Die Schwalbe

15 problem(s) found in 6150 milliseconds (displaying 15 problem(s)). [COMMENTDATE>=20220810 AND G='Retro' AND NOT A='Nouguier, Henri' AND K='Aristokrat'] [download as LaTeX]

1 - P0000136
Dmitri W. Pronkin
Andrey Frolkin

6631v Die Schwalbe 117 06/1989
Preis
P0000136
(14+14)
BP in 57.5
1. a4 h5 2. a5 h4 3. a6 h3 4. axb7 hxg2 5. h4 d5 6. h5 d4 7. h6 d3 8. h7 dxc2 9. d4 a5 10. Lh6 c1=T 11. e4 Tc5 12. Se2 Th5 13. e5 c5 14. e6 Sc6 15. b8=T a4 16. Tb4 a3 17. Ta4 c4 18. b4 c3 19. b5 c2 20. b6 c1=T 21. b7 Tc4 22. b8=T Da5+ 23. Tbb4 Lb7 24. S1c3 0-0-0 25. exf7 e5 26. Tc1 Lc5 27. f8=T a2 28. Tf3 a1=T 29. Sa2 g1=T 30. Tfa3 Tg6 31. f4 Te6 32. f5 g5 33. f6 g4 34. f7 g3 35. f8=T g2 36. Tf5 g1=T 37. Lf8 Tg7 38. Sg3 e4 39. Ld3 e3 40. 0-0 e2 41. Tcc3 e1=T 42. Lc2 T1e3 43. d5 Tdd7 44. d6 Tdf7 45. d7+ Kb8 46. Dd6+ Ka8 47. Dc7 Sge7 48. d8=T+ Sc8 49. Tdd3 Thg8 50. h8=T Tae1 51. Th6 T1e2 52. T1f2 Tce4 53. Kf1 Ld4 54. Tfc5 Se5 55. Sf5 Sc4 56. Sd6 Sb2 57. Tbc4 Sb6 58. Db8+
play all play one stop play next play all
Der absolute KBP-Längenrekord.
See P1338946 cooked.
paul: Compare with P0002278 & P0002279 (2010-04-30)
Mu-Tsun Tsai: This one is by far the toughest retro I've ever solved. Very little certain information can be determined by structural consideration alone, even with long and complicated argument. It took me five days to complete solving this. (2012-07-22)
A.Buchanan: @Mu-Tsun: that's an interesting data point - thanks for posting. (2017-09-07)
Henrik Juel: The current record is 58.5 moves in a proof game problem by the authors + Keym, Die Schwalbe 2017 (2017-09-07)
Henrik Juel: I just learned that the 58.5 move proof game has been cooked... (2017-09-07)
A.Buchanan: In retrospect, my earlier comment about "interesting data point" is a bit weak. It's actually great that for such an extreme problem, someone took substantial time to independently validate it. It's like doing science: people want to do their own new stuff, and are unwilling to take the time to validate what's already been claimed. This one has survived 30+ years, and maybe the use of constraints e.g. in Jacobi can eventually allow it to be HC+. (2021-05-29)
Olaf Jenkner: This problem is the current record, because P1338946 (58.5 moves) has been cooked. (2021-11-25)
Reto: This is C+ up to 51.0 moves with Stelvio 2.0. This ties the record for partial testing of an SPG. Took 1200 CPU hours of strategy seeking (finding 378 0+0 strategies) and another 13h of strategy playing these strategies. If this can ever be completely solved, then it needs to be the case that all strategies have 0+0 free moves, otherwise playing is utterly hopeless.
@Andrew: There is absolutely no way a brute-force based program like Jacobi ever stands a chance at solving something like this, no matter how many conditions you add. (2023-12-14)
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Keywords: Unique Proof Game, Move Length Record, Non-standard material (TTTTTTtttttt), Castling, Aristocrat, Superseded by (P1397486)
Genre: Retro
