Die Schwalbe

56 problem(s) found in 3958 milliseconds (displaying 56 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT S='König & Turm' AND K='Prentos-Thema'] [download as LaTeX]

1 - P1000177
Gianni Donati
9989 Die Schwalbe 170 04/1998
Für den Geburtstag meiner Frau Dana
1. Lob
P1000177
(14+15) C+
BP in 12,0
1. Sc3 b5 2. Sd5 La6 3. Sxe7 Sxe7 4. e4 Sg6 5. e5 Ld6 6. e6 Kf8 7. e7 Kg8 8. e8=S Lg3 9. Sd6 Dh4 10. Sf5 Da4 11. Sd4 b4 12. Se2 Lxe2
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A.Buchanan: Solved in YouTube: https://www.youtube.com/watch?v=jtEu5g7rUVs (2022-02-17)
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Keywords: Unique Proof Game, Promotion (S), Pure Round Trip (B9), Homebase (w), Phoenix (S), Ceriani-Frolkin Theme (S), Prentos Theme (S), Tempo Loss
Genre: Retro
Computer test: (Natch 1.3 Copyright (C) 1997-1999 Pascal Wassong)
FEN: rn4kr/p1pp1ppp/6n1/8/qp6/6b1/PPPPbPPP/R1BQKBNR
Reprints: www.mathpuzzle.com
YouTube 17/02/2022
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2022-02-18 more...
2 - P1007296
Reto Aschwanden
11787 Die Schwalbe 199 02/2003
3. Preis
P1007296
(13+14) C+
BP in 19,0
1. d4 h5 2. d5 h4 3. d6 Th5 4. dxc7 d5 5. c4 Dd7 6. c5 Dh3 7. c6 Lg4 8. c8=L Sh6 9. Ld7+ Sxd7 10. c7 Sf6 11. c8=L Sh7 12. Lf5 Txf5 13. e4 0-0-0 14. e5 Td6 15. e6 Ta6 16. exf7 e5 17. b3 La3 18. f8=L Lb2 19. La3 Txa3
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Drei wUW-LL werden geschlagen, hier aber nicht durch Bauern!
Henrik Juel: Natch 3.1 found the solution but did not finish testing in more than an hour (2018-12-18)
Henrik Juel: Stelvio 2.0 is slightly faster than Stelvio 1.14: 55 sec. (2024-02-04)
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Keywords: Ceriani-Frolkin Theme (LLL), Unique Proof Game, Prentos Theme (LLL), Promotion (LLL)
Genre: Retro
Computer test: Natch 3.3: 47min, Euclide 1.11: 30min, Stelvio 1.14: 1min20sec.
FEN: 2k5/pp4pn/7n/3ppr2/6bp/rP5q/Pb3PPP/RNBQKBNR
Reprints: feenschach 155 2004
H1-5 WCCI 2001-2004
11787 Die Schwalbe 211, p. 16, 02/2005
Input: Gerd Wilts, 2003-03-23
Last update: Reto, 2023-03-22 more...
3 - P1068641
Michel Caillaud
Moutecidis Fougiaxis Prentos Jubiläumst. 2006
1. Preis
K. Prentos 40 Jahre
P1068641
(12+12) C+
BP in 19,5
1. b4 h5 2. b5 h4 3. b6 Th5 4. bxa7 Sh6 5. axb8=T Taa5 6. d4 Tag5 7. d5 f5 8. d6 Sf7 9. dxe7 d5 10. c4 Kd7 11. e8=T Df6 12. c5 Lxc5 13. a4 Lb6 14. a5 c5 15. a6 Kc7 16. a7 Ld7 17. a8=L Lxe8 18. Ta7 Kxb8 19. Txb7+ Kxa8 20. Tb8+
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Bob Baker: C+ Stelvio 2.0 Solving time: 00:00:39 seconds (2024-02-28)
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Keywords: Unique Proof Game, Schnoebelen Theme (TTL), Anti-Pronkin (T), Prentos Theme (TTL), Ceriani-Frolkin Theme (TTL), Promotion (TTL)
Genre: Retro
Computer test: Natch 3.1 (3:58 h)
FEN: kR2b3/5np1/1b3q2/2pp1prr/7p/8/4PPPP/1NBQKBNR
Reprints: (2) StrateGems 10/2007
Input: Gerd Wilts, 2006-12-21
Last update: A.Buchanan, 2021-02-20 more...
4 - P1098713
Guy Sobrecases
Internet-Turnier 28/01/2010
3. Preis Weihnachtsturnier 2009, Retro
P1098713
(14+14) C+
BP in 9,5
2 Varianten
Immun-Schach
1. e4 b5 2. Se2 b4 3. Sec3 bxc3 4. b4
4. ... La6 5. Lb2 cxb2 6. Sa3 b1=L 7. Txb1 Lb7 8. Tb3 a6 9. Lxa6 Lc8 10. Td3
4. ... a6 5. Lb2 cxb2 6. Sa3 b1=T 7. Lxa6 Tb3! 8. Tb1 Ta7 9. Txb3 Ta8 10. Td3
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Judge Michel Caillaud: Composer succeeds in making Schnoebelen promotion less obvious, thanks to using 2 phases with 2 switchbacks as motivation. The need of a black tempo is the trick that allows differentiation of the phases (and the Schnoebelen Rook becomes an "anti-Schnoebelen" Rook!). Well done.
Sobrecases: Specific try play:

1.Sf3? b5 2.b3 b4 3.Ba3 b×a3 4.b4 Bb7 5.S×a3?? B×f3 6.Rb1 Bc6 7.e4 a6 8.B×a6 Bb7 9.Rb3 Bc8 10. Rd3

4.?a6!? 5.S×a3 Bb7 6.Rb1 B×f3?? 7.Rb3 Bc6 8.e4 Bb7 9.B×a6 Bc8 10.Rd3 (2010-04-12)
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Keywords: Unique Proof Game, Immune Chess, Schnoebelen Theme (TL), Prentos Theme, Ceriani-Frolkin Theme, Homebase (s)
Genre: Retro, Fairies
Computer test: Jacobi+
FEN: rnbqkbnr/2pppppp/B7/8/1P2P3/N2R4/P1PP1PPP/3QK2R
Input: Gerd Wilts, 2010-02-02
Last update: A.Buchanan, 2023-06-29 more...
