Die Schwalbe

40 problem(s) found in 6954 milliseconds (displaying 40 problem(s)). [STIP='Chess960' or STIP='Fischer Random Chess' or STIP='Schach-960'] [download as LaTeX]

1 - P1004178
Bernd Gräfrath
11590 Die Schwalbe 196 08/2002
P1004178
(11+7)
Wer darf rochieren? Letzter Zug?
Fischer Random Chess
Grundstellung Weiß: Da1, Tb1, Lc1, Sd1, Se1, Kf1, Tg1, Lh1; Grundstellung Schwarz: Da8, Tb8, Lc8, Sd8 Se8, Kf8, Tg8, Lh8.
Im Originaldiagramm waren versehentlich die Felderfarben vertauscht.
comment
Keywords: Last Move?, Chess960 (DTLSSKTL)
Genre: Retro, Fairies
FEN: 1r3k2/pppp4/6p1/8/B3P2P/8/1PPP1PP1/R4KR1
Reprints: 960/3 feenschach 189, p. 211, 11/2011
Input: Gerd Wilts, 2002-08-27
Last update: A.Buchanan, 2015-02-21 more...
2 - P1085422
Michael Schlosser
13452 Die Schwalbe 226 08/2007
P1085422
(16+16)
BP in 4.0
Chess960
R: 1. ... Sf6-e8 Sd3-e1 2. Ke8-f8 Ke1-d1 3. Tf8-g8 Td1-c1 4. Sg8-f6 Sc1-d3
play all play one stop play next play all
Anfangsstellung: ldstktsl/bbbbbbbb/8/8/8/8/BBBBBBBB/LDSTKTSL
BP dann 1. Sd3 Sf6 2. Tc1 Tg8 3. Kd1 Kf8 4. Se1 Se8
Paulo Roque: Solution:
Starting position requirements
The starting position for Chess960 must meet certain rules. White pawns are placed on the second rank as in regular chess. All remaining white pieces are placed randomly on the first rank, but with the following restrictions:
The king is placed somewhere between the two rooks.
The bishops are placed on opposite-colored squares.
The black pieces are placed equal-and-opposite to the white pieces.
(vide http://en.wikipedia.org/wiki/Chess960)


Fischer Random Chess (Chess960) the initial positions are symmetric, then by retroplay:
0... Sf6-e8 -1. Sd3-e1 Ke8-f8 -2. Ke1-d1 Tf8-g8 -3. Td1-c1 Sg8-f6 -4. Sc1-d3 (FCR)

FCR-starting position:
ldstktsl/bbbbbbbb/8/8/8/8/BBBBBBBB/LDSTKTSL
1. Sd3 Sf6 2. Tc1 Tg8 3. Kd1 Kf8 4. Se1 Se8 (position diagram) (2009-06-10)
SBD: That is very neat, Mario, thank you for the clarification.

Is there room/interest for other Fischer random chess problems of this type, as I have always had an interest in FRC, but when I composed a few problems using FRC in 2005, there seemed little interest in the problems (of course maybe they just weren't that good... always possible with me!) (2009-06-11)
Mario Richter: The typo FCR in my above comment is of course a typical Freudian slip (FCR=Fairy Chess Review).

With respect to Steven's question, what I can say is, that the Schwalbe solvers have not been very enthusiastic about that problem, one comment e.g. reads: "Das ist nicht sehr aufregend, aber vielleicht ist beim FRC nicht viel mehr drin."
I share the first part of that solver's opinion, but in contrast to him I think, that challenging FRC-retros may well be possible (I see some slight parallel here to coloring retros). So, SBD - that's your chance to prove me correct! (2009-06-12)
more ...
comment
Keywords: Unique Proof Game, Chess960
Genre: Retro, Fairies
FEN: bqnrnkrb/pppppppp/8/8/8/8/PPPPPPPP/BQRKNRNB
Reprints: 960/6 feenschach 189, p. 212, 11/2011
188 Variant Proof Games 2015
Input: Gerd Wilts, 2009-06-08
Last update: A.Buchanan, 2020-12-22 more...
3 - P1092266
Alfred Pfeiffer
14246 Die Schwalbe 239 10/2009
8. Lob
P1092266
(16+10)
#3
Fischer Random Chess
1. Tf1? 0-0-0!
1. 0-0! droht 2. Sfd7,Sf~ ... 3. Tf8#
1. ... b6,b5 2. Sfd7
1. ... e5,e6,Kd8 2. Se6
1. ... Txg6 2. Sxg6
1. ... hxg6 2. Sh7
play all play one stop play next play all
1.0-0! beweist, daß Weiß weder D noch TT gezogen hat. Der sLa8 kann also nur durch Sb6xa8 geschlagen worden sein, dabei mußte der sK aus dem Schach ziehen.
Erstlingswerk
Sally: 1. 0 0 - Bb5/Bb6. 2. Sfd7;
1.-Be5/Be6,2. Sf(x)e5+,
1.-Txg6, 2.Sxg6,
1.-Bhxg6, 2.Sh7
Retrostrategie im Frs. (2010-06-30)
Alain Brobecker: 1.Rf1? doesn't work, since then black's o-o-o is not forcedly broken.
But if white plays 1.o-o then the WRs and the WQ must not have moved, so the BBa8 has been captured home by a WN, and the BK must have moved!
1.o-o! then
1... hxg6 2.Nh7 Rxh7 3.Rf8#
1... b6 2.Nd7 Qxc6 3.Rf8#
1... Rxg6 2.Nxg6 ~ 3.Rf8# (2010-09-26)
Henrik Juel: A most impressive debut, Alfred (2020-05-04)
A.Buchanan: Very nice! :) (2020-05-04)
more ...
comment
Keywords: Chess960, Castling, mutual exclusive, Knight's wheel (halbes)
Genre: Retro, 3#, Fairies
FEN: qrk2N2/Ppp1p2p/2P3Pr/2Np2pB/8/4P3/1PP3PP/BRK3RQ
Reprints: 14246 feenschach 245, p. 654, 10/2010
960/7 feenschach 189, p. 212, 11/2011
4 Schach , p. 59, 06/2020
Input: Gerd Wilts, 2009-10-12
Last update: Alfred Pfeiffer, 2020-05-25 more...
4 - P1110975
Alain Brobecker
F2832 The Problemist 07/2010
dedicated to Florian Bonnet
Composed with a computer
P1110975
(8+8)
Find unique Fischer Random Chess initial setup and games ending in
a) 4. Qc1xPc6#
b) 4. Qb1xBf5#
a) STDLKTLS 1. c4 b6 2. c5 Da6 3. c6 dxc6 4. Dxc6#
b) SDLLTKTS 1. c3 d6 2. Lb3 Lf5 3. Lxf7 Kxf7 4. Dxf5#
play all play one stop play next play all
more ...
comment
Keywords: Chess960, Synthetic problem
Genre: Retro, Fairies
FEN: 8/pppppppp/8/8/8/8/PPPPPPPP/8
Reprints: 960/9 feenschach 189, p. 212, 11/2011
Input: Gerd Wilts, 2010-07-20
Last update: A.Buchanan, 2020-12-22 more...
5 - P1113792
Andriy Frolkin
14579 Die Schwalbe 244 08/2010
Per Olin gewidmet
3. Lob
P1113792
(13+11)
Letzte 5 Einzelzüge?
Erster Schlag von Weiß?
Chess960
Alain Brobecker: Last move is n... o-o-o+ (BKd1-c1 and BRc1-d1+) which gives us home position of Ks+Rs.
So Chess960 starting position is ??RK????
We had WPe2xdxcxbxa-a8=B and WPf2x?g3 which are all captures by White.
BPc7xb6, BPhxg and BPgxf are all captures by Black.
So no B was captured home, hence Bs were on f+g files, hence Chess960 starting position is ??RK?BB?
BPf4 cannot retract to f6 else BBg8 couldn't have gone out, also BPg5xf4 is not possible otherwise there is no possibility to put back the BBs with the WK in the cage.
So the diagram shows only two retractions by Black in the recent past: BPc7xb6 and BPf5-f4. So we must uncapture a Black piece fast!
n... o-o-o+
n.Qh1-g1!
n-1... c7xBb6
n-1. Bg1-b6
n-2... f5-f4
[n-2.f2x?g3 etc...]
So the Chess960 starting position was NNRKRBBQ
WPe2-e3 is impossible or the light squared BB will not be captured. The play in north-west cage was h7xg6xf5 then g7-g6. So we must have WPe2x?d3, releasing the captured White pieces before we can release the captured BQ, BR or BBs. So the first capture is WPe2xBNd3.
Exactly the kind of problem i enjoy the most: original and pleasant to solve! (2011-03-10)
comment
Keywords: Chess960, Last Moves?
Genre: Retro, Fairies
FEN: BNkr1K1n/Rp1ppp2/1p4p1/p7/5p2/6P1/PPPP2PP/5NQ1
Reprints: 960/11 feenschach 189, p. 212, 11/2011
Input: Gerd Wilts, 2010-08-28
Last update: TBr, 2019-02-15 more...
6 - P1113793
Per Olin
14580 Die Schwalbe 244 08/2010
Andrej Frolkin gewidmet
5. Lob
P1113793
(9+16)
BP in 20
Chess960
LLTDKSTS:
1. Shg3 Se6 2. Sf5 Sc5 3. Sh6 gxh6 4. Se3 Tg4 5. Sd5 Tb4 6. Sb6 axb6 7. c4 La7 8. Lg6 fxg6 9. Da4 Sf7 10. Dc6 bxc6 11. b3 Lb7 12. Lf6 exf6 13. Tc3 De7 14. Te3 O-O-O 15. Te6 dxe6 16. O-O Td5 17. Tc1 Th5 18. Tc3 Sg5 19. Td3 Df7 20. Td6 cxd6
play all play one stop play next play all
Alain Brobecker: bbrqknrn/pppppppp/8/8/8/8/PPPPPPPP/BBRQKNRN