FEN: kQ3Br1/1b3rr1/1n1Nr2R/q1R4r/R1Rbr3/R1RRr3/NnB1rR2/5K2
Reprints: 584 Ukrainisches Album 1986-1990
86 Shortest Proof Games 11/1991
(6) diagrammes 103 10-12/1992
H18 FIDE Album 1989-1991 1997
feenschach 137, p. 368, 08-09/2000
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-12-25 more...
2 - P0000763
Lothar Finzer
1159 Die Schwalbe 24 12/1973
P0000763
(12+12) C+
#3
Schwarz hat keinen letzten Zug, daher beginnt er (und setzt in 3 Zügen matt):
1. ... T3d2+ 2. Lexd2 Txd2+ 3. Lxd2 Ta1#,Db3#; 3. Lb2 Txb2#,Db3#; 3. Kb1 Txc1#
Verführung: 1. Ta5+? Kxb4 2. Sc6+ Kc4 3. Tc5#
play all play one stop play next play all
Die Umwandlung aller 16 Bauern in schwarzfeldrige Läufer bzw. in Türme erforderte alle 8 Schlagfälle, und zwar so, daß alle Umwandlungsfiguren auf schwarzen Feldern entstanden. Deshalb kann zuletzt auch keine schwarze UW erfolgt sein.
Joaquim Crusats: Can anyone explain the intention? (2013-01-06)
Henrik Juel: The eight white pawns captured the four missing black officers and promoted on b8, d8, f8, and h8; the eight black pawns captured the four missing white officers and promoted on a1, c1, e1, and g1.
If White had the move, 1.Ta5+? Kxb4 2.Sc6+ Kc4 3.Tc5 would mate in three.
But Black has no last move, so he has the move and mates in three by 1... T3d2+ 2.Lexd2 Txd2+ 3.Kb1 Txc1# (2013-01-06)
A.Buchanan: This is one of a number of problems which had been given both "No legal last move for..." & "Whose move?" keywords. These should correspond respectively to two situations: (1) Codex Article 15 where we add or remove a single move from the beginning of the solutions, but the mating party remains the same. (2) A kind of one-sided duplex, where who moved last implies who delivers the mate (or other final move).
So at most one of the two keyword forms can ever logically apply to a problem. Therefore I have removed the incorrect "No legal last move for Black" keyword.
We might replace "Whose move?" by "Halfduplex", which is related to the Popeye option. What do you think? (2023-11-28)
A.Buchanan: This is a nice problem. There are some final move duals for the actual solution, but all missing units are needed to justify promotions (2023-11-28)
Henrik Juel: Halfduplex is a bit too technical for my taste, although it describes the goings on well (2023-11-28)
A.Buchanan: Thanks Henrik - I'll leave the term "Whose move?" as it is then. (2023-11-28)
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Keywords: Non-standard material (LLLLLLLLtttttttt), Whose move?, Aristocrat
Genre: Retro, 3#
Computer test: HC+ Popeye v4.87 (subject to final move duals) with simple retro logic
FEN: 8/N7/8/2R1B1B1/kB1BrBrB/2qrrrrr/K7/2BrBrBr
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-11-28 more...
3 - P0002735
Theodor Steudel
3511 Problemkiste 95 10/1994
P0002735
(1+1) C+
(-1w -1s)*, dann h=1
2 Lösungen
R: 1. Kh2-g1 Kg4xDf3, dann 1. Kh4 Df5=
R: 1. Kf1-g1 Kg3xDf3, dann 1. Kh2 Kf2=
"set play" ( -s, dann h=1 )
R: 1. Ke2xDf3, dann 1. Ke1 Dd3=
play all play one stop play next play all

