It is a matter of material:
See below
Pins and Skewers - Lesson 27
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Could anybody please tell me where these lessons are given?
Jul 21, 2010
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#4
Sreejish, you can go to http://www.chess.com/chessmentor/myhome.html to access the Chess Mentor program on Chess.com
Hi All:
I hope somebody can help me with Lesson #27 of Pins & Skewers - Tactics. GM Wolff indicates Nxd4 as the correct move rather than N x Ra1. I am puzzled by this because the solution move leaves Black ahead by a bishop, but based on my thought of NxRa1, Black would be ahead by a Rook. Does anyone have any idea why the solution move is preferred?