Shifting Connection games

After last Friday's post, reader Nick Bentley suggested playing again but allowing each player to not only place a new piece, but also shift an old piece each turn. Ernie and I easily spent all of our Monday meeting trying this out. Here's one of those games. During the game, we had a lot of questions about what was legal (e.g. declining the shift, etc). Hopefully Nick can answer those for us!

This really changes the game! You can see one point where I was about to lose because I hadn't anticipated the power of the shift. Ernie was nice enough to let me go back... :-D

Nick suggested another game to play, and then another reader, Marcos, suggested his own game. I guess Ernie and I have plenty on our plate! :)

I'm really interested in playing the shift version of Hex. Or the shift version of Adjex! Is there some ruleset to combine this with an adjacency restriction?