5 - P1189023
Yaakov Mintz
6118 Phénix 194 04/2010
P1189023
(10+12) C+
BP in 9.5
1. f4 d5 2. f5 d4 3. f6 d3 4. fxe7 dxe2 5. exd8=L exd1=T+ 6. Ke2 Txc1 7. Lxc7 Txb1 8. Lg3 Txa1 9. Le1 Txe1+ 10. Kxe1
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Henrik Juel: The double CF is even double Prentos, as the promoted men are captured by officers (2018-12-29)
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Keywords: Ceriani-Frolkin Theme (Lt), Homebase (2), Unique Proof Game, Prentos Theme (Lt), Switchback (K)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 08:35:12 Stunden. (hh:mm:ss) Keine Lösung: BP 9.0.
FEN: rnb1kbnr/pp3ppp/8/8/8/8/PPPP2PP/4KBNR
Input: YM, 2011-03-03
Last update: A.Buchanan, 2023-07-11 more...
6 - P1228018
Enzo Minerva
Andrew Buchanan

Introduction to Proof Games 01/2010
EM, version AB
P1228018
(14+14) C+
Proof game in 9.0
1. e4 f5 2. Lb5 f4 3. Se2 f3 4. 0-0 fxe2 5. e5 exf1=L 6. Dg4 Lc4 7. d3 Kf7 8. Dxc4+ d5 9. exd6ep+ Le6
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Shortest known proof game showing Valladao-Monteiro (after 8.5 moves - the extra half-move is to move beyond the check, and is the only move which preserves uniqueness of the PG).
Composed for http://abrobecker.free.fr/chess/IntroductionToPGs.pdf
>>> Agreed with Enzo Minerva that this is EM v AB: 24-Dec-2014. (Original is at P1284755.)
Kevin Begley: Partially anticipated, by Enzo Minerva, Best Problems 2005 (which shows Valladao-Monteiro in as many moves, based upon the same idea). (2014-03-01)
A.Buchanan: Thanks for highlighting this, Kevin. I had searched PDB for prior art before composing this one, but Enzo's problem was (and still is) absent. I feel that my little composition does add something more. In mine, the identity-defining Ceriani-Frolkin bishop move is not a capture. And WQ has potentially three routes to its final square, including the CF promotion square, but the two duals are eliminated by the waiting move d3. So, is Enzo still active? I am thinking this partial anticipation probably a case of "AB after EM" but if Enzo is still around I would like to discuss with him out of courtesy. (2014-05-01)
Kevin Begley: Andrew, at best, I see yours as a version. (2014-05-01)
Kevin Begley: Compare to 'P1284755'. Clearly Andrew's version is better (and not only because of the extra move avoiding check in diagram -- which may be forgiven in a proofgame aiming specifically for brevity), however thematically, they are nearly indistinguishable. I leave it for Andrew and Enzo to collaboratively determine the proper credit here. (2014-05-01)
A.Buchanan: Oh for Pete's sake... there's *another*, now I look in WinChloe:
Alexeï GASPARYAN Oakham PG Tourney,
The Problemist Supplement 2009-10
1° Mention d'Honneur.
rnb2rk1/pp1p1ppp/3p4/2q5/1b6/3p4/PPP1PKPP/RNBQ1BNR
PG in 9.0
1.f3 e5 2.f4 Bb4 3.f5 Ne7 4.f6 00 5.f×e7 e4 6.e8=N Qg5 7.Nd6 c×d6 8.Kf2 Qc5+ 9.d4 e×d3ep+ (C+)
Now the date in WinChloe is wrong: what counts is the closing date for the tournament, 31-12-2009 (although the judging was only held in 07-2010, and publication was in 11-2010). Mine was published in 01-2010 (composed on 10-01-2010. I think I fold at this point, and allow Messrs. Minerva & Gasparan to duke it out, if they care. (2014-05-04)
A.Buchanan: @Kevin: and on the subject of versioning. Do you have a link to anything that gives guidelines to relative attribution. The Codex is sketchy (as usual), and I don't know where else to look. (2014-05-04)
Henrik Juel: On versioning:
When inspired by a published problem by AA to improve it, I would write 'hj after AA' if my contribution is large and 'AA, version by hj' is it is small. Of course, 'improve', 'large', and 'small' are not well defined, so it is up to the improver and the editor what to choose, and up to the judge whether an award is warranted.
In the Minerva-Gasparyan-Buchanan case the later authors surely were not inspired by the first, so here I would suggest the following possibilities: anticipated, partially anticipated, and not anticipated, again leaving the final verdict to the judge (2014-05-04)
A.Buchanan: I don't see any fundamental difference between accidental and deliberate partial anticipation. Ultimately the choice is between labeling the problem as "A,version", "A,version B" or "B, after A". I am totally ok with whatever Minerva/Gasparyan eventually determine. However, I don't think that PDB supports "A, version B" currently. (2014-05-05)
A.Buchanan: Not heard anything from Messrs Minerva or Gasparyan. I should rephrase my earlier statement as: "I don't see any fundamental difference between accidental partial anticipation, and acknowledged deliberate versioning, in terms of the set of possible final outcomes." (2014-12-24)
A.Buchanan: Resolved with Enzo :D! (See above!) (2014-12-24)
A.Buchanan: Resolved with Alexey in Facebook yesterday :D! AB: "I would like to ask you: are you ok with the current attribution of my problem?" AG: "Yes I agree." So there we are. Maybe EM & AG will conduct diplomatic negotiations at some point, but that's not my concern :) (2021-10-05)
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Keywords: Valladao Task (swwk), Unique Proof Game, Ceriani-Frolkin Theme (l), Prentos Theme (l), En passant, Castling, Promotion (l)
Genre: Retro
Computer test: Euclide 0.99
FEN: rn1q1bnr/ppp1pkpp/3Pb3/1B6/2Q5/3P4/PPP2PPP/RNB3K1
Reprints: 11 Introduction to Proof Games 03/2010
Input: Alain Brobecker, 2011-12-26
Last update: A.Buchanan, 2021-05-26 more...
