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MatPlus.Net Forum Twomovers Is this a good example of a diagonal-orthogonal pair with the same theme?
 
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(1) Posted by Eugene Rosner [Friday, Jan 27, 2012 01:31]

Is this a good example of a diagonal-orthogonal pair with the same theme?


theme: key grants the black king flight squares leading to cross-check variations...

Milan R.Vukcevich
2nd Hon. mention
USPB, 1981
(= 11+11 )

#2
1.Qe2 (2.Qg4#)1...Kxf5+/Kf4+ 2.Sf3/Sf6#

Eugene Rosner
2nd Prize
USPB, 1984
(= 8+12 )

#2
1.Qb2 (2.Sh4#) 1...Kf4+/Ke4+ 2.Qe5/Se5#
 
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(2) Posted by Hartmut Laue [Friday, Jan 27, 2012 17:54]; edited by Hartmut Laue [12-01-27]

Very pleasant couple! In your problem, it is nice to see why 1.Qd4?, 1,Qc3? don't work. No white pawns, elegant.
In a sense, an old-fashioned theme, but if the Ellerman/Mansfield generation did not find these flowers, it is good they still were discovered.

Nice day for presenting these beauties: January 27(=3³) is W. A. Mozart's birthday! (256=2^8 years ago)
 
 
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(3) Posted by Jacques Rotenberg [Saturday, Jan 28, 2012 18:50]; edited by Jacques Rotenberg [12-01-28]

Yes a very nice problem Eugene, The "side" variations 1...Be1+ & 1...Bxh2 are pleasing : the battery is much more active than it seems
 
 
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(4) Posted by Eugene Rosner [Sunday, Jan 29, 2012 02:44]

glad you saw that! the refutations to the tries 1.Qd4/Qb3? e5/Bf4! lead to selfblock variations in the solution 2.Sd4/Qxb1#
 
   
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(5) Posted by Jacques Rotenberg [Sunday, Jan 29, 2012 03:00]

The set play 1...e5 2.Sd4# is important : it gives a role to the Bh1, and then masks a little bit more the key.
An idle Bh1 would give the solver an indication for a flight giving key.
 
 
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MatPlus.Net Forum Twomovers Is this a good example of a diagonal-orthogonal pair with the same theme?