Die Schwalbe

24 problem(s) found in 3565 milliseconds (displaying 24 problem(s)). [COMMENTDATE>=20220810 AND NOT K='Bauernmatt' AND K='Illegale Stellung'] [download as LaTeX]

1 - P0001141
George Hume
Jamaica Gleaner 12/1891
Weihnachtsturnier 1891
1. Preis
P0001141
(9+9)
Auf welche Gedanken kommen Sie bei dieser Stellung?

Der Ld6 ist keine UWF und der sBg7 wurde auf seinem Ausgangsfeld geschlagen. Nach dem Autor muss der letzte Zug also Lf8-d6 gewesen sein, also illegale Stellung.
Datum der Originalpublikation nicht 100% sicher, laut ACM aus der "Jamaica Gleaner Christmas column".

Originalforderung: How has the position been arrived at and who is the winner, and in how many moves?

From the Jamaica Gleaner: "White mates in two moves. The last move made was by Black playing his Bishop and announcing mate. As it can be demonstrated that the Bishop is not a promoted Pawn and that Black's King's Knight's Pawn was captured on its original square by White's Queen's Knight's Pawn the Black Bishop must have been played from Bishop's square (f8) to Q3 (d6). This being an illegal move, White enforces the penalty of compelling Black to retract it and move his King whereupon White plays 1 PXB(Q) ch (1.gxf8=Q+) and mates next move by 2 Q-B4 (Qf4#). The following is a brief but pointed analysis, demonstrating the false move: White's Pawns have made six captures all on black squares. The Q Kt P (Pb2) made five of these and consequently captured the Kt P on the square upon which it now stands (g7). They could not have captured the Q B which is also lost. The White Bishop is the QRP (Pa2) promoted, the original KB having been captured on its own square as the unmoved Pawns show. To allow this promotion Black's QRP (Pa7) made two captures, the QKtP (Pb7) one, and the QBP (Pc7) two. The KRP (Ph7) has also made a capture, which accounts for the seven pieces White has lost. The Black Bishop is not a promoted Pawn, as if the Black KBP (Pf7) had played to the 7 th square (f2) and then captured a White piece on K or Kt square (e1 or g1) the captures by White Pawns cannot be accounted for without including the Black QB or KRP neither of which is available. As it can be demonstrated, then that the Black Bishop is not a promoted one, and that the KKtP was captured by the White Pawn which now stands on that square, in order to reach Q3 the Black Bishop must have an impossible move.

Der Kolumnist des ACM merkt aber zurecht an:
ACM: The above is a very fine piece of analytical work; but there is a slight flaw in connection with the minor condition, 'mate in two'. In a position of this kind we believe only that which can be proved; thus we do not think that White has any right to enact a penalty, as neither the analysis nor the conditions show that the Black Bishop came from Bishop's square on his last move; indeed, that Bishop may have played outside the Pawns on the very first move of the game which, being played, brought about the position.
HBae: White plays 1 PXB(Q) ch (1.gxf8=Q+). Muß der sK nicht auf f5 stehen? (2019-10-22)
Henrik Juel: Last move (supposedly) was Lf8-d6#, which is obviously impossible and hence illegal
The penalty for this is that Black must replace Ld6 on f8 AND instead make an arbitrary move with his king
So the forward play is
0... Kf5,Kf6,Kh6 1.gxf8=D+ Kg5,Ke5 2.Df4# (2019-10-22)
A.Buchanan: One long-standing approach to resolving illegal diagram jokes is to suppose that only the last move was illegal, with all prior play legal. The illegal move is then retracted, and play continues. Of course, the “illegal move” might in principle be from *any* legal position (even the game array!). So for sanity, we say the illegal move is a simple but somehow illegal shift of a single piece.

So here, candidates for the last move include Pe5-a4+, Sf4-e1+, Ke5-g5+ & B?-d6+. For all of these, White has 6 visible pawn captures, all on dark squares, so Black light-squared bishop is excluded. wPa must have promoted to light-squared bishop, so if the three Black pawns on a-file remain, there is only one unaccounted capture. Thus bPh could not promote, and must be bPg6 now. Thus bPg7 was captured at home, and bBf8 was thus locked in.

So Bf8-d6 is certainly a possible illegal move, but so are e.g. Be8-d6 (as the light-squared bishop is otherwise unexplained) and Pe5-a~. This is an example of an "implausible" joke according to Dawson & Hundsdorfer, because there is more than one retraction to the current position, and one just has to arbitrarily pick the one that makes the forward logic work. (2023-04-02)
A.Buchanan: Another issue is that according to the 1883 laws, White cannot force Black to move their king. The 1883 rules stated:
- If a player touches a piece or Pawn of his own he must move it.
- If he touches one of his adversary's he must take can be taken.
- If he touches plurality of pieces or Pawns of the same colour, in either of these instances his adversary may elect which such piece or Pawn he will call upon him to play or to take, as the case may be.
- If the rules governing the moves of pieces do not admit of the adversary exacting penalty as above, the player must move his King, but may not Castle. If the King cannot be moved without exposure to check, no penalty can then be exacted
So according to this, Black must play Bf8xPg7 as the penalty move.
Was there another revision to the rules between 1883 & 1891? (2023-04-02)
more ...
comment
Keywords: Illegal position, Joke, Retract illegal move (stuck at home), Touch Move, Volet Pawn, Obvious promotion (L)
Genre: Retro
FEN: 6B1/4p1P1/p2b2p1/p5kq/p7/4P1K1/2PPP1PP/3n4
Reprints: American Chess Monthly 1, p. 11, 03/1892
Jamaica Gleaner 30/04/1892
17 Europe Echecs 14 10/1959
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-02 more...
2 - P0002006
Benjamin Glover Laws
Leeds Mercury 12/12/1891
P0002006
(4+7)
#1
Beide Könige stehen im Schach. Schwarz hat zuletzt gezogen, nimmt seinen illegalen Zug zurück und muß stattdessen einen Strafzug mit dem König machen, worauf W mattsetzt.

