Die Schwalbe

25 problem(s) found in 3937 milliseconds (displaying 25 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='Illegale Stellung'] [download as LaTeX]

1 - P1004380
Bror Larsson
Tidskrift för Schack 1953
P1004380
(8+0)
Auf welchen Feldern darf der sK nicht stehen, da die Stellung dann illegal wäre?
Es sind die 12 Felder a2,a3,a4,a6,d2,d3,e2,f2,h2,h3,h5,h6.
Auf Feld f3 steht der schwarze König legal weil das Doppelschach
Se2-g1 möglich wäre.
play all play one stop play next play all

Duplicate Diagram: P1386681

t/One-Liner 8-feldrig a1h1
Adrian Storisteanu: And not to be missed, P0007560 (wK vs the black home-based officers)... (2021-05-07)
comment
Keywords: Add pieces, Illegal position, Oneliner (8-feldrig a1h1)
Genre: Retro
FEN: 8/8/8/8/8/8/8/RNBQKBNR
Reprints: feenschach (46), p. 81, 04-06/1979
O4 Problemkiste 06/1999
Input: Gerd Wilts, 2003-01-10
Last update: Erich Bartel, 2011-08-02 more...
2 - P1007696
Rolf Wiehagen
9000 Die Schwalbe 155 10/1995
P1007696
(1+9) C+
h#7
0.1...
Illegal position
(R. Wiehagen). AGr: "Sicherlich ein Rekord - der Jubiläums-Nr. 9000 angepaßt! Aber die lange 5er-Reihe ist doch sehr verräterisch. Die Konstruktion war sicherlich wieder schwerer als die Lösung." Das ist leider häufig so... "Für einen aufmerksamen Schwalbeleser (siehe Artikel von N. Geissler itshape In der Kürze liegt die Würze / Die Schwalbe 155, 10/1995 S. 176ff) kein Problem. Gut gemacht." (CG) Und "so schön wie die Lösung sind auch die NL-Versuche." (ABe) 1.- T:b5 2.c2 T:c5 3.c1=T T:d5 4.Tc7 T:e5 5.Tg7 Tf5 6.Se5 Tg5 7.Sg6 Th5#. RJB: "Horizontale Brettüberquerung a5-h5 des weißen glq Zeitlupen grq-Turms, der sich in 7 Schritten seinem Zielfeld nähert und unterwegs störende schw. Steine eliminiert." "Ein charmanter Gag" (HJä) - "der weiße Turm frißt sich durch den schwarzen Schokoladenhaufen zum Matt." (WoW) MS: "Der wT frißt sich in Minischritten, jedoch in Rekordmanier von West nach Ost durch!" (Der Autor auf dem langen Heimweg.) Aber, so meint HHS: "Nur Sparsamkeitsfanatiker können Gefallen finden an diesem Extrakt der Politik der kleinen Schritte. Wenn diese nicht strategisch, sondern nur mechanisch begründet wird, dann ist die TASK-Forderung zwar erfüllt, aber der Löser gelangweilt." 5P/10L
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ohne wK
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comment
Keywords: Illegal position (nowk)
Genre: h#
Computer test: C+ Alybadix
FEN: 6b1/7k/8/Rppqpp2/6n1/2p5/8/8
Input: Gerd Wilts, 2003-06-29
Last update: A.Buchanan, 2021-04-18 more...
3 - P1061897
John Augustus Miles
? 1877
P1061897
(10+13)
#4

