Self-pin - suicide or salvation?

by ChessBase
10/20/2010 – In this position from the 20th game of the world title match Alekhine-Euwe 1935, Black (Alekhine) had just played 29...Rd6-a6 putting his pieces in very a delicate situation on the queenside. How would you judge the situation now? A) equal, Black will unpin on the next move with ...Bb5; B) White can prevent this manouvre leaving the black pieces on a dead track; C) he wins material instantly. The solution is here, but first ponder over it with a larger version of the diagram.
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Self-pin - suicide or salvation?
In this position from the 20th game of the world title match Alekhine-Euwe 1935, Black had just played 29...Rd6-a6 putting his pieces in very a delicate situation on the queenside. How would you judge the situation now?

A) equal, Black will unpin on the next move with ...Bb5;
B) White can prevent this manouvre leaving the black pieces on a dead track;
C) he wins material instantly.

Solution

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