R: 1. ... d2xSe1=S, dann 1. Kxc3 Dh8#
play all play one stop play next play all
Lösung gemäß 'Retrograde Analysis':
"... both Kings are in check, and we are obviously confronted with something decidedly illegal.
...
In No. 7A Black has just played Pd2xS=S. Replace the move and exact the King move penalty. Then Qh8 mate."
Henrik Juel: Accprding to Retrograde Analysis, 1915, the intended solution does not involve adding pieces as such, rather:
Black retracts the illegal move Pd2xSe1=S+ (exposing Kb2 to a selfcheck from Dh2)
and instead pays the penalty of a king move, Kxc3 (only possibility)
Then White mates by 1.Dh8# (2023-04-13)
Mario Richter: @Andrew: Why did you remove the "illegal position" keyword?
Instead of removing this keyword, I suggest to remove the "Add pieces" KW ... (2023-04-14)
A.Buchanan: Hi Mario, yes good question. I removed "Illegal position" from some genuine "Add pieces" compositions, because it suggests some error in the composition. But on reflection, I think I will put the "Illegal position" back for these, and instead edit the description for the keyword.

Now this problem was in fact incorrectly marked as Add pieces. It's one of Dawson & Hundsdorfer's canonical examples of an "implausible" joke. I.e there is no reason why the intended retraction is the right one, except that it works. These too should be marked as illegal position. Sorry for all confusion (2023-04-14)
comment
Keywords: Joke, Retract illegal move, Illegal position
Genre: Retro
FEN: 6B1/8/8/8/1n3p2/b1N2K2/1k5Q/r1q1n3
Reprints: 7A Retrograde Analysis 1915
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-14 more...
3 - P0003839
Radu Dragoescu
RA44 diagrammes 23 09-10/1976
Jean Oudot gewidmet
P0003839
(16+16)
Wieviele Figuren muß man entfernen, damit die Stellung legal wird?
A.Buchanan: In each of the 4 pairs of adjacent files, one cross-capture suffices. So removing 8 officers is enough. However, they need to be an even number from each side.
However it's possible to do better by removing pawns: wPadgh bPcf = 6 units. Now wPaxb bPcxb wPdxe bPfxe.
Is it possible with 5 or less? (2022-03-17)
Bob Baker: I find it interesting that the composer specified piece removals, since six captures suffice. Does that imply that 5 or less is possible by removing pieces? (2023-04-27)
A.Buchanan: I think the German term "Figuren" (like the English "pieces") can have two senses, either all 16 pieces or just the officers. Wikipidie.ge uses the phrase "im engeren Sinne" = "in the narrower sense" to distinguish. But maybe a native German speaker can be more authoritative here:

Auf dem Schachbrett befinden sich zu Beginn einer Partie insgesamt 32 Schachfiguren (auch als Steine bezeichnet), 16 weiße und 16 schwarze. Beide Spieler (bezeichnet als Weiß und Schwarz oder als Anziehender und Nachziehender) haben je folgende Schachfiguren zur Verfügung:
- acht Figuren im engeren Sinne:
= den König
= die Dame und zwei Türme (Schwerfiguren)
= zwei Springer und zwei Läufer (Leichtfiguren)
- acht Bauern (2023-04-27)
A.Buchanan: And the Originaldforderung would have been in French, surely (2023-04-27)
Bob Baker: A stipulation might have been "Reach the position with the greatest number of pieces still on the board." A position with six fewer men can be reached with no removals from the initial array. It would be a harder problem than if pieces can just be taken off the board. But maybe allowing removals could make 5 or less possible. (2023-04-28)
A.Buchanan: Not quite sure what you are saying. Generally, capturing pawns is more efficient than capturing officers to get pawns past one another, but here we have no doubled pawns. If we have a solution with 5 units including a missing officer, then might as well promote a pawn to replace it. So we can reduce our search to positions where 5 pawns have been removed (2023-04-28)
Bob Baker: I'm suggesting if six really is the answer, it would be a better (more challenging) problem to require a proof game with no removals except by capturing. (2023-04-28)
Bob Baker: Also, I think this may have been the composer's intent, but the stipulation was misunderstood as allowing pieces to be taken off the board without being captured. (2023-04-28)
Bob Baker: I just realized that the misunderstanding of the composer's intent was on my part, so all my previous comments should be disregarded. (2023-04-28)
Carot: I understand that all 16+16 figures are meant.
So for the e-row 1. e4 e5 2. e4f5 e5f4 3. f5e6 f4f3
This is illegal, so only the e-line is considered, one e-pawn too many to reach the given position legally.

I am just a beginner in Chess, but i think en passant is useable and therefore maybe less then 8 pieces have to removed, but i tried an hour and found no way for optimisation. :(..

