That's a game on words which only works in German, so let me explain: in German we use 'to concrete' when the goal is blocked, when a team is only trying to prevent the other team from scoring, rather than trying to score for themselves.
So very well, today we finally saw a match where not even both teams desperately tried to win the game but that also both had plenty of chances to achieve this. And even though the defences of both Cameroun and Danmark only made this possible (with a great number of individual mistakes), this game still was very much watchable. What a pity that we won't see much anymore of Cameroun - in this championship.
(Oh, and this concrete building by the way is Wotruba Church, in the district of Liesing. Actually not that beautiful if you ask me, ugly even I would say.)