1. Nhg3 Ne6 2. Nf5 Nc5 3. Nh6 gxh6 4. Ne3 Rg4 5. Nd5 Rb4 6. Nb6 axb6 7. c4 Ba7 8. Bg6 fxg6 9. Qa4 Nf7 10. Qc6 bxc6 11. b3 Bb7 12. Bf6 exf6 13. Rc3 Qe7 14. Re3 O-O-O 15. Re6 dxe6 16. O-O Rd5 17. Rc1 Rh5 18. Rc3 Ng5 19. Rd3 Qf7 20. Rd6 cxd6 (2011-03-10)
comment
Keywords: Chess960, Unique Proof Game
Genre: Retro, Fairies
FEN: 2k5/bb3q1p/1ppppppp/2n3nr/1rP5/1P6/P2PPPPP/6K1
Reprints: 960/12 feenschach 189, p. 213, 11/2011
Input: Gerd Wilts, 2010-08-28
Last update: TBr, 2019-02-15 more...
7 - P1113794
Joaquim Crusats
Andriy Frolkin

14581 Die Schwalbe 244 08/2010
Hans Gruber zum 50. Geburtstag gewidmet
P1113794
(10+12)
#1 vor 6
Verteidigungsrückzüger, Typ Proca
Chess960
R: 1. Kd6-c5? Tf4xBf2! 2. c5xb6ep?? b7-b5?? illegal, weil wegen des wLg1 der sLa8 von g8 gekommen sein muss.
R: 1. Kd4-c5! f6-f5+ 2. Kc5-d4 Th6-h5+ 3. f5xg6ep g7-g5 4. Kd6-c5 Dh3-g3,D~ (Tf4xBf2+?? illegal wegen wTh1/sLh8!) 5. c5xb6ep b7-b5 6. Sb6-a4, dann 1. Txa8#
play all play one stop play next play all
Joaquim Crusats: Main plan: -1.Kd6-c5 Q~-(x~)g3+/Rf4-(x~)f2+ -2.c5xb6ep b7-b5 -3.Sb6-a4 & 1.Rxa8#

Refutation: -1?Rf4xPf2! providing for the boxing of wBg1 and thus placing the original black light-squared bishop on g8, implying that it cannot be boxed on a8 and hence ruling out -2.c5xb6ep

