112447 problem(s) found in 2391 milliseconds (displaying 100 problem(s)).

1 - P0000032
Frank Christiaans
5466v Die Schwalbe 98 04/1986
P0000032
(15+12)
h#3
Schwarzer Schlag: d7xLe6. UW sBh7-h1=L. Weiße Schläge: fxe3, gxh2, hxg. Falls auf h3 ein sS geschlagen wurde, musste später auf g1 eine UW des sBg7 in einen sS erfolgt sein, der über f3 weggezogen sein muss, so dass der wKe1 gezogen hat. Falls auf h3 eine sD geschlagen wurde, müssen entweder der sK oder sTh8 bereits gezogen haben. Die Rochaden schliessen sich also aus.
1. Lh7 Kf2! (0-0-0?) 2. 0-0 Tg1 3. Sh8 Sh6#
play all play one stop play next play all
Keywords: Cant Castler, Non-standard material, Castling (wg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-5-16 more...
2 - P0000036
Waleri A. Liskowez
Nikita M. Plaksin

5528 Die Schwalbe 99 06/1986
P0000036
(10+11)
h#2 (AP, RV)
Weiß zieht an
1) 1. ... cxd6ep 2. 0-0-0 Dxc7#
Nicht 2. Kf8 Dg8? da der ep-Schlag AP bewiesen werden muss.
2) 1. ... gxf6ep 2. 0-0-0 Tg8#
Nicht 2. Kf8 Tg8#? da der ep-Schlag AP bewiesen werden muss.
play all play one stop play next play all
VL: Solution:
I 1... c*d6 e.p. 2.0-0-0 Q*c7#
II 1... g*f6 e.p. 2.0-0-0 Rg8#

NOT:
2.Kf8? Q/Rg8#?? no AP-justification!

Castling implies e.p. 'a posteriori' and is necessary only to this end. (2002-4-3)
comment
Keywords: a posteriori (AP), En passant, Partial Retro Analysis (PRA), Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-7-11 more...
3 - P0000037
Nikita M. Plaksin
Waleri A. Liskowez

5529 Die Schwalbe 99 06/1986
P0000037
(13+10)
h#2 (AP)
1. dxc3ep 0-0 2. 0-0-0 La6#
Nicht 1. ... ... 2. 0-0-0 La6#, 1. ... 0-0 2. f5? Lb5#?, da der ep-Schlag AP bewiesen werden muß.
play all play one stop play next play all
VL: Solution:
1.d*c3 e.p. 0-0 2.0-0-0 Ba6#

NOT:
1... @? 2.0-0-0 Ba6#??
1... 0-0 2.f5? Bb5#?? no AP-justification!

To preserve both castling, the last Bl's move had to be c3*b2 with wPc2.
Both castling together imply e.p. 'a posteriori' and are necessary only
to this end. (2002-4-3)
more ...
comment
Keywords: a posteriori (AP), En passant, Non-standard material, Castling (wksg)
Genre: h#, Retro
Reprints: StrateGems 51, p. 148, 07-09/2010
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-7-11 more...
4 - P0000047
Nikita M. Plaksin
5646 Die Schwalbe 101 10/1986
P0000047
(11+10)
h#2*
*) 1. ... 0-0-0 2. Txf2 Dxg1#
1) 1. cxd2+ Kxd2 2. Txf2 Dxg1#
R: 1. Da8-h8 2. d3xTe4 Da2-a8 3. c2xSd3+ Sc1-d3+ 4. b4xLc5 Db1-a2 5. b3-b4 a2xSb1=D 6. Sa3
play all play one stop play next play all
Keywords: Castling (wg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-4-23 more...
5 - P0000057
Frank Christiaans
5466v Die Schwalbe 102 12/1986
P0000057
(15+13)
h#3
1. Sh7 Kf2 (0-0-0?) 2. 0-0 Tg1 3. Sh8 Sh6#
Schwarzer Schlag: d7xLe6. Weiße Schläge: f2xe3, g2xh3, hxg. Falls auf h3 ein sS geschlagen wurde, muss sich später der sBg7 auf g1 in einen sS umgewandelt haben und über f3 weggezogen sein, so dass der wK bereits gezogen hat. Falls auf h3 eine sD oder sT geschlagen wurde, haben entweder sK oder sT bereits gezogen. Die beiden Rochaden schliessen sich also aus.
play all play one stop play next play all
Keywords: Non-standard material, Castling (wgsk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-5-16 more...
6 - P0000058
Leonid M. Borodatow
5758v Die Schwalbe 103 02/1987
P0000058
(13+9)
h#3
b) sBa6 statt sLa6
a) 1. ... exf6ep 2. 0-0-0 Lxf4 3. Td7 a8=D#
b) 1. ... Kxf4 2. Te7 e6 3. Tb8 axb8=D#
play all play one stop play next play all
Keywords: En passant as key, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2013-7-16 more...
7 - P0000101
Leonid M. Borodatow
Evgeny V. Kharichev

6209v Die Schwalbe 110 04/1988
P0000101
(12+10) cooked
h#3
b) sBh5 nach h6

play all play one stop play next play all
Cook: a) 1. hxg3 Sxg3 2. c6 Sf5 3. 0-0-0 Sd6#
b) 1. Kf7 f4 2. Kg6 c4+ 3. Kh5 g4#
Neufassung 5949.
comment
Keywords: Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-10-25 more...
8 - P0000159
Frank Christiaans
6926 Die Schwalbe 122 04/1990
P0000159
(13+14)
h#2*
Henrik Juel: Black captured axb, dxe, and exf, and promoted b1=L twice and e1=T; White captured [Ph7] and b2xPc3, and promoted on a8.
White to move:
-1... g7 -2.g2 Sg5, etc. 1... hxg6ep 2.fxg6 Sxg6#.
Black to move:
-1.g2 g7 -2.Sg4, etc. 1.fxg3ep Txe3 2.Lxh5 Lxg3#. (2012-8-30)
comment
Keywords: En passant, Non-standard material, Promotion (ll)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-10 more...
9 - P0000366
Hanspeter Suwe
8416 Die Schwalbe 145 02/1994
P0000366
(7+8)
h#3 (AP)
Leider hatte ich einen sSf8 unterschlagen, was bei denjenigen, welche die Korrektur auf S. 482 nicht (rechtzeitig) beachtet haben, zu 'Unsicherheiten' führte - nicht verwunderlich angesichts der trivialen NL in der gedruckten Stellung (z.B. 1. Kf8 0-0 2. Kxg8 Ta1 3. Kh8 Txa8#). Gedacht war's aber so: Alle möglichen vollzügigen Lösungen (d.h. mit Schwarz am Zuge) erfordern beide Rochaden. Die Rochaden schließen sich aber aus retroanalytischen Gründen aus. (Weiß zuletzt: K- oder T-Zug, dann ist die w0-0 unzulässig; zuletzt g2xLg3 und wLg8 ist UW-Figur mit Störung der schwarzen Rochaderuhe durch den umgewandelten B auf d7 oder f7, dann ist die s0-0-0 unzulässig;). also 1. ... 0-0 2. 0-0-0!! mit AP-Legalisierung des unkonventionellen Anzugs Tf1-a1 3. Td8-d7 Ta1-a8#. Einmal eine nicht so sophistische Neuheit im AP-Bereich! Einige Löser, bei denen ich inzwischen aufklärerisch tätig war, konnten mit der in letzter Zeit seltener gewordenen AP-Philosophie bzw. ihrem Kennzeichen 'AP' nichts anfangen - kamen aber nicht auf die Idee, mit eine Postkarte zu schreiben oder bei mir anzurufen (???) GL. 5+5P.
play all play one stop play next play all
Keywords: Castling (wksg), a posteriori (AP), Castling, mutual exclusive
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-7-4 more...
10 - P0000401
Andrey Frolkin
Anatolii Vasylenko

