notyetagm: GID(Karjakin vs Ivanov Russian Team Championship 2010)
10 ... b6-d8
Black has just played 10 ... b6-d8, apparently threatening to win a piece by the <REMOVAL OF THE GUARD> tactic
11 ... g4xf3 12 g2xf3 d8xd4. But is this tactical idea really a threat?
Ho hum. Karjakin (White) says no, it's not and just castles long.
11 ... g4xf3
Just <REMOVING THE GUARD> of the White d4-bishop, right?
<Wrong! <<<FORCING MOVES SHOW YOU WHERE THE PIECES *REALLY* ARE, NOT WHERE THEY ONLY *APPEAR* TO BE !>>>. Forcing moves are <CHECKS>, <CAPTURES>, and <THREATS>. Because the White d4-bishop can <<<CAPTURE>>> the Black f6-knight, the White d4-bishop therefore has a <FORCING MOVE>, which means that it only <<<*APPEARS*>>> to be on the d4-square. This dark-squared White bishop is <<<*ACTUALLY*>>> on the f6-square, where it has just <CAPTURED> the Black f6-knight and threatens the Black d8-queen.>
So, in summary, 11 ... g4xf3 does *not(!)* in fact <REMOVE THE GUARD> of the White d4-bishop because the White d4-bishop only <*APPEARS*> to be on d4. Since it is <*ACTUALLY*> on the f6-square, because it has the <FORCING MOVE> 12 d4xf6, 11 ... g4xf3 does not <REMOVE ITS GUARD>.