Chess Problem Database Server

12 problem(s) found in 8433 milliseconds (displaying 12 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT K='Pattaufhebung' AND A='Keller, Kurt'] [download as LaTeX]

1 - P1376593
Kurt Keller
C11834 The Problemist 27-9, p. 347, 05/2020

(6+9) C+
#5

1. Dxe6? c3!
1. Dxd6? e3!
1. Dxc6? c3!, 1. ... d5!

1. Kc1? e3!

1. Sg3! droht 2. Kc1 droht 3. Le2#, 3. Dxe4#
2. ... c3, 2. ... cxd5, 2. ... exd5 3. Le2#
1. ... Kxd2 2. Dxc4 droht 3. Dc1+ Kd3 4. Le2#, 3. Sf1+ Ke1 4. De2#
2. ... Ke3 3. De2+ Kf4 4. Sxe4 droht 5. Df3#

1. ... c3 2. Da2 droht 3. Le2#
2. ... c2+ 3. Dxc2#
2. ... cxd2 3. Db3#

1. ... e3 2. Dg2 droht 3. De2#
2. ... exd2 3. Df3#
play all

C11834 (Keller) 1.Sg3 (>2.Kc1 3.Be2#) Kxd2 2.Qxc4 (>3.Qc1+) Ke3 3.Qe2+ Kf4 4.Sxe4 5.Qf3. It is bad form for the key piece to be en prise – but here the wQ does not make the key move (JGG [Jim G. Grevatt]). Very good key. I spent a lot of time looking at Qxc6,d6,e6 (VS [Victor Snaith]).

(CHAMPIONSHIP ORIGINALS. SOLUTIONS (May), in: THE PROBLEMIST, NOVEMBER 2020)

Comments:

Author – Kurt Keller (Ulm, Germany)
Note on publication: C11834 shows a black ‘Lion’s cage’, to compare with the white cage in the last issue – can the en prise wQ be justified?
(Jim Grevatt (Headly, England): CHAMPIONSHIP ORIGINALS. THREE- and MOREMOVERS, in: THE PROBLEMIST, MAY 2020)
Yet Another Chess Problem Database (507767)
MESON Chess Problem Database (228175)

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comment

Keywords: Skittles, Skittles setup (Lion's cage), Sacrifice key, Active sacrifice, Passive sacrifice, Sacrifice of white pieces, Flight-giving key, Brian Stephenson Collection (228175)
Genre: n#
Computer test: Henrik Juel: C+ Popeye 4.61 (2020-11-26)
FEN: 8/8/2ppp3/2pQp2B/P1ppp3/3k4/3P4/1K3N2
Input: Kurt Keller, 2020-06-03
Last update: Kurt Keller, 2021-02-27 more...

2 - P1380563
Kurt Keller
1649 Augsburger Allgemeine 02/10/2020

(10+4) C+
#5

1. d6! droht 2. Dc6#
1. ... a2 2. Db7 droht 3. Db3#
2. ... a1=S 3. Db1 droht 4. Dxa1 La3 5. Dd1#
3. ... Lb2 4. Dxb2 droht 5. Da2#
4. ... Sc2 5. Db3#
play all

Aufgabe Nr. 1649 (Fünfzüger
Keller): 1.d6! (droht 2.Dc6#)
1.-,a2 2.Db7 (droht 3.Db3#)
2.-,a1S 3.Db1 (droht 4.Dxa1,La3 5.Dd1#)
3.-,Lb2, 4.Dxb2 (droht 5.Da2#)
4.-,Sc2 5.Db3#.
Harmloser Löwenkäfig!