4296 Die Schwalbe 80 04/1983
P0000401
(9+12)
h#3* (AP)
1. ... dxc6ep 2. 0-0 h5 3. Kf7 Sxd6#
1. 0-0 Se5 2. Kh8 Lc2 3. Tg8 Sf7#
play all play one stop play next play all
Henrik Juel: If Black may castle, White captured fxPg and g7xBf8=B. 1.dxc6ep 00! 2.h5 Kf7 3.Sxd6#; 0... 00 1.Se5 Kh8 2.Bc2 Rg8 3.Sf7#. (2003-11-7)
comment
Keywords: a posteriori (AP), En passant, Castling (sk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-10-8 more...
11 - P0000472
Leonid M. Borodatow
5208v Die Schwalbe 94 08/1985
P0000472
(13+9)
h#3 (AP?)
Weiß zieht an
1. ... gxf6ep? 2. 0-0-0?? f5 3. Sc4 Txc4#
1. ... Se1 2. Kf7 Ld5+ 3. Kg6 Th6#
play all play one stop play next play all
Keywords: a posteriori (AP), En passant, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-10-8 more...
12 - P0000527
Lothar Finzer
3324 Die Schwalbe 66 12/1980
P0000527
(10+11)
h#3
Sally: Der letzte schwarze Zug muss Weiss eine Rückzumöglichkeit
einräümen. Als Lc1 x Db2!,weil sich vor Lc1 x Tb2 die SW -
Ecke nicht entwirren läßt.Diese 2. wD kann nur durch Umwandlung des wB auf c8/d8/e8/f8/g8 entstanden sein!,wobei
der wB oder die UW-D durch das Schachgebot den sK zum
ziehen zwang.Bei Bc8D ist der La2 ein UW-L und muß auf dem Weg nach c8 denw Otri Läufer geschlagen haben, was den wBzum Weg über das Feld d7 zwingt!
1. - Kxa2?,2.0-0 -Bexd3,3. Te8 - Dxe8#, ist also illegal!
1. - Kxa2, 2. Kf8/Kf7(Dual)-Bexd3, 3.Te8- De8# (2010-6-19)
Mario Richter: Der sLa2 ist auf jeden Fall ein UW-L. Die nach dem einzig möglichen Rückzug Lc1xDb2 auf dem Brett stehende, aus dem wBh2 hervorgegangene wUW-D könnte ohne Rochadezerstörung nur auf c8 entstanden sein. Dazu hätte der wBh2 auf seinem Wege nach c8 aber auch den Original-sLc8 geschlagen haben müssen, und der Weg dieses wB hätte somit zwingend über d7 geführt, was auch Rochadeverlust für Schwarz bedeutet. Lösung somit: 1. - Kxa2, 2. Kf8/Kf7(Dual)-Bexd3, 3.Kg8 De8# (2010-6-21)
comment
Keywords: Castling (sk), Cant Castler
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2010-6-21 more...
13 - P0000553
Andrey Frolkin
Günter Lauinger

3468 Die Schwalbe 68 04/1981
P0000553
(10+11) cooked
h#2
AL: 1. exd3ep 0-0 2. cxb4 Tf4#
NL: 1. cxd4 Th4 2. d3 Txe4#
play all play one stop play next play all
siehe P000583
comment
Keywords: En passant as key, Castling (wk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
14 - P0000583
Andrey Frolkin
Günter Lauinger

3468v Die Schwalbe 72 12/1981
P0000583
(10+12)
h#2 (AP)
1. exd3ep 0-0 2. cxb4 Tf4
play all play one stop play next play all
Mario Richter: 1. exd3ep 0-0 2. cxb4 Tf4 ist nur Verfuehrung (scheitert an schwarzer Bauern-Schlagbilanz).
Loesung: 1. ... w0-0! (AP-Legalierung des weissen Anzugrechtes) 2.cxd4 Tc1# (2009-2-10)
comment
Keywords: Castling (wk), a posteriori (AP), En passant as key
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-10-8 more...
15 - P0000595
Andrey Frolkin
3873 Die Schwalbe 74 04/1982
P0000595
(9+13)
h#3 (AP)
1. ... a5xb6 e.p. 2. 0-0-0 (AP-Legalisierung des e.p.-Schlages) 0-0 (AP-Legalisierung des Anzugrechts) 3. Td7 a8=D#
(Wenn Weiß noch rochieren darf, muß er am Zug sein, wenn ferner auch Schwarz noch rochieren darf, muß zuletzt b7-b5 geschehen sein [um Bb6xDa7 zu ermöglichen].)
play all play one stop play next play all
hans: 1. 0-0-0 0-0 2. Td7 Td1 3. Tc7 a8=D#
Both rochade needed to be saved. But what is White's last move? g2-g3? (Black needs 7 captures so also Lf1) b4xa5?(too many white captures) b6xa7? (looks possible with dxe as second capture, white has only 2 captures)But now all black captures are on white squares, so where is Lc1 captured????????? (2011-2-6)
hans: Forget the comment! I just find the e.p. capture, but is this now H#3? 1. b7-b5 a5xb6e.p. 2. 0-0-0 anything 3. Td7 a8=D#) (2011-2-6)
VL: BPs took 7 including c7xBb6, b5xa4 and g4xh3. WPs took 2: b6xQa7 when bP stood on b7 and dxR if b000 is legal (to be captured by Black). The capture f7xg6 locks h8. Therefore if Black has the move, w00 is illegal. In other words, w00 AP-legalizes W's turn to move. Likewise, BOTH castlings AP-legalize e.p. (R: b7-b5, b6xQa7)!

Solution: 1... axb6 e.p.! 2.0-0-0 0-0! 3.Rd7 a8Q#.
2... ~?? (w00 is exclusively AP-motivated, both for the turn to move and e.p.!).

Thematic try: 1.0-0-0? 0-0?? (2.Rd7 Rd1 3.Rc7 a8Q#). (2011-2-20)
comment
Keywords: Castling (wksg), a posteriori (AP)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2011-2-6 more...
16 - P0000615
Andrey J. Lobusov
4088 Die Schwalbe 77 10/1982
14.Lob
P0000615
(15+6)
h#2* (AP)
VL: The author: Andrej Lobussow (Lobusov).

Solution:
1... Rxh7 2.Kf8 Rxh8#
(1... Kg5? 2.0-0?? Se7#;)
1.cxb3ep (waiting)! Kg5 2.0-0! Se7#
(1... Rxh7? 2.Kf8 Rxh8#??).

W. captured 10 by pawns (including hxPg-g8),
not on the last move (10+6=16).
Bl. took only b3xa2 with w.Pb4 on b2. (2004-6-3)
comment
Keywords: Castling (sk), a posteriori (AP)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-6-5 more...
17 - P0000636
Luis Alberto Garaza
2138 Die Schwalbe 45 06/1977
P0000636
(10+12)
h#1
Mario Richter: White's captures were: Pe2xf3xg4xh5 and Paxb, so wPc7 didn't capture.
White's only last move was therefore Pb2-b4, and the solution is: 1.a4xb3 e.p. Qe4# (2009-4-19)
comment
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-6-2 more...
18 - P0000642
Maurice Edwin MacDowell Jago
2202 Die Schwalbe 46 08/1977
P0000642
(10+13) cooked
h#2
b) sBb4 nach b5
Mario Richter: AL:
(a) 1.Tg2 0-0-0 2.Txg3 Dxh1#
(b) 1.Sb1 Ta4 2.Sxg3 Th4#
Aber (a) nebenloesig, z.B. 1.fxe2 Lxb7 2.Tg2 Dxg2# (2009-1-29)
comment
Keywords: Cant Castler, Castling (wg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2010-5-24 more...
19 - P0000649
André Hazebrouck
2261 Die Schwalbe 47 10/1977
4. Preis
P0000649
(8+14)
h#3
Weiß zieht an
b) AP (2 Lösungen)
Henrik Juel: [I don't follow the silly convention of writing black moves first]. 1.0-0-0 0-0 2.dTg1+ Kh8 3.Txh6#. b) If Ke1,e8 and Th1 never moved, White captured f/hxPg and b6xLa7; if Ta1 also never moved, last white move was b6xLa7. 1.cxb6ep La6 2.0-0/0-0-0 0-0-0 3.a8Q#. The a) solution also works in b). (2003-12-18)
comment
Keywords: a posteriori (AP), Castling (wkwgsk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-10-8 more...
20 - P0000652
Arpad Molnar
2310 Die Schwalbe 48 12/1977
P0000652
(9+15) cooked
h#2
b) sSd6
a1) 1. Td8 a8=D 2. Kf8 Dxd8#
b1) 1. Sf7 gxf7+ 2. Kd8 f8=D#

NL:
a+b) 1. 0-0-0 0-0 2. Kc7 Tc1#
1. 0-0-0 Kd2 2. Kc7 Tc1#
1. Ke7 0-0 2. Kf6 Dxd6#
play all play one stop play next play all
Paulo Roque: .
a) Solution:
AL: 1. Ke7! 0-0 2. Kf6 Dxd6#
NL: 1. Td8 a8=D 2. Kf8 Dxd8#
Try: 1. 0-0-0?? (move illegal!) 0-0 2. Kc7 Tc1#
Try: 1. 0-0-0?? (move illegal!) Kd2 2. Kc7 Tc1#

Proof s0-0-0 is illegal:

Definition: w-capture-square = The w-capture-square is square what occurs capture of white piece .

A) Logical elements in the position (LEP):
(a.1) White pawn forbidden in square f7,for preserve s0-0-0.
(a.2) captured seven white pieces.
(a.3) captured one black piece (knight).

B) Development:
(b.1) Black piece was captured in column a.
(b.2) The seven white pieces were captured for black pawns(axb cxb exd6 fxgxh gxh hxg).
(b.3) Then o wBf2 must be promoted because there is no w-capture-square in column f, but it is impossible by (a.1).

