Following up on your discussion of parameters, when I set the
following --freecells-num 0 --empty-stacks-filled-by kings --sequence-
move unlimited and entered this board

8S 2H 9S 6D 5C 7S 8H
JC 2S 5H 7D TC 4D 2C
KC KH 4C 5S AC 3D 9C
KS 4H QD 2D 6S 8C AS
7C TD JS TH JD 7H
TS 3S 8D 3C 4S KD
9H 6C 5D AD QC AH
QH JH QS 3H 9D 6H

fc-solve could not solve this game.

This is a board I could solve on my own using Freecell Wizard, an
extension of Pretty Good Solitaire which allows you to set your own
parameters.
It looks to me that fc-solve is not setting the sequence-move to
unlimited- you get the same result when sequence-move is limited.
I do know that the sequence-move unlimited parameter works if the
empty-stacks parameter is not used ( or same as filled-by all ).

Any thoughts?

Thank you,
larrysan45