BS Problemid: 46982
Authors: Miles, JA
Sources:
Years: 1877
Paulo Roque: Illegal position (black bishop h8 + black pawn g7) (2010-09-04)
Henrik Juel: 1.Txh8 thr. 2.Kxg7#
Ruined by duals, e.g.
1... Tg5 2.Dxa4 De3 3.f8=DT+,Da5+,fxe3
.. 2... b4 3.Dxa7,Da5+
The only correct variation seems to be
1.Txh8 Tg5 2.Dxa4 bxa4 3.La5+ Txa5 4.Kxg7# (2021-01-04)
comment
Keywords: Brian Stephenson Collection (46982), Illegal position
Genre: n#
FEN: 3k2Kb/pB1p1Pp1/2pP4/1pr5/r2Q3R/Pq4Pn/2b2P2/3nB3
Input: Brian Stephenson, 2004-08-12
Last update: James Malcom, 2021-01-03 more...
4 - P1102309
Yaakov Mintz
(15) feenschach 68, p. 321, 12/1983
P1102309
(2+1) C+
h#4*
Circe
1. Kd3?
*) 1. ... Sb3 2. Kxb3[+wSb1] La1 3. Ka2 Sc3+ 4. Kxa1[+wLc1] Lb2#
1. Kxc3[+wLc1] Sb3 2. Kxb3[+wSb1] La3 3. Ka2 Sc3+ 4. Ka1 Lb2#
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SCHRECKE: C+, popeye 4.85 (2021-02-19)
comment
Keywords: Circe, Aristocrat, Miniature, Illegal position
Genre: h#, Fairies
FEN: 8/8/8/8/2k5/2B5/8/N7
Input: YM, 2010-04-01
Last update: James Malcom, 2021-02-19 more...
5 - P1113604
Erich Bartel
Jugendschach (46) 06/01/1985
P1113604
(6+3) cooked
h#2*
0.1.1.1
* Null-Satz!
1. ... Lb6 2. e5 Lc5#
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Cook: 1. ... Ka7,Ka8+ 2. Kxc7 b8=D#
A.Buchanan: Can probably be fixed by shunting everything to the left by 1 file. Alternatively, if one of the cooks can be suppressed, the other could represent a second solution. (2018-04-29)
Erich Bartel: keine cooks,
siehie dazu in Jugendschach (46) 6.01.1985, S.66-67,72,73
Theodor Steudel:Das Thema Null bei der Mattforderung,
Elmar Bartel & Erich Bartel:Nachbetrachtungen zum Thema Null,
Hans Gruber:Noch ein Wort zum Thema Null (2018-04-29)
A.Buchanan: OK danke, aber können Sie bitte hier schreiben, warum Weiss kann nicht 1... Ka7/8+ spielen. (2018-04-30)
A.Buchanan: Not reasonable to ask people to refer to 3 articles from a minor journal 33 years ago. Erich can you please give a simple explanation (English or German) for why 1... Ka7/8+ aren't cooks. Note that Thema Null is not a fairy condition but a theme: so what's going on? (2018-11-23)
A.Buchanan: By the way: I REALLY LIKE Thema Null. It is a wonderful theme. But I need clarity how it is intended to operate here. This was the only one of the Lese Majeste problems solved by Popeye v4.81 which was cooked. (2018-11-23)
A.Buchanan: Failing an explanation, I've marked this as cooked, following both Popeye & Jacobi (2021-05-11)
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comment
Keywords: Thema Null, Lese Majeste, Illegal position, Fata Morgana
Genre: h#
Computer test: Popeye v4.81 & Jacobi v0.6.1
FEN: 1K6/1PBbp3/3k4/3P4/1P2P3/8/8/8
Input: Erich Bartel, 2010-08-26
Last update: A.Buchanan, 2021-05-11 more...
6 - P1227253
Andrew Buchanan
N1QCi) Economy Records in Add Unit(s) Problems , p. 4, 06/06/2011
P1227253
(5+5)
Add one unit.
+wDa2
R: Tb2-b1++
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Impossible treble check, so blocking unit needed on b2 or a2. If the former, then Bl just played R: 1. axb1=T++ & Wh only has a prior move if b2 unit is wS, but then illegal check to sK. So the unit must be added on a2. Last move was not b2-b1=R++ because of prior illegal check from sBb2. So it must be Tb2-b1++ (a capture implies retro pat). So what's on a2? Prior White move was not Kb1-a1, or the check from Tb2 is impossible. So it was L/D allowing L/Db1*a2. If the former, then there is a core cage comprising wKa1 wLb1 wBb3c2d2 sTb2 which can never unlock. So can only be +wDa2, with no problem for wD eventually sliding out.
Economy record for an "Add one unit" problem, type C, in which the unit to add is a Queen.
See http://abrobecker.free.fr/chess/addunits.pdf (2011-12-16)
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comment
Keywords: Type C, Add pieces, Economy record, Illegal position
Genre: Retro
FEN: 8/8/8/8/1P6/rPb5/2PP4/Krnk4
Input: Alain Brobecker, 2011-12-16
Last update: A.Buchanan, 2021-01-18 more...
7 - P1227257
Andrew Buchanan
N18Ci) Economy Records in Add Unit(s) Problems , p. 6, 23/07/2011
P1227257
(9+5)
Add 18 units.
+wBa4b2d2f2h4 +wLc1 +wDc3 +sBa5b6c7d7e7f3g7h5 +sLf8 +sTc4 +sDg3
R: S-d4
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All pieces will be on board so pawns remain on their original files.
+BPc7d7e7g7 & +WPd2, implying +BBf8. Since BBd5 is out we've +BPb6 +WPb2, entailing +WBc1.
WKb3 is attacked by WNd4, so we need 4 units on the lines to the Ks and one of those lines is blocked by P, so +BPf3 +WPf2. Since all Rs must be out, we have +WPa4h4 +BPa5h5. Lastly, the remaining line interceptions are +BRc4 +WQc3 +BQg3.
Record of the highest number of units to add so that a position becomes legal (Type C, number of units specified).
See http://abrobecker.free.fr/chess/addunits.pdf (2011-12-16)
Henrik Juel: Good problem with well-explained solution (2021-01-17)
A.Buchanan: Thanks Henrik :) (2021-01-18)
comment
Keywords: Type C, Add pieces, Economy record, Illegal position
Genre: Retro
FEN: 8/8/2PNP1P1/1N1b4/1R1n2k1/1K1r4/6Rn/3B4
Input: Alain Brobecker, 2011-12-16
Last update: A.Buchanan, 2021-01-18 more...
8 - P1262746
Paul S. Valois
S1013 The Problemist 03/1985
nach F. Anderson
P1262746
(13+14) cooked
s#2
1. Lg4! droht 2. Dxa6+ Lb7#
1. ... Da1 2. Sxd4+ Lf5#
1. ... Da5 2. Sxc5+ Lf5#
1. ... Sb4 2. Sxd8+ Lf5#
1. ... Lxf8 2. Sxf8+ Lf5#
1. ... Sxc7 2. Sxc7+ Lf5#
2. Lxc7+ Lxa8#
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vgl. Anderson (Springaren 1951)
Cook: Dual 1. ... Sxc7 2. Sxc7+, 2. Lxc7+
Henrik Juel: dual 1... Sxc7 2.Sxc7+,Lxc7+ (2021-01-04)
comment
Keywords: differenzierte Batterieabzüge, Illegal position, selfpinning
Genre: s#
FEN: RBkrRNn1/Q1P1b1P1/np2N1p1/2p1KBp1/2Ppbp2/5P2/2P1r3/4q3
Input: Frank Müller, 2013-02-17
Last update: Marcin Banaszek, 2021-01-07 more...
9 - P1298074
Jacques Rotenberg
Problemiste 2012
1st prize
P1298074
(10+16)
#11
1. Sfxe7+! exd5+ 2. Sxd5+ Sef6+,Shf6+ 3. Sdxf6+ d5+ 4. Sxd5+ Sf6+ 5. Sdxf6+ d5+ 6. Sxd5+ Te7+ 7. Sdxe7+ Ld5+ 8. Sxd5+ Te7+ 9. Sdxe7+ f5+ 10. Sxf5+ De7+ 11. Sfxe7#
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correction of P1298046
Henrik Juel: 21 consecutive checks; unfortunately, the position is illegal.
White never captured, while black pawns captured six times by axbxcxd, b7xc6, c7xd6, and h7xg6; but [Pf2] could not have been captured.
Nowadays it is rare to see an illegal prize winner, so the diagram may be incorrect (Pg2?) (2015-02-25)
Henrik Juel: Now I see that Jacques, in his comment to P1298046, gave this position, so my last sentence does not apply (2015-02-25)
Henrik Juel: The illegality is even 'worse' than I first thought, because [Pe2] could not have been captured either (2015-02-27)
James Malcom: I think it would be nice to have a legal version of this record. To do this, I propose we shorten the solution until a legal position is reached.

