attack on 2 diagonals-B fork
color and patterns
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the most obvious weakness of the B is that is color blind...which is why it is often at its most effective in teaming with another piece or pawns...this way it covers its weakness. for example a B pair compensates of B individual weakness,
potential 2 targets are on dark squares but the N is not/ therefore place the N to match the target color
some pieces have a common pattern