In my Gothic Checkers game ( Gothic Checkers (didero vs. mirari) ), I was expecting to be able to move 17... e5xg3xe1xc1 - but when entering the move, it stops upon reaching the king's row (after e5xg3xe1).

If this is the intended way for Gothic Checkers to work, the rules needs to be made clearer, as this is different from all other checkers variants I am familiar with - generally, either a piece is only crowned at the end of its move (after all possible jumps have been made), or, in the case of Russian checkers, is allowed to immediately continue jumping as a king - I can't think of any other variant where the piece's movement is halted while there are still available jumps to be done as a man.