Duplicate Diagram: P1187070

Adrian Storisteanu: Is the star "*" in the stipulation supposed to indicate a kind of "set play" in the retro part -- in effect a "-1s dann h=1"? Because there is one:
- 1.Ke2xQf3 & 1.Ke2-e1 Qf3-d3=. (2015-08-02)
A.Buchanan: That's a clever interpretation Adrian, I am sure you are right, and it's sound according to Deadpos (2024-01-13)
Adrian Storisteanu: A more precise stipulation would be something like: (-w -s)*, dann h=1 (2024-01-14)
A.Buchanan: Good idea. The convention is that * promises at least one set play instance. (2024-01-15)
comment
Keywords: Help retractor, only Kings, Aristocrat, Miniature
Genre: Retro, Fairies
Computer test: C+ Deadpos v2.3 14-Jan-2024
FEN: 8/8/8/8/8/5k2/8/6K1
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-18 more...
4 - P0003539
Hilding Fröberg
332 Land og Folk 01/03/1970
P0003539
(4+2) C+
h#1.5
1. ... Sf5? 2. 0-0-0?? Sd6# - aber die s0-0-0 ist illegal, den zuletzt muß Schwarz mit K oder T gezogen haben.

1. ... Sg8! 2. Td8 Sc7#
play all play one stop play next play all
Mario Richter: Luboš Kekely (Slovakia) correctly points out that 1. ... Sf5! 2. 0-0-0 Sd6# is only a try and not a solution (last black move must have been by King or Rook, so the queenside castling is illegal).
I have changed the solution accordingly. (2023-03-10)
comment
Keywords: Cant Castler, Castling (sg), Aristocrat, Minimal, Miniature, Homebase
Genre: h#, Retro
Computer test: HC+ Popeye v4.87 & trivial retro-logic | C+ rawbats
FEN: r3k3/6K1/N6N/8/8/7B/8/8
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2023-03-10 more...
5 - P0004066
S. N. Ravishankar
2069 diagrammes 89 04-06/1989
P0004066
(2+1)
#1 vor 6
VRZ, Typ Proca
R: 1. Ke2xLf1 ~ 2. Kd3xLe2 ~ 3. Kc4xLd3 ~ 4. Kb5xLc4 ~ 5. Kb6-b5! ~ 6. Sa6xSb8, dann 1. Sc7#
play all play one stop play next play all
S N Ravi Shankar: This problem is not mine. (2019-01-02)
Mario Richter: My first guess for the solution was:
R: 1. Ke2xLf1 2. Kd3xLe2 3. Kc4xLd3 4. Kb5xLc4 5. Ka6xLb5 Lc6-b5+ 6. Sd7xLb8, dann 1. Sb6#, but that doesn't work because of 5. ... Ld7-b5+!
Does someone see (or know) the correct solution? (2019-01-03)
Henrik Juel: No, because with 1... Lh3-f1+, 5.Ka6-b5 thr. 6.Sd7xLb8 fails similarly on 5... Ld7-h3 (2019-01-03)
S N Ravi Shankar: Does adding a black knight on e6 cure? 1. Ke2xLf1 2. Kd3xLe2 3. Kc4xLd3 4. Kb5xLc4 5. Ka6-b5! followed by 6. Sd7xLb8 and now 1. Sb6#. (2023-02-20)
S N Ravi Shankar: The problem appears to be sound. 1.Ke2xLf1 2.Kd3xLe2 3.Kc4xLd3 4.Kb5xLc4 5.Kb6-b5! followed by 6.Sa6xSb8 and now 1.Sc7#. (2024-02-18)
A.Buchanan: WinChloe also gives the same composer. A curious situation, but at least the problem attributed to you appears to be sound! (2024-02-19)
Adrian Storisteanu: Above the "diagrammes" diagram there is: R. SHANKAR, Inde. In the volume index, under RETROS: this is the only problem of a composer named (just) "SHANKAR" (one original), while "RAVI SHANKAR" is a different author (with two originals). (2024-02-20)
A.Buchanan: I suggest that S.N.Ravishankar check the reaponse to the query (A='Shankar' or a='Ravishankar') AND NOT A='Shankar Ram, Narajan' as there are many other similar retros which are attributed to Ravishankar. If he can state here which ones are not his, I will happily modify the data. (2024-02-21)
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Keywords: Defensive Retractor, Type Proca, Rex solus (s), Aristocrat, Minimal, Miniature
Genre: Retro
FEN: kN6/8/8/8/8/8/8/5K2
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-02-21 more...
6 - P0005387
Nikita M. Plaksin
6557 feenschach 109 11/1993
P0005387
(2+2) C+
-1w, dann =1
R: 1. Ka3-a4?, dann 1. Lxa2=
R: 1. Ka3xBa4!, dann 1. Lxa2=
play all play one stop play next play all
Mit folgender witziger Begründung des Autors: "If on the board are only KL-KL (and LL on squares of the same colour), by the rules of chess an immediate draw occurs! Therefore, the retro move Ka3-a4 is illegal." Ein Fehllöser: "Reichlich trivial." Ein Ratloser: "... oder wie darf ich das sehen?" TK hatte den Durchblick: "Die doppelte Rücknahmemöglichkeit kann man aber gar nicht übersehen (und schon gar nicht der Autor). Einzige Möglichkeit: nur Ka3xBa4, weil andernfalls die Stellung schon vorher patt wäre. Aber, aber: das ist remis, kein Patt!!" FR: "Meine 'Ehrenlösung' für diese Gruppe (hoffentlich stimmt sie auch)." WM: "Nette Pointe. Das erzähl' ich meinen Kindern, daß ich einen PLAKSIN gelöst habe." 1,2/I
A harbinger of Dead Reckoning-style reasoning, before that rule ever existed. As sound today in 2018, as when it was composed under "insufficient material for mate" rule.
Henrik Juel: Nice to see that I am not the only freak who mixes english text with german notation (to avoid the ambiguous B)
Were you inspired by this problem in your work on Dead Reckoning, Andrew? (2020-05-04)
A.Buchanan: Ha no: when I stumbled across DP rule I knew even less about chess problems than I know now, if you can imagine, and had never encountered this one which Werner Keym unearthed and published it in "Out Of the Box". Ecclesiastes 1:9 says "There is nothing new under the sun." Mario made this point about origin of Schnoebelen promotions too. Gollon's intepretation of Chaturanga (the earliest known forebear of chess) offers fascinating possibilities for Schnoebelen promotion, which I am sure the Indian retrograde analysts of 7th Century CE were adept at exploiting, in tablets alas now lost. See https://www.chessvariants.com/historic.dir/chaturanga.html.