I would be happy about an idea. Please share. I go study pawn endgames now.
I am happy to found this site and many old combinations of Max Lange. (2023-04-28)
Bob Baker: Play this game for a quick way to remove six pieces.
1. a4 a5 2. b4 b5 3. c4 c5 4. d4 d5 5. e4 e5 6. f4 f5 7. g4 g5 8. h4 h5 9. axb5
hxg4 10. bxc5 gxf4 11. exf5 dxc4 12. b6 a4 13. c6 a3 14. d5 c3 15. d6 e4 16. f6
e3 17. h5 f3 18. h6 g3 (2023-04-29)
more ...
comment
Keywords: Remove pieces, Illegal position
Genre: Retro
FEN: rnbqkbnr/8/PPPPPPPP/8/8/pppppppp/8/RNBQKBNR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-27 more...
4 - P0005585
Hieronymus Fischer
56 Fern vom Alltag 1925
P0005585
(5+12)
#0
Einer der sTT muß nach a8 zurückgestellt werden.
play all play one stop play next play all
Lösung aus '64 Schach-Scherze': "Da noch sämtliche schwarze Bauern vorhanden sind, kann keiner der beiden schwarzen Türme durch Umwandlung entstanden sein.
Nun kann aber der schwarze Turm von a8 unmöglich 'herausgekommen' sein. Mithin ist einer der beiden schwarzen Türme nach a8 (oder a7 oder b8) zurückzustellen.
Nach dieser Korrektur ist Schwarz von selbst matt."
in '64 Schach-Scherze' nachgedruckt mit der Forderung "Matt in gar keinem Zug"

vgl. P1309484
Erich Bartel: weiterer Nachdruck (oder Erstquelle?!):
3) 28) 64 Schachscherze 1916 (in dieser Quelle ist kein
Hinweis ob Urdruck oder Nachdruck) (2007-10-30)
Alain Brobecker: Same position and stipulation as P1265678, except the latter one is dated 1910. (2022-11-15)
comment
Keywords: Joke, Illegal position (can't leave home)
Genre: Retro
FEN: 2b5/1pppR1p1/p4p2/3p3p/4r3/4kr1R/2P1N3/4K3
Reprints: 28 64 Schach-Scherze 1915
Das Geheimnis des schwarzen Königs 1960
(III) Die Schwalbe 22 08/1973
Input: Gerd Wilts, 1995-06-05
Last update: A.Buchanan, 2019-10-22 more...
5 - P0513497
Jean-Marc Loustau
1001 Ideal-Mate Review 01-02/1985
P0513497
(4+1) C+
h#3.5
1. ... Sf2 2. Kg1 g3 3. Kh2 Sg4+ 4. Kh3 Lg2#
play all play one stop play next play all
Jean Marc Loustau: The setting is not legal, but it is without impotance here... Let us say it is "fairy" (2003-05-08)
A.Buchanan: Legality/illegality is orthogonal to fairy. Let us say here it is "not fairy". (2023-07-09)
Adrian Storisteanu: Add, say, "circe" under the diagram, and all is pretty cool. Even cooler, "chess960". (2023-07-10)
paul: cond einstein
stip h#2.5 forsyth 8/8/8/7k/8/5K1B/3R2P1/8

Two solutions (2023-07-10)
comment
Keywords: Illegal position (wLh1), Miniature, Symmetrical constellation
Genre: h#
Computer test: (Popeye C-Version 3.52 (2048 KB))
FEN: 8/8/8/8/8/5K1N/6P1/5k1B
Reprints: 1683 Ideal-Mate Encyclopedia Vol.1 1999
Input: Markus Manhart, 1997-09-30
Last update: A.Buchanan, 2023-07-09 more...
6 - P0551807
Tibor Ersek
3980v Magyar Sakkelet 12/1975
P0551807
(6+6) cooked
h#2
b) wBb6 nach f4
a) 1. Txf6 Ld7 2. Dxb4 Txd5#
b) 1. Dxb4 Tc4 2. Txf6 e5#

NL:
a) 1. Kd7 Ld2 2. Dxd4 Txe6#
play all play one stop play next play all
Author: The WK must stay on g1! 3 Solutions, no cook! (2006-01-30)
A.Buchanan: Adding wKg1 certainly makes this sound, but I don't understand why "Author" says "3 solutions" (2023-05-28)
comment
Keywords: Sacrifice of white pieces, Illegal position (no wK)
Genre: h#
FEN: 8/4b3/1P1krR2/2qp1B2/1B1RP3/5p2/8/8
Input: Hans-Jürgen Schäfer, 1997-10-11
Last update: A.Buchanan, 2023-12-11 more...
7 - P1013621
Hans Gruber
Jörg Kuhlmann

feenschach 12/1983
P1013621
(2+2)
H#2
1. Tb1 Th6 2. Tb8 Ta6#
Im Rahmen einer Parodie publiziert.
play all play one stop play next play all

