Die Schwalbe

6 problem(s) found in 6592 milliseconds (displaying 6 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='Unterverwandlung im Schlüsselzug' AND K='Scherzaufgabe'] [download as LaTeX]

1 - P1374103
James Malcom
MatPlus.net Forum 26/12/2019
“A Tripley For The Holidays”
P1374103
(7+12) C+
h#3
(-:
3.1
1) 1. Se7 Lxh4 2. 0-0 Lxf6 3. Tf7 Th8#

2) 1. La7 b6 2. 0-0-0 bxa7 3. Td7 a8=D#

3) 1. e1=T Lf1 2. 0-0-0-0-0-0! Lxd3 3. Kd5 Lc4#
play all play one stop play next play all
All three castlings in a helpmate on the same move. Compare to P1227518.

http://matplus.net/start.php?px=1609949816&app=forum&act=posts&fid=gen&tid=2409
A.Buchanan: WinChloe rokagogo only finds the intended solutions, no real P-M duals and no fake rokagogo duals:
1.Cé7 F×h4 2.Rg8(Tf8) F×f6 3.Tf7 Th8‡
1.é1=T Ff1 2.Ré6(Té7) F×d3 3.Rd5 Fç4‡
1.Fa7 b6 2.Rç8(Td8) b×a7 3.Td7 a8=D‡ (2021-01-06)
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Keywords: Joke, Staugaard castling, Castling, Promotion in the mating move (D), under-promotion key (T), Castling as mating move
Genre: h#, Fairies
Computer test: Henrik Juel: Solutions 1 and 2 are C+ by Popeye 4.61 C+ WinChloe Rokagogo: no real P-M duals and no fake Rokagogo duals
FEN: rb2k1nr/2p5/3p1p2/1P3p2/5P1p/1K1p1P1R/4pBB1/8
Input: James Malcom, 2020-04-02
Last update: A.Buchanan, 2024-01-18 more...
2 - P1381267
James Malcom
(1) Mat Plus 21/10/2020
P1381267
(9+13)
#12
(-:
1. a8=sS! Sb6 2. cxb6 cxb6 3. c7 b5 4. c8=S b4 5. Sd6 exd6 6. e7 d5 7. e8=S d4 8. Sf6 gxf6 9. g7 f5 10. g8=S f4 11. Sh6 Sg5 12. Sg4#
play all play one stop play next play all
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Keywords: Joke, Joke promotion (s), konsekutive Umwandlungen 4 (sSSS), under-promotion key (s)
Genre: n#
FEN: 7R/P1p1p1p1/2P1P1P1/2P5/8/1B1P1ppn/4prqk/4Kbnr
Input: James Malcom, 2020-10-24
Last update: Alfred Pfeiffer, 2020-10-24 more...
3 - P1381850
Josef Cumpe
Deutsche Schachzeitung , p. 371, 12/1915
P1381850
(5+2)
#2
A nice range of tries, but a dual:
1. e8=T!
1. ... Kxc2 2. 0-0-0-0-0-0#
1. ... bxc2 2. Dd5,De4#
1. ... Kd4 2. De4#

1. De4+? Kxe4!
1. e8=D? Kxc2!
1. Tc4? Kxc4!
1. Tc3+? Kd4!
play all play one stop play next play all
'DSZ': "Diese Aufgabe regt den Gedanken an, daß die itaienische freie Rochade noch viel besser hätte ausgenützt werden können, als es (ehedem) tatsächlich der Fall war."

ähnelt stark der P1277302
A.Buchanan: @Henrik how should the dual here impact C+ status we assign? What's the general principle we curators should apply, to avoid us having to make subjective judgements? (2021-01-07)
A.Buchanan: My own simple-minded aesthetic says this is a major dual, because one mate achieves no individual expression elsewhere (2021-01-07)
Henrik Juel: The easiest principle is to say that C+ means completely correct: no cooks and no duals
I would permit short mates, because they occur as a result of suboptimal defense, and double threats, if they do not materialize as duals
But it seems fair also to permit minor duals, including promotion mate duals like TD og LD
So I would not label this problem C+ (2021-01-08)
A.Buchanan: Thank you Henrik, for your thoughtful response. A lot is bundled into one bit of information: the value of the C+? flag. I went back to the Codex to learn more. I think C+ should mean (1) it's been tested & (2) it is sound. Sound (which we don't have in PDB yet) for an antagonistic problem (i.e. d# or s#) means three things: (1) there is a solution (2) there's no cook & (3) there's a defence which forces the specified number of moves. Legality doesn't impact soundness, and for antagonistic problems, neither do duals.

