Double check 2
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Bf6 is the correct answer.
Diagram 1 shows the position at the end of the last page. In diagram 2 white
has played Bf6 double + so the black king is in check from the white bishop and the white rook.
Diagram1 Diagram 2
In diagram 3 white has played Be5+.
The king is in check from the rook but
not from the bishop.
This is not double check.
Diagram 4
How can black produce a double check?
or Ng2
or either of these moves would give double check.