Solution: -1.Kd4-c5 f6-f5+ -2.Kc5-d4 Rh6-(x~)h5+ -3.f5xg6ep g7-g5 -4.Kd6-c5 Q~-(x~)g3+/Rf4-(x~)f2+ now the light-squared bB was initially on h8 and -4?Rf4xPf2 is illegal because the wR cannot be boxed on h1, -5.c5xb6ep b7-b5 -6.Sb6-a4 & 1.Rxa8# (2011-08-09)
Alfred Pfeiffer: The comment to the -4. move should be: "now the light-squared wB was initially on h1 ..." (2012-09-15)
comment
Keywords: Chess960, Defensive Retractor, Type Proca
Genre: Retro, Fairies
FEN: bk5b/7p/1Pp1p1P1/2K2p1r/N6P/1P1p2q1/2p2r1P/R5BR
Reprints: 960/13 feenschach 189, p. 213, 11/2011
Input: Gerd Wilts, 2010-08-28
Last update: Alfred Pfeiffer, 2016-06-29 more...
8 - P1202291
Alfred Pfeiffer
14949 Die Schwalbe 250 08/2011
P1202291
(4+4)
ser-s-Rochade in 5 (AP)
Fischer Random Chess
1. cxd6ep 2. d7 3. d8=L 4. Lg5 5. Lh6 0-0
play all play one stop play next play all
more ...
comment
Keywords: Chess960, Series mover, a posteriori (AP), Valladao Task, forced castling, En passant as key, under-promotion (L)
Genre: Retro, Fairies
FEN: 6kr/7p/2P1P3/2PpK3/8/8/8/8
Input: Gerd Wilts, 2011-09-11
Last update: Alfred Pfeiffer, 2017-09-21 more...
9 - P1206035
Bernd Gräfrath
U171 König & Turm 9 12/2002
P1206035
(3+1) cooked
-1w -> #2
Fischer Random Chess
R: 1. Td4-d1, dann 1. 0-0! (g-Rochade) Kh3 2. Tf3#
play all play one stop play next play all
Nicht Rücknahme der scheinbar vollzogenen langen Rochade!
Kc1 und Th1 stehen auf ihren Ausgangsfeldern, Td1 kam von a1 oder b1.
Cook: Anders als im Normalschach gibt es beim FRC für die Rücknahme einer Rochade meist mehrere Vorrochadestellungen. Hier gibt es 4 Nebenlösungen durch Rücknahme der langen Rochade (c-Rochade): wK-f1 und wT-a1/b1/c1/d1, danach vorwärts 1.Ta4/b4/c4/d4 Kf3 2.Th3#
Korrektur in P1376325
more ...
comment
Keywords: Chess960, Castling
Genre: Fairies, Retro
FEN: 8/8/8/8/8/6k1/8/2KR3R
Reprints: 960/4 feenschach 189, p. 211, 11/2011
Input: Hans Gruber, 2011-10-09
Last update: Alfred Pfeiffer, 2020-05-25 more...
10 - P1244551
Alfred Pfeiffer
Rainer Staudte

524 mpk-Blätter 06/2012
Lob
Informalturnier 2012/13
P1244551
(8+8)
s#6
Fischer Random Chess
1. La2 d5 2. Lxd5 d6 3. Lf7 d5 4. Te1 d4 5. La2 d3 6. Lb1 0-0#
play all play one stop play next play all
SBD: This is a neat idea, but don't you have to say which start position was used to verify castling? (2012-07-15)
Mu-Tsun Tsai: I guess this goes back to the castling convention: unless it can be proven that the castling right was lost, assume that it is still there. Since we cannot disprove, from this position, that Black might have the right to castle, the solution makes sense to me. (2012-07-15)
comment
Keywords: Epaulettenmatt, Castling, Round Trip (L), Chess960, forced castling
Genre: Fairies
FEN: 5krb/3p2p1/3p2P1/1p6/1P6/4R2p/3P3P/1B3KR1
Reprints: 5 Schach , p. 60, 06/2020
Input: Frank Müller, 2012-07-14
Last update: Rainer Staudte, 2020-07-10 more...
11 - P1267598
Alfred Pfeiffer
Michael Schlosser

634 Gaudium 112 07/09/2011
P1267598
(2+4)
ser-s+10
Fischer Random Chess
1. e3 2. exd4 3. d5 4. d6 5. d7 6. d8=L 7. Lg5 8. Lh6 9. Kg5 10. Kf6 0-0+
play all play one stop play next play all
Keywords: Chess960, Miniature, Minimal, Excelsior, white (verzögert), under-promotion (L), forced castling, Series mover
Genre: Fairies
FEN: 6kr/7p/8/8/3p3K/8/4P3/8
Input: Alfred Pfeiffer, 2013-04-17
Last update: Alfred Pfeiffer, 2014-01-06 more...
12 - P1267599
Alfred Pfeiffer
2596 Rochade Europa 12/2011
P1267599
(2+16)
ser-s-Rochade in 36
Fischer Random Chess
1. Kf5 2. Kg4 3. Kh3 4. Kh2 5. Kxh1 6. Kg2 7. Kf3 8. Ke4 9. Kxd3 10. Ke2 11. Kxd1 12. Ke2 13. Kd3 14. Kc4 15. Kb5 16. Ka4 17. Ka3 18. Kxb2 19. Kxb3 20. Kc4 21. Kxd4 22. Ke5 23. d4 24. d5 25. d6 26. d7 27. d8=L 28. Lxc7 29. Lxa5 30. Lb6 31. Lxa7 32. Lf2 33. Lxh4 34. Lxg5 35. Lxh6 36. Kf6 0-0
play all play one stop play next play all
Keywords: Chess960, forced castling, Pure Round Trip (K), Round Trip (K), Excelsior, white, under-promotion (L), Series mover
Genre: Fairies
FEN: 6kr/p1p2p1p/5K1q/p5p1/3p3b/1n1p4/1r1P4/3n3b
Input: Alfred Pfeiffer, 2013-04-17
Last update: Alfred Pfeiffer, 2017-02-02 more...
13 - P1267600
Michael Schlosser
Alfred Pfeiffer