7 - P1250539
Eric Pichouron
P0291 StrateGems 2011
2. ehrende Erwähnung
P1250539
(13+12) C+
BP in 20
1. a4 f5 2. a5 f4 3. a6 f3 4. axb7 fxe2 5. Sf3 exd1=L 6. La6 h5 7. d3 h4 8. Lg5 h3 9. Sbd2 hxg2 10. h4 g1=L 11. Th3 Lh2 12. Sxh2 Lf3 13. Txf3 e5 14. 0-0-0 La3 15. bxa3 e4 16. Kb2 e3 17. Kb3 e2 18. Ka4 e1=L 19. Sb3 Lb4 20. Td2 Lf8
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paul: BB Ceriani-Frolkin, B Phoenix-Pronkin (2021-07-24)
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Keywords: Unique Proof Game, Homebase (s), Prentos Theme (ll), Pronkin Theme (l)
Genre: Retro
Computer test: Euclide 1.01
FEN: rnbqkbnr/pPpp2p1/B7/6B1/K6P/PN1P1R2/2PR1P1N/8
Input: Gerd Wilts, 2012-10-03
Last update: Arnold Beine, 2021-07-25 more...
8 - P1256160
Bernd Graefrath
14448 Die Schwalbe 242 04/2010
Dem Taoisten Hilmar zum 60. Geburtstag gewidmet
P1256160
(15+11)
BP in genau 6,0
Tibetschach
1. e3 a6 2. Lxa6 bxa6[=wBa6] 3. Df3 Lb7 4. axb7 Sa6 5. bxa8=D Dxa8 6.Dxa8+ Sb8
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Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 in 6 Min. (2022-08-18)
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Keywords: Unique Proof Game, Tibetan chess, Schnoebelen Theme (D), Anti-Pronkin (D), Prentos Theme, Ceriani-Frolkin Theme
Genre: Retro, Fairies
FEN: Qn2kbnr/2pppppp/8/8/8/4P3/PPPP1PPP/RNB1K1NR
Input: Gerd Wilts, 2012-12-13
Last update: A.Buchanan, 2019-02-03 more...
9 - P1274528
Andrew Buchanan
15611 Die Schwalbe 261 06/2013
P1274528
(10+5) C+
Proof game in 12.0
1. f4 e5 2. fxe5 Sf6 3. exf6 Ld6 4. fxg7 Lxh2 5. gxh8=L Lxg1 6. Txh7 Le3 7. Txf7 Lxd2+ 8. Dxd2 a5 9. Dxa5 Kxf7 10. Dxc7 Dxh8 11. Dxc8 De8 12. Dxe8+ Kxe8
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Die Schwalbe 12/2013
MRi: "Nach dem ersten, naturgemäs schlaglosen Zug muss Weiß im Rest der Partie permanent schlagen. Dass sich gleich drei weiße Steine aktiv an dieser Fresserei beteiligen, kommt ebenso überraschend wie der Schnoebelen-Läufer auf h8, den man beim bloßen Blick auf die Endstellung wohl kaum erwartet hätte. Netter (Computer?!)-Fund im Bereich der At-Home-BPs."
HG: Siehe Kommentar zu 15609; hier mit Schnoebelen-Läufer, sK-Rückhehr und sD-Opferzug."
SBa zu 15069 und 15611: "Das dürften die ersten orthodoxen Doppelhomebase it Schnoebelenumwandungen sein. 156909 ist inbesondere weben des genialen Tempozugs Ke7, der die eigentliche Begründung der Umwandlung liefert, viel besser, die andere errinerte eher an Massakerbeweispartien, Nichesdestotrotz will das erstmal konstruiert sein.
A.Buchanan: @Mario: no computer: found by hand over the course of several evenings on a business trip to Mumbai, but I take the suspicion as a compliment! :D (2021-07-18)
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Keywords: Unique Proof Game, Homebase (2), Schnoebelen Theme (L), Switchback (k), Ceriani-Frolkin Theme (L), Prentos Theme (L)
Genre: Retro
FEN: rn2k3/1p1p4/8/8/8/8/PPP1P1P1/RNB1KB2
Input: Mario Richter, 2013-07-20
Last update: A.Buchanan, 2021-07-18 more...
10 - P1316696
Torsten Linss
11180 feenschach 213 05-06/2015
Thomas Brand gewidmet
P1316696
(2+4) C+
h#6
1. c3 Kg4 2. c2 Kf3 3. c1=T Ke2 4. d1=L+ Kd2 5. Lb3 Kxc1 6. La2 Ld4#
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Schnoebelen-sT
See P1359492 and P1359493
VL: Reprint: (1) Problemas 37, p.1232, 01/2022 (2022-01-23)
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Keywords: Schnoebelen Theme (t), Minimal, Promotion (tl), Prentos Theme (t), Ceriani-Frolkin Theme (t)
Genre: h#
Computer test: DB2013.1
FEN: 8/8/8/3p3K/2p5/4B3/3p4/k7
Input: TLi, 2016-02-04
Last update: A.Buchanan, 2021-05-03 more...
11 - P1332546
Nicolas Dupont
528 Julias Fairies 16/04/2014
1st Prize
P1332546
(14+14)
BP in 16
Disparate Steine
1. d4 Sf6 2. d5 Sh5 3. Dd4 a5 4. Sf3 Ta6 5. d6 Tb6 6. dxc7 Sa6 7. Ld2 d5 8. Sh4 Lg4 9. c8=D Lxe2 10. Kxe2 e5 11. Kf3 Dd7 12. Lb5+ Ke7 13. La4 Ke6 14. Te1 Le7 15. Te2 Db5 16. Le1+ Txc8
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It is a fine demonstration of the potential of the fairy condition Disparate. In the solution, a white promotion (into piece X) occurs on square c8 before any move of [Qd8] or [Ke8]. The following move Qd7 proves that X is not a rook (it can still be a queen because of the fairy condition!). The immediately following move Ke7 proves that X is not a knight. Then Ke6 is played, followed by a move by Qd7 which proves that X is not a bishop.
