|(1) Posted by Siegfried Hornecker [Friday, Nov 5, 2010 10:30]; edited by Siegfried Hornecker [10-11-05]|
Y. Konoval, British Chess Magazine 01/2010
(= 4+2 )
British Chess Magazine 01/2010
1.g6+ Kh6 2.g7 Qf2+ 3.Rd2 and:
- 3...Qf3 4.g8R! Qc6+ 5.Kd1 Qh1+ 6.Ke2 wins
- 3...Qf1 4.g8S+! wins
- 3...Qf4 4.g8B! wins
A pity there is no queen promotion variation... it would be the perfect AUW.
|(2) Posted by Jacques Rotenberg [Friday, Nov 5, 2010 12:57]|
|(3) Posted by Sergiy Didukh [Friday, Nov 5, 2010 14:35]|
I saw this position half a year ago and added there the lacking promotion to Q, I think. But as it was hard to develop the position into a good study I dropped it and forgot it. But you may be sure there's an AUW with 6 pieces. The position must be in some of my e-mail letters. I'll have a look. But maybe it's not necessary, because there are tables to help you?
|(4) Posted by Siegfried Hornecker [Friday, Nov 5, 2010 14:41]|
I don't understand what you want to suggest. I am not one of the guys who have the means to find everything in the tablebases. Wondering why it was not published already with the loads of extraction tools that the guys who want to forbid 6-piece compositions seem to have available?
|(5) Posted by Sergiy Didukh [Friday, Nov 5, 2010 15:15]|
Here's the position. According to the date of my mail I found it on December 14th 2009.
(= 4+2 )
Black to move
1...Qxb5 2.g8Q win.
Also 1...Qc8+ 2.Rc3 Qe6 3.g8R
And after 1...Qf2+ three known promotions follow.
|(6) Posted by Siegfried Hornecker [Friday, Nov 5, 2010 15:39]|
|(7) Posted by Sergiy Didukh [Friday, Nov 5, 2010 19:45]|
This study is dedicated to the biggest fan of AUW theme that I have ever met - Siegfried Hornecker.
(= 5+4 )
1.Rg3+ (1.Rc3? Qxg7 2.Rxc2 Qa1+ 3.Ke2 Qe5+ 4.Kf1 c3 draw.)
1...Kh6 2.Kd2 (2.Rh3+? Kxg7 3.Rg3+ Kf7 4.Rb7+ Kf6 5.Rxg8 c1Q+ draw; or 2.Rb6+? Kh7)
2...Qd5+ 3.Kxc2 (3.Nd3? c1Q+! 4.Kxc1 Qh1+ 5.Kb2 Qh2+ 6.Kb1 Qxg3=)
3...Qf5+ 4.Nd3! (4.Ne4? Qxe4+ 5.Kb2 c3+)
4...cxd3+ 5.Rxd3 Qf2+!
(5...Qc8+ 6.Rc3 Qg4 7.g8R!;
7.g8R! Qc6+ 8.Kd1 Qxb5 9.Rh2+ win.
|(8) Posted by Per Olin [Saturday, Nov 6, 2010 17:08]|
The white AUW is a smashing achievement! Congratulations to the author, to our most active member for getting the dedication and to MAT PLUS Forum for getting such a study as original! I recall only one AUW in endgame studies. It is by Gady Costeff, No 16982 in EG 178 October 2009; has three white underpromotions and black promotion to queen. Are there (m)any others?
|(9) Posted by Siegfried Hornecker [Saturday, Nov 6, 2010 18:55]; edited by Siegfried Hornecker [10-11-06]|
Dear Per! The first AUW was already shown by Sigurd Clausen lots of years ago... here is the version of Didukh given in diagram.
(= 12+6 )
Nya Dagligt Allehanda 1927
Version by Sergiy Didukh, Shakhmatnaya Poezia 15.iv.2009, after a version by Siegfried Hornecker, Europa Rochade 11/2004
White to move and win
1.Bf4+! Qxf4 2.Rh5+ Kf6 3.Rh6+ Qxh6 4.Sh5+ Qxh5 5.Qg7+! Kxg7 6.f6+!, and:
- 6...Kxf6 7.f8Q+ wins
- 6...Kf8 7.e7+ Rxe7 8.fxe7+ Kxe7 9.f8Q+ wins
- 6...Kg6 7.f8R+ wins
- 6...Kh8 7.f8R+ wins
- 6...Kh6 7.f8B+ wins
- 6...Kh7 7.f8S+ wins
The AUW matrix is from Clausen, I added three white sacrifices (creating probably the first Phoenix AUW) and Sergiy Didukh saved two pawns I used.