The "insufficient material" composition does perhaps explain Plaksin's openness to the concept of DP, at a time when perhaps some noses elsewhere were being turned up, as he later composed with Kornilov *27* other DP problems, all to be found in PDB. (2020-05-04)
Ladislav Packa: Interesting, but on YouTube I saw a game (one of the actors was Magnus Carlsson), which ended in a position with only two kings and one of the players still made a move. (2020-05-05)
A.Buchanan: http://wismuth.com/chess/illegal-moves.html contains many other games where GMs were unable to tear themselves away from playing the dead game. I think it's kind of sweet that the GMs just can't stop playing. Have you got a link to the Carlsen game please, Ladislav? (2020-05-06)
Ladislav Packa: I'm sorry, Andrew, but I don't remember. I've seen hundreds of games on youtube. But I encountered similar cases in my own practice, mostly a joke, and the game immediately ended with a smile and a handshake. (2020-05-06)
A.Buchanan: A completely different stipulation: -w, h=1 half-duplex (2024-01-11)
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Keywords: Help retractor, Dead Position, Aristocrat, Miniature, Minimal
Genre: Retro, Fairies
Computer test: C+ deadpos v2.1 8-Jan-2024
FEN: 8/8/8/8/K7/8/b7/kB6
Reprints: 440 Out Of the Box , p. 141, 2018
www.thbrand.de 14/01/2018
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-18 more...
7 - P0006339
Yosif Krikheli
8945 FEENSCHACH 09-10/1968
P0006339
(1+1) cooked
-1w -1s, dann h=1
2 Lösungen
1) R: 1. Kc5xDd6 Dd7xDd6, dann 1. Dc6 Dxc6=
2) R: 1. Kc5xBd6 c7xDd6, dann 1. c6 Dxc6#
play all play one stop play next play all
siehe 9200
mri: Mehrere NL, z.B. R: Kc6xLd6 Lc5xDd6 V: 1.Ka5-a6 Dd6xc5 oder R: Kc5xTd6 Tb6xDd6 V: 1.Tb6-c6 Dd6xc6 (2007-10-25)
Mario Richter: s. P0005054 (2009-12-31)
A.Buchanan: Reasonable to suppose that P0005054 is the correction (2024-01-15)
comment
Keywords: Help retractor, only Kings, Aristocrat, Miniature, Superseded by (P0005054)
Genre: Retro, Fairies
Computer test: C- Deadpos v2.3 14-Jan-2024
FEN: 8/8/3K4/k7/8/8/8/8
Input: Gerd Wilts, 1995-09-10
Last update: A.Buchanan, 2024-01-18 more...
8 - P0008784
Niels Høeg
The Chess Amateur 07/1926
P0008784
(1+1)
Längste BP ohne Schach. Welches war der letzte Zug?
R: 5899. Kg2xTh1
play all play one stop play next play all
The game ends after 50 consecutive moves without captures or pawn moves (loss of castling right is not included here), or when there is not enough material to mate (say K-K or K-KS). There are 30 captures and 96 pawn moves (including 8 pawn captures) available, so the longest game seems to last (30+96-8)x50=5900 moves. This cannot be achieved because of the move-loss when the draw-preventing move shifts between white and black. Niels Høeg believed that 2 moves were lost and stated the solution as 5898.- Kb7xTa8. Karl Fabel later showed that only 1.5 moves need be lost.

