40 problem(s) found in 5514 milliseconds (displaying 40 problem(s)). [COMMENTDATE>=20220810 AND G='Retro' AND NOT K='Platzwechsel' AND K='Miniatur'] [download as LaTeX]
R: 1. b2xBc3 b4xc3ep, dann bxa6 b3=
Cook: R: 1. b2xDc3 Da3xSc3, dann 1. bxa6 bxa3=
Cook: R: 1. b2xDc3 Da3xSc3, dann 1. bxa6 bxa3=
Keywords: En passant in the retro play, Help retractor, Kindergarten Problem, Minimal, Miniature, Ideal stalemate, Superseded by (P1360139)
Genre: Retro, Fairies
Computer test: cooked by Deadpos v2.3 14-Jan-2024
FEN: 8/1pK5/P7/k7/8/2P5/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-18 more...
Genre: Retro, Fairies
Computer test: cooked by Deadpos v2.3 14-Jan-2024
FEN: 8/1pK5/P7/k7/8/2P5/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-18 more...
1. Da1! droht (unparierbar) 2. Dh8#
1. ... 0-0-0? ist illegal, da sK oder sTa8 schon gezogen haben muss
1. ... 0-0-0? ist illegal, da sK oder sTa8 schon gezogen haben muss
Keywords: Cant Castler, Castling (sg), Minimal, Miniature, Homebase
Genre: Retro, 2#
Computer test: C+ Popeye 4.61
FEN: r3k3/p1p5/Q3K3/8/8/8/8/8
Reprints: 304 Chess Strategy (Loyd) 1878
73 150 Schachkuriositäten 1910
63 Sam Loyd and his Chess Problems 1913
43 64 Schach-Scherze 1915
32 Retrograde Analysis 1915
168 Allgemeine Zeitung Chemnitz 27/11/1927
Arbeiter-Zeitung (Wien) 27/11/1932
8 Comoedia 09/07/1933
(II) Problem 37-40 09/1956
(D10) feenschach 27 04/1975
84 100 Classics of the Chessboard 1983
(7a) Die Schwalbe 145 08/1995
Thema Danicum 95 1999
52 Opfer-Opfer-Matt Gaudium 21 10/2000
Outrageous Chess Problems 2005
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2023-05-26 more...
Genre: Retro, 2#
Computer test: C+ Popeye 4.61
FEN: r3k3/p1p5/Q3K3/8/8/8/8/8
Reprints: 304 Chess Strategy (Loyd) 1878
73 150 Schachkuriositäten 1910
63 Sam Loyd and his Chess Problems 1913
43 64 Schach-Scherze 1915
32 Retrograde Analysis 1915
168 Allgemeine Zeitung Chemnitz 27/11/1927
Arbeiter-Zeitung (Wien) 27/11/1932
8 Comoedia 09/07/1933
(II) Problem 37-40 09/1956
(D10) feenschach 27 04/1975
84 100 Classics of the Chessboard 1983
(7a) Die Schwalbe 145 08/1995
Thema Danicum 95 1999
52 Opfer-Opfer-Matt Gaudium 21 10/2000
Outrageous Chess Problems 2005
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2023-05-26 more...
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=
R: 1. Kf1-g1 Kg3xDf3, dann 1. Kh2 Kf2=
"set play" ( -s, dann h=1 )
R: 1. Ke2xDf3, dann 1. Ke1 Dd3=
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)
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- 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...
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...
1. Kb3 Kd2 2. Ka4 Kc3 3. a2 Txa2#
Nicht 1. Kb3 0-0-0?? 2. Ka2 Td3 3. Ka1 Txa3#, da Weiß zuletzt mit K oder T gezogen hat
Nicht 1. Kb3 0-0-0?? 2. Ka2 Td3 3. Ka1 Txa3#, da Weiß zuletzt mit K oder T gezogen hat
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#
1. ... Sg8! 2. Td8 Sc7#
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)
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I have changed the solution accordingly. (2023-03-10)
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R: 1. Ke2xLf1 ~ 2. Kd3xLe2 ~ 3. Kc4xLd3 ~ 4. Kb5xLc4 ~ 5. Kb6-b5! ~ 6. Sa6xSb8, dann 1. Sc7#
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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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...
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...
R: 1. Ka3-a4?, dann 1. Lxa2=
R: 1. Ka3xBa4!, dann 1. Lxa2=
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
R: 1. Ka3xBa4!, dann 1. Lxa2=
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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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...
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...
1) R: 1. Kc5xDd6 Dd7xDd6, dann 1. Dc6 Dxc6=
2) R: 1. Kc5xBd6 c7xDd6, dann 1. c6 Dxc6#
2) R: 1. Kc5xBd6 c7xDd6, dann 1. c6 Dxc6#
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)
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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)
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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...
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...
R: 1. a7-a8=D+ h2-h1=S, dann 1. h1=L a8=T=
Cook: NL
R: 1. Da4-a8+ Sf2xLh1, dann 1. Kxb6 Lxg2=
R: 1. Da4-a8+ Sf2xTh1, dann 1. Kxb6 Th7=
Cook: NL
R: 1. Da4-a8+ Sf2xLh1, dann 1. Kxb6 Lxg2=
R: 1. Da4-a8+ Sf2xTh1, dann 1. Kxb6 Th7=
Adrian Storisteanu: Two wPs (e.g. +wPe4,+wPh4) can restore the glory to this nice, thoroughly mixed AUW... (2015-06-10)
A.Buchanan: Or instead +wPa5 or +wPc5. In either case, free to "downgrade" wBg1 to wS. This is more economical than adding two pawns, but separates the two islands conceptually, as b6 no longer needs to be controlled by wBg1. (2024-01-15)
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A.Buchanan: Or instead +wPa5 or +wPc5. In either case, free to "downgrade" wBg1 to wS. This is more economical than adding two pawns, but separates the two islands conceptually, as b6 no longer needs to be controlled by wBg1. (2024-01-15)
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Keywords: Allumwandlung (Ds:lT), Help retractor, Miniature, Type C
Genre: Retro, Fairies
Computer test: C- for original & C+ for Adrian's & Andrew's proposed fixes. Deadpos v2.3 14-Jan-2024
FEN: Q7/1k6/1N1K4/8/8/8/6p1/6Bn
Input: Gerd Wilts, 1996-07-28
Last update: A.Buchanan, 2024-01-21 more...
Genre: Retro, Fairies
Computer test: C- for original & C+ for Adrian's & Andrew's proposed fixes. Deadpos v2.3 14-Jan-2024
FEN: Q7/1k6/1N1K4/8/8/8/6p1/6Bn
Input: Gerd Wilts, 1996-07-28
Last update: A.Buchanan, 2024-01-21 more...