My position: 4BQ1R/r4PN1/P3P2B/3p1Ppp/1p1P1q1k/1p6/1P6/K7 (Europa Rochade 11/2004)
Original positions by Clausen: 4B1k1/r4pP1/P3P1P1/5P1q/1p6/1p6/1P6/K7 (Nya Dagligt Allehanda 1927) - incorrect
Correction by Christer Jonsson: 1r2BQ2/5P2/4Pk2/5P1q/8/p7/P7/K7 (Tidskrift för Schack 05/1985) - incorrect
Correction by Alexander Hildebrand: 4Bk2/r4P2/P3P1P1/5P1q/1p6/1p6/1P6/K7 (Tidskrift för Schack 05/1985)
Correction by Stephen Rothwell: 4BQ2/1r3P2/4Pk2/5P1q/8/p7/P7/K7 (Europa Rochade 01/2005)
Chéron for a long time claimed to have shown the first AUW, maybe he didn't know Clausen's work. Rolf Richter worked on the theme a lot, but also some big Soviet composers worked on it. However, they all mainly used the matrix with bKg3/wKh1 and stalemate avoidances on e4.
I was lucky to judge Schach 2006-2007 where the following study won (full award can be seen with newer notes by me at http://chessproblem.net/viewtopic.php?f=28&t=358 and it is recommended to see).
(= 6+3 )
Martin Minski & Gunter Sonntag
Schach 07/2007, prize
(if 1...Kg6 2.f8Q! wins)
2.Kh5 Rxb8 3.axb8B! Qxb8 4.Re8 Qh2+
(if 4...Qxe8 5.fxe8B! wins)
(if 4...Qc8 5.f8S+! wins)
5.Sh4 Qd6 6.f8R! Qc5+ 7.Kg4 wins
I wrote that the highly economical position only allows for the highest distinction. Of course, if the masterpiece by Sergiy would have been published back then, this might "only" have gotten a honorable mention. I made, from today's viewpoint, also two other mistakes in the award (one study should not have been included and the 1st hm should have been ranked as 2nd prize). Overall it was an important experience for me.
To conclude, here is one of the famous Rolf Richter studies.
(= 10+5 )
Schach 01/1978, 1st prize (correction in Schach 08/1986)
1.d8Q! Bxd8 2.g8S! Bh4 3.h7 Sd4 4.a8R! Bf2 5.h8B! Be1 6.Rc8 wins
The original version 8/P2P2P1/3p3P/Pn1P2b1/8/k4P2/p7/K2B4 was incorrect because of 2...Bg5! 3.h7 Sd4 and for example: 4.a8R Bc1 5.Rb8 Sc2+ 6.Bxc2 Bb2+ 7.Rxb2 stalemate; or: 4.h8B Bd2 5.Bxd4 Bc3+ 6.Bxc3 stalemate, or two other variations after queen promotions.
Richter must have been well-aware of this cook a few years later,* but it seems to never have been published? It is not even in hhdbiv (study 44555).
* Evident from: Rolf Richter, Schweizerische Schachzeitung 1983, 1st prize: 4b2k/7P/8/6K1/1B2p1Np/p3P3/1p2p2p/8 (White to move and draw) with 1.Kh6 and all runs like in the cook.
|(10) Posted by Mihai Neghina [Saturday, Nov 6, 2010 21:30]; edited by Mihai Neghina [10-11-07]|
Aren't Babson tasks special AUW?
EDIT: My mistake, Babson task is not a study (yet)
|(11) Posted by Siegfried Hornecker [Monday, Sep 3, 2012 14:47]; edited by Siegfried Hornecker [12-09-03]|
To clarify: Giving the prize to the study in "Schach" was no mistake, this was badly formulated, I only meant the evaluation _might_ have changed if Sergiy's study would have been published back then since then it wouldn't have been the most economical setting.
However, two years later again, with more experience, such an AUW deserves the highest prize nonetheless.
Re Mihai: We made a tourney for Babson studies back in - I think - 2004 but got no valid entries.
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MatPlus.Net Forum Endgame studies Y. Konoval, British Chess Magazine 01/2010