Chakart :)
https://www.chessvariants.com/d.betza/chessvar/trapdoor.html
https://www.chessvariants.com/crossover.dir/koopachess.html
Chakart :)
https://www.chessvariants.com/d.betza/chessvar/trapdoor.html
https://www.chessvariants.com/crossover.dir/koopachess.html