R: 1. c7-c8=T h2-h1=D, dann 1. h1=L cxd8=S=
Cook: NL
R: 1. Tb8-c8 Dh6xDh1, dann 1. Sd8-e6 Dh1xh6=
Cook: NL
R: 1. Tb8-c8 Dh6xDh1, dann 1. Sd8-e6 Dh1xh6=
Adrian Storisteanu: Possible fix: +wPh5 (4+4). (2015-08-05)
A.Buchanan: A cool fix which keeps miniature status is -bSd8 + bRd8 (2024-01-15)
A.Buchanan: Alas my suggestion is anticipated by P1202424, ah well. (2024-01-16)
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A.Buchanan: A cool fix which keeps miniature status is -bSd8 + bRd8 (2024-01-15)
A.Buchanan: Alas my suggestion is anticipated by P1202424, ah well. (2024-01-16)
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Keywords: Allumwandlung (Td:lS), Help retractor, Miniature, Superseded by (P1202424)
Genre: Retro, Fairies
Computer test: C- for original & C+ for Adrian & Andrew's fixes. Deadpos v2.3 14-Jan-2024
FEN: 2Rn4/8/k7/8/K7/8/6p1/6Bq
Reprints: Problemkiste (32) 10/1985
Input: Gerd Wilts, 1996-07-28
Last update: A.Buchanan, 2024-01-18 more...
Genre: Retro, Fairies
Computer test: C- for original & C+ for Adrian & Andrew's fixes. Deadpos v2.3 14-Jan-2024
FEN: 2Rn4/8/k7/8/K7/8/6p1/6Bq
Reprints: Problemkiste (32) 10/1985
Input: Gerd Wilts, 1996-07-28
Last update: A.Buchanan, 2024-01-18 more...
11 - P0007026
Josef Haas
1411 feenschach 25 10/1974
1. ehrende Erwähnung
(5+1)
Ergänze 4wBB und 4sBB zu einem IC!
Josef Haas
1411 feenschach 25 10/1974
1. ehrende Erwähnung
(5+1)
Ergänze 4wBB und 4sBB zu einem IC!
a) 1.
Im IC verhindern die sBB, daß der wLd4 ein UW-L sein kann, die Konfiguration der weißen Steine, daß er der original-Lc1 sein kann.
Im IC verhindern die sBB, daß der wLd4 ein UW-L sein kann, die Konfiguration der weißen Steine, daß er der original-Lc1 sein kann.
Keywords: Illegal cluster, Miniature
Genre: Retro
FEN: 8/8/8/3k4/3B4/3P4/3K4/2NB4
Reprints: feenschach 28 05-07/1975
Input: Gerd Wilts, 1996-08-11
Last update: Mario Richter, 2022-09-19 more...
Genre: Retro
FEN: 8/8/8/3k4/3B4/3P4/3K4/2NB4
Reprints: feenschach 28 05-07/1975
Input: Gerd Wilts, 1996-08-11
Last update: Mario Richter, 2022-09-19 more...
12 - P0007185
Jesse George Ingram
10231 The Fairy Chess Review 06/1955
(2+2)
-1w, dann h=1 half-duplex
Jesse George Ingram
10231 The Fairy Chess Review 06/1955
(2+2)
-1w, dann h=1 half-duplex
R: 1. a5xDb6, dann 1. a6 Dd6=
Olaf Jenkner: Wieso wird Weiß pattgesetzt? (2010-03-02)
Mario Richter: Weil der Komponist das so wollte :-)
In fs33 ist die Forderung wie folgt wiedergegeben: "Wei� nimmt einen Zug zurück und hilft, da� Schwarz sofort pattsetzen kann." (2010-03-03)
Olaf Jenkner: Ach so, h=1 bedeutet eigentlich, daß Schwarz beginnt. (2010-03-03)
Henrik Juel: Yes, it is a bit confusing; but for retros it is an old tradition that you should not interpret one move stipulations too rigorously. (2010-03-05)
Mario Richter: But at least retro play and forward play harmonize: the side that retracted last starts the forward play. (2010-03-05)
Adrian Storisteanu: Can easily make it conform to today's accepted standards (i.e., drop the half-duplex indication):
Ka1 pa2 / Kc1 pb3 (2+2)
-1b & h=1
- 1.a4xQb3 & 1.a4-a3 Qb3-d3= (2024-01-13)
Olaf Jenkner: Das wären dann viele Mütter. (2024-01-14)
A.Buchanan: @Olaf :-) (2024-01-15)
Adrian Storisteanu: :-) Just in reverse Polish notation...
(Didn't know the many fathers thing started that long ago. I totally missed both the obvious setting and the recorded keyword.) (2024-01-15)
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Mario Richter: Weil der Komponist das so wollte :-)
In fs33 ist die Forderung wie folgt wiedergegeben: "Wei� nimmt einen Zug zurück und hilft, da� Schwarz sofort pattsetzen kann." (2010-03-03)
Olaf Jenkner: Ach so, h=1 bedeutet eigentlich, daß Schwarz beginnt. (2010-03-03)
Henrik Juel: Yes, it is a bit confusing; but for retros it is an old tradition that you should not interpret one move stipulations too rigorously. (2010-03-05)
Mario Richter: But at least retro play and forward play harmonize: the side that retracted last starts the forward play. (2010-03-05)
Adrian Storisteanu: Can easily make it conform to today's accepted standards (i.e., drop the half-duplex indication):
Ka1 pa2 / Kc1 pb3 (2+2)
-1b & h=1
- 1.a4xQb3 & 1.a4-a3 Qb3-d3= (2024-01-13)
Olaf Jenkner: Das wären dann viele Mütter. (2024-01-14)
A.Buchanan: @Olaf :-) (2024-01-15)
Adrian Storisteanu: :-) Just in reverse Polish notation...
(Didn't know the many fathers thing started that long ago. I totally missed both the obvious setting and the recorded keyword.) (2024-01-15)
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Keywords: Help retractor, Vielväterstellung, Kindergarten Problem, Minimal, Miniature
Genre: Retro, Fairies
FEN: k1K5/p7/1P6/8/8/8/8/8
Reprints: (5) feenschach 33 04-05/1976
Input: Gerd Wilts, 1996-08-15
Last update: A.Buchanan, 2024-01-18 more...
Genre: Retro, Fairies
FEN: k1K5/p7/1P6/8/8/8/8/8
Reprints: (5) feenschach 33 04-05/1976
Input: Gerd Wilts, 1996-08-15
Last update: A.Buchanan, 2024-01-18 more...
R: 1. Kg1xSh2#
Keywords: Last Move? (KxS), Checkless, Miniature
Genre: Retro, Fairies
FEN: 8/8/8/8/8/7P/2Q3PK/4k2R
Input: Gerd Wilts, 1996-08-18
Last update: A.Buchanan, 2023-05-15 more...
