Seems to have a bug as at least this scenario should be solved but not

[kwccoin]

[kwccoin]

A lot of cards seem missing from the pile and hence unsolvable.

BTW have to be very careful in putting the card otherwise sometimes card disappear or just put in the top with cover. But for this scenario, none of this happen and hence I thought I solve it !!!! No error message in the Xcode log ...