(Heinz Däubler (Amberg, Germany): Schach, in: Augsburger Allgemeine, 2020-10-17)

Comments:

Author – Kurt Keller (Ulm, Germany)
Yet Another Chess Problem Database (520193)

Mirko Degenkolbe: Wenn man auf den Käfig verzichtet (der Schlüssel spielt sich ja quasi "von selbst"), kann man den Inhalt auf das Miniaturformat herunterbrechen:
Kc4, Bb6
Ka4, Lc1, Ba3, Ba5, Bc7.
#5
In diesem weißen Minimal gibt es jetzt eine zusätzliche Verführung und ein zusätzliches Matt im Lösungsspiel.
Außerdem ist der Mattdual aus der Originalversion nicht mehr vorhanden. (2020-10-03)
Kurt Keller: Ein interessantes Problem ohne den Käfig zum Vergleich! Das Minimal enthält nicht mehr "Verführungen" als das Käfigproblem. Die einzige "Verführung" des Minimals scheitert an 6! Verteidigungszügen. Das zusätzliche Matt ist nur vierzügig. Das Ende der vollzügigen Lösung beider Probleme ist gleich. Sieht man von der Teilparade jeweils ab, gibt es keinen Mattdual. (2020-10-04)
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Keywords: Skittles, Skittles setup (lion cage), Line opening, Promotion, under-promotion, Sacrifice of black pieces, Active sacrifice
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 8/8/8/p2PPP2/k1KPQP2/p2PPP2/8/2b5
Input: Kurt Keller, 2020-10-03
Last update: Kurt Keller, 2020-10-17 more...

3 - P1384873
Kurt Keller
C17 Shakhmatnaya Kompozitsiya 154, p. 3, 12/2020
Merry Christmas & Happy New Year! Счастливого Рождества и веселого Нового года!

(8+2) C+
#4
b) -Be4

a) 1. Lc5! Kf4 2. Kg2 Kg5 3. Sh3+ Kh4 4. Lf2#
3. ... Kh6 4. Lf8#

1. La3? Kf4 2. Ld6+ Kf3 3. g5 fxg5 4. Lg4#
2. ... Kg5!

b) 1. Se4! Kf4 2. Ld6+ Kf3 3. g5 fxg5 4. Sxg5#

1. Ke1? droht 2. Ld6 droht 3. Le4#
2. ... Kg2 3. Le4+ Kg1 4. Sh3#
1. ... Kf4!

1. La3? droht 2. Lc1 droht 3. Le4+ Kf4 4. d4#
2. ... Kf4 3. d4+ Kf3 4. Le4#
1. ... Kf4 2. Ld6+ Kf3 3. Le4#
2. ... Kg5!
play all

С17. К.Келлер. a) 1.♗c5! ♔f4 2.♔g2 ♔g5 3.♘h3+ ♔h4 4.♗f2#, 3...♔h6 4.♗f8#, b) -♙e4, 1.♘e4! ♔f4 2.♗d6+ ♔f3 3.g5 fg5 4.♘:g5#.
(РЕШЕНИЯ «ШК» № 154 – 2020 [SK 154])

Comments:

Author - Kurt Keller (Ulm, Germany)
Yet Another Chess Problem Database (...)

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Keywords: Symbol problem (Christmas tree), Symmetrical position, Asymmetrical solution, Model mate, Switchback (k), Sacrifice of white pieces, Active sacrifice, Deflection, Steering, Minimal, Twin
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 5B2/8/5p2/5B2/4P1P1/5k2/3P1N1P/5K2
Input: Kurt Keller, 2021-01-02
Last update: Kurt Keller, 2021-03-30 more...

4 - P1384874
Kurt Keller
C18 Shakhmatnaya Kompozitsiya 154, p. 3, 12/2020
Merry Christmas & Happy New Year! Счастливого Рождества и веселого Нового года!

(8+8) C+
#4

1. Kd7? Kc5 2. Lxd6+ Kc4 3. La8 Kxb5 4. ?

1. Kb7! Kc5 2. Lxb6+ Kc4 3. Le8 Kxd5 4. Lf7#
play all

С18. К.Келлер. 1.♔d7? ♔c5! 1.♔b7! ♔c5 2.♗:b6+ ♔c4 3.♗e8 ♔:d5 4.♗f7#.
(РЕШЕНИЯ «ШК» № 154 – 2020 [SK 154])

Comments:

Author - Kurt Keller (Ulm, Germany)
Yet Another Chess Problem Database (...)