A #9 with 33B2N1/qrrp1ppn/1Ppp1np1/2QN2k1/3PKR2/8/b2p2P1/8 seems legal, no? (2021-02-06)
Anton Baumann: störender Dual in der Lösung: ... 7.Sde7+ f5+ 8.Sxf5+ Te7+ 9.Dxe7+,Lxe7+,Sxe7+ ...
Die Stellung wird legal mit schwarzer Umwandlungsfigur: d2=sT! Aber es bleibt der Dual in der Lösung.
Mögliche legale Stellung, ohne Dual in der Lösung: a7=sT, b7=sD, -sBc6, wBb6 nach c6 (10+15) #10
Lösung: 1.Sfe7+ exd5+ ... 7.Sde7+ Ld5+ 8.Dxd5+ f5+ 9.Sxf5+ De7+ 10.Sxe7# (2021-02-11)
comment
Keywords: Illegal position, Consecutive checks (21), Checking key, Construction task, Construction record, Move Length Record
Genre: n#
FEN: 3Bn1N1/qrrpbppn/1Pppp1p1/2QR1Nk1/3PKR2/8/b2p2P1/8
Input: A.Buchanan, 2015-02-25
Last update: James Malcom, 2021-02-07 more...
10 - P1299312
Ottó Titusz Bláthy
148f Fata Morgana 1922
P1299312
(4+16) cooked
s#20*
* 1. ... Dg8#
1. Te8 Dg8+ 2. Ke7 Kh7 3. Txg8 Kxg8 4. Ke8 Kh7 5. Kf8 Kh8 6. Kf7 Kh7 7. e7 Kh8 8. e8=D+ Kh7 9. De7 Kh8 10. Kxg6 Kg8 11. Kh5 g6+ 12. Kxh6 Kh8
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Anton Baumann: kürzer: 5.Kf7! Kh8 6.Kxg6 Kg8 7.e7 Kh8 8.Kh5 g6+! 9.Kxh6 Kg8 10.Kxg6 Kh8 11.Kxg5 Kg7 12.e8=D Kh7 13.Df7+ Kh8 14.De7 Kg8 15.Kf4,Kh4 Kh8 16.Kxg3 Kg8 17.Kxh2 g3+ 18.Kxg1 Kh8 19.Df7 h2# (17. .. Kh8 18.Df7 g3 19.Kxg1 h2#) (2020-11-30)
comment
Keywords: Illegal position
Genre: s#
FEN: 5K1k/4R1pq/4P1pb/6p1/6p1/5prp/4prpn/4Qbn1
Input: Frank Müller, 2015-03-15
Last update: Marcin Banaszek, 2020-11-30 more...
11 - P1299313
Ottó Titusz Bláthy
148g Fata Morgana 1922
P1299313
(4+16)
s#29*
* 1. ... Dg8#
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Anton Baumann: Autorabsicht unbekannt; Lösung in 26 Zügen:
1.Te8 Dg8+ 2.Ke7 Kh7 3.Txg8+ Kxg8 4.Ke8 Kh7 5.Kf7 Kh8 6.Kxg6 Kg8 7.e7 Kh8 8.Kh5 g6+! 9.Kxh6 Kg8 10.Kxg6 Kh8 11.Kf5 Kg7 12.e8=D Kh6 13.Ke4 Kg7 14.Kd3 Kh6 15.Kd2 Kh7 16.Db1+ Kh6 17.Ke1 Kg7 18.Da1+ Kh6 19.Deh8+ Kg6 20.Dag7+ Kf5 21.De8 Kf4 22.Db5 Ke3 23.Da7 Kf4 24.Dxf2 Kf4 25.Def3+ Kxe3 26.Dc4 f2# (mit Dualen) (2020-12-07)
comment
Keywords: Illegal position, Obtrusive material
Genre: s#
FEN: 5K1k/4R1pq/4P1pb/6p1/6p1/5prb/4prpn/4Qbn1
Input: Frank Müller, 2015-03-15
Last update: Frank Müller, 2015-03-15 more...
12 - P1299315
Ottó Titusz Bláthy
148i Fata Morgana 1922
P1299315
(5+15)
s#47*
* 1. ... Dg8#
1. Te8 Dg8+ 2. Ke7 Kh7 3. Txg8 Kxg8 4. Ke8 Kh7 5. Kf8 Kh8 6. Kf7 Kh7 7. e7 Kh8 8. e8=T+ Kh7 9. Te6 Kh8 10. Td6 Kh7 11. Txg6 Kh8 12. Td6 g6 13. Td8+