C) Conclusion: s0-0-0 is illegal, in item (a). (2009-8-27)
Paulo Roque: .
b) Solution:
AL: 1. 0-0-0 Kd2 2. Kc7 Tc1#
NL: 1. Sf7 gxf7+ 2. Kd8 f8=D#
Try: 1. 0-0-0 0-0?? (move illegal!) 2. Kc7 Tc1#
Try: 1. Ke7 0-0?? (move illegal!) 2. Kf6 Dxd6#

Proof w0-0 is illegal:

A) Logical elements in the position (LEP):
(a.1) Black pawn forbidden in square d2 or f2,for preserve w0-0.
(a.2) captured seven white pieces.
(a.3) captured one black piece.

B) Development:
(b.1) Black piece was captured in column a.
(b.2) Then is necessary promotion de black pawn, because capture de black pawn-a is impossible (implies that the white pieces were captured cxb e7xd6xc5xb4 fxgxh gxh hxg = 8 captures , impossible by (a.2)).
(b.3) Then (axb cxb fxgxh gxh hxg=six captures) therefore the pawn-e7 was promoted in d1 or f1, but is impossible by (a.1).

C) Conclusion: w0-0 is illegal, in item (b). (2009-8-27)
Paulo Roque: See the solution published in Die Schwalbe 52 08/1978, p.293 and 294. (2009-9-1)
comment
Keywords: Castling (wksg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
21 - P0000653
Eliahu Fasher
2311 Die Schwalbe 48 12/1977
P0000653
(12+14) cooked
h#2 (wer?)

Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
22 - P0000660
Lothar Finzer
2367 Die Schwalbe 49 02/1978
nach L. Garaza
P0000660
(8+14)
h#1
Duplex
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2003-10-21 more...
23 - P0000661
Luis Alberto Garaza
2368 Die Schwalbe 49 02/1978
P0000661
(7+11)
1) h#2
2) nach Schlüssel von 1): #2 durch Schwarz
1) 1. d4xe3ep cxd3 2. Sb2 0-0# (nicht 2. ... Tf1#, weil nur 0-0 den einleitenden e.p.-Schlag rechtfertigt)
2) 1. Ta1 cxd3 2. Sc3#
1. Ta1 Tf1+ 2. Sf2#
play all play one stop play next play all
Mario Richter: Correct stipulation for 2):
Nach dem Schlüssel von 1): Schwarz zieht und setzt in 2 Zuegen matt.
(After the key of 1): Black begins and mates in 2 moves.)

Solution:
1)
If White can still castle, his last move was Pe2-e4.
(bBf8 was not captured by wPawns, wPawns h5+h4 captured at least 3 times, so wPe4 cannot come from f3).

So Black starts with
1.d4xe3 e.p.
followed by
1. ... c2xd3 2.Nb2 0-0!# (not 2. ... Rf1?#, since only the castling justifies the e.p. capture).

2)
In the position after the key of 1), i.e. after 1.d4xe3 e.p., white 0-0 is definitively illegal, so White has no defense against 1.Ra1 c2xd3/Rf1+ 2.Nc3/Nf2# (2009-4-19)
comment
Keywords: a posteriori (AP), Castling (wk), Twin by continuation after key, Cant Castler
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2012-1-14 more...
24 - P0000669
Roman Fedorovich (Zalokotsky)
Evgeny Sorokin

2804 Land og Folk 04/03/1978
P0000669
(3+8)
h#3
1. hxg3ep 0-0 2. Sd3 Td1 3. Se5 Td4#
play all play one stop play next play all
Originalquelle?
comment
Keywords: Castling (wk), a posteriori (AP), En passant as key
Genre: h#, Retro
Reprints: 2427 Die Schwalbe 50 04/1978
Input: Gerd Wilts, 1995-6-3
25 - P0000674
Leonid M. Borodatow
2475 Die Schwalbe 51 06/1978
P0000674
(12+11) cooked
h#3
Keywords: Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
26 - P0000681
Leonid M. Borodatow
2528 Die Schwalbe 52 08/1978
P0000681
(10+9)
h#2
Weiß zieht an
Henrik Juel: 1.Qxf5 Kd8 2.Qf8#, not 1.exf6ep 0-0-0? 2.Qxc7 (2003-8-18)
comment
Keywords: Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
27 - P0000688
Klaus Wenda
2584 Die Schwalbe 53 10/1978
P0000688
(6+16)
h#2
b) sLe3 nach g1
a) 1. 0-0-0 a7 2. Sd5 a8=D#
b) 1. cxd3ep+ Kxb4 2. Lg8 hxg8=D#
play all play one stop play next play all
Keywords: En passant as key, Castling (sg), Promotion (D), Valladao Task
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2013-11-27 more...
28 - P0000760
André Hazebrouck
1120 Die Schwalbe 23 10/1973
P0000760
(9+10)
h#2 (AP)
1. bxc3ep Sa6 2. 0-0-0 Tc4#
play all play one stop play next play all
Henrik Juel: -1.c2 c5xLb4 -2.Lc3 c6 -3.Lb2 c7 -4.Lc1 a6! -5.b2 b2xDSa2 etc. White captured sDTSS by fxexd, gxfxe, allowing Black to capture f7xPe6xPd5 etc. (2003-12-18)
comment
Keywords: En passant as key, Castling (sg), a posteriori (AP)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-6-5 more...
29 - P0000765
André Hazebrouck
1161 Die Schwalbe 24 12/1973
2. ehrende Erwähnung
P0000765
(11+13)
h#3
1. dxc3ep 0-0-0 2. 0-0-0 dxc3 3. Kb8 Txd8#
play all play one stop play next play all
Henrik Juel: -1.c2 e5xLd4 -2.Lb2 e6 -3.Lc1 h7 -4.b2 b3xa2 etc. (2003-12-18)
comment
Keywords: Castling (wgsg), a posteriori (AP), En passant as key
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-6-5 more...
30 - P0000771
Lothar Finzer
1371 Die Schwalbe 29 10/1974
1. ehrende Erwähnung
P0000771
(7+12)
1) s#2
2) h#2
hans: It all depends on last moves, c7-c6 and d4-d5
1) Last move: c7-c6 makes castling illegal (wKa8!) so, 1. Dc7 (2. De7 KxD#)
2) Last move: d4-d5 makes castling legal, so, 1. 0-0+ Dd8 2. Kh8 DxT# (2013-2-13)
Henrik Juel: In part 1), what if last move was d7xc6?
Then La6 is [Pg7] promoted via g2 on f1 or h1, and all black captures were made by pawns; hence [Pg2] must have promoted on f8 via f7 (the white captures being axbxa, gxf, and [Lc8] on c8), making castling illegal.
So Hans' solution is correct (2013-2-13)
comment
Keywords: Castling (sk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-10-25 more...
31 - P0000777
Leonid M. Borodatow
1424 Die Schwalbe 30 12/1974
P0000777
(12+10)
h#2,5
Weiß zieht an
Henrik Juel: The stipulation should probably read h#2.5: 1.exf6ep 0-0-0 2.Bxf4 Rd7 3.a8Q# (2003-8-18)
comment
Keywords: Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2003-9-6 more...
32 - P0000804
Adamas
1691 Die Schwalbe 36 12/1975
P0000804
(4+10)
h#2 RV pRA
Henrik Juel: If last move was c2-c4, White may not castle, because d2-d1=L has happened, so Ke1 has moved: 1.dxc3ep Txh4 2.c2 Ta4#
If last move was b3xc4 or c3-c4: 1.Da1 0-0 2.Lxe2 Txa1#
(No solution if last move was made with Ke1 or Th1)
C+ by Popeye 4.55 (2013-8-1)
comment
Keywords: Partial Retro Analysis (PRA), Castling (wk)
Genre: h#, Retro
Reprints: (4) Die Schwalbe 86 04/1984
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-7-3 more...
33 - P0000823
Frank Genenncher
1939 Die Schwalbe 41 10/1976
P0000823
(2+3)
h#5
siehe Heft!
mri: Korrekte Forderung: h#5 a)Diagram, b)wKb7, c)Ka7 I) Wieviele Lösungen? II) Welche mathematischen Zusammenhänge existieren zwischen a), b), c)?
AL: I) a) 260 b) 320 c) 200 II) a=(b+c)/2 (Anzahl in a) ist das arithmetische Mittel der Anzahlen von b) und c) ) (2007-2-14)
comment

Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-6-2 more...
34 - P0000834
Eero Valdemar Bonsdorff
85 Die Schwalbe 12/1969
P0000834
(2+3)
h#7
Wieviele Lösungen?

