|notyetagm: Mamedyarov vs Carlsen, 2007|
<ounos: Ha! In your face! 28. ... Bd4+!>
Position after 28 ... ♗g7-d4+!:
click for larger view
Here the exceptional Magnus Carlsen plays an excpetional version of the <INTERFERENCE> tactic that even the tactical wizard Mamedyarov has missed.
The White d7-rook is <LOOSE>, attacked by the Black d8-rook while being defended by the White d2-rook. For the White d2-rook to continue to <DEFEND> the White d7-rook, the line d2-d7 must stay open.
Magnus' brilliant 28 ... ♗g7-d4+! is a stupendous <INTERFERENCE> shot, cutting off the line of life-giving force from the White d2-rook to the <LOOSE> White d7-rook with <TEMPO> from <CHECKING> the White g1-king.
Since the defending line piece (White d2-rook) is already on the line, normally the <INTERFERING> piece (Black g7-bishop) would need to be supported by some other Black piece controlling the d4-square. But here Magnus saw that his Black c3-knight does exactly that, since the <CHECK> ... ♘c3-e2+ means that the Black knight controls the d4-tactical target from the e2-tactical base. <<<<<Magnus saw that the Black c3-knight's control of the d4-tactical target could be used to support the Black g7-bishop going to d4 to <BLOCK> the critical line d2-d7.>>>>>
White loses the exchange in all lines:
29 ♖d7x♗d4 ♖d8x♖d4 <x-ray> 30 ♖d2x♖d4 ♘c3-e2+ <knight fork> and 31 ... ♘e2x♖d4
29 ♖d2x♗d4 ♘c3-e2+ <knight fork> and 30 ... ♘e2x♖d4