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Anton Baumann: kürzer: ... 5.Kf7! Kh8 6.Kxg6 Kg8 7.e7 Kh8 8.Kh5 g6+! 9.Kxh6 Kg8 10.Kxg6 Kh8 11.Kf5 Kg7 12.e8=D Kh6 13.Ke4 Kg7 14.Kd3 Kf6 15.Kd2 Kg7 16.Da1+ Kh6 17.Da6+ Kg7 18.Db7+ Kh6 19.Dh8+ Kg6 20.Ke1 Kf5 21.Dc6 Kf4 22.Dc5 Ke4 23.Db8 Kd3 24.Dxg3 Ke4 25.Dgd6 g3 26.Dc2+ Ke3 27.Lxf2 gxf2# (mit vielen Dualen) (2020-12-09)
comment
Keywords: Illegal position
Genre: s#
FEN: 5K1k/4R1pq/4P1pb/6p1/6p1/5prp/4prpn/4QbB1
Input: Frank Müller, 2015-03-15
Last update: Frank Müller, 2015-03-15 more...
13 - P1301071
Ljubomir Ugren
F3085 The Problemist 11/2013
P1301071
(9+12)
ser-h#35
1. Da2xb1 2. Db1-a2 3. Da2xa3 4. Da3-c5 5. Ta4-b4 6. Ta5-a2 7. Ka6-a5 8. Ka5-a4 9. Ka4-a3 10. Tb4-a4 11. Ta4-a6 12. Ka3-a4 13. Ka4-a5 14. Ta2-a4 15. Ta4-b4 16. Ka5-a4 17. Ka4-a3 18. Ka3-a2 19. Ka2-b1 20. Ta6-a2 21. a7-a5 22. a5-a4 23. a4-a3 24. Tb4-a4 25. Ta4-a8 26. Ta8-d8 27. Td8xd2 28. Kb1xc1 29. Kc1-d1 30. Kd1-e2 31. Ke2-f3 32. Kf3-g4 33. Kg4-h5 34. Kh5-h6 35. Dc5-h5 g7-g8=S#
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Henrik Juel: The position is illegal, as black pawns have captured nine times, but only seven white men are missing.
What is the intended solution? (2015-04-07)
Mario Richter: I do not know the intended solution, but the following line of play does the job:
1. Qa2xb1 2. Qb1-a2 3. Qa2xa3 4. Qa3-c5 5. Ra4-b4 6. Ra5-a2 7. Ka6-a5 8. Ka5-a4 9. Ka4-a3 10. Rb4-a4 11. Ra4-a6 12. Ka3-a4 13. Ka4-a5 14. Ra2-a4 15. Ra4-b4 16. Ka5-a4 17. Ka4-a3 18. Ka3-a2 19. Ka2-b1 20. Ra6-a2 21. Pa7-a5 22. Pa5-a4 23. Pa4-a3 24. Rb4-a4 25. Ra4-a8 26. Ra8-d8 27. Rd8xd2 28. Kb1xc1 29. Kc1-d1 30. Kd1-e2 31. Ke2-f3 32. Kf3-g4 33. Kg4-h5 34. Kh5-h6 35. Qc5-h5 Pg7-g8=N# (2015-04-08)
Henrik Juel: Thanks, Mario, for the nice solution, which certainly looks intended (2015-04-08)
Anton Baumann: C+ Alybadix (2020-12-01)
A.Buchanan: Suppose remove wBf6 and wLb1, and shift wSe4 to e6, with sDa2 to b1. Does that work as ser-h#34? (2020-12-02)
Anton Baumann: wSe4 nach e6?? 1.Tb4 Sc7#
Wenn 2 w Steine reduzieren, dann diejenigen welche ohnehin geschlagen werden:
zB: -wLb1, -wBa3, sTa4 nach b4, sDa2 nach a4 (7+12) serh#34: 1.Da3 2.Tba4 3.Dc5 4.Tb4 ... (2020-12-03)
A.Buchanan: Haha Anton I should have spotted that. Also wSe4 stops sDb1-f5-c5, which makes me think about sDb1 sTa2a3 sKa4 (and the two white units removed, of course). Is that ser-h#38? (2020-12-03)
Anton Baumann: Auch so ser-h#34: 1.Ka5 3.Tb4 5.Ka3 7.Ta6 9.Ka5 10.Ta4 13.Dc5 14.Tb4 18.Kb1 ... (2020-12-04)
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comment
Keywords: Series mover, Illegal position
Genre: Fairies
FEN: 5N2/pp4P1/kp3P2/rp6/r1p1N3/PpK5/qn1Q4/bBB5
Input: Frank Müller, 2015-04-07
Last update: A.Buchanan, 2020-12-02 more...
14 - P1302032
Peter Güssow