60 solutions.
Black plays c1=L-g5, Kc7-..-f4, e5, and White plays Kg2, a5-..-a8=D-f3.
C(5,2) x C(6,1) = 10 x 6 = 60 solutions, all ending with 6.Kf4 ... 7.e5 Df3#.
more ...
comment
Keywords: Path enumeration
Genre: h#, Mathematics
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2012-9-5 more...
35 - P0000835
Ludwig Graf
86 Die Schwalbe 12/1969
P0000835
(13+12)
h#1
1. Lxb8 Tf1# (not 1. ... 0-0?, since the bP that promoted to the bBf4 must have passed d2 or f2)
play all play one stop play next play all
Keywords: Castling (wk), Cant Castler
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2010-5-24 more...
36 - P0000839
Giuseppe Brogi
129 Die Schwalbe 02/1970
P0000839
(15+10)
h#1
1. Tf8 Ld7#
play all play one stop play next play all
Keywords: Castling (sk), Cant Castler
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
37 - P0000846
Klaus Weisert
181 Die Schwalbe 04/1970
P0000846
(3+7)
h#1
Keywords: Whose move?
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
38 - P0000879
Giuseppe Brogi
546 Die Schwalbe 10/1971
P0000879
(12+13)
h#2
b) wSa1
a) 1. Kf8 0-0 2. Te8 Ld4#
b) 1. Sc4 La7 2. 0-0-0 Se7#
play all play one stop play next play all
Keywords: Cant Castler, Castling (wksg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
39 - P0000881
Nicolae A. Dragan
2343 Revista Romana de Sah 07/1968
P0000881
(8+14)
h#3
1. cxd3ep e3 2. Tg6 Lxg3 3. Kd5 Lf3#
play all play one stop play next play all
Wurde in der Schwalbe als Urdruck veröffentlicht!
comment
Keywords: En passant as key, Promotion (l)
Genre: h#, Retro
Reprints: 591 Die Schwalbe 12/1971
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-6-1 more...
40 - P0000883
Giuseppe Brogi
593 Die Schwalbe 12/1971
P0000883
(9+13)
h#2
b) -Bc2
a) 1. f4 Lxh7 2. Td8 Lg6#
b) 1. 0-0-0 Ld3 2. Lb8 La6#
play all play one stop play next play all
Keywords: Cant Castler, Castling (sg), Promotion (L)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
41 - P0000889
Giuseppe Brogi
639 Die Schwalbe 02/1972
P0000889
(9+10)
h#2
b) -sBc4
a) 1. Tb7 axb7 2. Lb4 bxa8=D#
b) 1. Tc7 a7 2. 0-0-0 a8=D#
play all play one stop play next play all
Keywords: Cant Castler, Castling (sg), Promotion (D)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
42 - P0000892
Klaus Wenda
688 Die Schwalbe 04/1972
P0000892
(7+13)
h#3*
*) 1. ... 0-0-0 2. 0-0 Tg1 3. Sh8 Txg7#
1) 1. Kf8 0-0-0 2. Kg8 Tg1 3. Sf8 Txg7#
play all play one stop play next play all
Keywords: Castling (wgsk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
43 - P0000899
Giuseppe Brogi
743 Die Schwalbe 06/1972
P0000899
(8+15) cooked
h#2
b) wSa1
Mario Richter: (a) Because of bRh2 w0-0 impossible.
Solution: 1.Rh2xh3 Rxh3 2.0-0 Rh8#

(b) bRh2 can return to a8 only via e8, so b0-0 impossible.
Solution: 1.Ba4 0-0 2.Rf8 Re1#

But cooks:
1.Rh2xh3 Bb4 2.Rxg3 Rxh8#
1.Nd2 Bf6 2.Rf8 Nd6# (2009-1-30)
comment
Keywords: Cant Castler, Castling (wksk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2010-5-24 more...
44 - P0000900
André Hazebrouck
744 Die Schwalbe 06/1972
P0000900
(13+13)
h#1 (wer?)
Zeroposition
a) +wBb4
b) +wBg4
c) +sBb5
d) +sBg5
Henrik Juel: The given solution doesn't belong to this problem. (2003-12-18)
comment
Keywords: Castling (wkwgsksg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2013-7-16 more...
45 - P0000906
Giuseppe Brogi
798 Die Schwalbe 08/1972
P0000906
(13+14)
h#2
b) -sBc6
a) 1. Lf8 Lc7 2. Se7 Sd6#
b) 1. 0-0 Lb8 2. Sh8 Se7#
play all play one stop play next play all
Keywords: Cant Castler, Castling (sk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
46 - P0001116
Michel Caillaud
3871 Die Schwalbe 74 04/1982
2. ehrende Erwähnung
P0001116
(13+13)
h#1
Weiße Schläge: dxc, hxgxh. Schwarze Schläge: axb, exf, f4xLe3.
R: 1. h3-h2 g3xSh4 2. Sf3-h4 h2xBg3 3. Se5-f3 Sb2-a4 4. Sf3-e5 Sd3-b2 5. Se5-f3 Sf4-d3 6. Sf3-e5 Sg6-f4 7. Se5-f3 Sf8-g6 8. Sf3-e5 Sd7-f8 9. Se5-f3 Sb8-d7 10. Sf3-e5 Lb3-a2 11. Se5-f3 Tg7-f7 12. Sf7-e5+ Tg4-g7 13. h4-h3 Tf4-g4 14. h5-h4 Tf1-f4 15. h6-h5 Ta1-f1 16. g4-g3 Ta8-a1 17. g5-g4 a7-a8=T 18. g6-g5 a6-a7 19. g7-g6 a5-a6 20. a6xTb5 Tb4-b5 21. a7-a6 Tb5-c5

1. Rxc4 Re5# Not 1. Txb6 Sxb6#
play all play one stop play next play all
Henrik Juel: The retroplay shows that White has the move, so interpreting the stipulation as 'h#1.0 (who?)', the solution is 1.Rxc4 Re5# (2003-4-10)
comment
Keywords: Whose move?, Promotion, Retro Opposition
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Yoav Ben-Zvi, 2018-4-2 more...
47 - P0001117
Michel Caillaud
3872 Die Schwalbe 74 04/1982
12. Lob
P0001117
(11+12)
h#2
b) sBh7 nach h6
a) 1. 0-0-0? 1. Kf7 Sxh7 2. Ke6 Sg5#
b) 1. 0-0-0 Sg6 2. Lb8 Sxe7#

