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It's a black bishop, but not necessarily a dark-squared bishop. Both the black side and white side in a normal chess game get a dark-squared and a light-squared bishop, and I don't see anywhere that specifies which type this one is. It can be either one depending on where you place it.

Also if you care that much just mirror the solution horizontally or vertically, and now your bishop is on the white square instead.

The instructions likely mean that the bishop itself is black, not the square that it is on.

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.

> The task is to place four black queens and one black bishop on the chessboard

where did you read "dark-squared"?