Since 1926, there have been some relevant innovations to rules and conventions
(1) 50 move rule applies only to retro compositions, and will trigger automatically (no issue with writing down the move). (Codex 1953?)
(2) Removal of rules about draw by insufficient material (Laws 1997)
(3) Dead position rule introduced (Laws 1997)
(4) 75 move rule introduced (Laws 2014)
(5) Dead position rule applies only to retro compositions (Codex 2015)
(6) Articles 9.2 & 9.3 apply to chess problems - this includes 50 move rule and excludes 75 move rule (Codex 2019)

This is certainly a composition rather than a question about over the board chess. And it is certainly a retro composition. So the 50 move rule will dominate the 75 rule. The standard interpretation of interaction between 50 move rule and Dead Position in compositions is that Dead Position assessment *is* aware of looming automatic draw by 50 moves. (Note there is a similar assessment for interaction between Dead Position and Draw by Repetition.)

So we can argue that the game cannot last to 5898.5 moves, because the final move leads to a mandatory draw: either the king captures the last officer, or the king avoids the capture and the game ends in draw under the 50 move rule. So the position is dead at 5898.0. But even 5898.0 is too long for the diagram position with the kings so far apart. In the alternate reality if the last capture of a rook does not take place, there must be sufficient moves left for the kings to come together so that the rook can deliver checkmate. This will take at least 6.0 moves.

There is also still an ambiguity in the rules as to whether checkmate overrides draw by 50 moves. This is explicitly mentioned in the 75 move rule, but not in 50 move rule. I assume that checkmate *does* take priority.

Or does a valid problem only exist in the context of the rules and conventions that pertained at the time of its composition? The Codex does not opine on this general point.

Compare P1331022

Duplicate Diagram: P1101148, P1189676, P1191185, P1304589

A.Buchanan: There's a question whether DP rule has visibility of 3Rep & 50M state. The current consensus among most of the tiny group who might care is that for retros, it does have visibility, but for purely forward problems, it does not. This align with the idea that by default 50M & DP rules apply only to retros (2023-09-06)
A.Buchanan: The old intended interpretation is protected under the Golden Age principle. Suppose we do apply modern rules, codex & clarifications. If Black just played Kb7xRa8, then the alternative leading to mate takes 7.0 moves, so this must have been Black's 5892nd move at the latest. If White just moved, then it was White's 5892nd at latest. So to maximize the length of the game, Black moved last. (2023-09-06) edit (2023-09-06)
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Keywords: Longest Proof Game, Last Move?, only Kings, Non-Unique Proof Game, Dead Position, 50 move rule, Constrained problem, Type A, Miniature, Golden Age (pre-dead), Aristocrat
Genre: Mathematics, Retro
FEN: k7/8/8/8/8/8/8/7K
Reprints: Schackproblemet 1928
Schach und Zahl 1966
Input: Gerd Wilts, 1997-06-20
Last update: A.Buchanan, 2024-01-18 more...
9 - P1001360
Wilfried Neef
Hans-Peter Reich