Genre: Retro, Fairies
FEN: 8/8/8/8/8/7P/2Q3PK/4k2R
Input: Gerd Wilts, 1996-08-18
Last update: A.Buchanan, 2023-05-15 more...
BTM 1. ... axb6+ 2. Ta5! 0-0-0 3. Ta8#
2. Ta7? 0-0-0! & no mate in 1
WTM 1. Lc5! (0-0-0??) droht 2. Tf8#
2. Ta7? 0-0-0! & no mate in 1
WTM 1. Lc5! (0-0-0??) droht 2. Tf8#
VL: Published in "Probl. Pribuzh." (or "Problemy Pribusch'ja"?),
1990, No.1, #12. An obscure Russian language chess problem
magazine issued in Nikolaev, the Ukraine (the South Bug
riverside region). (2006-01-27)
A.Buchanan: Lovely problem, but this is no more PRA than it is duplex. Rather, the push/pull of AP Type Keym gives a forfeit which must be discharged. (2023-07-22)
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1990, No.1, #12. An obscure Russian language chess problem
magazine issued in Nikolaev, the Ukraine (the South Bug
riverside region). (2006-01-27)
A.Buchanan: Lovely problem, but this is no more PRA than it is duplex. Rather, the push/pull of AP Type Keym gives a forfeit which must be discharged. (2023-07-22)
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Keywords: a posteriori (AP) (Type Keym), Castling, Homebase (s), Miniature
Genre: Retro, 2#
FEN: r3k3/p6R/1B6/5R2/8/8/8/K7
Input: Gerd Wilts, 1996-12-14
Last update: A.Buchanan, 2022-02-15 more...
Genre: Retro, 2#
FEN: r3k3/p6R/1B6/5R2/8/8/8/K7
Input: Gerd Wilts, 1996-12-14
Last update: A.Buchanan, 2022-02-15 more...
15 - P0008784
Niels Høeg
The Chess Amateur 07/1926
(1+1)
Längste BP ohne Schach. Welches war der letzte Zug?
Niels Høeg
The Chess Amateur 07/1926
(1+1)
Längste BP ohne Schach. Welches war der letzte Zug?
R: 5899. Kg2xTh1
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
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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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...
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...
1. ... Lxd3 2. La6/Lb5/Ld5/Le6/Lf7/Lg8 Kb1 3. a2+ Kc1 4. a1=L Lxa6/Lxa5/Le4/Lf5/Lg6/Lh7 5. Ka2 Lc4#/Lc4#/Lxd5#/Lxe6#/Lxf7#/Lxg8#
Es war zum Abschlus noch ein ganz besonderer Gag - "zum wiederholten Male stellt der Autor die Löser mit einem Retro-trick auf die Probe".
"denn eine rückshauende Betrachung der Stellung ergibt daß Weiß nicht zuletzt gezogen haben kann, mithin also am Zuge ist."
"aber da gibt es wohl jede Menge Variationsmöglichkeiten bei den Läuferzugen.
In diesem speziellen Fall blieben sie unbewertet, zumal es ja auch eine spezielle Spielart, das sog. "Varianten Hilfsmatt" geben soll."
"Fazit: eine gute Mischung!"
"Durch die Hilsmatt-chwemme war es eine recht einfache, aber nicht uninteressante Angelenheir, vor allem die Nr. 13412 und natürlich der Retro-Witz haben mir gefallen."
Dennoch "Ein kleines Selbstmatt dazwischen (so in neun Zügen oder mehr) ware schon gang recht gewesen."
Some retro tries h#6 but not distinct.
Cook: The 6 helpmate variants seem to be intended.
Es war zum Abschlus noch ein ganz besonderer Gag - "zum wiederholten Male stellt der Autor die Löser mit einem Retro-trick auf die Probe".
"denn eine rückshauende Betrachung der Stellung ergibt daß Weiß nicht zuletzt gezogen haben kann, mithin also am Zuge ist."
"aber da gibt es wohl jede Menge Variationsmöglichkeiten bei den Läuferzugen.
In diesem speziellen Fall blieben sie unbewertet, zumal es ja auch eine spezielle Spielart, das sog. "Varianten Hilfsmatt" geben soll."
"Fazit: eine gute Mischung!"
"Durch die Hilsmatt-chwemme war es eine recht einfache, aber nicht uninteressante Angelenheir, vor allem die Nr. 13412 und natürlich der Retro-Witz haben mir gefallen."
Dennoch "Ein kleines Selbstmatt dazwischen (so in neun Zügen oder mehr) ware schon gang recht gewesen."
Some retro tries h#6 but not distinct.
Cook: The 6 helpmate variants seem to be intended.
Keywords: No legal last move for White, Miniature
Genre: h#, Retro
Computer test: C+ Helpmate Analyzer 6 variant solutions
FEN: 8/8/8/8/2b5/pk1p4/1P6/KB6
Input: Felber, Volker, 1999-12-27
Last update: A.Buchanan, 2023-12-07 more...
Genre: h#, Retro
Computer test: C+ Helpmate Analyzer 6 variant solutions
FEN: 8/8/8/8/2b5/pk1p4/1P6/KB6
Input: Felber, Volker, 1999-12-27
Last update: A.Buchanan, 2023-12-07 more...
1) 1. Tb2 0-0-0 2. Tb4 Th3#
2) 1. Kd3 Ta4 2. c3 Th3#
3) 1. Kb2 0-0 2. c3 Tfb1#
2) 1. Kd3 Ta4 2. c3 Th3#
3) 1. Kb2 0-0 2. c3 Tfb1#
VL: One solution consists of two partial ones, and there is another, castling independent, solution. A rare scenario; cf. P1091926. Presently, due to Art.16 (3) of the Codex, the mark "RV" may be deleted from the stipulation. (2017-11-25)
A.Buchanan: Methodologically, I think that one applies PRA first. So there are two parts, and each has two solutions. One solution is shared across both parts (2023-08-22)
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A.Buchanan: Methodologically, I think that one applies PRA first. So there are two parts, and each has two solutions. One solution is shared across both parts (2023-08-22)
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Keywords: Castling (wk,wg), Partial Retro Analysis (PRA), Miniature, Homebase (w)
Genre: h#, Retro
Computer test: Popeye WIN32-Version 3.56 (2048 KB)
FEN: 8/8/8/8/2p5/2k5/2r5/R3K2R
Input: Michal Dragoun, 2001-09-20
Last update: A.Buchanan, 2023-08-22 more...
Genre: h#, Retro
Computer test: Popeye WIN32-Version 3.56 (2048 KB)
FEN: 8/8/8/8/2p5/2k5/2r5/R3K2R
Input: Michal Dragoun, 2001-09-20
Last update: A.Buchanan, 2023-08-22 more...
