Endgame's main character, Arkady Ballugan, is a chess Grand Master who has been struck by agoraphobia after seeing his fiance murdered outside their Vancouver hotel. Arkady is hilarious and awesome, and each of the episodes has managed to believably mix chess, puzzles, and fun. It also has great guest stars (Peter Winfield! As a heavy-drinking Russian cosmonaut in private spaceflight! Who is AWESOME too!), along with a wonderful supporting cast.
I pretty much always love Canadian TV, but this one is a jewel, and clever, too.