Andernach TT 2001
3. Lob
P1001360a_1.png
(a: 2+2)
P1001360a_2.png
(a: 2+2)
A nach B in 9,5*
Beamtenschach
* 1. ... Tg1-f1+ 2. Kf2-e2 Tf1-d1 3. Sh1-f2 Td1-f1 4. Sf2-d1+ Kb2-a1 5. Sd1-c3 Tf1-e1+ 6. Ke2-d2 Te1-c1 7. Sc3-b5 Tc1-b1 8. Sb5-a3 Tb1-b2 9. Kd2-c1 Tb2-a2 10. Sa3-c2#
1. Sh1-g3 Tg1-f1+ 2. Kf2-e3 Tf1-f3+ 3. Ke3-e2 Tf3-c3 4. Sg3-e4 Tc3-c2 5. Ke2-d1 Tc2-c4 6. Se4-d2 Tc4-c2 7. Sd2-c4+ Kb2-a1 8. Sc4-a3 Tc2-d2+ 9. Kd1-c1 Td2-a2 10. Sa3-c2#
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 PG demolition mode
Notation B: 8/8/8/8/8//8/r1N5/k1K5 (2022-08-11)
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Keywords: A to B, Functionary Chess, Aristocrat
Genre: Fairies, Retro
FEN: 8/8/8/8/8/8/1k3K2/6rN
Reprints: feenschach 140 04-05/2001
Input: Gerd Wilts, 2001-09-04
Last update: Alfred Pfeiffer, 2019-03-26 more...
10 - P1112386
Mrs. W. J. Baird
(2) British Chess Magazine , p. 136, 03/1903
P1112386
(1+1) C+
Hilfsrückzüger
siehe Text
R: 1. Kf6xBg6, dann 1. ... Kh8 Kf7, dann R: sBh7xBg6, dann 2. ... g7#
play all play one stop play next play all
Originalforderung: 1) White to retract his last move 2) Black to play 3) White to play 4) Black retract a previous move so that 5) White can give mate with Pawn.
A.Buchanan: Deadpos v2 can now solve this, even though PDB animation can't manage to show it:
6k1/8/6K1/8/8/8/8/8 b }}= r1 }}= flip }}= m2 }}= flip }}= r1 }}= flip }}= #1 (p)
h5xRg6 flip then g8h7 h5h4 flip h6xPh7 flip then h7h8q#
f5xRg6 flip then g8h7 f5f4 flip h6xPh7 flip then h7h8q#
g5xPg6 flip then g8h7 g5f6 flip h6xPh7 flip then h7h8q#
g5xPg6 flip then g8h7 g5f6 flip h6xPh7 flip then h7h8r#
g5xPg6 flip then g8h7 g5h4 flip h6xPh7 flip then h7h8q#
g5xPg6 flip then g8h7 g5g4 flip h6xPh7 flip then h7h8q#
g5xPg6 flip then g8h7 g5f4 flip h6xPh7 flip then h7h8q#
f6xPg6 flip then g8h8 f6f7 flip h7xPg6 flip then g6g7#
nsols 8 (2024-01-05)
comment
Keywords: only Kings, Help retractor, Aristocrat, Miniature
Genre: Retro
Computer test: C+ deadpos v2.0
FEN: 6k1/8/6K1/8/8/8/8/8
Input: Frank Müller, 2010-08-06
Last update: A.Buchanan, 2024-01-05 more...
11 - P1131766
Fr. Mendel
89 150 Schachkuriositäten 1910
P1131766
(5+1) cooked
-1w, dann #2
R: 1. b7-b8=S, dann 1. Ld8 Ka6 2. b8=S#
R: 1. b7-b8=S, dann 1. Ld8 Kb8 2. Sc6#
play all play one stop play next play all
Cook: R: 1. Sa6-b8, dann 1. Lc5+! Kxa6 2. Ta7#
R: 1. Sa6-b8, dann 1. Lc5+! Ka8 2. Ta7#
Henrik Juel: The forward play is 1.Ld8 Ka6/Kb8 2.b8=S/Sc6# (2022-10-14)
comment
Keywords: Miniature Collection (0011852), Help retractor, Aristocrat, Miniature, Promotion in the retro play (S), Promotion in forward play (S)
Genre: 2#, Retro
FEN: 1N6/k3BR2/8/8/3N4/2K5/8/8
Input: Felber, Volker, 2010-09-11
Last update: A.Buchanan, 2024-01-18 more...
12 - P1294321
Andrew Buchanan
www.anselan.com 2001
P1294321
(1+2)
Black to move. Last move?
R: 1. Kb8xSa8
play all play one stop play next play all
Compare P0001033.
Gerald Ettl: steht der sLh5 vielleicht auf h2 ?? (2023-07-02)
