I already explained why Artur is playing well.
Here we go again . Artur spent some time getting ready for Euro 2016 , he was working with top goalkeeping coaches in Poland , his training partners were Fabianski ,Sczesny not Federici and the other guy. I'm sure he was disappointed by not being able to help team Poland in France .
Personally I think he should be in net for penalties vs Portugal.Funny Fabianski saved pk today as well.
Basically, training with national team for weeks does Boruc much better than club training.You have to remember Poland is starting World Cup qualifications starting with Kazakhstan. Nawalka called him up. Szczesny is doing just OK , Fabianski is fine , but is he better than Artur?