18 - P1068215
Zdravko Maslar
4936 feenschach 12/1986
2. Preis WJP
(1+2)
-1s, dann h=1
b) Kc1 nach b2
c) Kc1 nach a3
d) Kc1 nach a4
Zdravko Maslar
4936 feenschach 12/1986
2. Preis WJP
(1+2)
-1s, dann h=1
b) Kc1 nach b2
c) Kc1 nach a3
d) Kc1 nach a4
a) R: 1. Kb2xDc1, dann 1. Kb3 Da1=
b) R: 1. Ka1xTb2, dann 1. b3 Kc3=
c) R: 1. a5xSb4, dann 1. a4 Kc3=
d) R: 1. c5xLb4, dann 1. c4+ Kxc4=
b) R: 1. Ka1xTb2, dann 1. b3 Kc3=
c) R: 1. a5xSb4, dann 1. a4 Kc3=
d) R: 1. c5xLb4, dann 1. c4+ Kxc4=
Henrik Juel: a real gem (2023-05-20)
Adrian Storisteanu: Not an Allentschlag, there is no pawn uncapture. (2023-05-21)
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Adrian Storisteanu: Not an Allentschlag, there is no pawn uncapture. (2023-05-21)
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Keywords: Help retractor, RIFACE Retro Solving Tourney (2022), Kindergarten Problem, Minimal, Miniature, Kindergarten Problem, Miniature, Kindergarten Problem, Kindergarten Problem
Genre: Retro, Fairies
FEN: 8/8/8/8/1p6/3K4/8/2k5
Reprints: feenschach 158 01-03/2005
3 Phénix 331, p. 12922, 06/2022
Input: Gerd Wilts, 2006-01-21
Last update: A.Buchanan, 2024-01-18 more...
Genre: Retro, Fairies
FEN: 8/8/8/8/1p6/3K4/8/2k5
Reprints: feenschach 158 01-03/2005
3 Phénix 331, p. 12922, 06/2022
Input: Gerd Wilts, 2006-01-21
Last update: A.Buchanan, 2024-01-18 more...
19 - P1112386
Mrs. W. J. Baird
(2) British Chess Magazine , p. 136, 03/1903
(1+1) C+
Hilfsrückzüger
siehe Text
Mrs. W. J. Baird
(2) British Chess Magazine , p. 136, 03/1903
(1+1) C+
Hilfsrückzüger
siehe Text
R: 1. Kf6xBg6, dann 1. ... Kh8 Kf7, dann R: sBh7xBg6, dann 2. ... g7#
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.
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)
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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)
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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...
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...
a) 1. Tgg7 Kf8 2. Lb4+ Ke8 3. Tc8#
b) 1. Tb3 Th3 2. Txh3 Kd8,Kf8 3. Th8#
b) 1. Tb3 Th3 2. Txh3 Kd8,Kf8 3. Th8#
1. ... Kxa1! 2. c4 Ka2 3. Sc3+ Ka1 4. Lb2#
Retro try:
1. c4? Kxa1 2. Lb2+ Ka2 3. Sc3#
Retro try:
1. c4? Kxa1 2. Lb2+ Ka2 3. Sc3#
RA3
A.Buchanan: I guess for these kinds of problems it's always worth looking if there is a retro try. Here there is - an added bonus (2023-12-04)
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A.Buchanan: I guess for these kinds of problems it's always worth looking if there is a retro try. Here there is - an added bonus (2023-12-04)
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Keywords: Miniature Collection (0341852), Miniature, No legal last move for Black
Genre: 3#, Retro
Computer test: C+ Popeye 4.61 and analysis
FEN: 8/8/8/8/8/1PP5/k1K5/NNB5
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2023-12-04 more...
Genre: 3#, Retro
Computer test: C+ Popeye 4.61 and analysis
FEN: 8/8/8/8/8/1PP5/k1K5/NNB5
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2023-12-04 more...
R: 1. b7-b8=S, dann 1. Ld8 Ka6 2. b8=S#
R: 1. b7-b8=S, dann 1. Ld8 Kb8 2. Sc6#
Cook: R: 1. Sa6-b8, dann 1. Lc5+! Kxa6 2. Ta7#
R: 1. Sa6-b8, dann 1. Lc5+! Ka8 2. Ta7#
R: 1. b7-b8=S, dann 1. Ld8 Kb8 2. Sc6#
Cook: R: 1. Sa6-b8, dann 1. Lc5+! Kxa6 2. Ta7#
R: 1. Sa6-b8, dann 1. Lc5+! Ka8 2. Ta7#
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...
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...
a) 1. d8=T Ka5 2. Td6 Ka4 3. Ta6#;
b) kein letzter Zug für Schwarz, also
1. ... Kxa5 2. d8=D+ Ka6 3. Db8 Ka5 4. Db5,Da7#
b) kein letzter Zug für Schwarz, also
1. ... Kxa5 2. d8=D+ Ka6 3. Db8 Ka5 4. Db5,Da7#
RA3 BUT32 RA
b) Werner Speckmann, 04.1973, DSZ, S.134, B;
vf: klären Spiegelung in DSZ
SCHRECKE: b) kein letzter Zug für Schwarz, also: 0. ... Kxa5 1. d8D+ Ka6 2. Db8 Ka5 3. Db5,Da7# (2022-08-11)
Henrik Juel: C+ Popeye 4.61, except for the mate dual in b) (2022-08-12)
comment
b) Werner Speckmann, 04.1973, DSZ, S.134, B;
vf: klären Spiegelung in DSZ
SCHRECKE: b) kein letzter Zug für Schwarz, also: 0. ... Kxa5 1. d8D+ Ka6 2. Db8 Ka5 3. Db5,Da7# (2022-08-11)
Henrik Juel: C+ Popeye 4.61, except for the mate dual in b) (2022-08-12)
comment
Keywords: Miniature Collection (0046916), No legal last move for Black, Kindergarten Problem, Miniature, Kindergarten Problem
Genre: 3#, Retro
FEN: 8/3P4/8/8/k1K5/8/1P6/8
Input: Felber, Volker, 2010-09-11
Last update: Mario Richter, 2022-08-12 more...
Genre: 3#, Retro
FEN: 8/3P4/8/8/k1K5/8/1P6/8
Input: Felber, Volker, 2010-09-11
Last update: Mario Richter, 2022-08-12 more...
1. ... Kxa7 2. Kc7 Ka8 3. b5 Ka7 4. b6 Ka8 5. b7 Ka7 6. Sc6+ Ka6 7. b8=S#
1. ... Kxb8 2. Kb6 Ka8 3. c4 Kb8 4. c5 Ka8 5. c6 Kb8 6. c7+ Ka8 7. c8=D/T#
1. ... Kxb8 2. Kb6 Ka8 3. c4 Kb8 4. c5 Ka8 5. c6 Kb8 6. c7+ Ka8 7. c8=D/T#
Keywords: Miniature Collection (0340365), No legal last move for Black, Excelsior (S,D/T), Miniature
Genre: n#, Retro
Computer test: A. Baumann: Gustav 4.2a
FEN: kN6/N7/2K5/8/PP6/8/2P5/8
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2024-04-05 more...