1806 harmonie 108 12/2011
P1267600
(5+8)
ser-s-Rochade in 7
Duplex
Fischer Random Chess
w) 1. 0-0 2. Txf4 3. Txe4 4. Txe6 5. Txh6 6. Tf6 7. h6 0-0
s) 1. ... e5 2. exd4 3. d3 4. d2 5. d1=L 6. Lg4 7. Lh3 0-0
play all play one stop play next play all
Keywords: Chess960, forced castling, under-promotion (L), Castling, Series mover
Genre: Fairies
FEN: 6kr/7p/4p2p/3p3P/3Pnp2/8/7P/6KR
Input: Alfred Pfeiffer, 2013-04-17
Last update: Alfred Pfeiffer, 2017-02-02 more...
14 - P1267734
Bader Al-Hajiri
Tim Krabbé's Website 09/2007
dedicated to Tim Krabbe
nach William A. Shinkman
P1267734
(8+1)
#8
Fischer Random Chess
1. 0-0-0 Kxa7 2. Td8 Kxa6 3. Td7 Kxa5 4. Td6 Kxa4 5. Td5 Kxa3 6. Td4 Kxa2 7. Td3 Ka1 8. Ta3#
play all play one stop play next play all
Die Nebenlösung der Shinkman-Aufgabe (P1267725) wird so auf einfache Weise vermieden.
http://timkr.home.xs4all.nl/chess2/kuwait.htm
comment
Keywords: Chess960, Castling, corner to corner (a8a1), Rex solus (s), Ideal mate, Pac-Man (k)
Genre: n#, Fairies
FEN: k7/P7/P7/P7/P7/P7/P7/R5K1
Reprints: 327 Chess Problems Out of the Box 04/2018
327 feenschach 230, p. 393, 05-06/2018
Input: Alfred Pfeiffer, 2013-04-19
Last update: A.Buchanan, 2020-10-29 more...
15 - P1268232
Per Olin
64 feenschach 183, p. 381, 24/08/2010
dedicated to Hans Gruber 50
P1268232
(10+15)
BP in 11.0
Chess960
PAS=TKLTDSSL
1. f3 d6 2. Dh4 Dc6 3. Sg3 Dc3 4. dxc3 Le6 5. Lh6 Lb3 6. Td5 gxh6 7. Tg5 hxg5 8. 0-0-0 gxh4 9. Td2 hxg3 10. Kd1 gxh2 11. g3 hxg1=D#
play all play one stop play next play all
paul: Jacobi tested the first 9 moves (~1 hour) (2018-01-30)
paul: With another device, I completely checked this (in 24 min) (2021-01-26)
comment
Keywords: Chess960 (TKLTDSSL), Castling, Phoenix (D), Unique Proof Game
Genre: Retro, Fairies
FEN: rk1r1nnb/ppp1pp1p/3p4/8/8/1bP2PP1/PPPRP3/3K2qB
Reprints: 960/14 feenschach 189, p. 213, 11/2011
Input: Alfred Pfeiffer, 2013-04-23
Last update: A.Buchanan, 2020-12-22 more...
16 - P1271174
Alfred Pfeiffer
15555 Die Schwalbe 260 04/2013
P1271174
(0+0)
Wieviele der 960 möglichen Partie-Anfangsstellungen des Fischer Random Chess (Chess960) sind bei Aufrechterhaltung sämtlicher Rochaderechte beider Seiten mit Schwarz am Zug legal?
108 Stellungen
play all play one stop play next play all
Ohne Rochaderechtverluste können nur die Dame und die Springer ziehen. Ein Tempoverlust geht nur, wenn alle drei direkt nebeneinander stehen. Die Anzahl der PAS des FRC, die dieser Bedingung genügen, ergibt sich dann zu
N = x * y * z, mit
x = Anzahl der Auswahlmöglichkeiten für einen zusammenhängenden 3-Felder-Bereiche auf der Grundreihe;
y = Anzahl der Anordnungsmöglichkeiten von D und 2S innerhalb des ausgewählten 3-Felder-Bereichs der Grundreihe;
z = Anzahl der Anordnungsmöglichkeiten der restlichen Steine auf den übrigen 5 Feldern der Grundreihe.
Die Werte von x, y und z lassen sich leicht ermitteln:
x: Es gibt 6 Möglichkeiten, 3 zusammenhängende Felder auf der Grundreihe auszuwählen (a-c, b-d, ..., f-h), d.h., x = 6;
y: Dame und 2 Springer lassen sich auf drei verschiedene Weisen innehalb des 3-Felder-Bereichs aufstellen, d.h., y = 3;
z: Hier ist es ausreichend, die Anzahl der möglichen Läuferaufstellungen zu bestimmen, der Rest (K und 2T) ist dadurch automatisch festgelegt. Da im 3-Felder-Bereich für D und die 2S die Verteilung der Felderfarben (hell:dunkel) 1:2 (oder 2:1) ist, ist sie in den 5 restlichen Feldern 3:2 (oder 2:3). Weil die Läufer auf Feldern verschiedener Farbe stehen müssen, gibt es 3 Möglichkeiten für den einen und 2 Möglichkeiten für den anderen Läufer. Somit ist z = 2*3 = 6.
Die gesuchte Anzahl ist somit N = 6 * 3 * 6 = 108.
Keywords: Chess960
Genre: Retro, Fairies, Mathematics
FEN: 8/8/8/8/8/8/8/8
Input: Mario Richter, 2013-05-30
Last update: Alfred Pfeiffer, 2014-03-07 more...
17 - P1273714
François Labelle
Messigny 21/05/2013
(after deadline)
P1273714
(11+11) C+
BP in 12.0
Chess960
1. g3 Sd6 2. Dh3 Se4 3. De6 fxe6 4. Scb3 Df3 5. Tc1 Dd3 6. cxd3 Tf8 7. dxe4 Tf5 8. exf5 Lg6 9. Ld5 exd5 10. Tc4 dxc4 11. fxg6 cxb3 12. gxh7 bxa2
play all play one stop play next play all
more ...
comment
Keywords: Volet Pawn (2), Chess960, Unique Proof Game, RIFACE Retro Composition Tourney (2013)
Genre: Retro, Fairies
Computer test: paul: Tested by Jacobi
FEN: nr1k3b/ppppp1pP/8/8/8/6P1/pP1PPP1P/N2KB1R1
Input: Alain Brobecker, 2013-07-02
Last update: A.Buchanan, 2020-12-22 more...
18 - P1281900
Alfred Pfeiffer
10625 feenschach 196 11-12/2012
P1281900
(8+6)
semi-r#9
Fischer Random Chess
1. Da6? patt
1. La6! (verhindert zunächst s0-0-0) b5 2. Lf6 gxf6 3. Te7 f5 4. Ke5 f4 5. Kf6 f3 6. Kf7 f2 7. Ke8 f1=L,f1=S 8. Df7 Lc4,L~,S~ 9. Lxb5 0-0-0#
7. ... f1=D,f1=T? 8. Lxb5 0-0-0#
2. Lh6? gxh6 3. Te7 h5 4. Ke5 h4 5. Kf6 h3 6. Kf7 h2 7. Ke8 h1=D,h1=T! 8. Df7 Dh8+,Th8+
play all play one stop play next play all
Keywords: Chess960
Genre: r#, Fairies
FEN: rk6/p2p2pR/1p1P2P1/1B4B1/1P1K4/8/Q7/8
Input: Alfred Pfeiffer, 2014-01-06
Last update: Rainer Staudte, 2014-01-06 more...
19 - P1281901
Alfred Pfeiffer
10626 feenschach 196 11-12/2012
P1281901
(5+5)
a) r#6
b) sLb3->f7: semi-r#7,
Fischer Random Chess
a) 1. Txb7+ Kc8 2. Tdc7+ Kd8 3. Sc6+ Ke8 4. Tc8+ Txc8 5. Te7+ Kf8 6. Sb4 Tc5#
b) 1. Sc6+ bxc6 2. Txf7 c5 3. Kb5 c4 4. Kc6 c3 5. Kd7 c2 6. Ke8 c1=D,T,L,S 7. Tce7 0-0-0#,Dc8#
play all play one stop play next play all
Keywords: Chess960
Genre: r#, Fairies
Computer test: a) C+ (Popeye 4.51)
FEN: rk6/ppRR4/P7/K7/1N6/1b6/8/8
Input: Alfred Pfeiffer, 2014-01-06
Last update: Alfred Pfeiffer, 2014-01-06 more...
20 - P1297867
Andrew Buchanan
Retros mailing list 08/12/2012
P1297867
(16+16) C+
Proof game in 11.0
Chess960
1. Sb3 g6 2. Kc1 Dc3 3. Tb1 Dh3 4. Se3 Lg7 5. Kd1 Lc3 6. Tc1 f6 7. Ta1 Sf7 8. Kc1 Sfd6 9. Kb1 Lf7 10. Sc1 Lb3 11. Sd1 La4
play all play one stop play next play all
Henrik Juel: The white officers are in the initial position, but a 'triangulation' by Ta1 is needed for 11 moves (2015-02-21)
Henrik Juel: Omitting 11... La4 does not yield a correct shortest proof game in 10.5, as that position (with La4 on b3) can be reached in 10.0 moves in many ways (2015-02-21)
more ...
comment
Keywords: Unique Proof Game, Chess960, Homebase (w), Initial Game Array (w), Capture-free, Tempo Move
Genre: Retro, Fairies
Computer test: Jacobi v0.5.2
FEN: rkn3r1/ppppp2p/3n1pp1/8/b7/2b4q/PPPPPPPP/RKNNBBRQ
Reprints: MatPlus.net Forum 23/04/2018
9 Schach , p. 61, 06/2020
Input: A.Buchanan, 2015-02-21
Last update: Alfred Pfeiffer, 2020-05-25 more...
21 - P1339299
Bernd Schwarzkopf
16981 Die Schwalbe 283 02/2017
Werner Keym zum 75. Geb.
P1339299
(9+11)
Letzter Zug?
Schach-960