Duplicate Diagram: P0549015

Henrik Juel: C+ Popeye 4.61 (2023-12-11)
comment
Keywords: Illegal position (no wK)
Genre: h#
FEN: k7/8/8/N7/8/8/8/r6R
Input: Hans Gruber, 2004-05-01
Last update: A.Buchanan, 2023-12-11 more...
8 - P1020334
Maria Rennie
185 Canadian Chess Problems , p. 187, 1890
P1020334
(12+10)
#2
1. Se3!
play all play one stop play next play all
BS Problemid: 5177
Authors: Rennie, Maria Deering
Sources:
Years: 0000
Mario Richter: Stellung ist illegal (wLh8) (2009-06-21)
Henrik Juel: and duals after 1... c6,g6 (2024-02-24)
comment
Keywords: Brian Stephenson Collection (5177), Illegal position (wLh8), Symmetrical constellation
Genre: 2#
FEN: 1Q5B/1pp1N1pp/3npn2/2P1k1P1/3p1p2/3P1P2/3RPR2/3N1K2
Input: Brian Stephenson, 2004-08-12
Last update: Dieter Berlin, 2024-02-24 more...
9 - P1162830
Heinrich Drasch
55 Neues Wiener Tagblatt , p. 14, 31/12/1908
P1162830
(5+1)
#3
1. Lg3! Kxd7 2. Lb7 Kd8 3. Td5#
2. ... Ke6 3. Lc8#
1. ... Kxf5 2. Kg7 Kg5 3. Td5#
2. ... Ke6 3. Lg4#
play all play one stop play next play all
E730 A10TL1 m
Illegal position, see https://gameknot.com/comment.pl?t=2&k=231140
Henrik Juel: apart from the illegal position 'C+ Popeye 4.61' (2023-04-14)
comment
Keywords: Miniature Collection (0323972), Illegal position, Aristocrat, Miniature
Genre: 3#
FEN: 5K2/3R4/4k3/4BR2/8/5B2/8/8
Reprints: 2821 Wiener Schachzeitung 14-16 07-08/1910
Input: Zuncke/Bruder, 2010-09-12
Last update: Rainer Staudte, 2023-10-29 more...
10 - P1179497
Vladislav Bunka
9708 Sachova skladba 07/2009
P1179497
(10+2)
s#5
1. Kc1 d5 2. Lf3+ Kd3 3. Dh6 d4 4. Ld1 dxc3 5. Dd2+ cxd2#
1. Kc1 d6 2. Lc2+ dxe5 3. Dh1 e4 4. Le1 e3 5. Ld2 exd2#
play all play one stop play next play all
Frank Müller: Die Stellung ist im Vorwärtsspiel C+. Gleichwohl ist die Stellung retroanalytisch nicht erspielbar, da Schwarz keinen letzten Zug hat. Man kann vermuten, dass der Autor dies übersehen hat.
Um allen Diskussionen aus den Weg zu gehen, habe ich c+ und cooked gelöscht.
Mario Richter: Schwarz hat keinen letzten Zug, müßte also eigentlich in der Lösung beginnen. (2010-11-07)
Olaf Jenkner: Sollte auf Cooked und unlösbar gesetzt werden. (2010-12-31)
Frank Müller: Die Aufgabe ist im Vorwärtsspiel korrekt, erfüllt also die Forderung. Das die Stellung retroanalytisch nicht herleitbar ist, ist sicherliche eine (deutliche) Schwäche des Problems, aber deswegen wird die Aufgabe nicht unlösbar. Ich habe jedoch das Keyword illegale Stellung hinzugefügt. Dies kennzeichnet wohl am Besten die Unsauberkeit der Aufgabe. (2010-12-31)
Olaf Jenkner: Die Stellung ist legal und in Fällen, wo die normalerweise anziehende Partei aufgrund retroanalytischer Überlegungen nicht am Zug sein kann, zieht automatisch die andere Seite. Damit wäre die Autorlösung fehlerhaft und es existiert keine korrekte Lösung. Allerdings kenne ich den Kodex nicht so gut, aber es gibt da ausgewiesene Experten, die sich um viel kompliziertere Dinge kümmern. (2010-12-31)
HBae: Das sollte der Autor korrigieren durch einen anderen Schlüsselzug (mit wKc1 in der Ausgangsstellung). Letzter schwarzer Zug wäre dann Kf1-e2 gewesen. Ich hätte einen akzeptablen Vorschlag (C+), möchte dem Autor aber nicht vorgreifen. (2010-12-31)
Mario Richter: Die Labels 'C+' und 'illegale Stellung' behagen mir nicht - beide sind eigentlich falsch. Dummerweise ist hier wie an vielen anderen Stellen auch der Codex ziemlich schwammig formuliert (leider), trotzdem mal die relevanten Stellen:
"Article 15 - First Move: If the first move does not lie with the conventional party (examples see Footnote 9), this should either be indicated in the stipulation or deducible from retroanalysis. ...
Footnote 19: ... The number of moves to be expressed in the stipulation should be the number of moves to be made by White." (2011-01-08)
Anton Baumann: mögliche Korrektur: +wBa5, +sBa6 (2023-12-22)
Vaclav Kotesovec: Judge Christer Jonsson excluded this problem from the award (see Sachova skladba 111/2011, p. 2770), so I removed "1. Lob". (2023-12-22)
SCHRECKE: Den Vorschlag von HBae aufgreifend, wäre die Aufgabe ohne zusätzliches Material zu retten:
wKc1, wTe5 nach e8 - 1. Te5! (2023-12-22)
comment
Keywords: Pawn step variations, Illegal position (with WTM), Minimal
Genre: s#
FEN: 8/3p4/8/4R3/4B1N1/1PP4Q/1PK1kB2/1R6
Input: Frank Müller, 2010-11-03
Last update: Vaclav Kotesovec, 2023-12-22 more...
11 - P1195355
Torsten Linss
Dieter Müller