The Codex says there is a lot of judgement involved in assessing the impact of duals in a d#. "C+?" is a result of computer analysis, and I don't think there should be any curator subjectivity in determining its value. I think the answer is to have "duals" as a new separate field so that your valuable analyses aren't lost in conversation, and people can understand the spectrum of quality. In the end, maybe people will be able to set up in their profile their personal preference for dual tolerance, but that's probably some way ahead. I think there are naturally core fields (like cooked?, legal?, tested?) and derived fields (like sound? C+?, HC+?) whose values depend on the core ones. I've sent some notes to Gerd along these lines to see what he thinks. Any thoughts yourself? (2021-01-08)
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Keywords: Staugaard castling, under-promotion key (T), Castling as mating move, Miniature, Joke, Minimal, Rokagogo
Genre: 2#, Fairies
Computer test: WinChloe rokagogo is sufficient to test soundness, although there is a dual
FEN: 8/4P3/8/8/8/1p1k4/1PR5/4K2Q
Input: Mario Richter, 2020-11-13
Last update: A.Buchanan, 2024-01-18 more...
4 - P1381916
James Malcom
PDB Website 14/11/2020
P1381916
(13+9)
s#11
(-:
1. h8=T+! Sh6 2. exd8=K! b3 3. a8=sS! b2 4. b8=sL! La7 5. e4 Lb8 6. e5 La7 7. e6 Lb8 8. e7 La7 9. e8=B! Lb8 10. Ta4 La7 11. Txa7 g4#
play all play one stop play next play all
A rather... complicated "joke."
A.Buchanan: If one allows promotion to sB (and there seems no reason to disallow it since promotion to pawn, king and foreign units are allowed) then the problem is cooked. There is no universally agreed notion of how a pawn can move if it starts on the first rank. Does it get a double hop, and if so on which rank? But the problem is unsound in any case. (2022-02-10)
James Malcom: That is if, yes. But I don't think this problem ought to be left as is: a demonstration of the levels of absurdity and tomfoolery old rules used to allow. Promotion to a piece of another color and dummies were loopholes, yes, but promotion to a black pawn was never included, not even implicitly. All pawns are pieces, but not all pieces are pawns. (2022-02-10)
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Keywords: Joke promotion (Ksl), Dummy Pawn, konsekutive Umwandlungen 5 (TKslB), under-promotion key (T), Excelsior white, Golden Age (Dummy Pawn), Illegal position (no wK), Joke
Genre: s#, Fairies
Computer test: Difficult to test at the moment because no engine allows both normal and adversarial promotion.
FEN: 2Rr2n1/PPpBP2P/1pP5/1N4pk/1p4Rb/6pP/4P1P1/1Q6
Input: James Malcom, 2020-11-14
Last update: A.Buchanan, 2023-12-11 more...
5 - P1384869
Charles Dealtry Locock
No. 3. Knowledge Volume 21, p. 24, 01/01/1898
P1384869
(6+4)
Remis
1. e8=sS##! Remis!
play all play one stop play next play all
James Malcom: The 3rd and final one of the trio: https://www.google.com/books/edition/Knowledge/T59AAQAAMAAJ?hl (2021-01-02)
Henrik Juel: Why is this considered remis?
Even when we accept that White may promote to a black officer, the prohibition of putting your own king in check is in effect, so the move is illegal (2021-01-02)
James Malcom: Henrik, that's precisely why it's a joke; they can have numerous meanings. as well.

The solution, on page 47, says this about it: "Both sides being mated simultaneously, the game seems a fair draw."

Compare to the later P1380947. (2021-01-02)
comment
Keywords: Joke, Joke promotion, under-promotion key
Genre: Studies
FEN: 2r5/2PkPR2/5K1p/1P2P3/8/8/8/1q6
Input: James Malcom, 2021-01-02
Last update: James Malcom, 2021-01-02 more...
6 - P1384929
John Augustus Miles
Sussex Chess Magazine 28/02/1883
P1384929
(10+4)
White to move, s#2
Black to move, Remis
a) 1. gxh8=sS! Sf7 2. Se5+ Sxe5#

b) 1. ... Dc8+ 2. Sf5 Dxf5+ 3. Kg3 Dxh3+ 4. Kf2 Df1+ 5. Kg3 Dh3+ Remis
play all play one stop play next play all
Originalforderung:
This Problem's thus enunciated;
And in the statement is no flaw:
White, with first move, can get checkmated;
Black, moving first, can only draw.

Das 'Sussex Chess Magazine' merkt dazu an: "There is a touch of brimstone about this. Strict disciplinarians had better not try it, if they value their peace of mind."
Und da keine Lösungen eingingen, wurde in der Ausgabe vom 14.03.1883 ergänzt: "... we will hint that, in the first part, White takes advantage of the lax wording of the law of promotion by claiming a black piece, and thus 'qui perd gagne'. The second part is plain sailing ..."
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Keywords: Joke, Joke promotion, under-promotion (s), under-promotion key (s)
Genre: 2#
FEN: 7q/6Pp/6kP/8/4rRKR/5NNP/2B5/7Q
Input: James Malcom, 2021-01-03
Last update: James Malcom, 2021-07-17 more...
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The problems of this query have been registered by the following contributors:

James Malcom (5)
Mario Richter (1)