Black has no last move so White moved last and must avoid retro-stalemate. R: 1. Kb1xSc1? is not possible because Black pawns already captured 6 times and a promotion would require another 2. So R: 1.0-0-0! (from Kb1 & Ra1), to allow R: 1... Kd1*e2.
Alfred Pfeiffer: No need for R: 1. ... Kd1xe2. Also possible seems R: 1. ... Kd1-e2 2. e2xDTf3. (2017-09-13)
A.Buchanan: @Alfred: we agreed. In the solution I used '*' to indicate 'x' or '-'. Some use 'greater than' for this useful notation, but PDB will eat this symbol. (2017-09-20)
Henrik Juel: 'Greater than' can be seen in stipulations, when twinning requires switching two men
Maybe 'greater than' is allowed in text above the user comments (2017-09-20)
Adrian Storisteanu: Or try what I use in user comments, the HTML greater-than symbol:
     >
(Personally I prefer to use an empty 'box' for move-or-capture, which could be approximated with square brackets [], but I understand it's not commonly used...) (2017-09-20)
A.Buchanan: This feature increases the stakes for PDB users, as any typo will remain unchanged until the Earth falls into the Sun billions of years from now. I know I can use > but I need to remember this during the excitement of typing. Always using '*' is safer. (2017-09-20)
Adrian Storisteanu: I see, you prefer to take a walk on the wildcard side... (2017-09-20)
comment
Keywords: Last Move?, Chess960, Castling
Genre: Retro, Fairies
FEN: 8/5ppp/8/8/8/5PPP/PPPPkrpp/2KRbbnn
Input: A.Buchanan, 2017-09-13
Last update: A.Buchanan, 2017-09-15 more...
22 - P1354596
Per Olin
MatPlus.net Forum 17/04/2018
P1354596
(16+16)
Position after 18.0 moves
Chess960
Game array?
Per Olin: Here is asked for the Chess960 initial position, the play is not unique. Solution:

Both parties have made 8 pawn moves and 10 moves with all the other pieces, i.e. on both sides two of the officers have made two moves or one has made three moves (castling counts as a king's move). Finding out which pieces have moved once and which pieces have moved more than once helps in determining the initial positions of all pieces.

- In the diagram position there are three knights on dark squares and one on light squares; this means that a knight has moved twice (or three knights moved twice or same knight three times).

- The wLg2 and bLc7 come from the same file and consequently one of these bishops (or both of them) has (have) made two moves.

- If there were no castling(s) made, then the kings would need five moves, which taking into account the above, would be too many. At least one castling has taken place and thus at least one of the kings has made two moves.

- There are two possibilities for the fourth and last piece to have moved twice: a) the bishops wLf2 and
bLd7 have started on e1/e8 and then bTe7 has moved twice or b) the bishops wLf2 and bLd7 have not started on e1/e8 and one of them has moved twice. In the latter alternative, e.g. initial positions DTLSKLST and DLSSTKLT, White can reach his diagram position of the officers in 10 moves , but Black can not. Alternative b) is impossible and consequently the fourth piece to have moved twice is the rook on e7.

Summing up: the pieces to move twice are 1) a knight 2) wLg2 or bLc7 3) one of the kings and 4)bTe7.

Conclusions: - wLf2 and bLd7 start on e1/e8 - the uniting file for two knights is the c-file with knights starting on c1/c8 - the previous means that either wSb2 or bSg7 has made two moves by starting on d- or e-file; as the e-file is occupied by bishops, then the knights start on d1/d8 - the black pieces making two moves are bTe7 and bSg7; the white pieces making two moves are wKc2 and wLg2; one of the moves by wK is c-side castling - the previous excludes bLc7 from making two moves meaning that it has started on b8 or d8 and from this follows that wLg2 has started either on b1 or d1; this can not be d1 as it is reserved for a wS and therefore there is a wL on b1 - with bishops on b1/b8 the queens must start on a1/a8 - the black king moves from its initial position g8 to h7 - a black rook is on h8 and, as bTf7 moves only once, the other rook is on f8.

Solution: The sought Chess960 initial position is DLSSLTKT (the moves in addition to the pawn moves are for White 0-0-0, Da1-a2, Sd1-b2, Kc1-c2, Td1-d2, Sc1-e2, Le1-f2, Lb1-e4, Le4-g2, Th1-h2 and for Black Sc8-a7, Da8-b7, Lb8-c7, Le8-d7, Th8-e8, Te8-e7 , Tf8-f7, Sd8-e6, Se6-g7, Kg8-h7). (2021-01-26)
comment
Keywords: Chess960, Castling
Genre: Retro, Fairies
FEN: 8/nqbbrrnk/pppppppp/8/8/PPPPPPPP/QNKRNBBR/8
Input: A.Buchanan, 2018-08-29
Last update: Alfred Pfeiffer, 2018-09-05 more...
23 - P1354597
Valery Liskovets
MatPlus.net Forum 18/04/2018
P1354597
(4+3)
#2
Chess960
1. 0-0 droht 2. Tf8#,Tc1#
1. ... 0-0-0? (would prevent mate, but it is illegal, as the key shows that Kc8 started on f8)
play all play one stop play next play all
VL: This is a retrostrategic problem: fulfilled castling makes, post factum, opponent's one illegal. A very light retro; still Retro, nevertheless! (2018-08-30)
A.Buchanan: @VL: may I suggest shifting wK to e1, to remove unprovided checks. (2018-08-30)
VL: A matter of taste, Andrew. I prefer as is: check threats make the thematic try 1.Rxg4? more inviting at first sight. (2018-08-30)
A.Buchanan: @VL. To me 1. Rxg4 is inviting enough as it captures the only active black piece and threatens two mates in 1. The issue is that the unprovided check allows the solver to eliminate from consideration any other candidate key which is not itself a check or a K move. (2018-08-31)
VL: Of course, Andrew, I compared both options and hesitated. Extra non-thematic tries beyond 1.Ke2? do hide the key slightly better but distract unwillingly from the intention... A minor distinction, and one may consider my choice as a caprice. (2018-08-31)
more ...
comment
Keywords: Chess960, Castling, Aristocrat, Partial Retro Analysis (PRA)
Genre: 2#, Fairies, Retro
FEN: 1rk5/1N2R3/8/8/6n1/8/8/5KR1
Input: A.Buchanan, 2018-08-29
Last update: James Malcom, 2021-02-09 more...
24 - P1354598
Andriy Frolkin
Joaquim Crusats