Genre: n#, Retro
Computer test: A. Baumann: Gustav 4.2a
FEN: kN6/N7/2K5/8/PP6/8/2P5/8
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2024-04-05 more...
1... b6
Cook: 1. ... b5 2. Ta1/Ta1/Ta6/Ta5/Kd7/Kd8
1. ... b6 2. b4/Kd7/Kd8
Cook: 1. ... b5 2. Ta1/Ta1/Ta6/Ta5/Kd7/Kd8
1. ... b6 2. b4/Kd7/Kd8
A18d RA3
Henrik Juel: duals, e.g., 0... b5 1.Kd8,Kd7,Ta1 (2022-12-05)
A.Buchanan: If WTM, no solution, but since no legal last move for Black, we let Black start:
1...b5
2.Ra1/Ra2/Ra6 b4
3.Kd7/Kd8 Kb7 4.a8=Q#
2.Ra5 b4
3.Rc5 Kxa7 4.Ra5#
3.Kd7/Kd8 Kb7 4.a8=Q#
2.Kd7/Kd8 b4
3.Ra1/Ra2/Ra6/Ra5/Ra4 Kb7 4.a8=Q#
1...b6
2.b4 b5
3.Re3 Kxa7 4.Ra3#
3.Kd7/Kd8 Kb7 4.a8=Q#
2.Kd7/Kd8 b5 3.b4 Kb7 4.a8=Q#
The play is so savagely dualized, that one must marked it as cooked. Typo? (2023-12-04)
comment
Henrik Juel: duals, e.g., 0... b5 1.Kd8,Kd7,Ta1 (2022-12-05)
A.Buchanan: If WTM, no solution, but since no legal last move for Black, we let Black start:
1...b5
2.Ra1/Ra2/Ra6 b4
3.Kd7/Kd8 Kb7 4.a8=Q#
2.Ra5 b4
3.Rc5 Kxa7 4.Ra5#
3.Kd7/Kd8 Kb7 4.a8=Q#
2.Kd7/Kd8 b4
3.Ra1/Ra2/Ra6/Ra5/Ra4 Kb7 4.a8=Q#
1...b6
2.b4 b5
3.Re3 Kxa7 4.Ra3#
3.Kd7/Kd8 Kb7 4.a8=Q#
2.Kd7/Kd8 b5 3.b4 Kb7 4.a8=Q#
The play is so savagely dualized, that one must marked it as cooked. Typo? (2023-12-04)
comment
Keywords: Miniature Collection (0334424), No legal last move for Black, Minimal, Miniature
Genre: 3#, Retro
Computer test: HC- Popeye v4.87 & trivial retro argument
FEN: k1K5/Pp6/8/8/8/RP6/5B2/8
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2023-12-04 more...
Genre: 3#, Retro
Computer test: HC- Popeye v4.87 & trivial retro argument
FEN: k1K5/Pp6/8/8/8/RP6/5B2/8
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2023-12-04 more...
1. ... Kxa6 2. Ta8+ Kb7 3. Lc6#
1. ... Kxc8 2. Ta8+ Kb7 3. Lc6#
1. Lc6+? Kxa6,Kxc8 2. Ta8#
1. ... Kxc8 2. Ta8+ Kb7 3. Lc6#
1. Lc6+? Kxa6,Kxc8 2. Ta8#
Keywords: Miniature Collection (0315439), No legal last move for Black, Miniature
Genre: 2#, Retro
Computer test: C+ Popeye 4.61 and human reasoning
FEN: 2R5/1kB5/RP6/3K4/B7/8/8/8
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2023-06-29 more...
Genre: 2#, Retro
Computer test: C+ Popeye 4.61 and human reasoning
FEN: 2R5/1kB5/RP6/3K4/B7/8/8/8
Input: Zuncke/Bruder, 2010-09-11
Last update: A.Buchanan, 2023-06-29 more...
a) 1. Sf4+? Kxg3 2. Th3#
1. ... Kxf3!
1. Te4? Kxf3 2. 0-0#?
1. Sg1! Kxg3 2. Tg4#
b) 1. Te4! Kf3 2. 0-0#
1. ... Kxf3!
1. Te4? Kxf3 2. 0-0#?
1. Sg1! Kxg3 2. Tg4#
b) 1. Te4! Kf3 2. 0-0#
E2-g
Zwilling in Postsjakk 01/1966, Seite 8, ohne Diagramm
Henrik Juel: C+ Popeye 4.61 and analysis
Last move was Kh3-g2 or similar, so Th1 has moved, and White may not castle (2023-04-01)
comment
Zwilling in Postsjakk 01/1966, Seite 8, ohne Diagramm
Henrik Juel: C+ Popeye 4.61 and analysis
Last move was Kh3-g2 or similar, so Th1 has moved, and White may not castle (2023-04-01)
comment
1. ... Kxd8 2. Dc4 Ke8 3. Dc8#
1. ... Kxf8 2. Dg4 Ke8 3. Dg8#
1. De5!? but Black to move
1. ... Kxf8 2. Dg4 Ke8 3. Dg8#
1. De5!? but Black to move
Keywords: Miniature Collection (0312472), No legal last move for Black, Miniature, Homebase
Genre: 2#, Retro
Computer test: C+ Popeye 4.61 after obvious analysis
FEN: 3BkN2/8/4K3/8/8/2P3P1/4Q3/8
Input: Zuncke/Bruder, 2010-09-12
Last update: A.Buchanan, 2023-08-17 more...
Genre: 2#, Retro
Computer test: C+ Popeye 4.61 after obvious analysis
FEN: 3BkN2/8/4K3/8/8/2P3P1/4Q3/8
Input: Zuncke/Bruder, 2010-09-12
Last update: A.Buchanan, 2023-08-17 more...
1. ... g5,g6 2. hxg6ep,hxg6 hxg6 3. Sxg6
2. ... h5,h6 3. g7#
2. ... h5,h6 3. g7#
Keywords: Miniature Collection (0312557), No legal last move for Black, Miniature
Genre: 2#, Retro
Computer test: C+ Popeye 4.61 and obvious analysis
FEN: 5KBk/6pp/8/7P/7N/8/8/8
Input: Zuncke/Bruder, 2010-09-12
Last update: A.Buchanan, 2023-08-17 more...
Genre: 2#, Retro
Computer test: C+ Popeye 4.61 and obvious analysis
FEN: 5KBk/6pp/8/7P/7N/8/8/8
Input: Zuncke/Bruder, 2010-09-12
Last update: A.Buchanan, 2023-08-17 more...
