notyetagm: Black to play: 45 ... ?
 click for larger viewHere Shirov (Black) sees _FOUR_ pieces lined up in a row along the 7th rank: Black a7-rook + Black c7-queen + Black e7-bishop + <UNDEFENDED> White f7-queen Shirov knows that _THREE_ pieces in a row make a chain of pieces for a <DISCOVERED ATTACK>, so that having _FOUR_ pieces in a row is essentially <CLEARANCE> for a <DISCOVERED ATTACK>. That is, Black needs to move his Black c7-queen out of the way (off of the 7th rank) with a <GAIN OF TIME> (<CLEARANCE>) so that he will have the alignment ♖♗♕ along the 7th rank for a <DISCOVERED ATTACK>. So Shirov strikes with 45 ... ♕c7xc3+!.
Position after 45 ... ♕c7xc3+!.
 click for larger viewHis tactical point is revealed after 46 ♔c2x♕c3 ♗e7-b4+. Position after 46 ♔c2x♕c3 ♗e7-b4+ <discovered attack with check>
 click for larger viewThe White c2-king has been <DECOYED> onto the dark square c3 by 45 ... ♕c7xc3+! 46 ♔c2x♕c3 so that now 46 ... ♗e7-b4+ opens the line of the Black a7-rook to the <UNDEFENDED> White f7-queen <WITH TEMPO (CHECK)>. That is, 46 ... ♗e7-b4+ is a <DISCOVERED ATTACK WITH CHECK> against the <UNDEFENDED> White f7-queen by the Black a7-rook. Black regains his queen after 47 ♔c3-d4 ♖a7x♕f7, winning a pawn in the process. |