[FEN "1r4k1/4rp2/3K1B2/1p3q2/8/N1P5/PP2P3/3R1R2 b q -"]
can you solve ?
bug 1 what is this ??
bug 2 black screen ( study )
Bug 1 is caused solely because you left Black's ability to queenside check-marked when creating that FEN (as demonstrated by the lowercase q in the FEN).
Not too sure about the cause of Bug 2, though.
It's bug black played with rook
FEN bug 2. black screen
it's bug