X thus can only be a queen! (We still have to show that the position is legal.) Only after completion of the proof, the promoted queen is captured. It is admirable that the author managed to compose a move sequence obeying all mentioned constraints concerning the move order. A rich demonstration of the fairy condition, exciting to solve.
Henrik Juel: Definition of Disparate from Julia's Fairies:
If one side makes a move with a piece of type “x” (black, white,neutral, half-neutral, etc., King included), the other side cannot answer immediately by moving a piece of the same type “x”.). A pawn promoting is a pawn move.
To me, it is not clear from the definition that 9.c8 is undetermined, and only later is inferred to be 9.c8=Q
Why can White not decide to promote to queen? (2017-03-18)
Henrik Juel: I misunderstood your text, Vlaicu
Now I see that White indeed decides to promote to queen, and your argument shows why the other promotion choices do not work in this proof game (2017-03-18)
Henrik Juel: ... even though the promoted man never moves (2017-03-18)
paul: Jacobi checked the last 12 moves and gave unique solution.
cond disparate
stip dia 4 pieces white Ke1 Qd4 Ra1h1 Bc1f1 Sb1f3 Pa2b2c2e2f2g2h2d5 black Ke8 Qd8 Ra6h8 Bc8f8 Sh5b8 Pa5b7c7d7e7f7g7h7
stip dia 12 forsyth 2r5/1p2bppp/sr2k3/pq1pp2s/B2Q3S/5K2/PPP1RPPP/RS2B3 (2023-07-12)
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Keywords: Schnoebelen Theme, Disparate, Prentos Theme, Ceriani-Frolkin Theme
Genre: Fairies, Retro
FEN: 2r5/1p2bppp/nr2k3/pq1pp2n/B2Q3N/5K2/PPP1RPPP/RN2B3
Input: Vlaicu Crisan, 2017-03-18
Last update: A.Buchanan, 2019-02-03 more...
12 - P1359492
Andrew Buchanan
17464 Die Schwalbe 291, p. 492, 06/2018
to Torsten Linß
P1359492
(2+4) C+
h#6
1. f3 Kg4 2. f2 Kf3 3. c1=L Ke2 4. f1=L+ Kd1 5. Lc4 Kxc1 6. La2 Lc3#
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See P1316696 and P1359493
Henrik Juel: Pg2 prevents cooks ending 5... Kxc2 6.La2 Lc3# (2019-01-12)
A.Buchanan: I just realized I chose the dedications of these two problems the right way round luckily: L for Linß and S for Schnoebelen :D (2019-01-12)
VL: Reprint: (2) Problemas 37, p.1232, 01/2022 (2022-01-23)
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Keywords: Minimal, Schnoebelen Theme (l), Prentos Theme (l), Ceriani-Frolkin Theme (l), Miniature, Promotion (ll)
Genre: h#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 8/8/8/7K/5p2/8/2pB2p1/k7
Input: Felber, Volker, 2019-01-12
Last update: A.Buchanan, 2021-01-21 more...
13 - P1359493
Andrew Buchanan
17465 Die Schwalbe 291, p. 492, 06/2018
to Philippe Schnoebelen
P1359493
(2+4) C+
h#6
1. c1=S Lxe7 2. d3 Kf2 3. d2 Ke3 4. d1=L Kd2 5. Lb3 Kxc1 6. La2 Lf6#
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See P1316696 and P1359492
And see P1375440 for a fairy version
Mario Richter: Henrik wrote: "The term Schnoebelen theme first was used in proof games".

Even if it's like fighting against windmills, "Schnoebelen promotions" were *NOT* first used in proof games, but in orthodox retros. Ceriani invented the theme in 1948, maybe even before Philippe was born!
See my post in the Retros Mailig List:
https://pairlist1.pair.net/pipermail/retros/2008-December/002752.html (2019-01-13)
VL: Reprint: (3) Problemas 37, p.1232, 01/2022 (2022-01-23)
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Keywords: Minimal, Promotion key (s), Schnoebelen Theme (s), Prentos Theme (s), Ceriani-Frolkin Theme (s), Miniature, Promotion (sl)
Genre: h#
Computer test: Popeye WINDOWS98-32Bit-Version 3.77 (8192KB)
FEN: 8/4p3/5B2/8/3p4/8/2p5/k5K1
Input: Felber, Volker, 2019-01-12
Last update: A.Buchanan, 2021-01-21 more...
14 - P1375440
Andrew Buchanan
17465v Die Schwalbe 291, p. 492, 06/2018
to Rewan Demontay
P1375440
(3+4) C+
h#6
White Dummy f2
1. c1=DU Lxe7 2. d3 Kf1 3. d2 Ke2 4. d1=L Kd2 5. Lb3 Kxc1 6. La2 Lf6#
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Added 1 Dummy to P1359493, and changed the dedicatee. My luck with this little series continues to hold: the dedicatee's surname begins with a D!
James Malcom: Andrew, I just found this today-I thank you very much, but perhaps it holds no more, for my true name is known now! (2020-10-28)
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Keywords: Miniature, Promotion key (du), Schnoebelen Theme (du), Prentos Theme (du), Ceriani-Frolkin Theme (du), Promotion (du,l)
Pieces: i = Dummy (DU)
Genre: h#, Fairies
Computer test: Popeye 4.81
FEN: 8/4p3/5B2/8/3p4/8/2p2I2/k5K1
Input: A.Buchanan, 2020-05-03
Last update: A.Buchanan, 2021-05-01 more...
15 - P1375654
Andrew Buchanan
(2) MatPlus.net Forum 09/05/2020
in memory of Wilhelm Steinitz
P1375654
(13+14) C+
PG in 8.0 (-:
1. f4 a5 2. f5 a4 3. f6 a3 4. fxe7 axb2 5. exf8=B! bxa1=L 6. Lb2 Ke7! 7. Lf6+ Ke6! 8. Sc3 Dxf8!