Phénix 2014
P1354598
(12+13)
-3, dann #1
Proca retractor
Chess960
Keywords: Chess960, Defensive Retractor, Type Proca
Genre: Retro, Fairies
FEN: nN3rkb/1bPN1ppR/p1p2P1P/1p6/8/4pPp1/1PpP3P/5RK1
Reprints: MatPlus.net Forum 18/04/2018
Input: A.Buchanan, 2018-08-29
Last update: Alfred Pfeiffer, 2018-09-05 more...
25 - P1354599
Per Olin

P1354599
(1+7)
h#2 1/3 (two and one third)
Chess960
b) sKc3->f3
Henrik Juel: The joke stipulation means helpmate in four and two third single moves, so White completes a castling, then h#2
In Chess960 a castling consists of these three thirds:
lift K, place T, and place K, so in this problem White has already lifted his king
a) White completes long castling with T to d1 and K to c1, then 1.Kb3 Kb1 2.f3 Txd3#
b) White completes short castling with T to f1 (giving check) and K to g1, then 1.Ke3 Kg2 2.Sd2 Te1# (2018-08-30)
comment
Keywords: Chess960, Joke
Genre: h#, Fairies
FEN: 8/8/8/8/prnp1p2/2kp4/8/4R3
Input: A.Buchanan, 2018-08-29
Last update: Alfred Pfeiffer, 2018-09-05 more...
26 - P1354600
Geir Sune Tallaksen Østmoe
MatPlus.net Forum 16/04/2018
P1354600
(4+4)
#2
Chess960
1. Tf1? 0-0!
1. 0-0! determines the original K square, so now Black may not castle
1. ... e2 2. Se7# (H.Juel)
play all play one stop play next play all
more ...
comment
Keywords: Chess960, Castling
Genre: 2#, Fairies
FEN: 6kr/7p/2N4P/8/8/4p3/8/1K5R
Reprints: 2 Schach , p. 59, 06/2020
Input: A.Buchanan, 2018-08-29
Last update: Alfred Pfeiffer, 2020-05-25 more...
27 - P1354601
Andrew Buchanan
MatPlus.net Forum 20/04/2018
P1354601
(6+2) C+
#5
Chess960
1. 0-0+ Kb2 2. Sxa2 (Zugzwang) Ka3 3. Tf3 (Zugzwang) Kb2 4. c4+ Ka3 5. Ld1#
4. ... Ka1,Kb1 5. Tf1#
R: 1. a3-a2 (forced)
play all play one stop play next play all
This is a classic DP force of castling rights without recourse to the conventions. In orthodox positions where bK is in the corner, the stipulation normally has to be #1 because of the space to the side of wK. Since in Chess960 wT can block this space, it's possible to enjoy a longer mating sequence.
A.Buchanan: Thanks for fixing 0-0 Gerd! (2020-05-02)
Henrik Juel: The Castling Paradox is Chess960 specific here
wKc1 and wTd1 seem to be there after an a-side castling
But in fact they never moved, and they perform an h-side castling as key (2020-08-16)
comment
Keywords: Chess960, Castling, Dead Position, Castling Paradox, Checking key
Genre: n#, Retro, Fairies
Computer test: C+ Popeye 4.79 after the first move (which is the only to avoid immediate pat - that's the point).
FEN: 8/8/8/8/1N6/1B6/p1PR4/k1KR4
Input: A.Buchanan, 2018-08-29
Last update: A.Buchanan, 2020-08-17 more...
28 - P1354602
Andrew Buchanan
MatPlus.net Forum 23/04/2018
P1354602
(7+2) C+
h#4
Chess960
a) 1. ... e4 2. Tb3 Lc4 3. Tb2 Lb3 b) 4. Kb1 0-0#
play all play one stop play next play all
This problem's point is that it does not use the castling convention, because in Chess960 starting configurations such as this K&R are hermetically sealed, and castling rights cannot be disrupted.
Henrik Juel: This is the only one of the Chess960 series I may be able to solve
1... e4 2.Tb3 Lc4 3.Tb2 Lb3 4.Kb1 0-0#
the castling just moves Th1 to f1 (2018-08-29)
Mario Richter: Would the stipulation h#4 also work? (2018-08-30)
A.Buchanan: Yes Mario it would. In fact that was the original stipulation. But then I felt there was no special reason for doing that here. No special effect or concealment. Which do you think is better?wh G (2018-08-30)
Mario Richter: I would prefer h#4 - it gives the solver the chance to detect that White has no last move, thereby adding a litte retroanalytical touch to the problem.
But that is of course only my persona view ... (2018-08-30)
A.Buchanan: Mario I respect your call and have reverted to the original stip. (2018-08-30)
comment
Keywords: Chess960, Castling, No legal last move for White, Homebase (w)
Genre: h#, Fairies, Retro
Computer test: C+ Jacobi v0.5.2 (where it assumes castling rights optimistically)
FEN: 8/8/8/8/8/7r/4PPPP/k4BKR
Input: A.Buchanan, 2018-08-29
Last update: A.Buchanan, 2020-04-24 more...
29 - P1354603
Andrew Buchanan
MatPlus.net Forum 23/04/2018
P1354603
(8+12)
#2
Chess960
Starting location of K & R must be proved not assumed.
1. 0-0-0 droht 2. Td3#,Dxc7#,Dd4#
1. ... Se3,c6,d6
2. Dd4#,Td3#
1. ... Sf2
2. Dxc7#,Dd4#
1. ... g6
2. Dxc7#,Td3#
1. ... Se5
2. Dd4#
1. ... c5
2. Td3#
1. ... dxe6
2. Dxc7#
play all play one stop play next play all
Partial Combinative Separation
Everyone seems to assume that a starting position in Chess960 can be asserted as easily as castling rights. I am slower in my thinking than this. This problem explores the implication of needing to deduce the starting position. Then castling rights can be assumed by the Castling Convention.
comment
Keywords: Chess960, Castling
Genre: 2#, Retro, Fairies
FEN: 2br3b/1ppppppp/4P3/6P1/1P3Qn1/P1k5/2P5/RK6
Input: A.Buchanan, 2018-08-29