Weiße Schläge: h2xg3, gxfxe, sLf8. Schwarze Schläge: a7xb6xc5; fxexdxc1=L.
R: 1. Ke3-e4 Sd6-b7 2. h2xDg3 Dg2-g3+ 3. Kd2-e3 Db7-g2 4. Ke1-d2 Dc8-b7 5. e4-e5 Dd8-c8 6. f3xLe4 Lb7-e4 7. Kf1-e1 Lc8-b7 8. Ke1-f1 b7-b6 9. Kf1-e1 Lb6-a7 10. ... La5-b6 11. ... Ld2-a5 12. ... Lc1-d2 13. ... d2xTc1=L 14. ... e3xTd2 15. ... e4-e3 16. ... f5xLe4
In dieser Stellung muß der wLe4 nach f1 zurückgespielt werden. Mit sBh7 kann der wLe4 nur entweder über f7 nach f1 zurück, so daß der sK bereits gezogen haben muß, oder der wLe4 kann über f5 zurück, wozu aber der sTa8 nach h8 zurückgezogen werden müsste, um f6-f5 zurücknehmen zu können.
play all play one stop play next play all
Henrik Juel: To make the retroplay plausible one should uncapture bQ early on g3 and retract it to d8. The wB could also get back to f1 via f5, but this would require retracting bRa8 to h8 before retracting bPf5, so castling is still illegal in part a). (2003-4-10)
Gerd Wilts: Hello Henrik, thank you for pointing out the inaccuracy of the solution, I will make the solution more precise soon. And thank you for adding all the other solutions! (2003-4-11)
comment
Keywords: Cant Castler, Castling (sg), Promotion (l)
Genre: h#, Retro
Computer test: Popeye C-Version 3.54 (2048 KB)
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-10-26 more...
48 - P0001127
Svetislav Janicijevic
42 Problem 1-2 07/1951
P0001127
(13+15)
h#3
1. d6 e3 2. Ld7 Ld3 3. Td8 Lxg6#
play all play one stop play next play all
Keywords: Castling (sg), Parity Argument, Cant Castler
Genre: h#, Retro
Reprints: 3 Europe Echecs 5 01/1959
Input: Gerd Wilts, 1995-6-3
49 - P0001130
Jacques de Savournin
6 Europe Echecs 8 04/1959
P0001130
(12+10)
h#2
1. Tf8 Dg4 2. Tf7 Dc8#
play all play one stop play next play all
Keywords: Cant Castler, Castling (sk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
50 - P0001144
Luigi Ceriani
20 Europe Echecs 16 12/1959
P0001144
(13+13)
h#1
1. 0-0 Dxg7# oder 1. 0-0-0 Dxc7#
Einer der beiden schwarzen Türme muß bereits gezogen haben: weiße Schläge: axb, e2xf3, f2xg3; schwarze Schläge: d7xc6, hxgxf; Umwandlung sBa7 auf a1. R: 1. Se2-g1 ... 2. Sc1-e2 ... 3. Sb3-c1 b5-b6 4. Sa1-b3 b4-b5 5. a2-a1=S b3-b4 6. a3-a2 a2xDb3 7. Dd5-b3 ... 8. Dd8-d5 ... 9. Ld2-e1 ... 10. Lg5-d2 ... 11. Le7-g5 ... 12. Lf8-e7 ... 13. e7-e6 ... 14. Le2-f1 ... 15. Ld1-e2 ... 16. Lb3-d1 ... 17. Le6-b3 ... 18. Lc8-e6 ... 19. d7xLc6 Ld5-c6 20. a4-a3 Lb3-d5 21. a5-a4 Ld1-b3 22. a6-a5 Le2-d1 23. a7-a6 Lf1-e2
play all play one stop play next play all
Keywords: Partial Retro Analysis (PRA), Castling (sksg)
Genre: h#, Retro
Reprints: 1 La Genesi delle Posizioni 1961
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2005-11-15 more...
51 - P0001148
Luigi Ceriani
24 Europe Echecs 18 02/1960
G. Leon-Martin gewidmet
P0001148
(14+11)
h#2
Weiß zieht an
Henrik Juel: White captured axb, cxb, h2xg3, and two more pawn captures to explain white Pd4 above black Pd3; Black captured bxc and e3xf2, and promoted on a1 and h1.
To release the southern cage, Black must unpromote a rook on h1, allowing the uncapture on g3 of a black knight, which screens on b1 to enable the unpromotion of the other black rook on a1.
Both Ta8 and Th8 are thus promoted pawns, and the two plays involving castling are just tries:
1... Dxd3 2.0-0? Lh7 and 1... Dxc3 2.0-0-0? Dxc7.
Solution: 1... Lf6 2.Tf8 Lc6#.
Popeye reports only those three plays, so if my retro argument is correct, the problem may be marked C+ (2012-8-15)
comment
Keywords: Cant Castler, Castling (sksg)
Genre: h#, Retro
Reprints: 7 La Genesi delle Posizioni 1961
Input: Gerd Wilts, 1995-6-3
52 - P0001149
Karl Fabel
25 Europe Echecs 18 02/1960
P0001149
(14+12)
h#1
Henrik Juel: Early in the game, a sT moved for tempo, so the castlings are mutually exclusive. 0... 0-0/0-0-0 1.Sxe7#. 7 white moves (b3xSc4, Lb3-a2, b3, La3-c5-a7) cannot be interspersed by 5 black ones (a6-a5-a4, h7xTg6xTf5). (2004-1-12)
comment
Keywords: Partial Retro Analysis (PRA), Castling (sksg)
Genre: h#, Retro
Reprints: 1808 Problem 73-78 06/1961
Die Schwalbe 9 06/1971
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-7-3 more...
53 - P0001166
Charles Wermelinger
39 Europe Echecs 26 10/1960
P0001166
(7+14)
h#2
1. Sf7 Tb1 2. 0-0-0 Tc4#
1. Sd7 Th1 2. 0-0 Tg4#
play all play one stop play next play all
Keywords: Partial Retro Analysis (PRA), Castling (sksg), Symmetrical position
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-7-3 more...
54 - P0001174
Charles Wermelinger
47 Europe Echecs 30 02/1961
P0001174
(8+15)
h#2
1. gxf3ep Lxf7 2. Td5 Lg6#
play all play one stop play next play all
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2001-2-19 more...
55 - P0001191
Leon Loewenton
64 Europe Echecs 38 10/1961
P0001191
(15+14) C+
h#2
b) wSd3 nach e1
a) 1. Kd8 Se5 2. Te8 Sxf7#
b) 1. 0-0 Sd5 2. Sh8 Sxe7#
play all play one stop play next play all
Originalquelle?

nicht sicher, ob Zwilling b) auch schon im Original.
Artikel von Petrovici zum "Thema Than" 03/2016 gibt als Originalquelle an: "Europe Echecs 10/1951"
hans: Counting problem
1. Kd8 Se5 2. Te8 Sxf7# !!
1. 0-0 Sd5 2. Sh8 Sxe7# ??
Black needs a tempo to get on move, and the only piece to do that is Th8, so 0-0 is illegal. (2010-6-20)
Mario Richter: The term usually used to describe this kind of problems is "Parity problem". The bRh8 might have been on h8 all the time, since the tempo move might also have been made by the black Queen, but in this case, the bK must have already moved, thereby losing the right to castle too.. (2010-6-21)
Ladislav Packa: You both are right. Black would be in this position made an uneven number moves.
This can be achieved by using Rook moves (eg Rg8-f8-h8), or by the Queen moves while she was still alive (eg Kf8-g8, then Qf8-e8-d8 and then the King back). But both possibilities preventing black castling. (2013-10-4)
comment
Keywords: Castling (sk), Parity Argument, Cant Castler, Than theme
Genre: h#, Retro
Computer test: rawbats
Reprints: 787 Themes-64 10-12/1961
(7) diagrammes 112 01-03/1995
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2018-3-22 more...
56 - P0001198
Tivadar Kardos
1807 Problem 73-78 06/1961
P0001198
(8+15) C+
h#2
Die schwarze 0-0-0 ist nicht möglich, da der wBa2 sich auf a8 umgewandelt hat.
1. Dxc2? Tc1 2. 0-0-0 Txc2#
1. Sd7 0-0-0 2. 0-0 Tg1#
play all play one stop play next play all
Keywords: Cant Castler, Castling (wgsksg)
Genre: h#, Retro
Computer test: Popeye C-Version 3.54 (2048 KB)
Reprints: 71 Europe Echecs 41 01/1962
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-10-26 more...
57 - P0001202
Drago Biscan
75 Europe Echecs 44 04/1962
P0001202
(12+8) cooked
h#3
1. Txe3 0-0?
1. Txe3 0-0-0?
1. Tb4 axb4 2. Kd7 Td1+ 3. Kc6 Lf3#
Die weißen Rochaden sind nicht mögliich, da sich der sBe7 auf d1 oder f1 umgewandelt haben muß.
play all play one stop play next play all
Keywords: Castling (wkwg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
58 - P0001221

94 Europe Echecs 51 03/1963
P0001221
(6+12)
h#2
1. Lf3 0-0? 2. Kg3 Txf3#
play all play one stop play next play all
klären: Autor?
comment
Keywords: Cant Castler, Castling (wk)
Genre: h#, Retro
Computer test: Popeye C-Version 3.54 (2048 KB)
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-9-10 more...
59 - P0001223
Drago Biscan
96v Europe Echecs 51 03/1963
P0001223
(11+11)
h#3
Mario Richter: I see 2 solutions here - are they both intended?
1. Lc8xh3 Le2-c4 2. Lh3-d7 Th1xh6 3. Te4-e7 Th6-h8#
1. Te4xe3 O-O-O 2. Te3-f3 Th1-e1 3. Tf3-f8 Le2-h5#
(Try: 1. Sb7-d8 O-O?? 2. Te4xe3 Ta1-e1 3. Te3-c3 Le2-b5#, but 0-0 is illegal) (2011-9-10)
comment
Keywords: Cant Castler, Castling (wkwg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
60 - P0001231
Eliahu Fasher
104 Europe Echecs 55/56 07/1963
P0001231
(13+8) cooked
h#2
1) 1. Sg4 0-0+ 2. Kd2 Dxd3#

NL:
1. dxc2 Dxc3 2. Sf1 Da1#
play all play one stop play next play all
hans: The solution is illegal for White can't provide 0-0! Le6 is pawn h or fxg2xf1/h1 and for those 2 captures we need s and t. The NL: is correct but the problem is eventhough incorrect for there is not a forcing second black move. (2010-6-22)
comment
Keywords: Castling (wk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
61 - P0001240
Charles Wermelinger
113 Europe Echecs 65 04/1964
P0001240
(15+6)
h#2
1. fxg3ep Lxg3+ 2. e7-e5 fxe6ep#
play all play one stop play next play all
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2001-2-19 more...
62 - P0001242
Luis Alberto Garaza
115 Europe Echecs 67/68 08/1964
P0001242
(15+13) C+
h#2
1. Tf8 Se6 2. Tf7 Sxc7#
play all play one stop play next play all
Mario Richter: With a white Queen on c1 there is no parity argument.
So perhaps a white Bishop should be on c1? (2009-4-9)
Henrik Juel: Yes, with wDc1 replaced by wLc1, the number of white moves done is even. If sK and sTh8 never moved, the number of black moves done is also even, implying that White has the move. But the stipulation says that Black has the move, so the castling is illegal, and 1.0-0?? Sxf6+ 2.Kh8 Sg6 is a try, not a cook. (2009-4-10)
comment
Keywords: Cant Castler, Castling (sk), Parity Argument
Genre: h#, Retro
Computer test: Popeye C-Version 3.42 (1024 KB)
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2014-12-18 more...
63 - P0001247
Vitaly Halberstadt
Camil Seneca