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Keywords: Symbol problem (Christmas tree), Symmetrical position, Asymmetrical solution, Switchback (k), Sacrifice of white pieces, Active sacrifice, Line opening, Drag-in sacrifice
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 2K5/2B5/1pBp4/pP1Pp3/p1k1p3/P1p1P3/2P5/8
Input: Kurt Keller, 2021-01-02
Last update: Kurt Keller, 2021-01-06 more...

5 - P1385091
Kurt Keller
Best Problems 97, p. 367, 01/2020
Happy New Year 2021
Šťastný nový rok 2021
С новым годом 2021
Bonne année 2021

(6+4) C+
#3 v

1. Le6+? A Kb4 a 2. Sd3+ B Ka4 b 3. Lb3# C
1. ... Kd4!

1. La6+! D Kb4 a 2. Sd3+ B Ka4 b 3. Lb5# E
1. ... Kd4 2. Sb3+ Ke4 3. Ld3#
play all

Kurt Keller – (Germania) Christmas card
2B5/2B5/2K5/8/2k5/p1p1p3/P3P3/2N5
≠3 (6+4) C+
1.♗e6+?
1…♔b4 2.♘d3+ ♔a4 3.♗b3‡ but 1…♔d4!
1.♗a6+!
1…♔b4 2.♘d3+ ♔a4 3.♗b5‡
1…♔d4 2.♘b3+ ♔e4 3.♗d3‡
Checking key, 2 model mates.

[...] We thank our colleagues who have sent us greetings from various
countries.

(Antonio Garofalo (Bari, Italy): EDITORIALE, in: BEST PROBLEMS, 2021 - January [BP097.pdf])

Comments:

Author – Kurt Keller (Ulm, Germany)
Yet Another Chess Problem Database (...)

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Keywords: Symbol problem (Christmas tree), Checking key, Model mate, Changed mates, Symmetrical position, Asymmetrical solution, Selfblock, Remote selfblock, interchange in mating position (LS (4))
Genre: 3#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 2B5/2B5/2K5/8/2k5/p1p1p3/P3P3/2N5
Input: Kurt Keller, 2021-01-07
Last update: Kurt Keller, 2021-01-30 more...

6 - P1385337
Kurt Keller
1562 Troll 3 20/01/2021

(3+3) C+
#6

1. Te6! c4 2. Kb4 c3 3. Kb3 c2 4. Tc3 c1=D,T,L,S 5. Txc1 Kd3 6. Td1
3. ... Kc5 4. Txc3+ Kb5 5. Tec6 droht 6. T3c5#
4. ... Kd4 5. Tc1 Kd3 6. Td1#
play all

Aufgabe Nr. 1562 (Keller [Ulm, Germany]) 1. Te6! (Zugzwang) 1...c4 2. Kb4 c3 3. Kb3 c2 4. Tc3 c1D 5. T:c1 Kd3 6. Td1, 3...Kc5 4. Tc3+ Kb5 5. Tc6 nebst 6. Tc5 matt, 4...Kd4 5. Tc1 Kd3 6. Td1 matt. (4 Punkte)
(Udo Degener, Grandmaster of Chess Composition (Potsdam, Germany), Unsere Schachseite. Lösungen aus Troll 3/21, in: TROLL 6 2021, p. 28, 2021-03-03 [2021TRO.pdf])

Comments:

Yet Another Chess Problem Database (528623)

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Keywords: Miniature, Model mate, Square vacation, Selfblock, Promotion, under-promotion, Line opening
Genre: n#
Computer test: Henrik Juel: C+ Popeye 4.61 (2021-01-15)
FEN: 8/8/8/1Kpp4/3k4/7R/8/4R3
Reprints: 43) idee & form 161, p. 5451, 01/2024
Input: Rainer Staudte, 2021-01-13
Last update: Gunter Jordan, 2024-03-12 more...