1. ... Kxb1 h4 Ka1 2. h5 Kb1 3. h6 Ka1 4. h7 Kb1 5. h8=T Ka1 6. Th1#
Schwarz hat keinen letzten Zug, beginnt daher.
Schwarz hat keinen letzten Zug, beginnt daher.
Keywords: Miniature Collection (0343095), Rex solus (s), No legal last move for Black, Excelsior, under-promotion (T), Miniature
Genre: n#, Retro
Computer test: A. Baumann: Gustav 4.2a
FEN: 6K1/8/8/8/1N6/B7/7P/kB6
Input: Zuncke/Bruder, 2010-09-12
Last update: Dieter Berlin, 2024-04-02 more...
Genre: n#, Retro
Computer test: A. Baumann: Gustav 4.2a
FEN: 6K1/8/8/8/1N6/B7/7P/kB6
Input: Zuncke/Bruder, 2010-09-12
Last update: Dieter Berlin, 2024-04-02 more...
1. ... fxg6! 2. Se2 g5 3. Kg3 g4 4. h3 gxh3 5. Kf2 Kh2 6. Sd4 Kh1 7. Sf5 Kh2 8. Se3 Kh1 9. Sf1 h2 10. Sg3#
1. Tf6? Kxg1 2. Txf7 Kh1 3. Tf1# but BTM
1. Tf6? Kxg1 2. Txf7 Kh1 3. Tf1# but BTM
Keywords: Miniature Collection (0344079), No legal last move for Black, Minimal, Miniature
Genre: n#, Retro
FEN: 8/5p2/6R1/8/8/7K/7P/6Nk
Input: Zuncke/Bruder, 2010-09-12
Last update: A.Buchanan, 2023-12-05 more...
Genre: n#, Retro
FEN: 8/5p2/6R1/8/8/7K/7P/6Nk
Input: Zuncke/Bruder, 2010-09-12
Last update: A.Buchanan, 2023-12-05 more...
R: 1. Sc5xTe6 h7xTg6, dann 1. Te6-d6 Tg6-g5#
Cook: R: 1. Sc5-e6 (oder Sc5xTe6) Kc4xTd5, dann 1. Kc4-b5 Sc5-d3# (oder Sa6#)
Cook: R: 1. Sc5-e6 (oder Sc5xTe6) Kc4xTd5, dann 1. Kc4-b5 Sc5-d3# (oder Sa6#)
Motto: "Our play"
Originalforderung 1.White played last, retract his move 2.Black retracts his last move 3.Black plays so as to enable-- 4.White to mate 5.No Queens
A.Buchanan: The issue is that wPb3 covers a4. Rotate the board clockwise by 90 deg & shift wPc7 to c5 gives unique queenless solution R: 1. Se6xTf4 g3xTf2, dann 1. Tf5 Te2#, together with 68 queeny tries. (2022-11-13)
Adrian Storisteanu: The wQ is, unfortunately, extremely deadly. In your suggested position, there are still cooks, e.g.,
- 1.Kg6xPg7 g3xQf2 & 1.g3-g2 Qf2-e3#
- 1.Sg2xRf4 e3xQf2 & 1.Rf4-e4 Qf2-f6# (2022-11-13)
A.Buchanan: Yes I make no attempt to remove the "keine Damen" constraint, which is a kind of thematic aid that Baird employs quite often. deadpos identifies 69 solutions in the rotated position 8/6K1/8/2Ppk3/5N2/8/5p2/8, of which 68 require a queen (2022-11-13)
Adrian Storisteanu: The "no queens" constraint seems here almost thematic, as the intended solution works just as fine with a wQ uncapture: - 1.Sc5xRe6 h7xQg6 & 1.Re6-d6 Qg6-g5#... (2022-11-13)
Adrian Storisteanu: (What is "deadpos"?) (2022-11-13)
Adrian Storisteanu: A quick fix along your intention is also -wPb3,+bPc4 (90 queeny tries). (2022-11-13)
A.Buchanan: deadpos is a software engine that determines very efficiently whether a position is dead or not, and allows stipulations such as h=, hdp, h#. Simple retractions are also important for DP last move problems, and since no-one who's written help retractor functionality has ever made it public, this is of use for testing neglected problems such as Mrs Baird's, which have little to do with DP rule. A broader name for this engine will probably emerge at some point.
Your fix -wPb3, + bPc4 also works! (2022-11-13)
comment
Originalforderung 1.White played last, retract his move 2.Black retracts his last move 3.Black plays so as to enable-- 4.White to mate 5.No Queens
A.Buchanan: The issue is that wPb3 covers a4. Rotate the board clockwise by 90 deg & shift wPc7 to c5 gives unique queenless solution R: 1. Se6xTf4 g3xTf2, dann 1. Tf5 Te2#, together with 68 queeny tries. (2022-11-13)
Adrian Storisteanu: The wQ is, unfortunately, extremely deadly. In your suggested position, there are still cooks, e.g.,
- 1.Kg6xPg7 g3xQf2 & 1.g3-g2 Qf2-e3#
- 1.Sg2xRf4 e3xQf2 & 1.Rf4-e4 Qf2-f6# (2022-11-13)
A.Buchanan: Yes I make no attempt to remove the "keine Damen" constraint, which is a kind of thematic aid that Baird employs quite often. deadpos identifies 69 solutions in the rotated position 8/6K1/8/2Ppk3/5N2/8/5p2/8, of which 68 require a queen (2022-11-13)
Adrian Storisteanu: The "no queens" constraint seems here almost thematic, as the intended solution works just as fine with a wQ uncapture: - 1.Sc5xRe6 h7xQg6 & 1.Re6-d6 Qg6-g5#... (2022-11-13)
Adrian Storisteanu: (What is "deadpos"?) (2022-11-13)
Adrian Storisteanu: A quick fix along your intention is also -wPb3,+bPc4 (90 queeny tries). (2022-11-13)
A.Buchanan: deadpos is a software engine that determines very efficiently whether a position is dead or not, and allows stipulations such as h=, hdp, h#. Simple retractions are also important for DP last move problems, and since no-one who's written help retractor functionality has ever made it public, this is of use for testing neglected problems such as Mrs Baird's, which have little to do with DP rule. A broader name for this engine will probably emerge at some point.
Your fix -wPb3, + bPc4 also works! (2022-11-13)
comment
Keywords: Help retractor, Miniature, Constrained problem, Superseded by (P1414378)
Genre: Retro
Computer test: C- deadpos v1.0: 1 solution + 2x2 cooks
FEN: 8/1K6/4N1p1/3k4/3p4/1P6/8/8
Reprints: 66 Twentieth Century Retractor 1907
Input: Mario Richter, 2011-01-23
Last update: A.Buchanan, 2024-01-08 more...
