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.