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MatPlus.Net Forum Competitions BIT 2013 - dedicated to MIlan's ideas
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(1) Posted by Marjan Kovačević [Friday, Apr 5, 2013 18:55]; edited by Marjan Kovačević [13-04-10]

BIT 2013 - dedicated to MIlan's ideas

The more complete Announcement of BPCF 2013, and BIT 2013, with thematic examples on:, or on the direct link:

The Belgrade Internet Tourneys 2013 – Announcement

The problems should be submitted by e-mail only, to, not later than May 5th 2013. Each composer could submit only one problem per group (single or joint), different versions of the same problem will not be accepted. Promoted and fairy pieces are not allowed.
The results will be published on the Internet.

Group A – Mate in two (#2) Judge: Darko Šaljić
At least two changed mates between the phase beginning with white castling (solution or try), and any other phase (set-play, try, solution, but not a twin).
The entries with white-to-play form and those with new records would be especially welcome.
Some comments:
In the computer bases we couldn’t find examples with more than 3 changed mates in 2 phases, with Zagoruyko 3x2 change, or with reciprocal change.
Milan Velimirović worked hard to achieve more than 2 changed mates in a white-to-play #2 (between the set-play and the solution with castling as the key-move). The only result was his Example 1, with a complete block, instead of WTP, and the castling as the thematic try.

Group B) Helpmate in two (h#2) Judge: Miodrag Mladenović
In one of the phases (set-play, solution, twin) White allows a tempo move by Black. In another phase Black allows a tempo move by White. A sacrifice is not obligatory way of allowing the thematic tempo moves. Zero position is not allowed.
Some comments:
In one of his early works Milan created this intriguing combination, adding the set-play condition that makes it even more difficult to realize.
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(2) Posted by seetharaman kalyan [Saturday, Apr 6, 2013 12:07]; edited by seetharaman kalyan [13-04-06]

Seems Long castling not permissible, as the thematic phase. (though one of the examples - Yuri Vahalkov - shows just that)
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(3) Posted by Marjan Kovačević [Saturday, Apr 6, 2013 13:36]

Both castlings allowed!
Thanks for the remark, we shall correct the announcement.
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(4) Posted by Daniel Wirajaya [Tuesday, Apr 9, 2013 06:11]; edited by Daniel Wirajaya [13-04-09]

I am a beginner in chess problem and I intend to take part in this tourney as I am interested in the theme. However, I am sure about the file format and the requirements for submission. Is it okay if I send the diagram and the solution in PDF format?

Thanks a lot.
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(5) Posted by Marjan Kovačević [Tuesday, Apr 9, 2013 10:44]

Yes, PDF format is OK. Welcome!
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(6) Posted by Marjan Kovačević [Wednesday, Apr 10, 2013 16:48]

Some people seem to have problems entering the "Problemista" site. I will add the direct link to the announcement on MPF:
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(7) Posted by Marjan Kovačević [Thursday, Apr 11, 2013 20:36]

Important remarks!!

#2 – Wieland Bruch kindly provided the example with reciprocal change – “possibly the only one so far”:

6.Pl. 1st WCCT (A2), 1972-1975
(= 13+8 )

#2 (13+8)
1. Kd2? (2. Re1) ...Bd4/Bf4+ 2. Qf5/Se3, ...Sc3!;
1. 0-0! (2. Re1) ...Bd4+/Bf4 2. Se3/Qf5, ...Bd5/Qb5/Sc3 2. Qf5/Qe5/Sdc3

h#2 – There were questions how wide is the meaning of the word “allow” (enable).
The judge Miodrag Mladenović decided to accept the wider meaning, as presented in both new examples by Iosif Krikheli.
Moves 1…Bg4! in the a) position of the first one, and 1...Rc1! in the first solution of the second example, do not physically allow the next tempo moves 2.Rg1!/2.Bd3! However, they prevent the negative effects of these tempo-moves: black guard of g6/check to WK. These examples are considered to be thematic.
Besides, there is a new thematic example by Gyorgi Paros.
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(8) Posted by Peter Gvozdjak [Saturday, Apr 13, 2013 14:32]

wieland knows plenty of twomovers, but definitely not all of them. he only was right telling "possibly"...
here's another castling reciprocal change, yet much weaker:

Peter Gvozdják
Einat-Comay-50 JT C 31.12.2007
(= 8+6 )

#2 (8+6)
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(9) Posted by Marjan Kovačević [Saturday, Apr 13, 2013 15:22]

Thanks a lot Peter!
Anyone knows examples with Zagoruiko 3x2 (there should have been some), or 2x4 changes?
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(10) Posted by Rajendiran Raju [Saturday, Apr 13, 2013 15:42]; edited by Rajendiran Raju [13-04-13]

Marjan Kovacevic
Kotelec 1989 1 st Prize
(= 12+6 )

#2 (12+6)
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(11) Posted by seetharaman kalyan [Sunday, Apr 14, 2013 14:55]

Does it show Zagoruijko? I dont see changed mates, though castling key.
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(12) Posted by Hauke Reddmann [Sunday, Apr 14, 2013 15:37]

Try 1.Qb5? Qb8!, with two changes on cxd3/cxb3.
Possibly also 1.f4?? with another change on cxd3.

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(13) Posted by seetharaman kalyan [Sunday, Apr 14, 2013 18:33]

Yes. Two nice changes!
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(14) Posted by seetharaman kalyan [Thursday, Apr 25, 2013 14:17]; edited by seetharaman kalyan [13-04-25]

Whether multi-solutions permitted for section A?
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(15) Posted by Marjan Kovačević [Thursday, Apr 25, 2013 14:29]

"Whether multi-solutions permitted for section A?"

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(16) Posted by Hauke Reddmann [Friday, Apr 26, 2013 10:59]

While we're at it, what about castling as a try...but which
is retro-illegal? (hint hint :-)

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(17) Posted by seetharaman kalyan [Sunday, Apr 28, 2013 09:54]

I think this would be allowed.
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(18) Posted by Marjan Kovačević [Sunday, Apr 28, 2013 22:22]

Yes the retro-illegal try is OK.
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(19) Posted by Marjan Kovačević [Saturday, May 4, 2013 15:16]; edited by Marjan Kovačević [13-05-05]

Final call!

One more day for composing. The number of received entries isn’t big up to now, but the quality is respectable!
Participants - Group A
Abdurahmanović (Bosnia & Herzegovina)
Belchikov (Belorussia)
Burger (USA)
Dyachuk (Ukraine)
Gavrilovski (Macedonia)
Hramtsevich (Belorussia)
Janevski (Macedonia)
Narayanan (India)
Navon (Israel)
Novitsky (Ukraine)
Permyakov (Russia) @ Kapustin (Ukraine)
Radomirović (Serbia)
Reddmann (Germany)
Trommler (Germany)
Vasilenko & Basisty (Ukraine)
Ugren (Slovenia)

Participants - Group B
Abdurahmanović (Bosnia & Herzegovina)
Gadjanski (Serbia)
Gavrilovski (Macedonia)
Martin (Spain)
Mihajlovski (Macedonia)
Navon (Israel)
Nefyodov (Russia)
Radomirović (Serbia)
Shorokhov (Russia)
Stolev (Macedonia)
Ugren (Slovenia)
Vieira (Brazil)
Witztum (Israel)
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(20) Posted by Marjan Kovačević [Sunday, May 5, 2013 20:00]

About the author’s intention in the #2 from Post No.10:
Two main tries: 1.Rd1? cb3! 2.Be1? 1.Kd2? cd3! 2.Qa1? 1.0-0-0! vacates both e1 and a1.
The 1.Qb5? is an additional try, changing both mates. This fact makes it less important example of the BIT 2013 theme.
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MatPlus.Net Forum Competitions BIT 2013 - dedicated to MIlan's ideas