Poland

In Warsaw, The Cork Irish pub (al Niepodleglosci 19, Tel 022 8530061) shows a few international games, especially the Irish ones. Not a bad place at all but a bit of a trek outside the city centre. They have Sky digital and BBC digital.
 
Morgan's Irish pub (ul Okolnik 1, Tel 022 8268138) show a few games now and again, especially the Irish ones!

Champion's sports bar in the Marriot hotel (al Jerozolimskie 65/70, Tel 022 6305119) has a fair few satellite channels and show some games. You can phone them to ask if they are showing the game but the service is not too great and the place is expensive.

Find another place to watch rugby.