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Henrik Juel: The solution is almost given away by the keywords
1.f4 a5 2.f5 a4 3.f6 a3 4.fxe7 axb2 5.exf8! bxa1=L 6.Lb2 Ke7 7.Lf6+ Ke6 8.Sc3 Dxf8
Even though Black captures the white man on f8, promotion to DTLS will not work
First Schnoebelen with dummy pawn as the captured man, I would think
Very good, Andrew (2020-05-08)
Henrik Juel: Another first:
Never before was a problem commented in the PDB before it was published... (2020-05-08)
James Malcom: When Andrew messaged me this asking about a PG with two dummies, I came back almost right away with the same idea, albeit in a flawed form-1. a4 f5 2. a5 f4 3. a6 f3 4. axb7 fxe2 5. bxa8=Q exd1 6. Ke2 e6 7. Ke3 Qg5+ 8. Kd4 Qxg2 9. Qf3 Qxh1 10. Qxd1. Great minds think alike after all! The best way. I think, to have two dummies is to have one per side and have both kings make the same journey. An idea to make it all unique is the problem though. (2020-05-08)
A.Buchanan: Haha Henrik thank you. Well I'm in lockdown in Singapore, and it was 9-May already when I posted in Matplus. (2020-05-09)
A.Buchanan: Can claim that this is not Schnoebelen because the pawn wasn't promoted! Just remained as a pawn! But I'm sure the Schnoebelen theme was interpreted in a looser sense in 1860s. Although exponents in that era would have been baffled as to *why* the theme was termed "Schnoebelen", as Philippe was not yet born. (2020-05-09)
Henrik Juel: I am sorry to learn about the Singapore lockdown, but here the merriment has no bounds (apart from the notational dilemma: exf8 is not a promotion and still the PDB animation requires exf8=B) (2020-05-09)
Olaf Jenkner: If you consider each pawn move onto the 8th rank as a promotion then we have the Schnoebelen. (2020-05-09)
A.Buchanan: This is not "non-standard material", removing that keyword. (2022-01-26)
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Keywords: Unique Proof Game, Schnoebelen Theme (B), Phoenix (l), Prentos Theme (B), Ceriani-Frolkin Theme (B), Dummy Pawn, Golden Age (Dummy Pawn), Promotion (Bl)
Genre: Retro
Computer test: Jacobi v0.7.4 2020-05-08
FEN: rnb2qnr/1ppp1ppp/4kB2/8/8/2N5/P1PPP1PP/b2QKBNR
Input: A.Buchanan, 2020-05-08
Last update: A.Buchanan, 2023-08-04 more...
16 - P1379376
James Malcom
(30) MatPlus.net Forum 26/8/2020
P1379376
(13+13) C+
BP in 11.0
(-:
1. f4 b5 2. f5 b4 3. f6 b3 4. fxe7 bxc2 5. exf8=B cxb1=L 6. Da4 Ke7 7. Dh4+ Ke6 8. g4 Se7 9. Lg2 Txf8 10. Lb7 Sc6 11. Lxc8 Tb8
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Henrik Juel: What is the joke, James?
Natch 3.1 found no solution (2020-08-26)
James Malcom: The solution has now been added in, Henrik.

This PG has two purposes.
1) It is another exploration of what themes be realized with the dummy pawn involves.
2) It is also to push the boundaries of how long a dummy pawn PG can be made. (2020-08-27)
Henrik Juel: Thanks, James
Apparently you also extended the proof game; the one I tested was in 10.5
The solution shows the Schnoebelen theme, by the way (2020-08-27)
Henrik Juel: You forgot to remove wPf2 from the diagram position (2020-08-27)
James Malcom: Removed, and yes I did manage to find a way to extend it by a ply, in theme for its purpose. The version is also C+. (2020-08-27)
A.Buchanan: I think sLb1 is kind of anti-Belfort Any way to replace it with a Phoenix/Prenix knight? (2020-08-27)
Henrik Juel: Strictly speaking, this is not Belfort, which requires two units to stand away
As Andrew suggests, if sLb1 were a black knight, we would have Belfort (2020-08-27)
A.Buchanan: It's limiting to just talk about Belfort Theme - one historical tourney which had a fiddly constraint about the number of pieces exhibiting the property. Want really to talk more generally about Belfort *Effect*, which is a property of a single unit (2022-01-26)
comment
Keywords: Belfort (L), Dummy Pawn, Schnoebelen Theme, Golden Age (Dummy Pawn), Ceriani-Frolkin Theme (B), Prentos Theme (B), Unique Proof Game, Non-standard material (l)
Genre: Retro
Computer test: Jacobi v.0.7.5
FEN: 1rBq1r2/p1ppnppp/2n1k3/8/6PQ/8/PP1PP2P/RbB1K1NR
Input: James Malcom, 2020-08-26
Last update: A.Buchanan, 2023-08-04 more...
17 - P1381345
James Malcom
(36) MatPlus.net Forum 14/10/2020
P1381345
(13+11) C+
BP in 9.5
(-:
1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exf8=B gxh1=T 6. Lg2 Ke7 7. Lxb7 Ke6 8. Lxa8 Se7 9. Lb7 Txf8 10. Lxc8
play all play one stop play next play all
http://matplus.net/start.php?px=1603899391&app=forum&act=posts&tid=2475&fid=gen&page=1
James Malcom: The point of this PG was to make a true Belfort, after the lone bishop in P1379376 was pointed out to not be a true Belfort. (2020-10-28)
A.Buchanan: Belfort is not in the Encyclopedia! (2020-10-30)
more ...
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Keywords: Schnoebelen Theme (B), Dummy Pawn, Golden Age (Dummy Pawn), Belfort (Lt), Prenix (t), Prentos Theme (B), Ceriani-Frolkin Theme (B), Unique Proof Game
Genre: Retro
Computer test: Jacobi v.0.7.5
FEN: 1nBq1r2/p1ppnpp1/4k3/8/8/8/PPPPP2P/RNBQK1Nr
Input: James Malcom, 2020-10-28
Last update: A.Buchanan, 2023-08-04 more...