210 Vratnica-64 6 04-06/2002
Lob
Miloseski-60-Jubiläumsturnier
P1195355
(5+14) C+
h#3
b) wLa5->a1
a) 1. Te4 Sb4 2. Td8 Txd8 3. d5 Txd5#
b) 1. Te2 Sd4 2. Tb8 Txb8 3. b5 Txb5#
play all play one stop play next play all
Doppelveröffentlichung
Mario Richter: Illegale Stellung (Grund: Der weiße König konnte die 7./8. Reihe nie erreichen) (2011-06-10)
TLi: Die behauptete Doppelveröffentlichung kann ich nicht nachvollziehen. (2022-09-19)
comment
Keywords: Illegal position (wKh8)
Genre: h#
Computer test: Popeye Windows-32Bit v4.51 (100000 KB)
FEN: n3rrRK/bpp2pp1/3p1p2/B1k5/8/1P6/n1N3q1/5b2
Reprints: Vratnica-64 2008
Input: hpr, 2011-05-11
Last update: Gunter Jordan, 2020-01-09 more...
12 - P1234614
Petko A. Petkov
886 idee & form 07/1997
Dirk Borst gewidmet
1. Preis
P1234614
(13+13) C+
s#5
1. Da8! droht 2. Sf7+ Kf5 3. Sxe3+ Kf4 4. Ta6+ Kxe3 5. De4+ Lxe4#
1. ... Sd7 2. Tc6+ Kxd5 3. Td6+ Ke5 4. Td4+ Kxe6 5. Te4+ Lxe4#
1. ... Sc6 2. Td7+ Kxe6 3. Td6+ Ke5 4. Txf6+ Kxd5 5. Tf5+ Lxf5#
1. ... Txf3 2. Tb6+ Ke4 3. Sxf6+ Kd3 4. Dd5+ Kc2,Kxc3 5. Dd2+ exd2#
1. ... f5 2. Sg4+ fxg4 3. h8=D+ Kf5 4. Dh7+ Ke5 5. De4+ Lxe4#
4. ... Kg5 5. Dg6+ Lxg6#
play all play one stop play next play all
Raúl Jordan entdeckte, dass diese Stellung illegal ist!
FA=8.5 Transformation of white batteries, removal of white impediment, echoed play
Walter Lindenthal: Die illegale B-Schlagbilanz kann sehr einfach über den "unbrauchbaren" wB[a2] und die Rückwirkung auf sBh4 erkannt werden. (2023-08-28)
comment
Keywords: Beseitigung hinderlicher Masse, Switchback after capture, Illegal position
Genre: s#
FEN: 1nB5/2B1P2P/2QRPp1N/2pNk2P/2p4p/2P1pP2/p3pr2/rb2K1n1
Reprints: F59 FIDE Album 1995-1997 2004
Input: Frank Müller, 2012-03-16
Last update: Marcin Banaszek, 2023-11-04 more...
13 - P1262999
Ralf Krätschmer
62 Rhein Main Presse 28/12/1996
P1262999
(6+13) C+
#6
1. Dd3+? exd3!, 1. ... Kxc5 2. Ld6+ exd6!

