user17295: My move resulted in us both being in check. Is this legal?

user825: No. You shouldn't have any position where both kings are in check. Your move was illegal.

user924: No, because of the basic rule that says you can't put or leave yourself in check. From the FIDE Laws of Chess:

3.9.2 No piece can be moved that will either expose the king of the same colour to check or leave that king in check.

That the other king is also in check isn't relevant.

17295: <p>My move resulted in us both being in check. Is this legal?</p>
 825: <p>No. You shouldn't have any position where both kings are in check. Your move was illegal.</p>
 924: <p>No, because of the basic rule that says you can't put or leave yourself in check. From the FIDE Laws of Chess:</p>

<blockquote>
  <p><strong>3.9.2</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>

<p>That the other king is also in check isn't relevant.</p>