Budapest-Paris 1938
7. -8. Platz
(1. Platz!?)
P0001247
(10+10)
h#3*
* 1. ... 0-0#
1. axb2 Th5 2. b1=T Lxa1 3. Txc5 Txc5#
play all play one stop play next play all
Keywords: Cant Castler, Castling (wk), Promotion (t)
Genre: h#, Retro
Reprints: La Strategie 1939
120 Europe Echecs 70 10/1964
(9) diagrammes 112 01-03/1995
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2017-4-21 more...
64 - P0001263
Luigi Ceriani
135 Europe Echecs 78 06/1965
P0001263
(15+11)
h#2
1. bxa5 Sb6 2. axb4 Ta8#
play all play one stop play next play all
Keywords: Castling (sk), Cant Castler, Promotion
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
65 - P0001264
Matti Arvo Myllyniemi
136 Europe Echecs 78 06/1965
P0001264
(6+14)
h#2
1. bxc3ep? Lxb6+ 2. c5 dxc6ep#
1. b5 Lxb4 2. bxc5 Sb5#
R: 1. Kg3xBf3 gxf3ep
play all play one stop play next play all
Keywords: En passant, En passant as key
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
66 - P0001267
Tomislav Petrovic
(IV) Problem 37-40 09/1957
2. Preis
P0001267
(12+11)
h#2
1. cxb3ep Kxd4 2. f3 Kxc5#
play all play one stop play next play all
Henrik Juel: -1.b2 Ka5xSa4 -2.Sc3 etc. (2004-9-9)
comment
Keywords: En passant as key
Genre: h#, Retro
Reprints: Problem 61-64 07/1959
139 Europe Echecs 82 10/1965
Input: Gerd Wilts, 1995-6-3
67 - P0001280
André Hazebrouck
152 Europe Echecs 88 04/1966
P0001280
(11+12)
h#3
Henrik Juel: The castlings are mutually exclusive (c2xb1=L or d2-d1=L). 0... Kf7 1.0-0-0 Te8 2.Tf1 Sg8 3.Sg5# or 0... 0-0 1.Sh3 Kh7 2.Sf4 Tg8 3.Sg5#. But cooked by 0... Lb6 1.c5 Kf7 2.e4 Ke6 3.Sg5#. (2003-12-18)
comment
Keywords: Castling (wgsk), Castling, mutual exclusive, Promotion (l)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-6-5 more...
68 - P0001291
André Hazebrouck
163 Europe Echecs 95 01/1967
2e-3. Preis ex aequo
P0001291
(14+11)
h#1
AV: ...d7xPc6 : the pawn comes from e2, either after promotion, or after double change of column.

In the 1st case, the white pawn was on d7 or f7 : no more black castle. It must take something : with axb3 and hxg3, there are 3 white captures. So, the "a" pawn or the "h" pawn must have promoted in a1 or h1. One legal white castle, but not the other.

In the 2nd case, there are 4 white captures, so the 2 black promoted rook-pawns have been captured. No legal white castle. The Lc8 was captured in b3 lately, after ...dxc6. The e2 and h2 pawns must have captured a knight, the Ph7 promoted and... one of the black rooks a8 or h8 (the Dd8 was still in prison and a S could not be replaced by ...a1=S). One legal black castle, but not the other.

Of the 4 possible castles, only one is legal.

1 ...0-0 2 Dxg7# or 1... 0-0-0 2 Dxc7# or 1 0-0-0 Ta1# or 1 0-0-0 Dxg2# without dual.

"Intéressante et rare position multiple à 4 composantes" (L. Ceriani). (2014-12-22)
comment
Keywords: Partial Retro Analysis (PRA), Castling (wkwgsksg), Castling, mutual exclusive
Genre: h#, Retro
Reprints: (21) Die Schwalbe 69 06/1981
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-6-5 more...
69 - P0001300
Luigi Ceriani
172v Europe Echecs 100 04/1967
P0001300
(12+12)
h#2
Wieviele Lösungen?
hans: captures white: [Lf8] exd3, dxc7, hxg3, black: bxLc6!, axbxc3xd2,

We can prove that castling is illegal, but that is no problem with the stipulation, for there are many solutions after 1.Tg8 gxh7 2. f6,f5,g6,g5,Txc3,Le2,Lxf3, hxg8=D/T#, or starting with one of the black moves and 2.Tg8 hxg8D/T#. I don’t think this is the idea.
e2xd3 only when Lf1 is retract, and b7xLc6, only when bD, bL and c7 are retracted. Th1 goes out over h-line, but h2-h4 cost a tempo, so h2xSg3. Therefore dxDc7 and c8=D, but we have no shield for that check. (2012-7-30)
AV: Correct stipulation : h#1,5 (wieviele Lösungen?). Only 2 : 1 gxh7 Rg8 2 hxg8Q(R)# & 1 Qh1 hxg6 2 Qxh8#. But no 1 Qh1 0-0? 2 Qxh7# because Black have already castled ! (2014-11-18)
Henrik Juel: Here is a retroplay
Retract Ke8 to g8 and Th8 to f8, f2-f3, Lf3-c1, unpromote Df1 on c8, then
-1.d6xDc7 Dd8 -2.d5 c7 -3.d4 Lb7 -4.g5 Lc8 -5.g4 c6 -6.g3 b7xLc6
Lc6 to f1, e2xSd3, etc.
Very nice retro (2014-11-18)
Henrik Juel: Lf3-c1 should be Lf3-d1, of course (2014-11-18)
comment
Keywords: Cant Castler, Non-standard material, Castling (sk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-8-10 more...
70 - P0001315
Paul Vatarescu
187 Europe Echecs 109 02/1968
P0001315
(7+15)
h#2
hans: 1. f4xg3ep Kh1xg1 2. Te4-g4 Sh2xf3#
R: -1. g2-g4 Td4-e4 -2. Sg4-h2 Tg3-h3+ etc.
wCap: axb3,
sCap: bxcxdxexf, cxdxexf, hxgxf, (2013-2-5)
Ladislav Packa: Ist wLc1 erforderlich? (2013-2-5)
Mario Richter: Ja, der wLc1 ist notwendig, weil sonst auch a2xb3 als letzter weißer Zug möglich wäre. (2013-2-5)
Ladislav Packa: Ich habe mich falsch ausgesprochen: wozu sind auch wBBb3, b2, d2, oder mehrere sSteine? Ich sehe kein Grund fuer ihre Existenz... (2013-2-5)
comment
Keywords: En passant, En passant as key
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2013-2-5 more...
71 - P0001318
Paul Vatarescu
190 Europe Echecs 111 04/1968
P0001318
(11+10) cooked
h#3
Keywords: Cant Castler, Castling (wk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2002-6-9 more...
72 - P0001319
André Hazebrouck
191 Europe Echecs 111 04/1968
2. ehrende Erwähnung
P0001319
(11+12)
h#3
1) 1. 0-0! Tf1! (0-0?) 2. Kh7 Tf4 3. Kh6 Txh4#
2) 1. e5 0-0! 2. Ke7 Td1 3. Kd6 Lb4#
play all play one stop play next play all
AV: L'hypothèse du roque noir légal conduit (en évitant...d2+ ou ...f2+) à la promotion en Cc1 du PNg et donc à ...Cd3+.

Et le roque blanc légal implique, si l'on ne touche pas au RN, cxTb3 et ...c1T-h8.