7 - P1386359
Kurt Keller
C11885 The Problemist 28-1, p. 15, 01/2021
New Year greetings

(8+1) C+
#4

Only two #3s this time, and no excessively long moremovers. [...] Keller presents with New Year greetings a symmetrical Christmas tree – but the 2 variations are not symmetrical.
(Jim Grevatt (Headly, England): CHAMPIONSHIP ORIGINALS. THREE- and MOREMOVERS, in: THE PROBLEMIST, JANUARY 2021)

Comments:

Yet Another Chess Problem Database (...)
Meson Chess Problem Database (249089)

Rosalie Fay: 1. Ld2 zz Kf4 2. Sf1+ Kg4 3. Te4+ Kh5 4. Sg3#;
1. ... Kd4 2. Kd6 zz Ke4 3. Tf2 zz Kd4 4. Tf4#
C+ Popeye Windows-64Bit v4.69 (2023-12-31)
comment

Keywords: Symbol problem (Christmas tree), Option key, Rex solus, Switchback (k), Model mate, Battery creation, Battery play, Discovered check, Batterieabbau (Te2/Se3), Symmetrical position, Asymmetrical solution, Brian Stephenson Collection (249089)
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 8/8/4K3/3P1P2/4k3/4N3/2P1R1P1/4B3
Input: Kurt Keller, 2021-02-10
Last update: Kurt Keller, 2021-07-20 more...

8 - P1392454
Kurt Keller
2021/50 Schach in Schleswig-Holstein 2021/08 08/2021

(4+7) C+
#4

1. Tdg2? a4?
1. ... h2!

1. Tgg2! droht 2. Se3 droht 3. Sf5#
2. ... h2 3. Sf5+ Kh3 4. Txg3#
2. ... hxg2+ 3. Kxg2 a4 4. Sf5#

1. ... h2 2. Td3 a4 3. Ta3 Kh3 4. Txh2#
1. ... hxg2+ 2. Kxg2 a4 3. Se3 a3 4. Sf5#
play all

Liebe Löser, nach der letzten Serie, die es in sich hatte, kommt dieses Mal etwas leichtere sommerliche Kost.
(Winus Müller (Rathjensdorf, Germany): Problemschach, in: Schach in Schleswig-Holstein, 2021-08)

Die Lösung zur Aufgabe 2021/50 (Kurt Keller [Ulm, Germany]) lautet: 1. Tgg2! (ZZ) a4 2. Se3 h:g2 3. K:g2 a3 4. Sf5# oder 2. … h2 3. Sf5+ Kh3 4. T:g3#, sowie 1. ... h2 2. Td3 a4 3. Ta3 Kh3 4. T:h2# und 1. ... h:g2 2. K:g2 a4 3. Se3 a3 4. Sf5#. „Bereits von der Ausgangsstellung her (Drohung g2+) nicht befriedigend!“ (Baldur Kozdon). „Variantenreich mit sehr ansehnlichen Matts. Gefiel mir ausgesprochen gut“ (Claus Grupen). „Optisch ganz nett und mit drei Varianten auch inhaltlich zufriedenstellend, trotz des unterbeschäftigten Turm auf d2“ (Hanspeter Suwe). „Wie bricht man die schwarze Randkegelfestung auf? Das ungedeckte Satzschach 1. … g2+ gibt den Fingerzeig. Der Clou ist die Vorausfesselung 2. Td3!“ (Stephen Rothwell).
(Winus Müller: Problemschach. Lösungen zu SSH 08/2021, in: Schach in Schleswig-Holstein, 2021-10)

Comments:

Yet Another Chess Problem Database https://www.yacpdb.org

A.Buchanan: Hi Kurt thanks for posting this - great stuff! Particularly you are showing how we can raise the bar in terms of html formatting: I will definitely follow your lead. Couple of thoughts...

It's not standard practice to have external clickable links within PDB comment, particularly where the details are replaced by "..." Although stackexchange etc support it, I'm sure they have much more stringent behind-the-scenes security-checking. No problem with having a url though!

