user1814: Black was in a position to take a white bishop with the king.  The white bishop was protected by a white knight.  However, if the white knight was moved it would expose the white king to the black queen.
Thus, is the king actually in check if the attacking piece (white knight) cannot be moved?
Or,
Can the king move into check if the attacking piece (white knight) cannot move?
Thank you.

user1751: Still considered in check. FIDE handbook from the WCF website.

3.9
  The king is said to be 'in check' if it is attacked by one or more of the opponent's pieces, even if such pieces are constrained from moving to that square because they would then leave or place their own king in check. No piece can be moved that will either expose the king of the same colour to check or leave that king in check.


1814: <p>Black was in a position to take a white bishop with the king.  The white bishop was protected by a white knight.  However, if the white knight was moved it would expose the white king to the black queen.</p>

<p>Thus, is the king actually in check if the attacking piece (white knight) cannot be moved?<br>
Or,
Can the king move into check if the attacking piece (white knight) cannot move?</p>

<p>Thank you.</p>
 1751: <p>Still considered in check. <a href="http://www.fide.com/component/handbook/?id=124&amp;view=article">FIDE handbook</a> from the WCF website.</p>

<blockquote>
  <p>3.9<br>
  The king is said to be 'in check' if it is attacked by one or more of the opponent's pieces, <strong>even if such pieces are constrained from moving to that square because they would then leave or place their own king in check.</strong> No piece can be moved that will either expose the king of the same colour to check or leave that king in check.</p>
</blockquote>
