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MatPlus.Net Forum General Secondary Schiffmann
 
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(1) Posted by Michael McDowell [Wednesday, Feb 14, 2007 18:35]

Secondary Schiffmann


(A) G.Christoffanini
1st Prize Tijdschrift v.d.NSB 1931
(= 10+8 )

Mate in 2
 
 
1.Qf7 (>2.Qxe6)
1...Qxd5 2.Se4 (Sb5?)
1...Qxe2 2.Sb5 (Se4?)
1...Rxd5 2.Qxc7
1...Sxd5 2.Qxf4
1...exd5 2.Qe7

(B) M.McDowell
HM British Chess Magazine 1987-88
(= 11+9 )

Mate in 2
 
 
1.Qc4 (>2.d5)
1...Rxc6 2.Sd6
1...Sxc6 2.Qxe6
1...Qxf4 2.Sg3
1...Rxf4 2.Sf2
1...Bxf4 2.Re3
1...Sa3 2.Sc3
I have seen both the mainplays of (A) and the captures on f4 in (B) described as "secondary Schiffmann" (in the latter case not by me!).

Could someone give a proper definition of the term with an example or two?
 
(Read Only)pid=459
(2) Posted by Uri Avner [Wednesday, Feb 14, 2007 19:41]; edited by Uri Avner [07-02-14]

I would not call what happens in both examples as "secondary Schiffmann".
On the other hand, what happens in the following Cacciari problem can be seen as such.
From a Correction point of view 1...Bxe5 can be seen as random arrival, 1...Qxe5 and 1...Sxe5 - as arrival corrections. These corrections can easily be defined as "secondary Schiffmann defences" against the secondary threat 2.Se7.
 
E. Cacciari
Parallele 50, 1948
(= 12+9 )

#2
 
 
1.d6! (2.Be6#)
  1...Bxe5 2.Se7#
  1...Qxe5! 2.Sg3#
  1...Sxe5! 2.Qxh7#

 
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MatPlus.Net Forum General Secondary Schiffmann