Genre: Retro
Computer test: C- deadpos v1.0: 1 solution + 2x2 cooks
FEN: 8/1K6/4N1p1/3k4/3p4/1P6/8/8
Reprints: 66 Twentieth Century Retractor 1907
Input: Mario Richter, 2011-01-23
Last update: A.Buchanan, 2024-01-08 more...
R: 1. Kb8xSa8
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
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...
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...
34 - P1301781
Stanislav Vokal
784 Seven Chess Notes 2008
Spezielle ehrende Erwähnung
(2+5) C+
#2
b) -Ta7
Stanislav Vokal
784 Seven Chess Notes 2008
Spezielle ehrende Erwähnung
(2+5) C+
#2
b) -Ta7
a) 1. ... 0-0-0?
1. Dh7! Kd8 2. Dd7#
b) 1. Dh7? 0-0-0!
1. Dxb7! droht 2. De7,Dxa8#
1. ... Kd8 2. Dd7#
1. ... Kf8 2. Df7#
1. Dh7! Kd8 2. Dd7#
b) 1. Dh7? 0-0-0!
1. Dxb7! droht 2. De7,Dxa8#
1. ... Kd8 2. Dd7#
1. ... Kf8 2. Df7#
35 - P1324999
Andrew Buchanan
9v Problemas 12, p. 285, 10/2015
after Hauke Reddmann
(2+2)
Illegal position.
White to move.
How does the game end?
Andrew Buchanan
9v Problemas 12, p. 285, 10/2015
after Hauke Reddmann
(2+2)
Illegal position.
White to move.
How does the game end?
Author's "Solution" from Problemas magazine [edited]:
"White has no move, and is not in check. But for stalemate to apply, and end the game, it basically requires that the move producing the position was legal (see Law A5.2a). Not only is the position illegal, but no legal last move exists, even from a previously illegal position! So we are stuck in some kind of limbo. The result can perhaps be described as “nearly stalemate”.
Hauke Reddmann described a position like this as “dividing by zero”. It's an exception to the general observation that one can continue to play chess if the wrong player is in check. It seems odd to insist that only the final move in a game has to be legal, but that’s what the rules do. And I think that’s as far down the rabbit hole as we should go today."
Not Thema Null, because set play does not already achieve the stipulation.
A.Buchanan: The forward rules can apply perfectly well to illegal positions (e.g. set play, where we never concern ourselves with the position's legality). But a lacuna comes where a position with no precursor position is delivering mate, stalemate or DP. A #0 should work as well as a #2. In all cases, the FIDE Laws currently require that the prior move (and only that move) be legal. The Law is about catching errors/cheating otb, so I think the Codex should ensure it does not get carried over to problem chess. This problem will then lose its point, but it will have served its purpose and it can be retired to Golden Age, much to Henrik's relief :) (2023-12-15)
comment
A.Buchanan: The forward rules can apply perfectly well to illegal positions (e.g. set play, where we never concern ourselves with the position's legality). But a lacuna comes where a position with no precursor position is delivering mate, stalemate or DP. A #0 should work as well as a #2. In all cases, the FIDE Laws currently require that the prior move (and only that move) be legal. The Law is about catching errors/cheating otb, so I think the Codex should ensure it does not get carried over to problem chess. This problem will then lose its point, but it will have served its purpose and it can be retired to Golden Age, much to Henrik's relief :) (2023-12-15)
comment
Keywords: Lese Majeste, Illegal position, Dead Position, Miniature
Genre: Retro
FEN: 8/8/8/8/8/nk6/P7/K7
Input: A.Buchanan, 2016-09-06
Last update: A.Buchanan, 2019-12-09 more...
Genre: Retro
FEN: 8/8/8/8/8/nk6/P7/K7
Input: A.Buchanan, 2016-09-06
Last update: A.Buchanan, 2019-12-09 more...
1. ... ??
1. Df6! droht 2. De7#,Dxh8#
1. ... Kf8 2. Dxh8#
1. ... Tg8,Tf8 2. De7#
1. ... 0-0?? illegal
1. Df6! droht 2. De7#,Dxh8#
1. ... Kf8 2. Dxh8#
1. ... Tg8,Tf8 2. De7#
1. ... 0-0?? illegal
Henrik Juel: The author name must be a pseudonym (2018-11-22)
Henrik Juel: double threat (2024-02-26)
A.Buchanan: (1) A comment from Volker might be helpful: was it really "John Doe", or is that Volker's joke? (2) What does C+ mean? A discussion in Facebook yesterday suggested "conforms with the author's expectation". Here each of the two threats is separately realized - to me that's sufficient. (2024-02-27)
Henrik Juel: I dislike the dual after 1... h6,h5 (2024-02-27)
comment
Henrik Juel: double threat (2024-02-26)
A.Buchanan: (1) A comment from Volker might be helpful: was it really "John Doe", or is that Volker's joke? (2) What does C+ mean? A discussion in Facebook yesterday suggested "conforms with the author's expectation". Here each of the two threats is separately realized - to me that's sufficient. (2024-02-27)
Henrik Juel: I dislike the dual after 1... h6,h5 (2024-02-27)
comment
Keywords: Minimal (D), Cant Castler, Miniature, Castling position, Doppeldrohung, Model mate (Gnaden-)
Genre: 2#, Retro
FEN: 4k2r/5p1p/3K4/8/8/8/5Q2/8
Input: Felber, Volker, 2018-11-22
Last update: Gunter Jordan, 2024-02-27 more...
Genre: 2#, Retro
FEN: 4k2r/5p1p/3K4/8/8/8/5Q2/8
Input: Felber, Volker, 2018-11-22
Last update: Gunter Jordan, 2024-02-27 more...
R: 1. Bc7xTb8=L Tb7-b8, dann 1. Ta7 c8=D#
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
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
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...
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...
38 - 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?"
(3+3) C+
h#2.5 (2 solutions)
Position after Black's 5,696th move
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?"
(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)
A full solution is really too big for PDB, but it is available at https://www.thehoppermagazine.com/AA084
1. ... Txa2 2. Lg6 Tg2 3. Lh7 Sf7#
not 1. ... 0-0-0 2. Lg6 Tg1 3. Lh7 Sf7#?? (game just ended by 50M)
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)
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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 ...
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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...
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...
1. bxa3+ Kd4 2. Kb2#
Chess problem by AI program ChatGPT
Q: Can you give an example of a chess retrograde analysis problem?
A: A retrograde analysis problem in chess is a problem where the goal is to determine the sequence of moves that led to a given position. For example:
White to move and mate in 2
[FEN "8/8/1p6/1P6/3k4/8/8/K7 w - - 0 1"]
In this problem, the goal is to determine the two moves (one for white and one for black) that led to the position shown. The solution is 1. bxa3+ Kd4 2. Kb2#
Henrik Juel: I do not understand this at all
It seems that ChatGPT is worthless for retro problems (2023-01-29)
A.Buchanan: Generally ChatGPT is amazing. We have entered a new age. Interacting with it reminds me of the first time I sent emails, or used a browser: we have crossed a frontier into engage with a function that will soon be commonplace. I already use it as a work tool for the last week. However it has limited skills and I was surprised it even attempted to construct a chess problem. It’s failure is humorous and kind of dreamlike (2023-01-30)
Henrik Juel: Thanks for your clarification, Andrew
ChatGPT is so amazing that it will give you a grade of B on some university exams; using it is obviously cheating, but do you enforce it?
