takjas: Yes, all is understanding.
We played a test game. In the position Dameo (Jaak vs. takjas) followed
5. d4xd6xb6xb8xd8xd6 c5xc3xc1xe1xg1xg3
There are white pawn in d6 and black pawn in f3. It is correct here. By the same rule in Dameo (takjas vs. Good Luck :)FLR) it must get white queen in b8 or f8.

Jaak: try to isolate the problem: make a position with possible jump like d4-d6-d8-b8 but without a pawn on e8, and without a continued jump from b8. Would that work?

Again, this is all just curiosity. There is a bug, yes, but there is no one on brainking to correct bugs.

rabbitoid: We played some test games.
In the final position Dameo (Jaak vs. takjas) there is black queen in G1. Perfect!
Dameo (Jaak vs. takjas) there is black queen in E1 and pawn G2 didn't made the move wrong. Excellent!
So I see that Dameo rules are right in BrainKing. However possible that in Dameo (takjas vs. Good Luck :)FLR) the pawn B4 made this bug. White get queen but cannot finish the move as a queen. We try more test games too.

takjas: The bug repeated in the position Dameo (Jaak vs. takjas) . If I click my pawn d4, it jumps to d8 and becomes a queen. I cannot continue jumping neither to b8 nor to f8. I see red text "Finish the move by clicking on one of submit buttons. You can write a message for your opponent." but if I click the button "Move", I get the GameList and the move is NOT done.
We saw that in other test games it was all correct but what can be the reason here?
Maybe two ways after d8 - b8 and f8.
Maybe there is conflict rules: white have a queen but cannot finish the move as a queen neither d8xb8xb3 nor d8xg8xg6xg3 - they are incorrect moves.

takjas: We found the reason of this bug! Exactly the same happened in the test game Dameo (Jaak vs. takjas)
Here black get a queen in E1 and cannot capture neither to C1 nor to G1, also cannot finish the move with a queen in E1. As a donkey dying of hunger between two haystacks!
Remember that it was correct with one "haystack": Dameo (Jaak vs. takjas)
Fencer , if you have time to solve this systematic bug then also Dameo (Jaak vs. takjas) is very good for testing while we have thinking time.
It's strange that the posts Checkers variants (8x8) (takjas, 2018-09-26 09:22:46) and Checkers variants (8x8) (Hexis, 2018-10-22 20:10:27) are not in this thread.