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1st October
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MatPlus.Net Forum Competitions 12th Belgrade Festival 26-28.05.2017.
 
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(1) Posted by Marjan Kovačević [Saturday, Feb 4, 2017 01:40]

12th Belgrade Festival 26-28.05.2017.


The 12th BPCF will include Open Championship of Serbia, as a part of World Solving Cup 2016/17. The director will be Ivan Denkovski.
 
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(2) Posted by Borislav Gadjanski [Sunday, Apr 23, 2017 21:07]

Belgrade Internet Tourneys 2017

Announcement: http://matplus.net/pub/BIT2017.pdf
 
 
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(3) Posted by Petko Petkov [Monday, Apr 24, 2017 20:32]

To Belgrade Internet Tourneys 2017 – sction C

Pay attention that in this sheme is possible also:1…f1Q 2.Sf6 Qg2 3.Sd5 Qxd5# or 1…f1Q 2.Sd6 Qg2(Qf3) 3.Sb7 Qxb7#.
 
   
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(4) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 01:18]; edited by Marjan Kovačević [17-04-25]

Looking for cooks should give a long forgotten pleasure to the solvers in Belgrade, and some more challenge to composers ...
Would next version be sound?

(= 3+5 )

 
   
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(5) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 01:24]

... No, it isn't... 1...g1Q 2.c5 Qh1! 3.c6 Qxc6#
 
   
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(6) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 01:32]; edited by Marjan Kovačević [17-04-25]

And this one has a nice cook,too:
(= 3+5 )

1...g1Q 2.Se4 Qf1! 3.Sf6 Q:f6#
 
   
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(7) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 01:52]

How about this one?
(= 2+6 )

With a try 1...g1R 2.?? Rg4 3.Sc4+ R:c4#
 
   
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(8) Posted by Petko Petkov [Tuesday, Apr 25, 2017 08:12]

In both positions is possible also a solution with B-promotion: 1...g1B 2.Sc6 Bh2 3.Se5 Bxe5#
 
   
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(9) Posted by Georgy Evseev [Tuesday, Apr 25, 2017 10:50]

In last version Queen promotion still seem to work the same way as a rook one - the diagonal is too short.

Maybe, the following version may work?

W: Kb3 Qc2 Sc3 Pa4d2
B: Kc5 Sb5 Pd3f2h7

1...f1B 2.Qb2 Bg2 3.Sd5 Bxd5#
1...f1R 2.Qb1 Rh1 3.Sa2 Rxb1#
 
   
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(10) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 14:52]

Thanks, Georgy! Again at least one nice cook: 1...f1Q 2.Q:d3 Qa1 3.Qd4+ Sd4#
It seems there will be a lot of fun for composers and solvers!
What about next version, is it correct?

(= 3+5 )

1...g1B 2.Sc6 Bh2 3.Se5 B:e5#
1...g1R 2.Sb3 Rh1 3.Sc1 R:c1#
 
   
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(11) Posted by Georgy Evseev [Tuesday, Apr 25, 2017 15:11]; edited by Georgy Evseev [17-04-25]

1...g1Q 2.~ Qg5 3.~ Q(x)a5#, while white knight moves randomly...

Qc2 may be moved to c1 in my version (still probably cooked).

In principle h#2.5 with inverted colors may be tested and then only solutions with Max. last move selected. Unfortunately, there will be thousands of solutions...

--- added
Tested my version (with Qc1) in this way.

Two groups of cooks:
1...f1Q 2.Qb2 Qg1 3.S~ Qg8#
1...f1Q 2.Qb2/Qa1 Qc1 3.Qa3+ Qxa3#
 
   
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(12) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 17:27]

A wealth of interesting cooks! I do hope nobody would try to create any programmed testing, but rather test solving skill instead.
Does this correct all cooks, with 2 tempo-missing tries to mate on c4 and c6?

(= 2+6 )

 
   
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(13) Posted by Geir Sune Tallaksen Østmoe [Tuesday, Apr 25, 2017 19:02]

Then 1...g1Q 2.Sb3 Qb1 3.Sc1 Qb4#.
 
 
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(14) Posted by Petko Petkov [Tuesday, Apr 25, 2017 19:10]

Marjan,in this version there are three missing-tries: an other possibility is 1...g1Q 2.?? Qg8 3.Sb3 Qxb3#. Therefore better is probably with Sa5->d2
 
   
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(15) Posted by Petko Petkov [Tuesday, Apr 25, 2017 19:37]

My proposal is the following version:

White: Kc3, Sd2 (2)
Black: Ke3, Ba6, Sa1, Sd3, Pg2, ph6 (6)
2 solutions: I. 1...g1B 2.Sf3 Bh2 3.Se5 Bxe5#, II. 1.g1R 2. Sb3 Rh1 3.Sc1 Rxc1#.
Try: 1...g1Q? 2.?? Qg8 3.Sb3 Qxb3#
 
   
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(16) Posted by Miodrag Mladenović [Tuesday, Apr 25, 2017 20:01]

@Petko,

There are more tries in your position:
1...g1Q 2.??? Qg8/Qg4 3.Sc4+ Qxc4#
1...g1R 2.??? Rg4 3.Sc4+ Rxc4#
 
   
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(17) Posted by Miodrag Mladenović [Tuesday, Apr 25, 2017 20:03]; edited by Miodrag Mladenović [17-04-25]

@Petko
There is a cook that can be nice third solution I think:

(= 2+6 )

i) 1...g1R 2.Sb3 Rh1 3.Sc1 Rxc1#
ii) 1...g1B 2.Sf3 Bh2 3Se5 Bxe5#
iii) 1...g1Q 2.Se4 Qf1 3.Sf6 Qxf6#
 
   
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(18) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 21:16]

@ Geir, Misha
Wonderful cooks :)
@ Petko, Misha
Already forgotten one from previous positions:
1...g1Q 2. ~ Qg5 3.~ Qa5#
 
 
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(19) Posted by Petko Petkov [Tuesday, Apr 25, 2017 21:23]

Of course, it is a nice novelty! But I think that this position is only a good scheme. For a high ranking, something much better is needed.I guess that many will present an AUW!?
 
   
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(20) Posted by Petko Petkov [Tuesday, Apr 25, 2017 21:25]

Yes! Therefore we can try again with black Pb5 + white Pa3?
 
   
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MatPlus.Net Forum Competitions 12th Belgrade Festival 26-28.05.2017.