that's exactly what happened to me. I ended up spending so much time thinking black bishop can only go to black squares. and agreed this is a bit ambiguous.
You can rotate any solution by 90 degrees, which would toggle the square colour of your bishop, so it doesn't ultimately matter.
>thinking black bishop can only go to black squares. and agreed this is a bit ambiguous
sorry, "The task is to place four black queens and one black bishop on the chessboard" is not at all ambiguous.