A good starting point for segues are Stanford CS193p class lectures 6 and 7 in the fall of 2011.
http://itunes.apple.com/us/itunes-u/ipad-iphone-application-development/id473757255
The instructor, Paul Hegarty, covers everything. However, he runs out of time before the end of the class to answer this question. It includes the source with the final decision in the file: Psychologist with Dr Pill.zip.
http://www.stanford.edu/class/cs193p/cgi-bin/drupal/downloads-2011-fall
Basically, all you need to do for this question is to drag Ctrl from each UITableCell to the respective controllers for viewing detailed games, and then select "Replace segue". There is one more step, because the view controller will shrink, because by default, Xcode considers that you want to replace the main controller. For each of the segments, select a connection line and an attribute inspector, then change the destination of the Split Wizard to Detailed Separation. At this point, you can test with popover without writing any code.
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