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6 problem(s) found in 2750 milliseconds (displaying 6 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='geduldeter Umwandlungsdual'] [download as LaTeX]

1 - P0576943
Gerson Berlinger
707 Europa-Rochade 04/1989
P0576943
(14+1)
ser-h#31
1. Kh2 2. Kg3 3. Kxf3 4. Ke4 5. Kd5 6. Kc6 7. Kb7 8. Kxa8 9. Kb7 10. Kc6 11. Kc5 12. Kb4 13. Kxb3 14. Ka2 15. Kxa1 16. Kb1 17. Kc2 18. Kd3 19. Ke4 20. Kxf4 21. Kg5 22. Kxh6 23. Kg7 24. Kxh8 25. Kg7 26. Kh6 27. Kxh5 28. Kh4 29. Kxh3 30. Kh2 31. Kh1 h8=D/T#
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Anton Baumann: abgesehen vom Mattdual: C+ Gustav 4.1d (2021-01-07)
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comment
Keywords: Series mover, Tolerated dual promotion
Genre: Fairies
FEN: R6N/7P/1P5P/7P/P1N2P2/1B3P1P/8/B4K1k
Reprints: V34 Problemkiste 125) 10/1999
Input: Felber, Volker, 2000-01-03
Last update: A.Buchanan, 2021-01-07 more...
2 - P1273184
Wilhelm Hagemann
Horizont 1947
P1273184
(5+3)
#3
1. b7xa8=S! d5-d4 2. Sa8-b6 d4-d3 3. a7-a8=D,L#
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t/entfernte Springerumwandlung
t/alle Umwandlungen auf demselben Feld;
Henrik Juel: C+ Popeye 4.61 (except for promotion mate dual) (2020-10-24)
comment
Keywords: Promotion (konsekutiv SD/L), Promotion in the key, under-promotion, Promotion in the mating move, Tolerated dual promotion
Genre: 3#
FEN: bB6/PP6/8/3p4/8/8/5K1P/7k
Input: Erich Bartel, 2013-06-26
Last update: A.Buchanan, 2020-10-24 more...
3 - P1287950
Hilmar Ebert
33 Stern 08/08/1991
P1287950
(6+3) C+
#3
1. 0-0-0! d7-d5 2. cxd6ep e4-e3 3. c7-c8=D,T# (UW-Dual)
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Henrik Juel: C+ Popeye 4.61 (apart from the promotion mate dual) (2020-09-26)
comment
Keywords: Valladao Task, En passant, Castling as key, Tolerated dual promotion
Genre: 3#
Computer test: Popeye 4.61
FEN: 8/2Pp4/8/N1P5/4p3/P1k5/8/R3K3
Input: Erich Bartel, 2014-09-12
Last update: Alfred Pfeiffer, 2020-09-26 more...
4 - P1375286
Andrew Buchanan
James Malcom

PDB Website 30/4/2020
P1375286
(6+3)
#2
(-:
1. dxc7ep! b4 2. c8=D,T#

R: 1. ... c8-c6?! and earlier c8=sB?!
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Supersession of P1380851

Superseded by P1380851

The 2018 FIDE laws state: "3.7.2 on its first move the pawn may move as in 3.7.1 or alternatively it may advance two squares along the same file, provided that both squares are unoccupied."

