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1st October
2017

B P C F
2017





 
 
MatPlus.Net Forum Competitions 12th Belgrade Festival 26-28.05.2017.
 
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(21) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 22:15]

No, white pawn makes a tempo for Sc4.
 
   
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(22) Posted by Marjan Kovačević [Tuesday, Apr 25, 2017 22:57]; edited by Marjan Kovačević [17-04-26]

Maybe a simpler way:
(= 2+4 )

1...e1B 2.Rf8 Bh4 3.Rf6+ B:f6#
1...e1R+ 2.Rc1 Rh1 3.Rb1 R:b1#
 
   
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(23) Posted by Georgy Evseev [Wednesday, Apr 26, 2017 10:12]

You may also check this version (though, it has a number of cooks).

W: Kb1 Ra1e1 Pc7
B: Kf7 Rc2e2 Ph2c4e7

1...h1R 2.c8S Rh6 3.Sb6 Rxb6#
1...h1B 2.c8Q Be4 3.Qxc4+ Rxc4#
 
 
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(24) Posted by Miodrag Mladenović [Wednesday, Apr 26, 2017 13:21]

@Petko

I bet there will be no AUW shown since there are two solutions required. Perhaps "Mixed AUW" or 4 black promotions split between two black powns. The AUW theme can only be shown if there are thematic tries. Who knows, perhaps it's possible to compose it.
 
   
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(25) Posted by Marjan Kovačević [Wednesday, Apr 26, 2017 13:48]

Could we agree we have one correct version (22) of the example with promotions to BB & BR?
The training shows it will not be easy to control some pieces...
 
   
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(26) Posted by Miodrag Mladenović [Wednesday, Apr 26, 2017 15:17]

Version (22) looks like correct to me. I do not see a possible cook but who knows.
 
   
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(27) Posted by Georgy Evseev [Wednesday, Apr 26, 2017 15:54]

Version (22) IS correct.

Stamp Signature
 
   
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(28) Posted by Geoff Foster [Thursday, Apr 27, 2017 00:49]

Version (22) is sound.

Petko's setting (20) has several cooks.
(= 3+7 )


1...g1R 2.Sb3 Rh1 3.Sc1 Rxc1#
1...g1B 2.Sf3 Bh2 3.Se5 Bxe5#
1...g1Q 2.Se4 Qf1 3.Sf6 Qxf6#

1...g1Q 2.Sb3 Qg8 3.a4 Qxb3#
1...g1Q 2.a4 Qg8 3.Sc4+ Qxc4#
1...g1Q 2.a4 Qg8 3.Sb3 Qxb3#
1...g1Q 2.a4 Qg4 3.Sc4+ Qxc4#
1...g1R 2.Se4 Rg5 3.Sg3 Rc5#
1...g1R 2.a4 Rg4 3.Sc4+ Rxc4#
 
   
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(29) Posted by Petko Petkov [Friday, Apr 28, 2017 07:26]

Here Ba6 is not needed. With black Pa4 probably all is OK?
 
   
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(30) Posted by Miodrag Mladenović [Friday, Apr 28, 2017 08:38]

@Petko

There is still a cook:

1...g1R 2.Se4 Rg5 3.Sg3 Rc5#
 
   
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(31) Posted by Geoff Foster [Friday, Apr 28, 2017 12:19]

(= 2+5 )

1...g1Q 2.Se4 Qf1 3.Sf6 Qxf6#
1...g1Q 2.Sb3 Qb1 3.Sc1 Qb4#
1...g1R 2.Se4 Rg5 3.Sg3 Rc5#
1...g1B 2.Sf3 Bh2 3.Se5 Bxe5#

Here the first solution is not wanted.
 
   
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(32) Posted by Geoff Foster [Saturday, Apr 29, 2017 01:18]

This one is thematic for the tourney.

(= 2+5 )

1...g1=Q 2.Sg8 Qf1 3.Sf6 Qxf6#
1...g1=B 2.Sf7 Bh2 3.Se5 Bxe5#
 
   
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(33) Posted by Petko Petkov [Monday, May 1, 2017 16:38]

AN INTERESTING NOVELTY: hs#n Min!

