Drink Responsibly, Don't Spill
is that a black and tan!?
Nope, that is a rezane pivo - similar concept to a black and tan, but made with a Czech pale lager and a tmave.
tmave is a Czech dark lager, similar yet distinct from both a Dunkel and a Schwarzbier.
i missed so much when i went to prague and stuck to pretty much Krusovice!
In that case you need to get back there! And of course you need a good guide to the pubs of Prague:http://www.lulu.com/product/ebook/pocket-pub-guide---prague/14698398