P1302032
(11+16) cooked
#22
1. Td1 hxg4 2. Se2+ Kg2 3. De1 Kf3 4. Sg1+ Ke4 5. Sh3 exf4 6. f3+ gxf3 7. Sf2+ Ke5 8. Sxd3+ Ke4 9. Sf2+ Ke5 10. Sf5+ Sxh8 11. Sg4+ Ke4 12. Txd4+ cxd4 13. Dxb1+ d3 14. Sxd6+ exd6 15. Db4+ d4 16. Lb7+ Txb7 17. Te5+ dxe5 18. Dxb7+ d5 19. Dh7+ Sg6 20. Dxg6+ Tf5 21. Dxf5 exf5 22. Sf6#
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Cook: Duale im 8. und 13. Zug
Diese Aufgabe stand ursprünglich auf der Webseite des Autors, welche nicht mehr auffindbar ist.
Die Aufgabe hat aber auf Youtube überlebt:

https://www.youtube.com/watch?v=mqKThPSX3PY
Stefan Felber: Stellung illegal! (2015-04-27)
SCHRECKE: Wer kennt die zuglängste Aufgabe mit dem "erstickten" Matt
in der Brettmitte mit legalen Mitteln ? (2015-04-27)
James Malcom: At 16 moves, P1236204 seems to be the known record. (2021-01-15)
comment
Keywords: Obtrusive material, Illegal position
Genre: n#
FEN: 1rB2r1B/3pp1N1/3qp1n1/QRppp1Kp/3b1PR1/3bp3/3R1P2/1n4Nk
Reprints: YouTube 16/12/2014
Input: Olaf Jenkner, 2015-04-26
Last update: Frank Müller, 2015-04-27 more...
15 - P1305230
Thierry Le Gleuher
1 RIFACE 2015
P1305230
(11+1)
Ajouter des pièces.
+wSb2d2 +wLc4
R: 1. Dd1-c2+ Kc2-c3 etc
play all play one stop play next play all
A.Buchanan: How about wLa1 instead? (2020-10-06)
Henrik Juel: Yes, that would improve the economy slightly (2020-10-06)
Ladislav Packa: wBa1 is illegal... (2020-10-07)
A.Buchanan: Hi Ladislav why is wLa1 illegal, please? That was essentially my question before (2020-10-07)
Mario Richter: wLa1 instead of wDa1 is of course legal too: one of the dark-squared wBishops unpromotes on h8, one wQueen on g8. Black pawns g7+h7 let the wPawns g2+h2 pass by cross-capturing the 2 original wRooks. (2020-10-07)
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comment
Keywords: Add pieces, Illegal position
Genre: Retro
FEN: 8/P7/P7/P1Q5/P3K3/P1k5/P1Q5/Q3B3
Input: A.Buchanan, 2015-07-08
Last update: A.Buchanan, 2020-10-07 more...
16 - P1315337
Jozsef Pogats
11591 Schach-Echo , p. 40, 01/1991
P1315337
(10+9) C+
h#25
0.1...
1. ... h4 2. Lg1 Kxg1 3. Kf7 Kh1 4. Ke8 Kg1 5. Kd8 Kh1 6. Kc8 Kg1 7. Kb8 Kh1 8. Ka7 Kg1 9. Ka6 Kh1 10. Ka5 Kg1 11. Kb4 Kh1 12. Kxc4 Kg1 13. Kxc5 Kh1 14. Kxc6 Kg1 15. Kd7 Kh1 16. c5 Kg1 17. c4 Kh1 18. c3 Kg1 19. c2 Kh1 20. c1=S Kg1 21. Sxe2+ Kh1 22. Sf4 Lc4 23. Sg6 hxg6 24. Ke8 gxh7 25. Kf8 h8=D#
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SE schreibt in der LB:

'Die Stellung ist illegal, da die schwarzen Bauernschlagfälle mit den fehlenden weißen Steinen nicht übereinstimmen, vor allem wegen des weißen h-Turmes. Zur Herstellung der Legalität muß man wohl auf den ersten Halbzug verzichten und (mit wBh4) auf ein h#24 zurückstecken?'.

