Bummer, I thought the explanation about indexes was adequate... Here's the corrected version with a lot of comments, I hope it's clear now? As the master of Maps vs Territory, you have to understand the difference between the indexes and contents very well ;)
no subject
http://www.codeskulptor.org/#user38_OiCqu46km465Xy6.py
(you still have to work on presentation, i.e. borders between cards, but it's a minor thing)