18 - P1382408
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Roberto Osorio

15 feenschach 237, p. 224, 09-10/2019
P1382408
(12+11) C+
BP in 9.5
1. d4 a5 2. d5 a4 3. d6 a3 4. dxc7 axb2 5. cxb8=D bxc1=D 6. Dxc8 Dg5 7. Dc4 Dxg2 8. Dxf7+ Kxf7 9. Lxg2 Ke8 10. Lf1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
A.Buchanan: Can anyone send me the full results of this JT please? I have an unpublished one which is similar in theme, and I want to confirm that I’m not anticipated. I will load all problems into PDB if they’re not already here (2020-11-26)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Dd), Switchback (Lk), Ceriani-Frolkin Theme (Dd)
Genre: Retro
FEN: r2qkbnr/1p1pp1pp/8/8/8/8/P1P1PP1P/RN1QKBNR
Input: Gunter Jordan, 2020-11-25
Last update: A.Buchanan, 2021-02-20 more...
19 - P1382432
Andrew Buchanan
Facebook 26/11/2020
P1382432
(11+15) C+
KBP
1. g4 h5 2. Lg2 hxg4 3. Lf3 gxf3 4. Kf1 fxe2+ 5. Kg2 exd1=T! 6. Kf3! Txc1 7. Ke2 Te1+ 8. Kxe1
play all play one stop play next play all
Henrik Juel: Excellent find, Andrew
Hint: length is 7.5 (2020-11-25)
A.Buchanan: Thanks Henrik - amazed to find it’s not in WinChloe or Yacpdb (2020-11-26)
A.Buchanan: The animation fails for "SPG", instead "KBP" is needed. (2020-11-26)
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Keywords: Unique Proof Game, Homebase (2), Pure Round Trip (K5), Ceriani-Frolkin Theme (t), Prentos Theme (t), Tempo Loss
Genre: Retro
Computer test: C+ Natch 3.1 C+ Euclide 1.01 for 6.0, 6.5, 7.0 & 7.5 moves, which is conclusive.
FEN: rnbqkbnr/ppppppp1/8/8/8/8/PPPP1P1P/RN2K1NR
Reprints: chess.stackexchange.com 26/11/2020
Input: A.Buchanan, 2020-11-25
Last update: A.Buchanan, 2020-11-26 more...
20 - P1382804
Silvio Baier
26 feenschach 237, p. 225, 09-10/2019
P1382804
(9+9) C+
BP in 11.5
1. f4 c5 2. f5 c4 3. f6 c3 4. fxg7 cxb2 5. gxh8=D bxc1=T 6. Dxh7 Txc2 7. Dxg8 Txd2 8. Dg3 Txa2 9. Dxd7+ Sxd7 10. Txa2 Tb8 11. Dxb8 Sxb8 12. Ta1
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A.Buchanan: My personal opinion is that excelsior as a keword does not exist for proof games, as all promotions are excelsiors. I don't think under-promotion as a keyword exists for any genres except direct mates & studies. I haven't included promotion yet, but I'm happy to oblige. I also include Ceriani-Frolkin whenever I include Prentos. (2020-12-08)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Dt), Switchback (Ts), Promotion (Dt), Ceriani-Frolkin Theme (Dt)
Genre: Retro
FEN: 1nbqkb2/pp2pp2/8/8/8/8/4P1PP/RN2KBNR
Input: Gunter Jordan, 2020-12-08
Last update: A.Buchanan, 2021-02-20 more...
21 - P1384178
Bernd Graefrath
481 Julias Fairies 07/01/2014
P1384178
(15+14) C+
Beweispartie in 6,5 Zügen
Schlagschach
Immunschach
1. e4 e5 2. Ke2 d5 3. exd5 Le6 4. dxe6 a6 5. e7 Kd7 6. e8=K Kxe8 7. Ke1
play all play one stop play next play all
Something must occupy e2 on move W2 in order to protect the brave wPe as it advances.
- T is not near enough
- If this is D, then it would play 5. Dxe5 or 5. Dxa6
- If this is L, then is would play 5. Lxa6
- If this is Sg1, any promoted S on e8 is still immune because of Sb1
So by elimination, it must be Ke2
http://juliasfairies.com
Henrik Juel: Why does the animation not work?
The solution seems to be written correctly (2021-10-20)
A.Buchanan: I have changed the stipulation, and that seems to have fixed things (2021-10-21)
A.Buchanan: While this is ingenious, in the diagram position, Black is in the losing chess equivalent of check, implying that White's last move can only be Ke2-e1 or Se2-g1. This spoils the logic. Is it possible to find a 7th move for Black which escapes the check? (2021-10-21)
Henrik Juel: Thanks, Andrew
Surprising that changing Beweispartie to BP fixes the animation (2021-10-21)
A.Buchanan: And changing it back again to Beweispartie, it still works. Maybe there was an old version of the generated code which drives the animation based on the solution, and that needed to be refreshed? All very odd. (2021-10-21)
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Keywords: Homebase (w), Losing Chess, Switchback (Kk), Unique Proof Game, Immune Chess, Schnoebelen Theme (K), Ceriani-Frolkin Theme (K), Prentos Theme (K)
Genre: Retro, Fairies
Computer test: C+ Jacobi 0.7.5
FEN: rn1qkbnr/1pp2ppp/p7/4p3/8/8/PPPP1PPP/RNBQKBNR
Input: RJB, 2014-01-08
Last update: A.Buchanan, 2021-10-21 more...