ferner

'Vom Autor liegt noch eine ähnliche, allerdings um zwei Züge kürzere Aufgabe vor...' (=P1315338)
Henrik Juel: The position is illegal
because Black would need six pawn captures to reach his pawn position, but [Th1] was captured in its corner by a black officer, leaving only five white men for capture by black pawns
So (wBh5) in Keywords makes little sense (2016-01-12)
James Malcom: Why was this labeled as cooked? An illegal position does not automatically make a problem incorrect. I've changed it to C+. (2020-11-11)
A.Buchanan: Yes James only for a retro might I mark an illegal problem as “cooked”. Even then that’s not really the right term. But here simply fix by pushing wBh3c4 to h4c3. The initial White move is still forced, so no change to soundness but the position is legal. (2020-11-12)
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comment
Keywords: Illegal position
Genre: h#
Computer test: O. Jenkner: Gustav 4.1 d
FEN: 8/2p1p2p/2P1k2p/2P1p2P/2P1P3/4p1pP/4P1Pb/5B1K
Input: Felber, Volker, 2016-01-12
Last update: Olaf Jenkner, 2020-11-12 more...
17 - P1360528
Petre Stojoski
The Macedonian Problemist 57a 09-12/2018
Zoran Gavrilovski 50 JT Abt. H#>2
1. ehrende Erwähnung
PR Hans Gruber
P1360528
(2+13) C+
h#5
1. Se5-c4+ Kb2-c1 2. Kd6-e7 La1xd4 3. Lh2-c7 Ld4-g7 4. Sc4-e5+ Kc1-b2 5. Ke7-d6 Lg7-f8#
play all play one stop play next play all
Stefan Felber: Illegale Bauernstellung! (2019-02-02)
Viktoras Paliulionis: Possible correction: bBd7.
Also, the BQ can be replaced with a BR. (2020-10-08)
comment
Keywords: Illegal position, Checking key, Minimal, Model mate, Klasinc theme (K-L, s-L, s-l, k-l), Switchback (Kks), Selfblock, Line closing, Line closing, Bivalve
Genre: h#
Computer test: Popeye 4.67
FEN: 8/3p4/2qkp3/3pn3/pp1p4/1p1r4/pK5b/B7
Input: Marcin Banaszek, 2019-02-02
Last update: Gunter Jordan, 2019-05-16 more...
18 - P1380065
Hermann Weissauer
C Die Schwalbe 35, p. 382, 10/1975
P1380065
(8+13) C+
#3
1. Tf8-f5! droht 2. Sc5-a4+,S~+ Kb5xa4 3. Te5xa5#
1. ... Lh4-e1 2. Te5-e4 droht 3. Ld3xc4#
2. ... a5-a4 3. Sc5-e6#
play all play one stop play next play all
innerhalb eines Artikels "Batteriewechsel - ein interessantes Thema?" (II. Teil) von H. Weissauer
Stefan Felber: Stellung illegal! (2020-09-20)
comment
Keywords: Illegal position (8 sBB+UW-Lh4)
Genre: 3#
Computer test: Popeye 4.83
FEN: 5R2/1K2p1p1/6P1/pkN1R1Pq/2r2ppb/Bp1Bp3/1p6/6r1
Reprints: Rochade Europa , p. 41, 10/1995
Input: Marcin Banaszek, 2020-09-19
Last update: Mario Richter, 2020-09-20 more...
19 - P1382870
Andrew Buchanan
1 The Problemist Supplement 169, p. 120, 11/2020
P1382870
(1+4) C+
h#6.5
Illegal position
1. ... f4 2. Sf6 f5 3. Sh5 f6 4. Sg7 fxg7 5. Kd8! g8=D+ 6. Kd7 Dg4+ 7. Ke8 Dc8#
play all play one stop play next play all
A.Buchanan: These are not part of the TPS solving competition: the solutions are given in the same issue. But the automatic PDB problem blocker stops them from being commented on. As a work-around for now, I have set the year to 1020 (famous of course as the year Byzantine troops under Catepan Basil Boioannes (supported by his ally Prince Pandulf IV) captured the fortress of Troia). (2020-12-12)
Henrik Juel: Thanks for the enlightenment, Andrew, and for the history lesson
Solution
1... f4 2.Sf6 f5 3.Sh5 f6 4.Sg7 fxg7 5.Kd8! g8=D+ 6.Kd7 Dg4+ 7.Ke8 Dc8# (2020-12-12)
Henrik Juel: Adding wKe1 for legality while maintaining homebase causes many cooks, e.g.
1...f2-f4 2.e7-e5 f4*e5 3.Ke8-e7 e5-e6 4.Ke7-f6 e6*f7 5.Kf6-f5 Ke1-f2 6.Kf5-g4 f7*g8=Q+ 7.Kg4-h3 Qg8-g3# (2020-12-12)
A.Buchanan: Yes wK is just too dominant in these longer h#. But homebase is awesome constraint on design. There are some tremendous h# already, and much of their impact is because of homebase. (2020-12-12)
Olaf Jenkner: Now I see, homebase was the theme... (2020-12-12)
Olaf Jenkner: The king could easily stand at a1 without impact of correctness. (2020-12-12)
A.Buchanan: Yes thematic (2020-12-12)
more ...
comment
Keywords: Illegal position (nowk), Homebase (2), Minimal (super)
Genre: h#
Computer test: C+ Popeye 4.61
FEN: 4k1n1/4pp2/8/8/8/8/5P2/8
Input: A.Buchanan, 2020-12-11
Last update: A.Buchanan, 2021-05-08 more...
20 - P1382871
Andrew Buchanan
Geoff Foster

