Now, even if the rook on the dark square got there by being a pawn capturing a black piece, as well as discovering check on the black king, I don't see how that relates to the identity of the space marked with the question mark.
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re(2): An impossible check?? (partial spoiler)
