have dedication to our people. So in that sense, we're equal on the field.
"It's not easy to understand how they play because they are very dynamic so we have to pay attention to their movements. They're not a traditional team. We're ready for that. We know their good points and like every team they have less strong points."
The music seems to have stopped for Chile's national anthem a bit early but the players sing on for a while longer.
National anthems time. Nobody for Chile giving it the full Ivan Zamorano effect from years ago.
Portugal midfielder Pizzi's nickname comes from Chile boss Juan Antonio Pizzi.
The 27-year-old Benfica player's real name is Luís Miguel Afonso Fernandes.
“When I was young, he used to play for Barcelona and he was right on top of his game. And when I began to score lots of goals, they started calling me Pizzi. I’d like to give him a hug, though I want the Portuguese Pizzi to be the one who makes it to the final.”
Chile coach Juan Antonio Pizzi played under Portugal coach Fernando Santos for FC Porto in 2000.
"We know it's going to be a difficult match," he said.
"And I'm sure it's going to be difficult for Portugal as well.
"It a privilege and reason for satisfaction to have all of the players at our disposal. Let's hope they are able to play at the same level as we've seen until now."
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Nikul11: Was all for it at first. Now, I fear it will ruin special moments and disrupt the flow of the game.
Agree? Disagree? Let us know
Chile will attempt to keep Portugal captain Cristiano Ronaldo away from the ball, says midfielder Marcelo Diaz.
Real Madrid forward Ronaldo, 32, has scored twice to help guide his country to the last four in Russia.
"We all know he's an amazing player, he's very dangerous and can decide a game alone," said Celta Vigo's Diaz.
"He has had an amazing season. He's playing here with the same strength.
"The main thing is trying to stop him getting the ball and scoring."
Why hasn't anybody else thought of this before?
For football fans of a certain age (ie me), Chile will always bring up memories of Ivan Zamorano and Marcelo Salas - in an age of fantastic South American strikers (you're picturing Gabriel Batistuta and/or Ronaldo right now, aren't you?)
But neither of those players are Chile's all-time top scorer anymore. It's now Alexis Sanchez, whose goal against Germany was his 38th - taking him above former Lazio striker Salas.
Zamorano is now joint third, with former QPR loanee Eduardo Vargas, who scored his 34th goal against Cameroon.
Unbeaten Chile finished second in Group B, behind Germany, to qualify.
They beat Cameroon 2-0 in their first game, with Arturo Vidal and Eduardo Vargas scoring in the last 10 minutes.
A 1-1 draw with Germany followed, Alexis Sanchez giving the South Americans the lead with Lars Stindl levelling.
And they had the same result against Australia, with Martin Rodriguez scoring the equaliser to clinch their knockout place.
Portugal emerged from Group A unbeaten as group winners, ahead of Mexico on goal difference.
They drew 2-2 with Mexico in their opening game, with Ricardo Quaresma converting Cristiano Ronaldo's pass and Cedric Soares scoring what looked like an 86th-minute winner before they were pegged back.
They then beat hosts Russia 1-0, with Ronaldo heading the only goal.
And they thrashed New Zealand 4-0 to reach the semis, with Ronaldo scoring a penalty and Manchester City-bound Bernardo Silva, Andre Silva and Nani also on the scoresheet.
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So we've seen video refereeing (VAR) in action. What do you think?
Would you like to see it used in the World Cup next summer? How would you improve it? Or would you just scrap the experiment and go back to the way it was?
Let us know using #bbcfootball or text us on 81111 (you can only text us if you're in the UK and please let us know your name and where you're from).