If you're not familiar with Jamey Stegmaier of Stonemaier Games (Viticulture, Tuscany, Euphoria, and other games), I highly encourage you to check out his blog:
http://stonemaiergames.com/the-compelling-power-of-solo-play-for-tableto...
A guest writer, Morten Monrad Pedersen provided two excellent posts (with a third and fourth coming soon) on how to build solitaire rules into your game design.
First Entry:
https://boardgamegeek.com/blogpost/37830/automa-approach-method-making-s...
Second Entry
https://boardgamegeek.com/blogpost/37886/automa-approach-guidelines-and-...
Cheers,
Joe
I ran across the links today in response to one of Jamey's posts. They read quite well, and thought best to share them with the broader community as the designer doesn't know about BGDF, though I've invited him now to join.
I've read through the rules and look forward to play-testing this one. One of the things that I've found since getting into this industry is that you can actually have too many good ideas...and it takes the will to decide what stays and what must be shed.
Anyway, I'm glad the links helped you, my friend.
Cheers,
Joe