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MatPlus.Net Forum General A h# theme
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(1) Posted by Hauke Reddmann [Monday, Apr 8, 2019 13:01]

A h# theme

Due to zugzwang, Black must move away a man from
a field where it otherwise could be conventiently captured
(say, to a field where it's critically cutted off).

Do you have examples? Or maybe the theme has already a name?
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(2) Posted by Jacques Rotenberg [Monday, Apr 8, 2019 13:20]

Something like that ?

Jacques Rotenberg
Michel Caillaud
Phenix 1995
1st Prize
(= 8+6 )


1.?? B~ 2.Kd4 Q(×)e4‡
1.Rd4! B×d4 2.K×d4 Qe4‡
1.?? S~ 2.Kd5 Q(×)e6‡
1.Bd5! S×d5 2.K×d5 Qe6‡
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(3) Posted by Marcos Roland [Monday, Apr 8, 2019 17:17]

Beautiful problem, Jacques!
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(4) Posted by Hauke Reddmann [Monday, Apr 8, 2019 18:30]

That's by annihilation, not critical interference,
but yes, this definite counts, especially if it
got a 1st prize :-) (So has it a name?)
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(5) Posted by Geoff Foster [Tuesday, Apr 9, 2019 02:52]

The annihilation form is the Zajic theme. It was named by Chris Feather in an article in The Problemist in May 1999. Chris Feather wrote: "In a h#2 Black's first move blocks an initially empty square. White's first move is a capture of this blocking piece, and on Black's second move the previously moved white piece is captured by the King. ... The theme was devised by Helmut Zajic as part of his theoretical researches into the idea of Antizielelemente (paradoxical motifs which apparently go against the stated aim of the problem) and then translated into practice in the first setting of the theme ... in a tourney of which I was the judge."

Helmut Zajic, 3 HM Schach-Echo 1976
(= 6+8 )
1.Qf5 Sxf5 2.Kxf5 Rxh5#
1.Qh4 Rxh4 2.Kxh4 Sdxf3#

An article by Helmut Zajic on Antizielelemente appeared in Die Schwalbe in 1980. Perhaps that article will have an example of the critical interference type that Hauke wanted?
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(6) Posted by Geoff Foster [Tuesday, Apr 9, 2019 02:56]

Oops, Hauke wanted Black's first move to be due to zugzwang.
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(7) Posted by Jacques Rotenberg [Tuesday, Apr 9, 2019 03:05]

This seems to fit the request, a wonderful problem :

Markus Ott
Schach-Aktiv 1993
1st Prize
(= 4+7 )


1.Ba4 Sf2 2.Ke3 b3 3.Sf3 Sd1‡
1.Ra4 Sf5 2.Ke2 b4 3.Rf1 Sd4‡
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(8) Posted by Hauke Reddmann [Tuesday, Apr 9, 2019 19:52]; edited by Hauke Reddmann [19-04-09]

Thanks, that exactly fits the bill.
And Zajic should have been the "usual suspect" :-)
EDIT: This is a B/W critical cutoff, do you also
have one with B/B? I'm too lazy to dig through
my whole SCHWALBE pile :-)
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(9) Posted by seetharaman kalyan [Tuesday, Apr 9, 2019 20:50]; edited by seetharaman kalyan [19-04-09]

Wonderful problem Markus Ott
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(10) Posted by Viktoras Paliulionis [Tuesday, Apr 9, 2019 23:38]

This is a combination of two themes: tempo and Cheney-Loyd.

Kjell Widlert
Macleod-Zappas JT 1988-89, 2 HM
(= 7+9 )

h#2 b) wSh6->c8

a) 1. Bd6 Sg4 2. Rf4 Rg3#
b) 1. Rh4 Sd6 2. Bf4 Be4#

Additionally, there is a Grimshaw theme here.
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(11) Posted by Geoff Foster [Wednesday, Apr 10, 2019 00:38]

In the Ott problem the set play is:

1...Sf2 2.Ke3 ~ 3.Sf3 Sxd1#
1...Sf5 2.Ke2 ~ 3.Rf1 Sxd4#

In the set play White has a choice of 5 tempo moves. The real play starts with a black tempo move, after which White's second move closes a black line (it is no longer a tempo move).
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(12) Posted by Geoff Foster [Wednesday, Apr 10, 2019 01:02]

Here is another example of the Zajic theme with B1 tempo move.

Helmut Zajic, 6 HM, Rochade Europa 2001
(= 7+8 )
H#2 (b)Pc3>a3

(a) 1.Qc4 Sxc4 2.Kxc4 Qa2#
(b) 1.Rc5 Bxc5 2.Kxc5 Qa5#
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MatPlus.Net Forum General A h# theme