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Pawn
 
Joined: Mon Sep 03, 2007 5:25 pm
Posts: 6
 Post subject: Need help understanding skewer example
PostPosted: Sat Jan 09, 2010 7:18 pm 
The following skewer example is from Susan Polgar's book Chess Tactics for Champions. It is example #20 on page 113.

Image

The solution is:
"After an unexpected mate threat, Black can skewer. 1. ... Qc6 2. f3 Qb5.

Can someone please explain to me which piece is being skewered?

Thanks


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King
 
Joined: Sat Aug 13, 2005 3:13 pm
Posts: 304
Location: Finland
 Post subject: Re: Need help understanding skewer example
PostPosted: Sun Jan 10, 2010 10:52 am 
The skewered piece is wBb2. After 1.Qc6 (> Qxg2#) f3 2.Qb5 the threat is 3.Qxb3. There is no way to protect the bishop and when it moves away the other bishop is 'skewered' by Qxb2.


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Pawn
 
Joined: Mon Sep 03, 2007 5:25 pm
Posts: 6
 Post subject: Re: Need help understanding skewer example
PostPosted: Sun Jan 10, 2010 8:37 pm 
mrmip,

I see it now. I was thinking the White Bishop on b3 was protected by White's Queen on d1, but I completely overlooked Black's Knight on a5.

Thanks!


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Site Admin
 
Joined: Thu Sep 04, 2003 12:42 am
Posts: 1430
Location: Utrecht, The Netherlands
 Post subject: Re: Need help understanding skewer example
PostPosted: Sun Jan 10, 2010 8:44 pm 
mrmip wrote:
The skewered piece is wBb2. After 1.Qc6 (> Qxg2#) f3 2.Qb5 the threat is 3.Qxb3. There is no way to protect the bishop and when it moves away the other bishop is 'skewered' by Qxb2.



You could well discuss if this is a proper skewer. As a skewer is a "reverse pin", the most valuable piece is in front of the less valuable piece. In this case Bb2 is "pinned" by another bishop. It might be sophistry, however. :)


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Moderator
 
Joined: Thu Dec 09, 2004 9:20 pm
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Location: Wales, UK
 Post subject: Re: Need help understanding skewer example
PostPosted: Sun Jan 10, 2010 9:23 pm 
I agree, Jeroen. My understanding of the term 'skewer' is normally to refer to a situation where a stronger piece is attacked with a weaker piece lying behind. Since these are both bishops, that doesn't quite fit.

Technically, I don't think this really qualifies as a skewer, and is therefore a bad example from a pedagogical viewpoint!

Still, nice tactic! :)


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