2 The Problemist Supplement 169, p. 120, 11/2020
P1382871
(1+4) C+
h#7
Illegal position
1. Sc6 e4 2. Sd8! e5 3. Sf7 e6 4. Kd8 exf7 5. Kc8! f8=D+ 6. Kc7 Df4+ 7. Kd8 Db8#
play all play one stop play next play all
more ...
comment
Keywords: Homebase (2), Illegal position (nowk), Minimal (super)
Genre: h#
Computer test: C+ Popeye 4.61
FEN: 1n2k3/3pp3/8/8/8/8/4P3/8
Input: A.Buchanan, 2020-12-11
Last update: A.Buchanan, 2021-05-08 more...
21 - P1382872
Andrew Buchanan
3 The Problemist Supplement 169, p. 120, 11/2020
P1382872
(2+3) C+
h#7
Illegal position
1. c5 Sd2 2. c4 Sb3 3. cxb3 c4 4. b2 c5 5. b1=T c6 6. Te1 (not 6.Tb7?) c7 7. Te7 c8=D#
play all play one stop play next play all
Out of about 90 examples, this is the only orthodox homebase h# with a rook sub-promotion.
more ...
comment
Keywords: Homebase (2), Illegal position (nowk)
Genre: h#
Computer test: C+ Popeye 4.61
FEN: 4k3/2p2p2/8/8/8/8/2P5/1N6
Input: A.Buchanan, 2020-12-11
Last update: A.Buchanan, 2021-05-08 more...
22 - P1382873
Andrew Buchanan
4 The Problemist Supplement 169, p. 120, 11/2020
P1382873
(1+5) C+
h#8
Illegal position
1. Lh3 gxh3 2. g5 h4 3. g4 h5 4. g3 h6 5. g2 h7 6. g1=D h8=D+ 7. Dg8 Dh3 8. Df7 Dc8#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61
This one is my favorite in the series
Why not add white king somewhere to make the position legal? (2020-12-11)
A.Buchanan: Thanks Henrik. There are now about 100 homebase h# compositions in PDB, following an article I wrote in TPS a couple of years ago, and the legal length limit seems to be about 6.0 moves. Since wK is very good at enabling cooks beyond that point, it's interesting and funny to see what happens if he is removed. The homebase criterion however is paramount, so I absolutely can't just stick wK somewhere else. If I remember properly, Geoff did find out-of-the-way places to stick wK for the other three compositions, but not for this one. As a retro enthusiast, obviously I love the fractal landscape of legal positions, but by the same token, I see nothing wrong with thematic illegality: illegality never prevents one from playing forwards if one is calm about it. And it opens the door to an otherwise inaccessible region of design space, with novel king-free mating patterns. Can anyone push the length further, or find any homebase h# with a bishop promotion? (2020-12-12)
Henrik Juel: Now I understand what is going on
I do not care much about Codex issues, but for some reason I dislike illegal positions for regular problems
Possibly this should be categorized as a fairy problem
Solution
1. Lh3 gxh3 2. g5 h4 3. g4 h5 4. g3 h6 5. g2 h7 6. g1=D h8=D+ 7. Dg8 Dh3 8. Df7 Dc8# (2020-12-12)
A.Buchanan: Thanks for you perspective, Henrik.
Surely some might consider white king as a fairy condition. As you implicitly point out while the *effect* is no white king, there can be multiple *justifications*, just one of which is the direct fairy condition (nowk). As a composer, I chose a different explanation: illegal position. These positions are exactly as illegal as a position with wPb1 & wBa1. In both situations, we can prove there is no sequence of legal moves from the initial game array (PAS). And in both situations we can simply play forward chess, with no issue. Obviously I love retrograde analysis, which has the fractal landscape of legal positions as its bedrock. But it's nice to look at the other side sometimes, and I find it odd that some other people are nervous about doing that.
The distinction between justification and effect wasn't clear to me until recently. Other examples are Bosma & Dummy Pawn. An instance of either may be a joke or a fairy problem. Dummy pawn might also be due to illegal position, or it might be a historical problem, or a contemporary problem set in a previous historical period (which would not make it fairy, it would just have an invalid timestamp).
You may consider threats and set play 20 times a day, but never worry about the legality of the positions in which those moves are playable. And that's because the laws extend smoothly to such illegal positions (except for certain corner cases, and even those can be worked out with a little trying). But even if you found that a threat was in a position from which White couldn't actually have the move, you wouldn't care. So in this area you accept illegality. Orthodox problems couldn't exist without the principle that the laws work happily in illegal positions. It's like mathematics & complex numbers.
The Codex is surprisingly astute about illegality. An illegal position does not prevent soundness: the only stated downside is it *might* not be acceptable to a tourney. The Codex also says that illegal and fairy positions do not normally support retrograde analysis. Although, these days fairy retro analysis exists. The implication in any case is that from the fairy position, illegality and fairy concepts are distinct.
For me, the position is just a node in a graph which happens to be inaccessible from the start node. It's horribly inefficient to have to invoke a specific fairy condition out of so many. Much cleaner and more satisfying to say, well we are in that inaccessible node, so let's play chess. (2020-12-12)
comment
Keywords: Homebase (2), Illegal position (nowk), Minimal (super)
Genre: h#
Computer test: C+ Popeye 4.61
FEN: 2b1k3/2p1p1p1/8/8/8/8/6P1/8
Input: A.Buchanan, 2020-12-11
Last update: A.Buchanan, 2021-05-08 more...
23 - P1389103
LilHamood
Chess Problems & Studies Discord Server 4/4/2021
12th Place
CP&S Discord Server Composition Tourney 0 {}
P1389103
(3+2)
Make a legal move (-:
Henrik Juel: maybe 1.e8=K (2021-04-30)
comment
Keywords: Joke, Minimal, Miniature, Illegal position
Genre: Retro
FEN: 8/4P3/8/5N2/8/8/2Q3b1/7k
Reprints: MatPlus.net Forum 4/4/2021
Input: A.Buchanan, 2021-04-30
Last update: A.Buchanan, 2021-04-30 more...
24 - P1389106
Ethan Donaghue
Chess Problems & Studies Discord Server 4/4/2021
15th Place
CP&S Discord Server Composition Tourney 0 {}
P1389106
(15+10)
"White to move and win (-:
Henrik Juel: 1.Da8# (2021-04-30)
comment
Keywords: Joke, Illegal position, Non-standard material (TTTLLdddddd)
Genre: Studies
FEN: 1k1q1q2/1pq3q1/1p6/2q3q1/3q1N2/5BBB/Q4PPP/RRB1RRKR
Reprints: MatPlus.net Forum 4/4/2021
Input: A.Buchanan, 2021-04-30
Last update: A.Buchanan, 2021-04-30 more...
25 - P1389165