Last update: A.Buchanan, 2020-05-02 more...
30 - P1354604
Andrew Buchanan
MatPlus.net Forum 23/04/2018
P1354604
(15+15) C+
Proof Game in 8.5
Chess960
a) (Startposition SLTKLSTD) 1. g4 0-0-0 2. Dxb7+ Kxb7 3. Tg3 Kc6 4. Tc3+ Kd6 5. f3 e6 6. Lg3+ Ke7 7. Ke1 Tc8 8. Ld6+ Kd8 9. Sg3 (=Diagramm)
play all play one stop play next play all
Keywords: Chess960, Castling, Unique Proof Game
Genre: Retro, Fairies
Computer test: Jacobi v0.5.2
FEN: nbrkbnrq/p1pp1ppp/3Bp3/8/6P1/2R2PN1/PPPPP2P/NBR1K3
Input: A.Buchanan, 2018-08-29
Last update: Gerd Wilts, 2020-05-03 more...
31 - P1354607
Andrew Buchanan
MatPlus.net Forum 12/06/2018
P1354607
(16+16) C+
Shortest proof game
Chess960
a) (Startposition LSDTKTSL) 1. Sc3 Sf6 2. Db1 Tg8 3. 0-0-0 Kf8 4. Tde1 Se8 5. Sd1 (=Diagramm)
play all play one stop play next play all
Keywords: Chess960, Unique Proof Game, Castling
Genre: Retro, Fairies
Computer test: Jacobi
FEN: bnqrnkrb/pppppppp/8/8/8/8/PPPPPPPP/BQKNRRNB
Reprints: 8 Schach , p. 61, 06/2020
Input: A.Buchanan, 2018-08-29
Last update: Alfred Pfeiffer, 2020-05-25 more...
32 - P1354611
Geir Sune Tallaksen Østmoe
MatPlus.net Forum 24/08/2018
P1354611
(5+3)
Gewinn
Chess960
1. c5 Lxd7 2. 0-0-0! Kf8 3. Txd7! Txd7 4. c6 Ke7 5. b7 +-
play all play one stop play next play all
Im Normalschach würde 2. Td1 gewinnen, was hier jedoch an 2. 0-0-0 scheitert; aber
nach 2. 0-0-0 kann Schwarz nicht mehr rochieren.
Keywords: Chess960, Castling
Genre: Studies, Fairies
FEN: 3r2k1/3P4/1P6/5b2/2P5/8/8/1R4K1
Reprints: 3 Schach , p. 59, 06/2020
Input: A.Buchanan, 2018-08-29
Last update: Alfred Pfeiffer, 2020-05-25 more...
33 - P1371005
Peter Wong
www.chess.com 12/05/2019
P1371005
(16+16)
Is #1 legal?
Chess960
1. ... Sxg2# is legal, because either queen can lose a tempo so that the diagram is reached with Black to play.
Sample game: 1. Sb3 Se6 2. Sg3 Sf4 3. Kf1 Se6 4. De1 Sf4 5. Dc1 Se6 6. Dd1 Sf4 7. Ke1 Se6 8. Sf1 Sf4 9. Sc1
play all play one stop play next play all
Henrik Juel: No, 1... Sxg2 is illegal, because White has the move (2020-01-08)
Henrik Juel: You are absolutely right, Peter; I missed the queen triangulation (2020-01-09)
comment
Keywords: Chess960
Genre: Retro
FEN: rbnqk1br/pppppppp/8/8/5n2/8/PPPPPPPP/RBNQKNBR
Reprints: www.chess.com 21/12/2019
Input: A.Buchanan, 2019-12-27
Last update: Alfred Pfeiffer, 2020-01-09 more...
34 - P1375788
Andrew Buchanan
MatPlus.net Forum 11/05/2020
P1375788
(16+16) C+
Chess960
a) Shortest Proof Game
b) Second Shortest Proof Game
a) (LLSTKSTD) 1. Sg3 Sg6 2. 0-0 0-0 3. Tfe1 Tfe8 4. Kf1 Kf8 5. Dg1 Dg8 6. Sh1 Sh8
b) (LLSTKTDS) 1. Sg3 Sg6 2. Dh1 Dh8 3. 0-0 0-0 4. Tfe1 Tfe8 5. Kf1 Kf8 6. Dg1 Dg8 7. Sh1 Sh8
play all play one stop play next play all
Author's comment: I thought we must have already found the longest Chess960 SPG with all 32 pieces on their starting ranks. But apparently not! Paradoxically for a Chess960 position, this is symmetrical. Normally since we don't know the starting position, we would have different line-ups for White and Black to force a common starting array. But not in this one! :-)
more ...
comment
Keywords: Chess960, Unique Proof Game, Capture-free, Homebase (2 (kind of)), Initial Game Array (2 (kind of)), Symmetrical position, Symmetrical solution
Genre: Retro, Fairies
Computer test: C+ Jacobi v0.7.4 (11/05/2020)
FEN: bbnrrkqn/pppppppp/8/8/8/8/PPPPPPPP/BBNRRKQN
Input: A.Buchanan, 2020-05-11
Last update: A.Buchanan, 2020-12-09 more...
35 - P1376325
Bernd Gräfrath
(Verb.) König & Turm 2002
P1376325
(4+1)
-1w, dann #2
2 Lösungen
Schach-960
1) R: 1. Td4-d1, dann 1. 0-0 Kh3 2. Tf3#
2) R: 1. 0-0-0[wKf1,wTd1], dann 1. Td4 Kf3 2. Th3#
play all play one stop play next play all
Verbesserung der nebenlösigen P1206035
Keywords: Chess960, Castling, Castling in the retro play
Genre: Fairies
FEN: 8/8/8/8/2P5/6k1/8/2KR3R
Reprints: 6 Schach , p. 60, 06/2020
Input: Alfred Pfeiffer, 2020-05-25
Last update: Alfred Pfeiffer, 2020-05-25 more...
36 - P1379229
Werner Keym
18304 Die Schwalbe 304 08/2020
Hans Gruber zum 60. Geburtstag
P1379229
(3+3)
#4
b) Chess960
a) 1. Txb5! Th1+ 2. Kg2 Tb1 3. Txb1 Kf8,Kh8 4. Tb8#
2. ... Tc1 3. Tb8+ Tc8 4. Txc8#
2. ... Td1 3. Tb8+ Td8 4. Txd8#
2. ... Te1 3. Tb8+ Te8 4. Txe8#
2. ... Tf1 3. Kxf1 Kf8,Kh8 4. Tb8#
2. ... Tg1+ 3. Kxg1 Kf8,Kh8 4. Tb8#
2. ... Th2+ 3. Kxh2 Kf8,Kh8 4. Tb8#

b) 1. Txb5? 0-0+!
1. 0-0-0! Th1 2. Txh1 b4 3.Td1 b3,Kf8,Kh8 4. Td8#
play all play one stop play next play all
Henrik Juel: Part a is C+ by Popeye 4.61
For part b the intention is probably 1.Txb5? 0-0! (2020-08-22)
comment
Keywords: Chess960, Castling, Switchback (T), Miniature
Genre: Fairies
FEN: 6kr/R7/8/1p6/8/8/8/1R3K2
Input: Rainer Staudte, 2020-08-22
Last update: TBr, 2021-02-11 more...
37 - P1383320
Per Olin
18234 Die Schwalbe 303 06/2020
P1383320
(16+16)
Beweispartie in
19 Zügen Schach-960
Per Olin: The solution consists of finding the Chess960 initial game array (Chess960IGA) and the play leading to the diagram position.