Si un roque est légal, l'autre ne l'est pas (subordination des roques). Il n'y a pas 2 solutions, il y a ou bien l'une, ou bien l'autre. (2014-12-23)
more ...
comment
Keywords: Castling (wksk), Castling, mutual exclusive
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2014-12-24 more...
73 - P0001339
Thomas R. Dawson
390/1 Magyar Sakkvilag 07/1934
1. Preis
P0001339
(6+16)
h#2
b) alles eine Reihe nach unten
a) 1. dxe3ep Txa4+ 2. Kg5 Tg4#
b) 1. cxb3ep+ Kxb6 2. Le2 Txf4#
play all play one stop play next play all
Keywords: En passant as key, Twin by board shift
Genre: h#, Retro
Reprints: (XVI) Problem 37-40 09/1956
211 Europe Echecs 122 03/1969
(16) diagrammes 112 01-03/1995
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1999-4-4 more...
74 - P0001345
F. ben Galuth
219 Europe Echecs 126 07/1969
P0001345
(10+10)
h#2
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
75 - P0001346
Paul Vatarescu
220 Europe Echecs 126 07/1969
P0001346
(10+14)
h#2
Weiß zieht an
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
76 - P0001361
Vladimir Korolkov
(16) Problem 69-72 07/1960
P0001361
(12+14) cooked
h#3
AB: cooked with lines ending 3Bxb6#. Repair by putting bRa7-a8 bPa6-a7. (2001-12-4)
Henrik Juel: 0... 0-0 1.Tf1! Txf2 2.Txf2 Kh8 3.Tf8#. (2004-1-2)
comment
Keywords: Castling (wksk), Castling, mutual exclusive, Parity Argument
Genre: h#, Retro
Reprints: 235 Europe Echecs 140/141 10/1970
(28) Problem 144-147 12/1971
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2014-12-18 more...
77 - P0001377
Giuseppe Brogi
251 Europe Echecs 154 10/1971
P0001377
(10+12)
h#2
b) wBd4 nach a4
Keywords: Cant Castler, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
78 - P0001378
Janko Furman
252 Europe Echecs 154 10/1971
2. ehrende Erwähnung
P0001378
(6+15)
h#2
b) sSd4
Keywords: Cant Castler, En passant, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-9 more...
79 - P0001381
Giuseppe Brogi
255 Europe Echecs 157 01/1972
P0001381
(11+11)
h#2
b) sLg6
Keywords: Cant Castler, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-9 more...
80 - P0001385
Giuseppe Brogi
259 Europe Echecs 160 04/1972
P0001385
(6+12)
h#2
b) wBg2 nach g5
Keywords: Cant Castler, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-9 more...
81 - P0001390
George A. Teodoru
264 Europe Echecs 163 07/1972
Dieter, Felix und Michael gewidmet
P0001390
(13+14)
h#3
3 Lösungen
Keywords: Castling (wk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-6-2 more...
82 - P0001396
Paul Vatarescu
270 Europe Echecs 174 05/1973
P0001396
(10+13)
h#2
Keywords: En passant
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
83 - P0001397
Giuseppe Brogi
271 Europe Echecs 174 05/1973
P0001397
(10+9)
h#2
b) wBe5 nach d4
Keywords: Cant Castler, Castling (wg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-15 more...
84 - P0001400
Giuseppe Brogi
274 Europe Echecs 177/178 10/1973
P0001400
(13+10)
h#2
b) sBh7 nach g7
AV: Nebenlösung : 1 Td8 (Ld8) Lg7 2 e5 Lf7# . (2005-6-26)
comment
Keywords: Cant Castler, Castling (wgsg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1997-1-9 more...
85 - P0001401
Luis Alberto Garaza
275 Europe Echecs 177/178 10/1973
Lob
P0001401
(11+10)
h#1 (wer?)
hans: 1. .... 0-0-0 2.Ta8# (1.0-0-0 Ta1#??)
White long castling is illegal, Rc2 can’t get back over g-line. Bg6 is promoted a-pawn on b1 and cant get back over h-line, but over f-e-line. White captures: axb3, cxd3, exf3xg4, gxf3, Bc8, Black captures: axb1 cxd6, exLd5, gxh2, Bc1. (2012-5-19)
comment
Keywords: Cant Castler, Castling (wgsg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
86 - P0001404
Jean Roche
278 Europe Echecs 182 01/1974
Lob
P0001404
(7+13) C+
h#2
if white can castle: 1. Td7 0-0-0 2. Kd8 Dxd7#
if black can castle: 1. Td7 Txa7 2. 0-0-0 Ta8#
play all play one stop play next play all
NN: The above is basically two parts of a single solution depending on the history of the game and not two different solutions.

Proof of why castling rights are mutually exclusive: Let's assume black CAN castle. Now, the bPs piled up on h-file implies six captures of white units and these can only be wRBBNN & wPe2. Because all other possibilities involve promotion of wPs on d8/e8/f8 followed by their capture by bPs, interfering with black's castling right. Next, we observe that wRh1 getting captured by bPs implies one of the following two things: (i) wKe1 moved to let wRh1 out of the pawn-chain or (ii) wPg2,h2 cross-captured on h3,g3 respectively to facilitate the escape of wRh1. Furthermore, option (ii) necessitates bPd7 to be promoted to d1 so that it can be captured by wPs, implying wKe1 had to move anyway to let bPd7 promote.
Thus, Black can castle implies wKe1 moved and white can't castle. Contrapositively, white can castle will imply that black can't. (2018-11-29)
Henrik Juel: Nice analysis, Satanick (2018-11-29)
NN: Thanks Henrik Juel. Hope there are no mistakes. (2018-11-29)
Yoav Ben-Zvi: The claim that retaining Black castling requires an uncapture of a wR by Black's h-file pawns is not accurate. Consider the case that all 6 of these bP uncaptures are of wBs and wNs. In this case 2 of the uncaptured White pieces unpromote. Both could be unpromoted (on f8 or d8) by an uncapture from e7. This scenario requires a third wP uncapture (on the e file) so one of White's uncaptures is accounted for by [bPd7]. The direct uncapture of [bPd7] (on the e file) or its unpromotion without stepping on d2 requires this pawn to uncapture the wR, confirming the conclusion of mutually exclusive castling. A similar argument works for the case that the Black h file pawns play bPe7xwPf6 along with 5 uncaptures of WNs and wBs. (2018-12-3)
Henrik Juel: Now we can test
C+ by Popeye 4.61 (and analysis)
The main content is the retro analysis, of course, but as a helpmate problem the repeated 1.Td7 detracts (2018-12-3)
more ...
comment
Keywords: Partial Retro Analysis (PRA), Castling (wgsg), Castling, mutual exclusive
Genre: h#, Retro
Computer test: Popeye 4.61
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2018-12-3 more...
87 - P0001418
Janko Furman
292 Europe Echecs 194 01/1975
2. ehrende Erwähnung
P0001418
(14+14)
1) Löse die Stellung auf!
2) h#1 (wer?)
Henrik Juel: 1) There are two ways to release the position.
a. Retract 1... Bh1 2.g3 h2-h1=B 3.g2 h3 4.d4 h4 5.d3 h5 6.d2 h6 7.h5:Qg6 Qb1 8.h4 Qa1 9.h3 a2-a1=Q 10.h2 a3 11.c3 a4 12.c2 a5 13.b3 a7 14.a6:Bb7 etc.
b. Retract 1... Rh8 2.g3 Nf8 3.g2 Rh1 4.d4 Ra1 5.d3 a2-a1=R 6.d2 a3 7.c3 a4 8.c2 a5 9.b3 a7 10.a6:Nb7 etc.
2) White has the move, so 1.N:b6 Na6#, not 0... e5? 1.cR:d6. (2010-4-10)
comment
Keywords: Allumwandlung, Whose move?
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: hpr, 1999-4-24 more...
88 - P0001420
Branko Koludrovic
294 Europe Echecs 197 04/1975
1. ehrende Erwähnung
P0001420
(13+12) C+
h#3*
1. ... cxd6ep 2. 0-0-0 0-0-0 3. Kd7 Sa7#
1. De7 c6 2. Th8 c7 3. Tf8 Sd6#
play all play one stop play next play all
Keywords: a posteriori (AP), En passant, Castling (wgsg)
Genre: h#, Retro
Computer test: Popeye C-Version 3.52 (2048 KB)
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-10-26 more...
89 - P0001425
Karl Fabel
(III) Problem 37-40 09/1956
P0001425
(2+4) C+
h#2*
*) 1. ... 0-0 2. d2 Tf8#
1) 1. Kg8 Tf1 2. Kh8 Tf8#
play all play one stop play next play all

Duplicate Diagram: P0003615

Keywords: Cant Castler, Castling (wk), anticipated (P0003615)
Genre: h#, Retro
Computer test: Popeye C-Version 3.52 (2048 KB)
Reprints: 299 Europe Echecs 200 07/1975
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2004-10-26 more...
90 - P0001431
Luis Alberto Garaza
305 Europe Echecs 205 01/1976
3. Lob
P0001431
(13+11)
h#2
2 Lösungen
hans: There are 3 solutions
1. Dxh2 Dxh2 2. 0-0-0 Sb6#
1. Td8 0-0-0 2. g3 De3#
1. 0-0-0 0-0-0 2. g3 Dc5#
It is obvious that white castling is illegal (Tc2?), so only 1 solution is correct.
But the keyword says “mutual exclusive’, which I don’t understand (2012-5-22)
Henrik Juel: White castling is actually legal, Hans, with White captures, e.g., b2xLc3, c2xSb3, e2xPd3xPc4xTb5; but this requires that [Th8] got out, which could not happen with g7xh6, h7xg6 (requiring four black captures), so Ke8 has moved. Thus, if White may castle, Black may not; conversely, if Black may castle, White may not, because Ke1 has moved to let Tc2 in. Exactly this is the content of the expression 'the castlings are mutually exclusive'.
The first two of your solutions work, the third does not. (2012-5-22)
hans: thank you,Henrik, I forgot (once again) cross-capture. (2012-5-22)
comment
Keywords: Castling (wgsg), Castling, mutual exclusive
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 1996-6-1 more...
91 - P0001433
Luis Alberto Garaza
307v Europe Echecs 211 07/1976
P0001433
(5+10)
h#2
Keywords: Cant Castler, Castling (wk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
92 - P0001450
Henri Nouguier
324 Europe Echecs 223 07/1977
P0001450
(13+3)
h#1
hans: 1. Th2xf2 De1xf2#!
1. Th2xh3 0-0#? (Castling illegal)

