Unfortunately that's a question I can't answer; it's the publisher's task to provide a solo mode option in a game, because it takes quite some work (and usually extra components) to develop something like that. Some publishers even hire third party companies to design the solo game. For now, all I can suggest is: give yourself a limited number of cards - if you don't reach the other camp before the cards run out, you've lost the game. Maybe a rule on how if you encounter a certain object you are allowed to add a card to the deck?
i know this is by at least two players. is it possible to develop an algorithm to make it solo mode?
Unfortunately that's a question I can't answer; it's the publisher's task to provide a solo mode option in a game, because it takes quite some work (and usually extra components) to develop something like that. Some publishers even hire third party companies to design the solo game. For now, all I can suggest is: give yourself a limited number of cards - if you don't reach the other camp before the cards run out, you've lost the game. Maybe a rule on how if you encounter a certain object you are allowed to add a card to the deck?