22 - P1384182
Thomas Thannheiser
16054 Die Schwalbe 268, p. 571, 8/2014
P1384182
(11+9)
Beweispartie in 10,5 Zügen
Schlagschach
1. h4 Sc6 2. h5 Sd4 3. h6 Sxe2 4. hxg7 Sxc1 5. gxh8=T Sxa2 6. Txa2 a5 7. Txa5 Txa5 8. T8xh7 Th5 9. T7xh5 Lg7 10. Th8 Lxh8 11. Txh8
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Keywords: Anti-Pronkin, Beweispartie, Ceriani-Frolkin-Thema, Donati-Thema
SB: "Sehr schwer zu lösen, weil kaum Anhaltspunkte in der Diagrammstellung sichtbar sind. Letztendlich schält sich thematisch ein Donati und ein Anti-Pronkin auf weißer Seite heraus. Als Rätsel ok, thematisch zeigt die folgende Aufgabe, was möglich ist." MRic hingegen: "Der wUW-Th8 verlässt sein UW-Feld, nur um später wieder dorthin zurückzukehren und geschlagen zu werden, wonach letztendlich sein Original-Bruder von h1 seinen Tod rächt und seinen Platz auf dem UW-Feld einnimmt. Das ist wieder ein schönes Stück aus dem Hause Thannheiser - kurz, prägnant und witzig, hat mir sehr gut gefallen!" KHS: "Interessant, wie der wT nach h8 gelangt." TZ: "Hier sind die Spuren des sS und whB noch deutlich zu erkennen, so dass die ersten Züge recht klar sind. Die linke mit der rechten Hälfte dann zu verbinden, hat noch ein wenig Mühe gekostet, da ich es länger mit einem wL auf h8 versucht hatte." JB: "Ein starkes T-Duell mit w 'Vorweg-Phönix-Turm' - noch einmal Ceriani-frolkin." HG: "In Fast-Homebase wird ein geschlagener Donati-Turm durch einen Anti-Pronkin-Turm ersetzt. Dupont möchte das allerdings sogar orthodox inzwischen gern doppelt gesetzt haben. Was bei Schlagschachaufgaben in der Regel den Kunstgenuss trübt, sind die (offenbar unumgänglichen) nichtthematischen Schlagfälle, die erkennbar auch die Konstruktion erleichtern."
Moldenhauer: Computerprüfung: C+ Popeye 4.88 in 3 Min. 7 Sek.
keine Lösung in BP10 (2022-08-28)
Henrik Juel: Popeye 4.61 (using 1099 MB) spent 2:03 min., mostly verifying uniqueness (2022-08-29)
Henrik Juel: The non-solution in 10.0 moves took 8 sec. (2022-08-29)
comment
Keywords: Ceriani-Frolkin Theme, Losing Chess, Unique Proof Game, Homebase (s), Donati Theme (T), Anti-Pronkin (T), Prentos Theme (T)
Genre: Retro, Fairies
FEN: 2bqk1nR/1ppppp2/8/8/8/8/1PPP1PP1/1N1QKBN1
Input: RJB, 2014-08-03
Last update: A.Buchanan, 2022-08-29 more...
23 - P1384449
Bernd Ellinghoven
Bernd Graefrath

D Die Schwalbe 257, p. 597, 10/2012
Hemmo Axt zum 70. Geburtstag
P1384449
(14+14)
BP in 10.5
1. e3 g5 2. Df3 g4 3. Le2 g3 4. Kf1 gxf2 5. g3 f5 6. Kg2 f1=T 7. Sh3 Txc1 8. Txc1 f4 9. Df1 f3 10. Lxf3 Kf7 11. Lh5+
play all play one stop play next play all
Henrik Juel: C++ Euclide 1.01
No solutions in 10.0 (2020-12-30)
A.Buchanan: There are no under-promotions except in directmates and studies. There are no excelsiors in proof games. (2020-12-31)
comment
Keywords: bi-coloured Bristol, Indian (Platzwechsel-), Interchange (D-L), Prentos Theme (t), Ceriani-Frolkin Theme (t), Unique Proof Game
Genre: Retro
FEN: rnbq1bnr/pppppk1p/8/7B/8/4P1PN/PPPP2KP/RNR2Q2
Input: Gunter Jordan, 2020-12-30
Last update: A.Buchanan, 2021-01-01 more...
24 - P1384784
Bernd Graefrath
Roberto Osorio

48 feenschach 237, p. 227, 09-10/2019
P1384784
(11+11) C+
BP in 9,0
1. a4 g5 2. a5 g4 3. a6 g3 4. axb7 gxh2 5. bxc8=D hxg1=S 6. Dxb8 Sxe2 7. Dxa7 Sxc1 8. Dxc1 Txa7 9. Dd1 Ta8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
A.Buchanan: "genau ein Stein eine zweizügige Rückkehr vollführt" I don't understand this: "exactly one piece makes a two-move switchback?" Which piece is this? Structurally both sides seem to be making the same kinds of moves: 7 with the promoter, and then 2 with a capturer (2021-01-01)
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Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Ds), Switchback (Dt), Promotion (Ds), Ceriani-Frolkin Theme (Ds)
Genre: Retro
FEN: r2qkbnr/2pppp1p/8/8/8/8/1PPP1PP1/RN1QKB1R
Input: Gunter Jordan, 2020-12-31
Last update: A.Buchanan, 2021-02-20 more...
25 - P1385599
Michel Caillaud
MatPlus.net Forum 12/01/2021
P1385599
(15+14)
PG in 8.0
Staugaard castling
b) 1. e4 d5 2. e5 Dd6 3. exd6 Kd7 4. dxe7 Kc6 5. e8=T Kb6 6. 0-0-0-0-0-0 Lg4 7. Kf4 Lxe2 8. Kg3 Lc4
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Objective: Objective: Staugaard (Pam-Krabbé) rook is captured.
Henrik Juel: solution
1.e4 d5 2.e5 Dd6 3.exd6 Kd7 4.dxe7 Kc6 5.e8=T Kb6 6.0-0-0-0-0-0 Lg4 7.Kf4 Lxe2 8.Kg3 Lc4
Hidden castling (2021-01-21)
A.Buchanan: Thematic Ceriani-Frolkin seems a great way to conceal P-K castling! But normally wK returns to e1 in hidden castling. Absence of P-K in engine makes it harder to verify soundness of implausible moves like that. (2021-01-22)
comment
Keywords: Unique Proof Game, Staugaard castling, Ceriani-Frolkin Theme (T), Castling Paradox (hidden P-K), Promotion (T), Prentos Theme (T)
Genre: Retro, Fairies
FEN: rn3bnr/ppp2ppp/1k6/3p4/2b5/6K1/PPPP1PPP/RNBQ1BNR
Input: A.Buchanan, 2021-01-21
Last update: Rainer Staudte, 2021-05-10 more...
