First of all thanks for the feedback. I highly appreciate it, that you took your time to help me with some suggestions 😊👍
For the vertical chess l, yes I'll put that on my Todo list, you are not the only one wanting this.
For Tamerlane variant, I have to say it is sadly not possible for this game. I use a stockfish implementation, which only supports standard chess.
When I someday have finished this project, I have already planned a second game with more variants but a weaker self build AI.