In my youth calculators were developing fast; initially I banned the use of calculators in my OR exam, but the students were unhappy about it, saying that they were allowed in high school; I was forced to allow calculators, but then the poor students pointed out that the rich students had an unfair advantage; I then bought a few hundred cheap calculators and let the students borrow one for the exam (the rich students were still mad, but had to accept their lot in the social-democratic society of Danmark) (2023-01-30)
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Q: Can you give an example of a chess retrograde analysis problem?
A: A retrograde analysis problem in chess is a problem where the goal is to determine the sequence of moves that led to a given position. For example:
White to move and mate in 2
[FEN "8/8/1p6/1P6/3k4/8/8/K7 w - - 0 1"]
In this problem, the goal is to determine the two moves (one for white and one for black) that led to the position shown. The solution is 1. bxa3+ Kd4 2. Kb2#
Henrik Juel: I do not understand this at all
It seems that ChatGPT is worthless for retro problems (2023-01-29)
A.Buchanan: Generally ChatGPT is amazing. We have entered a new age. Interacting with it reminds me of the first time I sent emails, or used a browser: we have crossed a frontier into engage with a function that will soon be commonplace. I already use it as a work tool for the last week. However it has limited skills and I was surprised it even attempted to construct a chess problem. It’s failure is humorous and kind of dreamlike (2023-01-30)
Henrik Juel: Thanks for your clarification, Andrew
ChatGPT is so amazing that it will give you a grade of B on some university exams; using it is obviously cheating, but do you enforce it?
In my youth calculators were developing fast; initially I banned the use of calculators in my OR exam, but the students were unhappy about it, saying that they were allowed in high school; I was forced to allow calculators, but then the poor students pointed out that the rich students had an unfair advantage; I then bought a few hundred cheap calculators and let the students borrow one for the exam (the rich students were still mad, but had to accept their lot in the social-democratic society of Danmark) (2023-01-30)
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Keywords: Joke, Kindergarten Problem, Minimal, Miniature
Genre: 2#, Retro
FEN: 8/8/1p6/1P6/3k4/8/8/K7
Reprints: Facebook 05/07/2023
Input: A.Buchanan, 2023-01-29
Last update: A.Buchanan, 2023-07-05 more...
Genre: 2#, Retro
FEN: 8/8/1p6/1P6/3k4/8/8/K7
Reprints: Facebook 05/07/2023
Input: A.Buchanan, 2023-01-29
Last update: A.Buchanan, 2023-07-05 more...
40 - P1408844
Joachim Hambros
Discord Chess Problems & Studies Server 11/04/2023
(1+1)
Add White K & P, Black K & P for an illegal cluster
Joachim Hambros
Discord Chess Problems & Studies Server 11/04/2023
(1+1)
Add White K & P, Black K & P for an illegal cluster
a) R: 1. f3xSg2+,f3x~g2=+ dann 1. f3xg2+ Kg1= patt
Since last move was forced (whatever officer was captured on g2), and current position is dead, the current position is illegal under Dead Position rule & convention
Since last move was forced (whatever officer was captured on g2), and current position is dead, the current position is illegal under Dead Position rule & convention
Henrik Juel: adding wKh1, wPg3 and bKh3, bPf3 seems to work... (2023-04-13)
Mario Richter: Henrik, can you please explain why the position you suggested is an IC? (2023-04-14)
A.Buchanan: See I wonder if a problem like this should get the keyword "Illegal position" too, to indicate that the diagram position (before the pieces get added) is not the result of typing issues. (2023-04-14)
Henrik Juel: I was probably wrong, Mario
No need to add 'Illegal position', Andrew; lots of IC problems have an illegal initial diagram (2023-04-14)
A.Buchanan: You were right, Henrik! :)
And for "Add pieces" problems which are not IC, should we have "Illegal position" too? The point, as it would be for joke problems, is to inform that the diagram position does not contain a typo. It's like "[sic]" in prose-writing. (2023-04-15)
Henrik Juel: If my solution works, the problem should be labelled cooked
I guess there is no harm with 'Illegal position', if it helps the solver (2023-04-15)
A.Buchanan: Sorry I wasn't reading carefully enough, Henrik. Your suggested cluster is not illegal (2023-04-15)
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Mario Richter: Henrik, can you please explain why the position you suggested is an IC? (2023-04-14)
A.Buchanan: See I wonder if a problem like this should get the keyword "Illegal position" too, to indicate that the diagram position (before the pieces get added) is not the result of typing issues. (2023-04-14)
Henrik Juel: I was probably wrong, Mario
No need to add 'Illegal position', Andrew; lots of IC problems have an illegal initial diagram (2023-04-14)
A.Buchanan: You were right, Henrik! :)
And for "Add pieces" problems which are not IC, should we have "Illegal position" too? The point, as it would be for joke problems, is to inform that the diagram position does not contain a typo. It's like "[sic]" in prose-writing. (2023-04-15)
Henrik Juel: If my solution works, the problem should be labelled cooked
I guess there is no harm with 'Illegal position', if it helps the solver (2023-04-15)
A.Buchanan: Sorry I wasn't reading carefully enough, Henrik. Your suggested cluster is not illegal (2023-04-15)
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Keywords: Illegal cluster, Kindergarten Problem, Dead Position, Miniature, Homebase
Genre: Retro
FEN: 8/8/8/8/6p1/8/5P2/8
Input: A.Buchanan, 2023-04-13
Last update: A.Buchanan, 2023-04-14 more...
Genre: Retro
FEN: 8/8/8/8/6p1/8/5P2/8
Input: A.Buchanan, 2023-04-13
Last update: A.Buchanan, 2023-04-14 more...
Show statistic for complete result. Show search result faster by using ids.
https://pdb.dieschwalbe.de/search.jsp?expression=COMMENTDATE%3E%3D20220810+AND+G%3D%27Retro%27+AND+NOT+K%3D%27Platzwechsel%27+AND+K%3D%27Miniatur%27
The problems of this query have been registered by the following contributors:
Gerd Wilts (16)Felber, Volker (6)
Michal Dragoun (1)
Frank Müller (1)
Zuncke/Bruder (8)
Mario Richter (2)
A.Buchanan (5)
Rainer Staudte (1)
Miguel Ambrona: The fix proposed by Adrian works.
Verified with Deadpos v.2.2. (2024-01-12)
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