In a 4x4 chessboard, we can have this placement:
+---+---+---+---+
| | B | B | |
+---+---+---+---+ B -> Bishop
| N | | | N | N -> Knight
+---+---+---+---+
| N | | | N |
+---+---+---+---+
| | B | B | |
+---+---+---+---+
This satisfies all the given conditions.
Thus, the required smallest dimension of the square chessboard is 4x4.
For a more detailed explanation, refer to the solution submitted by Jer in this location.
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