Chess960IGA The minimum number of moves by White counted by groups: - a) pawns 2, - b) knights 4, - c) the diagonal pieces Q, B, B: the pawn move to g3 comes before f3 enabling the white lightsquared bishop to move. The move f3 mobilizes the darksquared bishop; the move b6 by Black must be made before the wB comes to b7. Moving wB to b7 in one single move, before f3 and after b6 have been made, would prolong the paths for wQ to a6 and/or wB to c7 too much; therefore the bishop comes to b7 in at least two moves and this takes place after wQ and wBc7 have reached their final squares. The move c5 by Black must come when the darksquared wB is on b6, and this must be preceded by the wQ to a6. The wSh5 and the lightsquared bishop have started on f1 and h1, leaving e1 and g1 for wQ and wB. The piece starting on g1 needs two moves and the piece starting on e1 needs three moves. This gives a minimum of 7 moves for the diagonal pieces. - d) K, R, R: as, with minimum number of moves, the four squares e1-h1 are the initial squares of the three diagonal pieces and wSh5, then the king and rooks start somewhere on a1-d1. White makes g-side castling, moves the king to e3, Rf1-f2 ; to g2 moves the other rook, which started on the left side of the king. This means a minimum of 6 moves taking the total up to 19 as per stipulation.

Determining the piece order On a1-d1: the wSf4 has made two moves starting on c1; this gives the initial square b1 for the king and a1 + d1 for the rooks. On e1-h1: if wSh5 has started on h1, then the lightsquared bishop would need to have started on f1; this would increase the total number of moves over the stipulated; therefore wSh5 starts on f1 and the bishop on h1. If the wQ started on g1 then the Chess960IGA would have been RKSRBSQB; however, analyzing the end position of Black, with bBc8 starting on e8 then the number of black moves would rise over the stipulated by one (K 3 including c-side castling, Q 1, Rs 2, Bs 6, Ss 4, ps 4). The bishops start on g1/g8 and the sought Chess960IGA is RKSRQSBB.

Play from Chess960IGA RKSRQSBB is 1.Sg3 g6 2.Sh5 Be5 3.g3 f6 4.Be4 Bd5 5.f3 Se6 6.Qf2 Qh8 7.Qb6 Rg8 8.Qa6 Sb6 9.Sd3 O-O-O 10.Sdf4 Sa8 11.Bb6 Rdf8 12.O-O Kd8 13.Kf2 Ke8 14.Ke3 c5 15.Rf2 Bb8 16.Bc7 b6 17.Rg1 Bb7 18.Rgg2 Bc8 19.Bb7 Sd8

Computer tests: Full Jakobi test from all Chess960 initial positions for the 18.5 first moves (leaving out only the move 19. - Sd8). Tested to full length 19.0 moves with constraints that Ra1, Kb1 and Sc1 and corresponding black pieces are given. (2021-01-26)
comment
Keywords: Chess960, Unique Proof Game
Genre: Retro, Fairies
FEN: nbbnkrrq/pBBpp2p/Qp3pp1/2p4N/5N2/4KPP1/PPPPPRRP/8
Input: Gerd Wilts, 2020-12-23
Last update: A.Buchanan, 2021-04-06 more...
38 - P1386622
Andrew Buchanan
2 Problemas , p. 1051, 01/2021
P1386622
(0+0) C+
Which Chess960 starting position (with kings on the kingside) gives the smallest number of possible SPGs that reach game array diagram, but with *Black* to move?

PG in 6.5
18 x 489 = 8,802 solutions
Keywords: Non-Unique Proof Game, Chess960, Fake game array, Aristocrat, Kindergarten Problem, Miniature
Genre: Retro, Fairies
Computer test: C+ Jacobi v0.7.5
FEN: 8/8/8/8/8/8/8/8
Input: A.Buchanan, 2021-02-19
Last update: A.Buchanan, 2021-02-19 more...
39 - P1389081
Per Olin
Chess Problems & Studies Discord Server 4/4/2021
4th Place
CP&S Discord Server Composition Tourney 0 {}
P1389081
(2+3)
Chess960
Add the Black king to give the shortest possible helpmate
Try: +bKd8 and 1. 0-0-0 Ld3 2. Lb8 La6#
sBd5 prevents solutions like:
+Ka8 and 1. Lb8+ Kb6 2. Th8 Le4# or 1. Th8 Le4 2. Lb8 Kb6# making the try unique.
1. (0)-0-0! Ld3 2. Lb8 La6#
play all play one stop play next play all
The rules for Chess960 castling says that 'it is recommended that the king be moved outside the playing surface next to his final position, the rook then be moved from its starting position to its final position, and then the king be placed on his final square'.

The bK is added on c9, whereby 1/3 of the castling has been performed (previous square for bK was d8), and remains 2/3 (two thirds) of the castling, which is performed by Rc8 moving to d8 and bK moving to c8. The helpmate is then in 1 5/6 moves (one and five sixths) by starting with finishing the castling.

PR Edderiofer comment: "This is a reprise of the joke from 9th place, but in a much simpler setting. This one arrived ten minutes before the submission period closed, again on the same day when I was already extremely tired, so thankfully I was able to appreciate this one better! Adding a piece outside the board is pretty cool."
Henrik Juel: maybe something like
complete a Chess960 castling ending with Tc8 on b8 and sK on c8, then
1.Ld8 Lf5# (2021-04-30)
comment
Keywords: Joke, Chess960, Castling (Complete or retract), Minimal, Miniature
Genre: h#, Fairies
FEN: 2r5/2b5/2K3B1/3p4/8/8/8/8
Reprints: MatPlus.net Forum 4/4/2021
Input: A.Buchanan, 2021-04-29
Last update: A.Buchanan, 2021-05-02 more...
40 - P1389100
Per Olin
Chess Problems & Studies Discord Server 4/4/2021
9th Place
CP&S Discord Server Composition Tourney 0 {}
P1389100
(31+0)
31 undetermined pieces. Black is making his 3rd move and White mates in his 4th. Chess960 initial game array and game?
Keywords: Joke, Chess960
Genre: Retro, Fairies
FEN: PP2PPPP/P1PPPPPP/PP6/8/8/4P1P1/PPPPPP1P/PPPP1PPP
Reprints: MatPlus.net Forum 4/4/2021
Input: A.Buchanan, 2021-04-30
Last update: A.Buchanan, 2021-04-30 more...
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