SCHRECKE: Why not R: Kb8xLa8? (2023-07-03)
Mario Richter: Wie "SCHRECKE" mit seiner Frage schon illustriert hat: mit dem sL auf h2 wäre das Problem inkorrekt, da neben R: 1. Kb8xSa8 auch R: 1. Kb8xLa8 als letzter Zug möglich gewesen wäre. Grund sind die etwas verwirrenden Dead-Reckoning-Regeln: mit sLh5 kann zuletzt nicht Kb8xLa8 geschehen sein, da in der Stellung wKb8 - sKb6 sLh5 sLa8 wegen der unzureichendes-Material-zum-Mattsetzen-Regel das Spiel schon in dieser Position beendet gewesen wäre, der wK als gar nicht mehr zur Ausführung eines Zuges geommen wäre ... (2023-07-03)
Mario Richter: Dear James, I suggest that you undo last change and put the black bishop back on h5! (2023-07-03)
A.Buchanan: There are 17 valid squares for the wB. Got to be on a light square for reasons given. Also it can't occupy or attack c8. And can't be attacking a8 because BTM. I think h5 selection was random, but could argue for any. (2023-07-04)
A.Buchanan: Or maybe bBa4, with which White by his last move avoided a completely sound #12. (2023-07-04)
Gerald Ettl: Dann waere es vielleicht ganz sinnvoll man schreibt die Bedingung unter das Diagramm. (2023-07-04)
A.Buchanan: Hi Gerald, it's not a condition, it's a FIDE rule since 1997, invented by a problemist who is also a rules committee member (Igor Vereschchagin) and approved by the rules committee (headed by FIDE Head International Arbiter Stewart Reuben), backed up by a WFCC convention since 2015 (Kjell Widlert & Michel Caillaud, responding to a request from some endgame studiers who understood that it was a real thing. Like 50M rule, it applies by default for retro problems. And the PDB keywords here give the game away anyway. If it was a forward stipulation, then I would indeed add a stipulation, e.g. P1208623. Please enjoy the madness that is DP rule :) P.S. I have found recently that it was really invented by Shakespeare. (2023-07-04)
Gerald Ettl: Ich spiele nicht nach den FIDE-Regel. (2023-07-04)
Olaf Jenkner: Allright.
https://www.skat-online.com/regeln-hilfe/regelwerk/internationale-skatordnung.html (2023-07-05)
comment
Keywords: Type B, Last Move? (KxS), Dead Position, Economy record (Last Move? Type B), Rex solus (W), Aristocrat, Miniature, Minimal
Genre: Retro
FEN: K7/8/1k6/7b/8/8/8/8
Reprints: Retros mailing list 20/02/2007
Input: A.Buchanan, 2015-01-07
Last update: James Malcom, 2023-07-03 more...
13 - P1339695
Kostas Prentos
09 Belgrade Sake Tourney 2016
2. ehrende Erwähnung
P1339695
(6+0)
h#2
2 Lösungen
Colorless chess
Kostas Prentos: Solution:
1. Le7(=b) Kh5(=w, bKa4, wTb5, wLe8) 2. La3 Sb6(=w)#
1. Lg3(=b) Se3(=w) 2. Kh4(=b, wKa4) Th5(=w, wLe8)# (2022-12-08)
comment
Keywords: Colorless chess, Aristocrat
Genre: h#, Retro, Fairies
FEN: 4B3/8/8/1R6/K1N3KB/8/8/8
Reprints: 09 Problem Paradise 74, p. 47, 04-06/2016
Input: A.Buchanan, 2017-09-18
Last update: Alfred Pfeiffer, 2017-09-19 more...
14 - P1389595
Otto Trinks