And given that YACPDB has about 500K compositions, I don't think we need to indicate that YACPDB contains a particular composition. In the long term, maybe references can be standardized with YACPDB & WinChloe, but in the mean time, if I need to (e.g. suspicious about a diagram) it's easy to check whether a problem appears in one of the other systems. (2021-10-25)
comment

Keywords: Option key, Sacrifice key, Selfblock, Block, Skittles, Skittles setup, Pin, Pinning, Annihilation
Genre: n#
Computer test: Popeye Windows-32Bit v4.63 (512 MB)
FEN: 8/8/8/p5pp/6pk/6pp/3R4/3N2RK
Input: Kurt Keller, 2021-08-04
Last update: A.Buchanan, 2021-10-25 more...

9 - P1394681
Kurt Keller
13136 Probleemblad 79-3, p. 13133, 07-09/2021

(4+3) C+
#5vv

1. Th4? d4 2. Sd2 droht 3. Th3#
2. ... Ke3 3. Sb2 droht 4. Sd3 droht 5. Th3#
3. ... d3 4. Ke1 d5 5. Sd1#
3. ... Kf2! 4. Sd3+?

1. Tb4? d4 2. Sd2? droht 2. Tb3#
2. ... Ke3! 3. Sb2?

1. Sb2+? Kc3!
1. Sd2? Ke3!

1. Ke1? droht 2. Kd1 d4 3. Sd2 droht 4. Tf3#
1. ... d4 2. Sd2 droht 3. Kd1 droht 4. Tf3#
2. ... Kc2 3. Txd4 droht 4. Txd6 Kc1 5. Tc6#
3. ... d5 4. Txd5 Kc1 5. Tc5#
1. ... Kc2!

1. Tg4! d4 2. Sd2 droht 3. Tg3#
2. ... Ke3 3. Sb2 droht 4. Sd3 droht 5. Tg3#
3. ... d3 4. Ke1 d5 5. Sd1#
play all

13136 Keller 1.♖h4? d4 2.♘d2 [3.♖h3#] ♚e3 3.♘b2 [4.♘d3 5.♖h3#] d3 4.♔e1 d5 5.♘d1#, 3… ♚f2! 4.♘d3+?; 1.♖b4? d4 2.♘d2? [2.♖b3#] ♚e3! 3.♘b2?; 1.♖g4! d4 2.♘d2 [3.♖g3#] ♚e3 3.♘b2 [4.♘d3 5.♖g3#] d3 4.♔e1 d5 5.♘d1#. “White correction because of 1.♖f4? d4!, maybe also 1.♖b4? d4! for White correction” (componist). A small change of game (MC [Myloka Chemiaskyi]).
(Henk Prins (Sliedrecht, the Netherlands): Originele Problemen en Oplossingen. Oplossingen orthodox 2021-3 (juli-september), in: PROBLEEMBLAD, januari-maart 2022)

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Keywords: Miniature, White correction, Square vacation, Selfblock
Genre: n#
Computer test: Henrik Juel: C+ Popeye 4.61 (2021-10-17)
FEN: 8/8/3p4/3p4/N4R2/3k4/8/3K1N2
Input: Rainer Staudte, 2021-10-17
Last update: Kurt Keller, 2022-04-03 more...

10 - P1402955
Kurt Keller
3675 ChessStar 23/07/2022

(2+5) C+
h#5

1. a4 bxa4+ 2. Kc4 a5 3. Kb5 a6 4. Ka5 a7 5. b5 a8=D,T#
play all

Comments:

Author – Kurt Keller (Ulm, Germany)
Original problem (ChessStar-2022)
Solution text (ChessStar)
Compare P1388082

SCHRECKE: Umwandlungsdual (a8T#) im Hilfsmatt ist nicht jedermanns Sache - meine auch nicht! (2022-07-23)
Henrik Juel: so the problem is not C+... (2022-07-23)
Kurt Keller: see keyword "tolerated dual promotion":
"Sometimes, the mating move is a promotion, and both D/T would mate. Similarly, sometimes D/L would both work. This is a tolerated dual under Article 13 of the Codex, because if it were not allowed, too many matrices would be invalid."
Article 13 (https://www.wfcc.ch/1999-2012/codex/):
"(2) Help-play compositions are unsound also if they are dualized, except that in the final move a promotion into different pieces having partially the same power (for example queen/rook or queen/bishop) may be tolerated [16]."
Therefore, the problem is sound (C+). (2022-07-23)
comment