P1389165
(10+1)
#6
1. Sb3!,Ta8+ Kxe7 2. Ta8,Sb3 Kxe6 3. Ta7 Kxe5 4. Ta6 Kxe4 5. Ta5 Kxe3 6. Te5#
play all play one stop play next play all
100 Classics of the Chessboard attributes the source as "MS 791 Casanatense Library. Rome"

"It is surprising to learn that this problem has a classic anticipation in the fifteenth century MS in the Casanatense Library in Rome (No. 7Sa). This uses the mediaeval-type piece, the Alfil, solely
for the purpose of guarding square f4, while the key move by the Knight simply guards d4. Otherwise the idea of the solution is identical to that in Shinkman's later version, but without the castling move."

Shinkman's (in)famous cooked #8: P1267725

https://timkr.home.xs4all.nl/chess2/diary_8.htm

Tim Krabbe wrote: "Some time ago (see The Kuwait immortal), I wrote about the Shinkman classic in the diagram on the left. The solution is: 1.O-O-O Kxa7 2.Rd8 Kxa6 3.Rd7 Kxa5 4.Rd6 Kxa4 5.Rd5 Kxa3 6.Rd4 Kxa2 7.Rd3 Ka1 8.Ra3 mate After 1.Kd2, it is also mate in 8.

Later, Harold van der Heijden and Bader Al-Hajiri pointed me to a book 100 Classics of the Chessboard by Dickins and Ebert (Cadogan, 1995) which gives an amazing 15th century anticipation of Shinkman's problem. See the diagram on the right. (Note: the piece on h2 is the old Arabian Alfil.) The Alfil is a 2,2 leaper, and the Ah2 therefore only guards f4. The solution is: 1.Nb3 Kxe7 2.Ra8 Kxe6 3.Ra7 Kxe5 4.Ra6 Kxe4 5.Ra5 Kxe3 6.Re5 mate.

PS: As Rik van der Heiden and Bader al-Hajiri remarked, White can also play 1.Ra8+ and 2.Nb3. Van der Heiden also points to 1.Nb3 Kxe7 2.Nd4 and mate in time. But in those days, dual solutions didn't matter. Also, obviously, the Alfil could never have reached h2 from its starting square c1. Al-Hajiri suggests replacing it by a Pg3."
James Malcom: While this is indeed a very early predecessor to P1267725, I seriously doubt that it can be called an "anticipation." (2021-05-02)
A.Buchanan: I agree James. "Anticipation" is a wounding thing, and the word is not to be bandied about indescriminately :-) Surely there is room for many numerous compositions with the brave chain of wPs reaching across the board, echoing the chain of composers building on one another's ideas over the centuries...
The pawn chain takes 9 captures to establish. No more captures are needed for wPb to promote to alfil on b8. f8 is the alternative promotion square. As you know, I think this kind of foolish promotion counting is fun, so therefore am happy to stick with ALh2. It would count as non-standard material, even though the normal complement of such Alfils is 0. Note that ALg3 would be illegal! There are 8 orbits for Alfils, and only 6 are achievable, even with promotion. (2021-05-02)
A.Buchanan: What kind of promotion was available in Persian/Arabic chess at the time is unclear to me. Although Western chess limited promotion to just a nebbish Ferz (see https://en.wikipedia.org/wiki/Rules_of_chess#History), Indian Shaturanga had other ideas: the default promotion rule I encountered when looking at this was to the type of piece that began on that column (bearing in mind that the black Ferz began on e8). Thus if Persian/Arabic chess borrowed from the Indian form we could have promoted on f8 to Alfil, at the cost of only 2 more captures. (2021-05-02)
A.Buchanan: The duals are pretty unsavoury, not just the transposition at the start. Many of them involve mating on the back rank. Exploration with Olive is amusingly complicated by the fact that both Ferz and Alfil are by default both figured with left-leaning bishop. Don't know how to change that... However, I have found: 4k3/4P3/4P3/4P3/4P2B/4P1Q1/4P3/4K2R which is sound (B=Alfil, Q=Ferz in this diagram #6 C+ Popeye 4.85 (2021-05-02)
A.Buchanan: Could do it with 2 Alfil instead, but then it's 16 pawn captures if we insist on promoting in the Chaturanga way on f8. Do need one promoted Alfil for soundness. The good thing about these weedy pieces is that they help avoid cooks. The knight was terrible. Does anyone mind that wR is shifted to h1? Nice that such a "retro" problem has retro aspects in the chess sense too :D (2021-05-02)
comment
Keywords: Illegal position (wAFh2), Non-standard material (AF)
Pieces: ll = Alfil (AF)
Genre: n#
FEN: 4k3/4P3/4P3/4P3/4P3/4P3/4P2*3B/R1N1K3
Reprints: 75a. 100 Classics of the Chessboard , p. 173,
Tim Krabbé's Website #146 10/31/2000
Input: James Malcom, 2021-05-02
Last update: A.Buchanan, 2021-05-02 more...
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