Great entry into the jam. I hope you'll extend on it. Some thoughts: I agree with Djack that hopping walls isn't really appropriate for the bishop. It fits the knight, but bishops usually can't jump over things. Instead you could extend the turner-things idea, as Naomi suggested. For the bishop you could instead introduce shifter plates, that move the bishop one field horizontally or vertically, so that he can access the other diagonal.
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Thanks for your feedback! To be honest I haven't play chess for a long time and I didn't realize that bishop cannot jump over other figures. Now I see it is confusing. My bad...
Bishop's part is made in hurry. I just wanted to have more than one promotion in the jam version.. maybe the knights part would be enough for the jam entry. And if the bishop wouldn't jump over the wall, without introducing another mechanics like shifter plates you talked about (good idea btw.), this part would be absolutely straightforward.
Anyway, all feedback is really appreciated and I will definitely use it in extended version in the future.
Thanks a lot!