Keywords: Symbol problem (cross), Kindergarten Problem, Minimal (B), Miniature, Symmetrical position, Asymmetrical solution, Sacrifice key, Sacrifice of black pieces (active), Active sacrifice, White correction (for Black), Selfblock, Switchback (k), Promotion in the mating move, Tolerated dual promotion (D/T)
Genre: h#
Computer test: Gustav 4.1 d
FEN: 8/1K6/1p6/pkp5/1p6/1P6/8/8
Input: Kurt Keller, 2022-07-23
Last update: Kurt Keller, 2022-10-28 more...

11 - P1406712
Kurt Keller
12857 feenschach 250, p. 1023, 10-12/2022
Frohe Ostern

(3+5) C+
h=4
b) an der mittleren Horizontale gespiegelt (Kc1/Kc3)

a) 1. b5 Kd8 2. bxc4 Ke7 3. Kd5 Kf6 4. c6 Kf5=
b) 1. Kb4 Le4 2. Ka3 Lxd3 3. Ka2 Lxc4 4. Ka1 Lxb3=
play all

Comments:

Author – Kurt Keller (Ulm, Germany)
Für den Ostergruß wurde das Problem offensichtlich zu früh gebracht. Das Problem selbst ist jedoch für die Weihnachtszeit geeignet, da die beiden Kreuze auch als Weihnachtsbaum oder Kerze betrachtet werden können. (The problem was obviously brought up too early for the Easter greeting. However, the problem itself is suitable for the Christmas season because the two crosses can also be considered a Christmas tree or candle.) Vergleiche (Compare) P1388082
Source: Urdruckteil_250.pdf on http://www.feenschach.de

Henrik Juel: solutions
a) 1.b6-b5 Kc8-d8 2.b5*c4 Kd8-e7 3.Kc6-d5 Ke7-f6 4.c7-c6 Kf6-f5 =
b) 1.Kc3-b4 Bc6-e4 2.Kb4-a3 Be4*d3 3.Ka3-a2 Bd3*c4 4.Ka2-a1 Bc4*b3 = (2022-12-14)
comment

Keywords: Symbol problem (Doppelkreuz), Twin, Asymmetrical solution, Selfblock, Passive sacrifice, Annihilation, Remote selfblock, Sacrifice of white pieces, Sacrifice of black pieces, Active sacrifice (L), Symbol problem (Kerze), Symbol problem (Weihnachtsbaum)
Genre: Fairies
Computer test: Gustav 4.1 d
FEN: 2K5/2p5/1pkp4/2p5/2P5/2B5/8/8
Input: Kurt Keller, 2022-12-14
Last update: Kurt Keller, 2023-01-06 more...

12 - P1408699
Kurt Keller
Best Problems 106, p. 617, 04/2023
Happy Easter 2023

(7+3) C+
s#6

1. Ld4! Kh6 2. Dxg7+ Kg5 3. Df6+ Kh6 4. Kh4 Kh7 5. Df7+ Kh6 6. g3 g5#
play all

Comments:

Author – Kurt Keller (Ulm, Germany)
Original problem with solution on http://www.bestproblems.it (BP106.pdf)
Set of three Easter problems (hs#,s#,h#) with P1408698 and P1408700
The size of the symbols decreases by one square each in the order 2-1-3.

more ...
comment

Keywords: Symbol problem (Osterkreuz - 2), Symbol problem (Petruskreuz), Symbol problem (Osterkerze)
Genre: Fairies
Computer test: Gustav 4.1 d. Henrik Juel: C+ Popeye 4.61 also (2023-04-05)
FEN: 6Q1/6p1/6p1/6k1/6P1/5PKP/6P1/6B1
Input: Kurt Keller, 2023-04-05
Last update: Kurt Keller, 2023-04-05 more...

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The problems of this query have been registered by the following contributors:

Kurt Keller (10)
Rainer Staudte (2)