If you have lands or troops left, yes, you could retire the game for a solo victory.
But if you have lost all your lands or all your units are gone, no, you can't.
Hope this helps.
I have noticed that one of my (defeated) archived game is still running without any active player.
Is there any way that I can get back into that game and play? 
If you have lands or troops left, yes, you could retire the game for a solo victory.
But if you have lost all your lands or all your units are gone, no, you can't.
Hope this helps.
Thank you very much.
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