1. Th2! droht 2. Td2#
1. ... e3 2. Th5 Txh5+ 3. Kg1 Th7,Te5 4. Sxe7+ Txe7 5. Dd3+ Kxc5 6. Ld6#
play all play one stop play next play all
Henrik Juel: apart from the illegal position, C+ Popeye 4.61 (2023-07-13)
more ...
comment
Keywords: Illegal position, Sacrifice of white pieces (TSS)
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 6Nb/1pBpp3/1rb2p2/1pNkr3/4p1pR/1pQ5/8/7K
Input: Felber, Volker, 2013-02-22
Last update: Dieter Berlin, 2023-07-13 more...
14 - P1322154
Antoine Huberty
AJEC (Belgischer Fernschachbund) 01/10/1935
P1322154
(13+12)
#1 (Wer?)
1. Dc4#
play all play one stop play next play all
Mit Weiß von unten nach oben spielend wäre die Stellung illegal, also spielt Weiß von oben nach unten (Drehung um 180°) und kann mit 1. Dc4 (oder präziser 1. Df5 beim richtig orientierten Brett) mattsetzen.
eingebettet in eine Geschichte "Un peu de fantaisie - qui fait mat en un coup"
Henrik Juel: The reason for illegality is too many white pawn captures
axb, bxcxd, hxg need four missing black men, which is indeed the case, but [Lc8] was captured at home by an officer (2016-07-10)
A.Buchanan: 1.Sg3#? is the thematic try (2023-04-03)
comment
Keywords: Joke, Illegal position, Whose move?, Board Rotation
Genre: Retro
FEN: 1rn5/NpQp2b1/1P2p1P1/p2P1p2/1k2P2p/5P2/R1PP2P1/1N1K1n1r
Input: Mario Richter, 2016-07-10
Last update: A.Buchanan, 2023-04-03 more...
15 - P1324999
Andrew Buchanan
9v Problemas 12, p. 285, 10/2015
after Hauke Reddmann
P1324999
(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
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...
16 - P1340096
Rolf Uppström
1587 Springaren 144 06/2017
P1340096
(4+4)
h#1
2 Lösungen
Lame
a) wBc1->h7 1. Kh2 h8=D#,h8=T#
b) wBc1->h2 1. gxh2 Sf2#
play all play one stop play next play all
The condition Lame means that the position is illegal and must be made legal by adding, moving, or removing one man, before White moves. See P1340078.
Veröffentlicht in der Rubrik: "Smasaker och Hugskott"
Henrik Juel: The condition Lame means that the position is illegal and must be made legal by adding, moving, or removing one man, before the stipulated play starts (2017-09-24)
Alfred Pfeiffer: NL nach wBc1->h7: 1. Ld5,..,La8 h8=D,T# (2017-09-25)
A.Buchanan: Is it bPg2? (2024-01-17)
A.Buchanan: I don't know how it is in Swedish, but in English, Lame is a slur. And the acronym doesn't work. I would suggest "Alarm" instead, standing for "Alarm! Legalize by Adding, Removing or Moving". But with only two examples, it's not worth a keyword yet. (2024-01-17)
comment
Keywords: Promotion (in 1), Smothered mate (in 2), pin-mate (in 1), Illegal position, Selfblock (in 2)
Genre: Fairies
FEN: 8/8/8/8/8/2K3p1/2R3b1/2PN2rk
Input: Gunter Jordan, 2017-09-24
Last update: A.Buchanan, 2024-01-17 more...
17 - P1340386
Georges Emile Barbier
Recreationist 06/1873
P1340386
(6+8)
#2
1) R: 1. ... 0-0, dann 1. Kxd8 Lf6+ 2. Ke8 De4#,bxc8=D/T
1. ... bxc8=D/T+ 2. Kxc8 Da8#
2) R: 1. ... 0-0, dann 1. Tg8,Tf8 De4+ 2. Kxd8 De7#
play all play one stop play next play all
Heft 7 (08/1873) S.91: The position being one occuring in actual play with White to move, the question is 'What was Black's last move?'. Clearly not a pawn or bishop. Neither could it have been the Kt, for it must have moved from B4 or Kt5, and from either square it would have checked the White K, which must consequently have moved, and therefore could not occupy K 3, as given on the diagram. Nor could the Rook have moved from K square for a similiar reason, the check requiring one of the white pieces to cover it, or the King to move. Then the Black King must have moved - but from where? Not from B or R squares, which are guarded by two pieces. It must have moved therefore from K square, which necessitates the placing of the Rook on its square. Black therefore Castled on his last move, which by the Chess law was an illegal move, and he must pay the penalty by replacing the King and Rook on their original squares, and move one of the pieces touched.
Originalforderung: How is it possible for White to effect mate in two moves by strict chess?

'Recreationist': "A CHESS PUZZLE. We give below an interesting position which is to be looked upon as an end game occuring in actual play. It is calculated to test the ingenuity of those of our subscribers who delight in unravelling mysteries."

Erinnert von der Machart her an P1323153 und ähnlich gelagerte Probleme.

Interessanter Leserbrief von F. Dunne Okt. 1873 S.121: "It appears to me (albeit I amone of the solvers), that Mr. Barber's 'logical' solution of his Chess Puzzle is 'il'-logical, and I believe the following will clearly prove it so. Mr. Barbier says, 'What was Black's last move? Clearly not a pawn or bishop'; and he proceeds to prove that Black 'must' have made a false move with his King, 'because' he could not legally have moved it or any other piece into the position it or they now occupy.
Now surely that is not 'logically' proving that he 'must' have moved his King! For by the same 'logic' I can prove that he must have made a false move with, say, the Knight or any other piece.
'What was Black's last move? Clearly not the King, for all the squares from he could have reached the one he now occupies, are already occupied, either by his own, or by his opponet's pieces, or under the range of the latter's pieces; and he could not have Castled, as the square over which he would have to pass is commanded by one of the adverse pieces.
It is quite evident the pawns have not been moved, and, therefore also, not the bishop. The Rook cannot have been move last, or the White King would not occupy the square he now does. The he 'must' have moved the Kt, and as he could not legally have moved this piece to the square it now occupies, he must have made a false move with it.
Now, one conclusion is as logically arrived at as the other, and by parity of reasoning any other of Black's pieces can be proved to be te one last moved, as Castling across check is no more strict Chess, than wrongly moving a piece."

Gedanken dieser Art haben vermutlich Roberto Osorio & Co. zur Einführung des Begriffs MDR (Minimum Deviation from the Rules) inspiriert (s. Hinweis P0005584)