Hence Black's newborn 8th rank pawn, which has never been moved before, reserves the right to commence a double-step on its first move, and likewise White receives the right to capture it en passant as they do with a 7th rank pawn.
Henrik Juel: This un-dummy-pawn is like a pawn created on c8 by the Einstein condition
The retroplay looks wrong, what about 1... d8-d6!? 2.d7-d8=sB!? c6xYb5 (2020-04-30)
James Malcom: That makes much more sense Henrik. I have edited it accordingly. (2020-04-30)
A.Buchanan: You don't like Adrian's (: haha? What about :) then? In heraldic terms, it would be described as "regardant". See 270 on https://www.heraldica.org/cgi-bin/atlas.pl?12. I don't know the word for "non-regardant", which is the default direction for the head, e.g. most of the others on that page.
We could replace wBa6a7 with wSa6, but alas having the 3rd knight is non-thematic & distracting. The other thing I would've liked to do is empty b2 so the promotion is forced to be to D. Such a tiny problem should have precision promotion. Needs more thinking. (2020-05-01)
James Malcom: UPDATE: The position has been edited to have one less piece and a precise queen promotion. (2020-10-12)
A.Buchanan: There is dialogue here which is now orphaned by a change of diagram with new matrix. Suggest we revert to the older diagram and mark it superseded by a new PDB entry here (2020-10-12)
James Malcom: I agree-it is now done. (2020-10-12)
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comment
Keywords: En passant, En passant as key, Joke, Joke promotion (b), Tolerated dual promotion (D/T), Promotion (D, T), Superseded by (P1380851)
Genre: 2#, Retro
FEN: k7/PN1N4/PKpP4/1p6/8/8/8/8
Input: James Malcom, 2020-04-30
Last update: James Malcom, 2020-12-17 more...
5 - P1389166
Andrew Buchanan
Retros mailing list 12/12/2012
P1389166
(2+1) C+
#3
b) Capture the King: win in 2 moves
1. Kf6 Kh7 2. f8=T Kh6 3. Th8#
1. Kg6 Kg8 2. fxg8=D,T,L,S 1. ... Kg7/Kh7 2. Kxg7/Kxh7
play all play one stop play next play all

Duplicate Diagram: P1013439

Henrik Juel: part a) is C+ Popeye 4.61
1.Kf6 Kh7 2.f8=T Kh6 3.Th8#
part b) is damaged by a promotion dual...
1.Kg6 Kg8 2.fxg8=DTLS, 1... Kg7,Kh7 2.KxK (2021-05-02)
A.Buchanan: The point about promotion dual hadn't occurred to me: interesting! On reflection, I think it's like the tolerated dual in regular chess, where if the mating move is =Q/R or =Q/B that's ok, because it would be unreasonable to exclude from soundness all promotion mates where the mated king is not very near to the promoted unit. Similarly here, the promotion captures the opposing king, so the promotion choice is academic. Nevertheless, we would not wish to render unsound *all* king-capturing promotion moves, so we need a tolerated dual! Ground-breaking! :D Thanks so much (2021-05-02)
comment
Keywords: Capture the King, Kindergarten Problem, Minimal, Miniature, Tolerated dual promotion (DTLS)
Genre: 2#, 3#, Fairies
Computer test: HC+ Popeye 4.61 part a ok part b has "tolerated dual" for Capture the King stip :-)
FEN: 7k/5P2/8/5K2/8/8/8/8
Reprints: chess.stackexchange.com 2/5/2018
Chess Problems & Studies Discord Server 2/5/2021
Input: A.Buchanan, 2021-05-02
Last update: A.Buchanan, 2021-05-11 more...
6 - P1390560
Geir Sune Tallaksen Østmoe
Chess Problems & Studies Discord Server 02/05/2021
4th Place
Discord Composition Tourney 1
P1390560
(14+5)
#1
b) f5->e1 c) f5->g1
Henrik Juel: Black captured [Lc1] and b7xDa6, so in part a) last move was e7-e5
1.dxe6ep#, 1.0-0#, 1.f8=DT# (2021-06-08)
comment
Keywords: Valladao Task, Castling as mating move, En passant, Tolerated dual promotion
Genre: Retro
FEN: B7/p4P2/p7/P2PpK2/6P1/3P1kpP/1P1P2R1/2NN3R
Input: A.Buchanan, 2021-06-08
Last update: A.Buchanan, 2021-06-09 more...
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The problems of this query have been registered by the following contributors:

Felber, Volker (1)
Erich Bartel (2)
James Malcom (1)
A.Buchanan (2)