R: -1. Kf1xSe1 Sg2-e1 -2. Ke1-f1 Sf4-g2+ -3. Tg1-h1 Sd5-f4 -4. Tf1-g1 Se3-d5 -5. Tg1-f1 Sf1-e3 -6. Tg1-h1 Tg2-h2 -7. Th2-h1-g1 Tg1-g2 -8. Th1-h2 g2-g1=T -9 h2-h3 h3xSg2 (2010-6-26)
comment
Keywords: Cant Castler, Castling (wk)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
93 - P0001453
Luis Alberto Garaza
327v Europe Echecs 225/226 10/1977
P0001453
(11+14)
h#1
Keywords: En passant, Castling (wk), a posteriori (AP)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
94 - P0001472
Bernard Rothmann
346 Europe Echecs 244 04/1979
P0001472
(2+8) cooked
h#5
poisson d'avril!
comment
Keywords: Joke, Illegal position
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Mario Richter, 2010-7-10 more...
95 - P0001502
P. Debreu
375 Europe Echecs 261/262 09/1980
Lob
P0001502
(9+14)
h#1
AV: 1 Cd8 Dg8# (et non 1 0-0-0? Db7#). Le roque est illégal car la Ta8 est en réalité la Tour-Roi ! Le Fa7 provient de la promotion du Pa7 en e1 ou g1, antérieure au coup ...b7-b6, lui-même antérieur à b2-b3 (le Fc1 sera pris plus tard en g5 par le PNh). La prise ...exPf2 impliquerait que la Dd1 ait disparu, capturée à domicile. Le pion f2 a bien été pris, mais en e3 après f2xTe3, à un moment où la Th8 était encore enfermée. C'était donc la Tour-Dame. Et la Dd5 vient de h8. (2005-6-26)
comment
Keywords: Cant Castler, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
96 - P0001511
Michel Caillaud
383 Europe Echecs 268 04/1981
P0001511
(12+13)
h#2 (AP, RV)
Schwarz Schläge: fxe; gxfxe. Weiße Schläge: gxf; hxgxh. R: 1. a2-a4 c7-c6 2. Ta3-b3 d7-d6 3. Ta6-a3 e7-e6 4. Tf6-a6 b5-b4 5. Tf7-f6 b6-b5 6. Sh8-g6
1. bxa3ep (bxc3ep) Dxe4 2. 0-0-0 Dxc6#
oder 1. exd3ep Txb3 2. 0-0-0 Dxc6#
play all play one stop play next play all
Keywords: En passant, Partial Retro Analysis (PRA), Castling (sg), a posteriori (AP)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Gerd Wilts, 2001-2-19 more...
97 - P0001517
Michel Caillaud
389v Europe Echecs 271 07/1981
Lob
P0001517
(12+9)
h#2
Henrik Juel: Solution: 1.g5 hxg8=QR 2.gxf4 Kd2#, not 2... 0-0-0??.
Only if White had the move would he be entitled to castle: -1... h5 -2.Sf2 h6 -3.Sd3 Kh1 -4... Bg1 -5... Kh2 .. -8... Kh5 -9... Bh2 -10.Sf2 Bg3 -11.h2 Bh4 -12.Sd3 Bf6 etc. (2003-3-31)
Yoav Ben-Zvi: The need for a tempo move (by WK or WR) arises because WN needs to stand on f2 when Black retracts Bg3-h2. I dont think this is Retro opposition because the role of the WN is positive (Retro Shield) rather than negative. (2018-4-3)
Henrik Juel: Now I notice that Ph7 is a so-callet Volet pawn (coming diagonally from c2)
The definition of Retro Opposition in the latest Album (2010-12, p.620) is:
'In a particular phase of the retro-play it can be proved which side is to play, despite there being mobile units on both sides.' (2018-4-3)
Mario Richter: The position can also be easily resolved by an early retraction of f3-f4, in this case wK had to move earlier in the game not because of RO but to let original wRook h1 out ... (2018-4-5)
Yoav Ben-Zvi: The FIDE Album Theme Index tries to save space so the definitions contain only what is deemed to be the essential core of the theme. In some cases, such as the definition for Retro Opposition, this is carried too far and an essential characteristic is left out. To see this note that the definition (given above) does not distinguish Retro Opposition from the Parity Argument theme. Unless Parity is considered to be a particular type of Retro Opposition, the FIDE Album definition must be rejected.
I think that any satisfactory definition of RO will state that a thematic retraction is prevented (not enabled) by certain circumstances. If this is the case then I see no Retro Opposition here. (2018-4-9)
comment
Keywords: Cant Castler, Retro Opposition, Castling (wg), Volet Pawn
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-4-3 more...
98 - P0001561
Michel Caillaud
432 Europe Echecs 304 04/1984
Lob
P0001561
(8+13)
Kürzestes h#?
R: 1. a7-a5 e3xLf4 2. Ld6-f4 d2xTe3 3. Ta3-e3 b4-b5 4. Ta6-a3 b3-b4 5. Tc6xBa6 a5-a6 6. Tc8-c6 a4-a5 7. Tg8-c8 a3-a4 8. Lf8-d6 a2-a3 9. e7xDf6
1. ... bxa6ep 2. Txe2 axb7 3. Td2 b8=D 4. De2 Db1#
play all play one stop play next play all
AV: Solution apparente à rejeter : 1 Dc6? bxc6 2 Fd7 cxd7 3 Re1 d8D 4 Rf1 Dd1#. (2005-6-15)
comment
Keywords: En passant, Last Moves?
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: Alfred Pfeiffer, 2013-8-21 more...
99 - P0001568
Michel Caillaud
438 Europe Echecs 310 10/1984
Lob
P0001568
(12+13)
h#1,5*
* 1. ... ... 2. 0-0-0 Tb8#
1. ... d6 2. Lf7 (nicht 0-0-0?) Tb8#
play all play one stop play next play all
Schlagfälle und Umwandlungen: axb, bxc, cxd, h=; dxc, exf, fxe, hxg, a=
Henrik Juel: Maybe the stipulation should be h#1: 1.0-0-0 Rb8#. The castling is preserved by -1.Bb8 Ba5 -2.Kg1 Bb6 ... -10.Kb4 Bb6 -11.Ka5 Ba7 -12.Ka6 g4 -13.Kb7 Bb6 -14.Kc6 Ba5 -15.Rb6 Ba6 etc. (2003-4-14)
Michel Caillaud: Correct stipulation : h#1,5*
Set : 1.0-0-0 Rb8#
Play : 1...d6 2.Bf7 (not 0-0-0?) Rb8# (2003-4-15)
Yoav Ben-Zvi: Release of the position without moving BK and BRa8 requires that WK retracts to c6 (to shield the BK from WBa4) via a3,b4,a5,a6,b7. When WK is retracted from a5 to a6, BB must be standing on a7 (to shield WK from BRa8) and Black must respond with retraction of BPg4-g3. This implies that, when WK is retracted from b4 to a5, BB cannot stand on a7 (as Black would then need to use his only tempo retraction too early) so it stands on b6 while WB stands on b8 (WB cannot stand on a7 as this would be a Retro-opposition preventing Black's following retraction BBa7-b6). WK does not have a triangulation available on the retro-path from h1 to b4 so the configuration of WKb4, WBb8, BBb6, BPg3 with White to play the next retraction can only be achieved, under the assumption of Black retaining castling rights, if it is Black to move in the diagram position. This means 0-0-0 is available in the set play but not in the solution (reversed because of the H#1.5 stipulation). (2018-4-5)
comment
Keywords: Cant Castler, Retro Opposition, Castling (sg)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
Last update: A.Buchanan, 2018-4-6 more...
100 - P0001594
Nikita M. Plaksin
Waleri A. Liskowez

464 Europe Echecs 331/332 07-08/1986
P0001594
(11+9)
h#2
VL: Solution:
1.d*c3 e.p. 0-0-0! 2.0-0-0! R*c3#

NOT:
1... @? 2.0-0-0 R*c3#??
1.... Sc5(b4)? 2.e5 R*a8#?? no AP-justification!

Retro tempo-play: 1.c2-c4 f7*Se6 2.Sd8-e6 h4-h3 3.Rc3-a3 h5-h4
4.Rc8-c3 h6-h5 5.Rb8-c8 c5*d4 6.a7*Bb8R! Be5-b8 7.Bd5-a2 Bg7-e5
8.Be4-d5 Bf8-g7 9.- g7-g6 10.Bh7-e4 c6-c5 11.Bg8-h7 c7-c6
12.h7*Rg8B Rh8-g8 just in time.

Both castling together imply e.p. 'a posteriori' and are necessary only
to this end.
Award: Com. (2002-4-3)
comment
Keywords: En passant, Castling (wgsg), a posteriori (AP)
Genre: h#, Retro
Input: Gerd Wilts, 1995-6-3
next 100 problems
Show statistic for complete result.

The problems of this query have been registered by the following contributors:

Gerd Wilts (100)