Antwort vom Autor im 'Recreationist 12/1873 S.154: "In reply to Mr. Dunne's letter in No.9 I beg to say that the solution of the Puzzle cannot be taken apart from the conditions attached to it. Any solution means the solution of something or other, and must be taken inconnection with that something.
The question is to find a way in which White mates in two moves. I agree that if, saying nothing about a mate in two moves as a condition, I endeavoured merely to prove Black's last move, Mr. Dunne's argument would be perfectly sound. But the fact of Black's castling is not an absolute fact; it is only relative. He castled because thereby I can mate him in two moves which Mr. Dunne's move does not do, and which is the very thing that is required to be done.
Henrik Juel: So even if one accepts the dubious retro reasoning intended, the problem is cooked by 0... Kxd8 1.bxc8=DT,Lf6+ (2017-09-30)
A.Buchanan: Dubious or not, retract-and-replay *is* one of the canonical chess problem jokes that our great-great-grandparents must have split their sides laughing over. I am pretty sure there is a typo in the diagram. sLc8 should be b8. This restores soundness and adds a retro try. wBb7 is still necessary to cover c8. (2017-09-30)
A.Buchanan: Have pushed sLc8 to b8, to remove the obvious typo. (2018-10-06)
A.Buchanan: I would classify these problems as jokes, not because the positions are illegal, but because imprecise reasoning is required to determine the illegal move. This is a particularly nice example though. Any thoughts? (2018-10-06)
SP: Your "obvious typo" is imaginary; the intended solution after Kd8: is
explicitly stated to be 1.bc8:=Q+ Kc8: 2.Qa8# (p. 91, viii/1873), quite
impossible with a bBb8. Please correct the position. (2023-02-18)
A.Buchanan: Hi SP. thanks for your research. Have you got a link to this material - that would be very helpful for checking similar situations. Otherwise our discussions here are often speculative. Bad news for the composer though: what I had thought was a typo turns out to be a cook. It would be good to know the version of the touch move rules applying in 1873, as the rook penalty move is clearly thematic. (2023-04-03)
A.Buchanan: The stuff about bS having just made an illegal move is basically Dawson & Hundsdorfer's distinction between plausibility & implausibility. This is an implausible composition, and having said that, one need agonize no longer, and just enjoy it for the best it can be at this silly idea (2023-04-03)
comment
Keywords: Illegal position, Joke, Retract illegal move (castling), Touch Move, Castling
Genre: Retro, 2#
FEN: 2bN1rk1/1Ppp1pBp/6Nn/8/8/4K3/8/7Q
Reprints: 617 Dubuque Chess Journal 08/1873
Input: Mario Richter, 2017-09-30
Last update: A.Buchanan, 2023-04-03 more...
18 - P1408252
Ludwig Fried
8 Dresdner Schachblätter 2 1893
P1408252
(10+9)
#4
1. Ta8! (Zugzwang)
1. ... h3 2. Lg3 h2 3. Ta1 h1=D,h1=T/L/S 4. Txh1#
play all play one stop play next play all
'Dresdner Schachblätter': "Vorstehende beiden Probleme [dieses und P1408253] entsprechen zwar in keiner Weise den Anforderungen, die man heutzutage an Endspiele oder gar an Aufgaben zu stellen gewohnt ist; gleichwohl entbehren sie nicht eines gewissen Witzes und einer ziemlich scharfen Ausprägung der ihnen zu Grunde liegenden Idee, und dies mag es rechtfertigen, dass wir sie hier zum Abdruck bringen."
Henrik Juel: 8 black pawns on the diagram, but [Pa7] is not among them (2023-03-15)
comment
Keywords: Illegal position
Genre: n#
FEN: 5R2/6p1/1Pp1p1Pp/2PpN2k/3PpK1p/4Pp2/5P1B/8
Input: Mario Richter, 2023-03-15
Last update: Mario Richter, 2023-03-15 more...
19 - P1408328
W. Bublitz
70 Rheinische Volkswacht 25/02/1922
P1408328
(8+13)
#3
1. Dh4! droht 2. Sd3 ... 3. Sxc8#,Dxf6#
sowie 2. Dd4 ... 3. Sc4#,Sxc8# 2. ... c5 3. Dxf6#,Dxd5#
1. ... Sf3 2. Sd3 droht 3. Sxc8#,Dxf6#
1. ... Se2 2. Sd3 droht 3. Sxc8#,Dxf6#
1. ... Le5 2. Sxc8+ Kc5 3. Sd3#
1. ... Lf4 2. Sd3 Sxh3 3. Sxc8#,Dxf6#
2. ... Sf3,Se2,Lc1,Ld2,Le3,Lh2,Lh6 3. Sxc8#,Dxf6#
2. ... Lg3 3. Sxc8#,Dxg3#,Dxf6#
2. ... Lg5,Le5 3. Sxc8#
2. ... Txa4 3. Sxc8#,Dxf6#
2. ... Ta8 3. Dxf6#,Dxf4#
2. ... d4 3. Dxf6#
2. ... c5 3. Dxf6#
1. ... Txa4 2. Sd3 Le5 3. Sxc8#
2. ... Ta8 3. Dxf6#
2. ... Txh4 3. Sxc8#
2. ... Te4 3. Sxc8#
2. ... d4 3. Dxf6#
2. ... c5 3. Dxf6#
1. ... Ta8 2. Dd4 c5 3. Dxf6#,Dxd5#
2. ... Txa4 3. Sxc8#
Co-Dual 2. Sc4+ dxc4 3. Dd4#
2. ... Kc5 3. Sd3#
1. ... Ta6 2. Sd3 Le5 3. Sxc8#
2. ... d4 3. Dxf6#,Dxd4#
2. ... Ta8 3. Dxf6#
2. ... Txb6 3. Dxf6#
2. ... c5 3. Dh4xf6#
Co-Dual 2. Sc4+ dxc4 3. Dd4#
2. ... Kc5 3. Sd3#
1. ... Tb5 2. Sd3 Le5 3. Sxc8#
2. ... Txb6 3. Dxf6#
2. ... d4 3. Dxf6#
2. ... c5 3. Dxf6#
1. ... d4 2. Dxd4+ Td5 3. Sc4#,Sxc8#
1. ... Kc5 2. Db4+ Kxb4 3. Sd3#
1. ... Ke5 2. Sd3+ Kd6 3. Sxc8#,Dxf6#
2. ... Kxf5 3. Dg4#
play all play one stop play next play all
Einsendung zum Kockelkorn-Gedenk-Turnier zum 60. Stiftungsfest des Kölner Schachklubs;
zum Autor heißt es in der 'Rheinischen Volkswacht': Pfarrer W. Bublitz (Neunhausen)
Henrik Juel: 8 black pawns, none of which is [Ph7] (2023-03-17)
comment
Keywords: Illegal position
Genre: 3#
FEN: 2bK4/1p1p1p1Q/1Npk1p2/r2p1P2/P7/p1p4P/2P4b/4N1n1
Input: Mario Richter, 2023-03-17
Last update: Mario Richter, 2023-03-17 more...
20 - P1410150
H. Lange
12 Neue Woche (Köln) 22/09/1935
P1410150
(4+13)
#3
1. Dd2? Ta1!
1. Txd7? Th8!
1. Td4? Ta1!