The definition is analogical: Help - selfmate Min is a new condition, with the help-play before the last two half- moves, presenting S#1 Minimummer (Black has to play the geometrically shortest longest move).
1. Educational Example(P.A.Petkov): White: Ka6,Qa7(2); Black Ka2, rb8,rh4 (3) - hs#2,5Min
a6, a7, a2, b8 h4

Solution: 1...Rb2!2.Qd7 Rhb4! 3.Qa4+ Rxa4#! But not 1...Rh3? 2.Qc5 Rhb3 3.Qa3+? and now follows not 3...Rxa3# bur 3...Kxa3! Therefore the key - move 1...Rb2 blocks the square "b2" because of 3.Qa4+? Kb2!!

2. Educational Example (P.A.Petkov): White: Ka1,Ra7,Pe7(3); Black Kb5, ra8,sd1,bh7 (4) - hs#3 Min - 2 solutions
a1, a8,e7, b5, a8 d1 h7
Solutions: I.1.Ra3 Ra4 2.e8S Ka5 3.Sc7!Rxa3#; II. 1.Ra4 Ra5 2.e8Q+ Ka6 3.Qb8!Rxa4#



AN IMPORTANT SUMMARY!
We can define the new hs# type as a general condition rule as follows: hs#(N)(X) Where: N is the number of moves, and X is an appropriate fairy condition, which has to be fulfilled. Of course this fairy condition can be not only Max. or Min.
Pay attention that in hs#(n)max. or hs#(n) min the fairy condition affects only one half-move - of black pieces. But in many other "additional conditions"(of type X!) the fairy condition can affect two last half-moves!
For example: we have: HS#3 Sen. - where the last part s#1 is under the Sentinels rules!!

3. Educational Example (P.A.Petkov):White:Ka1,Qg8, Rc4,Sb1 (4); Black: Kd3, Pd2(2)- hs#3 sen.-
a1, c4,g8, b1,d3, d2
solution: 1.d1S! Re4 2.Qa2 Sb2 and then follows Sentinels s#1 - 3.Qc4(w.Pa2)+!Sc4(b.Pb2)#!

Of course the "main part" of the stipulation can be also HS=, HS==, HS+ etc. An other idea is also to play in the n-1 moves under fairy condition "A" but in the last nth move under the fairy condition <. For example , possible is: Hs# Max + Minimum - this means: n-1 moves Minimum but in the last move Maximum etc.
I'm preparing a special article on this topic.But no doubt the beginning of the great idea gave MatPlus!
 
   
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(34) Posted by Marjan Kovačević [Tuesday, May 2, 2017 01:28]

Group B clarification:
Both forms (W-B & B-W) have to be presented in the same problem, as in the example.
 
   
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(35) Posted by Geoff Foster [Tuesday, May 2, 2017 11:36]

Thanks to Petko for his very interesting post. The solution of Example 3 should start 1.Re4 d1S (not 1.d1S Re4)! Unfortunately the first two examples are cooked (I didn't check Example 3).

Example 1 is cooked by 1...Rh1 2.Q~ Ra1 3.Qb3+/Qb2+ Kxb3/Kxb2#

Example 2 has several cooks, for example:
1.Ra3 Ra4 2.e8Q+ Ka5 3.Qc6 Rxa3#
1.e8Q+ Kb6 2.Q~ Kxa7 3.Qb6+/Qb7+ Kxb6/Kxb7#
1.Ra5+ Kxa5 2.e8Q ~ 3.Qb5+ Kxb5#
 
 
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(36) Posted by Vitaly Medintsev [Tuesday, May 2, 2017 13:00]; edited by Vitaly Medintsev [17-05-02]

Whether is a Black Pawn on 7th rank/White Pawn on 2nd rank a line-piece?
Related to Group B
 
   
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(37) Posted by Marjan Kovačević [Wednesday, May 3, 2017 00:12]

@ Vitaly
It is usually considered as a line movement, like in Pikabish interference. It would be good to hear opinion of the judge Miodrag Mladenović.
 
   
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(38) Posted by Miodrag Mladenović [Wednesday, May 3, 2017 07:02]; edited by Miodrag Mladenović [17-05-03]

Vitaly wrote
 QUOTE 
Whether is a Black Pawn on 7th rank/White Pawn on 2nd rank a line-piece?
Related to Group B


Of course two step move by black/white powns are line movements.
 
   
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(39) Posted by Administrator [Wednesday, May 3, 2017 08:47]

For Schedule and Accommodation see The Headlines!
 
 
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(40) Posted by Vitaly Medintsev [Wednesday, May 3, 2017 08:58]

@ Marjan & Misha

Thanks for the clarification
 
 
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MatPlus.Net Forum Competitions 12th Belgrade Festival 26-28.05.2017.