Günther Weeth 75 JT C 31.7.2011 - announcement
feenschach is organising the GŁnther Weeth 75 JT as its 63rd theme tourney.
Required are problems of any kind on the 8 by 8 board, in which at least one magic square
(type I and/or II) is present and plays a thematic part. Retro-problems are also specifically
welcome, including ones featuring additional fairy conditions. It is up to the judge Hans Gruber
to decide whether to divide the entries into two sections (problems with forward play and
retro-problems), if the entry justifies it.
For an article and examples see feenschach 182,p.297ff. (www.feenschach.de)
The Director of the tourney is Klaus Wenda, who is providing four book prizes, and to whom entries
should be sent (printed or stamped on diagrams).
Dr Klaus Wenda, Rasumofskygasse 28, A-1030 WIEN
The closing date is July 31st, 2011.
While examples of the official announcement was more aimed at retro problems, below I have selected a few forward
problems of all kinds. What do they have in common? Seemingly it is limited material on one side, thereby requiring
this way of another the visit of the magic square. This is underlined by the pair of the only problems
with magic squares
on CCM until now, namely #2 by Albert H. Kniest (single wQ in the diagram position)
and h#3 by Juraj Lörinc (white Rex Solus).
Rex Multiplex 1983
1.Bc6? th. 2.Qe6# A (2.Qc8?)
1.e6? th. 2.Qc8# B (2.Qe6??)
1.Rh3! th. 2.Sb2#
1...Rxb5 a 2.Qc8# B (2.Qe6+ Rd5!)
1...Qxb5 b 2.Qe6# A (2.Qc8+ Qc6!)
Here the role of two magic squares is different from previous four problems.
Instead of their active use for colour changes,
they are used to prevent moves of some pieces to them because of the self-check.
Black queen cannot go move any of them (but it has access to c6 from b5),
while black rook can go to d5, but not c5.
The strategy for "Dombrovskis" is easy. In tries white guards additionally b5 to threat
queen mate(s), but one mate is impossible by white error and the other is successfully defended by the right
capture on b5. In solution another mate is threatened (by knight), and captures become blocks with
dual avoidance as stated.
Why then "Dombrovskis", not Dombrovskis? Simply because the solution variations are prepared already in the set play
and the key brings nothing new. This feature is shared by many problems claiming to show Dombrovskis, but
generally frowned upon by certain experts of move function changes in twomover.
So we have two important roles of magic squares: getting valuable material for one of sides (in problems 1-4 so far)
and avoidance of some moves (in this problem). Note that my own
h#3 already quoted above uses both of them: c3 and d1 as source of
white pieces, while e3 is used as prevention of cooks with wQe3# impossible.
Note also that this problem is the only with substantial number and quality of pieces on both sides,
all other cited problem have one of sides strongly constrained.
Magic squares c5, d5
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