1. Dh1! droht 2. Dxb7#
1. ... Sf3 2. Td4 Ta1 3. Dxa1#
2. ... Sxd4 3. Dxb7#
1. ... Lf3 2. Txd7 Th8 3. Dxh8#
play all play one stop play next play all
illegale Stellung: 8 sBB + sUW-Lh5
im Diagramm sBd2 statt d3, Korrektur 13.10.1935
Henrik Juel: C+ Popeye 4.61 (but illegal position) (2023-06-05)
comment
Keywords: Illegal position
Genre: 3#
FEN: k7/1pKp2p1/1B1Rpp1r/7b/8/1p1p4/2p4Q/2r3n1
Input: Mario Richter, 2023-06-05
Last update: Mario Richter, 2023-06-05 more...
21 - P1411328
Phani Bushan
SS050 The Hopper Magazine I02 25/06/2022
P1411328
(2+4) C+
H#2 Lions (no wK)
(2 solutions)
1) 1. Ta5 LIa3 2. LIb8 Txa7#
2) 1. LIb8 Th7 2. Ta5 LIh8#
play all play one stop play next play all
more ...
comment
Keywords: Illegal position (no wK)
Pieces: dr = Lion (LI)
Genre: h#, Fairies
Computer test: C+, popeye 4.87
FEN: k7/bR6/8/5r2/8/1*1q5*1Q/8/8
Input: A.Buchanan, 2023-07-27
Last update: A.Buchanan, 2023-07-28 more...
22 - P1411330
Vlaicu Crisan
SS056 The Hopper Magazine I02 25/06/2022
P1411330
(1+4) C+
ser-H#8 (3 solutions)
Grasshoppers, No wK
1) 1. Kc4 2. Gb3 3. Kc3 4. Gb2 5. Kc2 6. Kb1 7. Ka1 8. Gb1 Ta8#
2) 1. Gc3 2. Ke3 3. Kf3 4. Gg3 5. Kg2 6. Kh1 7. Gg2 8. Gg1 Th8#
3) 1. Ke3 2. Kf3 3. Gf2 4. Kg3 5. Gg2 6. Kh2 7. Kh1 8. Gh2 Tb1#
play all play one stop play next play all
more ...
comment
Keywords: Illegal position (no wK)
Pieces: du = Grasshopper (G)
Genre: Fairies
Computer test: C+, popeye 4.87
FEN: 1R4*2q1/8/5*2q2/8/3kp3/8/8/8
Input: A.Buchanan, 2023-07-27
Last update: A.Buchanan, 2023-07-28 more...
23 - P1412025
Fadil Abdurahmanovic
Eckart Kummer

10049 feenschach 181 04-06/2010
P1412025
(1+14)
h#6
0.1.1...
1. ... Dxd5 2. b5 Dxc4 3. Kd7 De4 4. Kd6 Dxf5 5. Kd5 Dxe5+ 6. Kc4 De4#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2023-08-29)
Henrik Juel: No white King
Round trip by one white Queen only (2023-08-29)
comment
Keywords: Round Trip (D-3 2-fach), Remote selfblock, Model mate, Kniest Theme (2-fach), Illegal position (no wK)
Genre: h#
FEN: 4k3/4n3/1pp1b3/2pnbp2/2p1Qpq1/1pp5/8/8
Input: Felber, Volker, 2023-08-29
Last update: A.Buchanan, 2023-12-11 more...
24 - P1412979
Fritz Hofmann
5684 Deutsche Schachzeitung , p. 349, 11/1884
P1412979
(11+11) C+
#2
1. Dh3 Sc4 2. Lf3#
1. ... Kc6 2. d5#
play all play one stop play next play all
Henrik Juel: Position is illegal, because seven captures by black pawns are needed, while only five white men are missing (2023-10-17)
comment
Keywords: Illegal position
Genre: 2#
Computer test: Gustav 4.1d
FEN: 3n4/1p1P1p2/pP1p1Pp1/n2k2P1/N2P2Q1/1p2p1P1/1p2B3/1K1R4
Input: Felber, Volker, 2023-10-17
Last update: Felber, Volker, 2023-10-17 more...
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