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How much space do you have and how many figures? How much time do you have to learn new rules - short trip and simple rules or long stay and something complicated).I find Dragons Rampant is Ok for solo gaming due to the activation system. Possibly Hail Caesar with a fantasy twist could work. Do you have time to work out how to play Rally Round the King?
TwoHourWargames Swordpoint? You can ditch the bits you might dislike, I like the randomness it adds.
I solo game with Two Hour Wargames' "Talomir Tales - Distant Shores" game (though they have a couple of similar games as well). It's basically a warband level game with your "Star" and cast of Grunts. The system generates all your missions and encounters for you, including NPC interactions, linking into a campaign system in which you can improve your figures' capabilities (or see them degrade if they have bad combat results).http://www.twohourwargames.com/fantasy.htmlHere's a scenario report. Full disclosure, I like the system so much I wrote a scenario book for them! My son was really into the Redwall series by Brian Jacques, and I wanted to do some gaming with him. DnD doesn't do solo or co-op/non-GM gaming very well, and he didn't like being one player against the Dad GM. But this system does do solo and co-op gaming very well. So I made up a campaign for him using the THW rules with his character as the Star and I played a supporting character in the Group he put together. I shopped the idea to THW, and they liked it enough to publish it as "The Druid's Children" (with permission from Splintered Light, who make great minis for a Redwall type of game). Anyways, here's a game report:https://sbminisguy.wordpress.com/category/fantasy-gaming/talomir-tales-thw-fantasy/