P1389595
(2+1) cooked
-1w,1s, dann h#1
R: 1. Bc7xTb8=L Tb7-b8, dann 1. Ta7 c8=D#
play all play one stop play next play all
Der letzte Zug von Weiß muß: Bc7xTb8 und wird Läufer gewesen sein. Schwarz hat vorher Tb7-b8+ gezogen. Nach Rücknahme des letzten Zuges von Weiß und des letzten Zuges von Schwarz ergibt sich daher die Stellung : Weiß: Kh8 Bc7; Schwarz: Ka8, Tb7. Schwarz zieht daher jetzt, um das Matt in einem Zug zu ermöglichen: Tb7-a7 worauf Weiß mit c7-c8=D matt setzt.
Cook: Co-NLs
R: 1. Ba7xLb8=L Kb7xTa8, dann 1. Ka6 axb8=D,axb8=T
R: 1. Ba7xSb8=L Kb7xTa8, dann 1. Ka6 axb8=D,axb8=T
Forderung im 'Boten von der Ybbs': "Weiß nimmt seinen letzten Zug zurück, dann nimmt Schwarz seinen letzten Zug zurück und dann zieht Schwarz so, daß Weiß in einem Zug matt-setzen kann!"

Motto: "Das Waidhofner Problem"

als Autor ist angegeben "Dr. S. Knirt", dabei dürfte es sich um ein Pseudonym von Dr. Otto Trinks handeln (S.Knirt rückwärts gelesen ergibt trinKS)
Adrian Storisteanu: See P0002517. (2024-03-19)
comment
Keywords: Help retractor, Aristocrat, Minimal, Miniature, under-promotion (L), Promotion in the mating move
Genre: Retro
FEN: kB5K/8/8/8/8/8/8/8
Reprints: 13 Bote von der Ybbs 28/12/1929
Input: Mario Richter, 2021-05-14
Last update: Alfred Pfeiffer, 2021-08-16 more...
15 - P1401711
Andrew Buchanan
OP008 The Hopper Magazine I01 24/12/2021
"Ak ja, retten, retten; hvad hjælper det, at du har retten, når du ikke har nogen magt?"
P1401711
(3+3) C+
h#2.5 (2 solutions)
Position after Black's 5,696th move
1. ... Se6 2. Th2 Ta8 3. Th7 Txe8#
1. ... Txa2 2. Lg6 Tg2 3. Lh7 Sf7#
not 1. ... 0-0-0 2. Lg6 Tg1 3. Lh7 Sf7#?? (game just ended by 50M)
play all play one stop play next play all
A full solution is really too big for PDB, but it is available at https://www.thehoppermagazine.com/AA084
Henrik Juel: solutions
1...Sg5-e6 2.Ra2-h2 Ra1-a8 3.Rh2-h7 Ra8*e8 #
1...Ra1*a2 2.Be8-g6 Ra2-g2 3.Bg6-h7 Sg5-f7 #
not 1...0-0-0? 2.Be8-g6 Rd1-g1 3.Bg6-h7 Sg5-f7 #
because White has lost his right to castle, as Andrew will explain, I hope... (2023-07-29)
A.Buchanan: White has not necessarily lost the right to castle, but if he can castle then the 50M rule triggers before the mate can be executed. It is pretty complicated, sorry. (2023-07-29)
A.Buchanan: We don't do mottoes much these days. Mrs Baird was a big fan. On page 301 of the July 1916 Chess Amateur P.H. Williams wrote:
"I think it was Mrs Baird who did more to search Shakespeare for accidental (or deliberate) reference to chess, since all her retractors had Shakespearean mottoes, and her knowledge of the Avonian bard was obviously extensive. Her example was followed by other composers of retractors, who considered such positions would be incomplete without some reference to the poet."
But there are other great playwrights, and Asteroid 5696 was named after one such, whose bitter quotation accurately states this problem's theme. (2023-07-31)
Henrik Juel: The citation is by danish philosopher Søren Kierkegaard (1813-1855) and means something like
Oh yes, to be right, to be right; it does not help much that you are right, when you have no power. (2023-07-31)
Henrik Juel: Asteroid 5696 is named Ibsen after the norwegian playwright Henrik Ibsen (1828-1906), who must have borrowed the citation from Søren Kierkegaard (2023-07-31)
A.Buchanan: Thanks for this Henrik - I resolved the question here: https://philosophy.stackexchange.com/questions/101229/did-ibsen-originate-this-statement
Beyond the castling try, the other innovation here is in the solution beginning 1...Se6. Castling convention and 50M I think are trying to combine by Retro Strategy (being optimistic about 50M rights like we are with castling, rather than pessimistic like we are with ep). (2023-08-04)
more ...
comment
Keywords: Aristocrat, Miniature, 50 move rule, Castling, Exchange of roles (T/S, Guard/Mate), Chumakov theme (l/t, simplified), Retro Strategy (RS), Model mate (2), Constrained problem
Genre: h#, Retro
Computer test: HC+ Popeye 4.61 and analysis
FEN: 4b2k/8/8/6N1/8/8/r7/R3K3
Reprints: AA084 The Hopper Magazine I04 13/07/2023
Input: A.Buchanan, 2022-06-09
Last update: A.Buchanan, 2023-08-27 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (9)
Frank Müller (1)
Felber, Volker (1)
A.Buchanan (3)
Mario Richter (1)