9/14/2009 – ... was the white bishop on b3, in view of the threat ...a5-a4, which has prompted White to resort to violent measures with
21.Bxd5. How would you assess the continuation?
A) best, White wins a second pawn with a clear advantage;
B) not as strong as it looks, Black gets one pawn back by force, leaving him only marginally worse;
C) this move is actually a mistake, White loses a piece.
The solution is
here,
but first ponder over it with a larger version of the diagram.