26 - P1385721
Silvio Baier
74 feenschach 237, p. 230, 09-10/2019
P1385721
(10+9) C+
BP in 11.0
1. c4 f5 2. c5 f4 3. c6 f3 4. cxb7 fxg2 5. bxc8=T gxh1=D 6. Txc7 Dxg1 7. Txd7 Dg6 8. Txa7 Dxd2+ 9. Sxd2 Txa7 10. Tb1 Dxb1 11. Sxb1 Ta8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
Henrik Juel: Experiments with Euclide 1.01
First 8.0 moves: C+ in a second
First 8.5 moves: C+ in a minute
First 9.0 moves: no output in 20 minutes (2021-02-21)
Henrik Juel: continued
First 9.0 moves: C+ in 54 minutes
extrapolating crudely, a full testing should last a thousand years... (2021-02-21)
Michel Caillaud: Today, the program to be used for these proofgames with many "invisible" captures is Jacobi.
The full testing with Jacobi 0.7.5 is almost one day (81300s), still much less than a thousand years... (2021-02-23)
A.Buchanan: Both original white rooks are captured after single promotion to rook. Is that double Prenix (2021-02-24)
more ...
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Td), Switchback (St), Promotion (Td), Ceriani-Frolkin Theme (Td), Prenix (Td)
Genre: Retro
Computer test: C+ Jacobi 0.7.5 81300s
FEN: rn2kbnr/4p1pp/8/8/8/8/PP2PP1P/1NBQKB2
Input: Gunter Jordan, 2021-01-25
Last update: A.Buchanan, 2021-02-24 more...
27 - P1386611
Silvio Baier
Thierry Le Gleuher
Bernd Graefrath
Roberto Osorio
Gregor Werner

98 feenschach 237, p. 232, 09-10/2019
P1386611
(12+11) C+
BP in 9.0
1. f4 a5 2. f5 a4 3. f6 a3 4. fxg7 axb2 5. gxf8=L bxa1=D 6. Lxe7 Df6 7. Lxd8 Dxf1+ 8. Kxf1 Kxd8 9. Ke1 Ke8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

In der Originalquelle f 237 stand eine falsche Lösung. Die hier angegebene Lösung ist richtig.
A.Buchanan: Under-promotion & excelsior are meaningless for PGs (2021-02-19)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (Ld), Homebase (2), Prentos Theme (Ld), Switchback (Kk), Promotion (Ld)
Genre: Retro
FEN: rnb1k1nr/1ppp1p1p/8/8/8/8/P1PPP1PP/1NBQK1NR
Input: Gunter Jordan, 2021-02-18
Last update: A.Buchanan, 2021-02-19 more...
28 - P1387652
Andrey Frolkin
WCCT 2020
P1387652
(12+12)
BP in 9.5
1. g4 b5 2. g5 b4 3. g6 b3 4. gxh7 bxa2 5. hxg8=S axb1=S 6. Sxe7 Sc3 7. Sd5 Sxe2 8. Sc3 Sxc1 9. Txc1 Sc6 10. Sb1
play all play one stop play next play all
Scheint ein Selbstplagiat zu sein. Das Stück wurde in Problemas (SEPA), 07/2020, Heft 31, H1, Seite 935 als Original veröffentlicht.
Henrik Juel: C+ Euclide 1.01
This is an example of the retro theme of WCCT-11
The thematic square is b1, where Sb1 is not original, but promoted, and where Black promoted, only to have his promoted piece captured later
The fact that the promotions are both to knight is not required by the theme (2021-03-21)
Henrik Juel: The PDB definition of Antiphönix recommends that this keyword should be deleted... (2021-03-21)
comment
Keywords: blocking of a piece, Excelsior black, Excelsior white, Phoenix, Prentos Theme (s), Pronkin Theme (S), Promotions to Knights, under-promotion (ss)
Genre: Retro
FEN: r1bqkb1r/p1pp1pp1/2n5/8/8/8/1PPP1P1P/1NRQKBNR
Reprints: H Springaren 154, p. 49, 06/2020
H The Problemist , p. 383, 07/2020
Input: Gunter Jordan, 2021-03-21
Last update: Gunter Jordan, 2023-04-03 more...
29 - P1387696
Silvio Baier
Thierry Le Gleuher
Bernd Graefrath
Ralf Krätschmer
Roberto Osorio

131 feenschach 237, p. 235, 09-10/2019
P1387696
(11+11) C+
BP in 10.0
1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exd8=L gxh1=S 6. Lxc7 Sxg3 7. Le5 Sxe2 8. Lxg7 Sxc1 9. Dxc1 Lxg7 10. Dd1 Lf8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
Henrik Juel: tiny typo: 6... Sg3, not Sxg3
correcting this should enable the animation (2021-03-22)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Ls), Switchback (Dl), Promotion (Ls)
Genre: Retro
FEN: rnb1kbnr/pp1p1p2/8/8/8/8/PPPP3P/RN1QKBN1
Input: Gunter Jordan, 2021-03-22
Last update: A.Buchanan, 2021-04-06 more...
30 - P1387875
Silvio Baier
132 feenschach 237, p. 235, 09-10/2019
P1387875
(10+11) C+
BP in 10.5
1. f4 g5 2. f5 g4 3. f6 g3 4. fxe7 gxh2 5. exf8=L hxg1=S 6. Ld6 Sxe2 7. Lxc7 Sxc1 8. La6 Sxa6 9. Dxc1 Tb8 10. Lxb8 Sxb8 11. Dd1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
Henrik Juel: Missing stipulation: BP in 10,5 (2021-03-26)
Gunter Jordan: Danke für den Hinweis. Habe ich sogleich eingefügt! (2021-03-27)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Ls), Switchback (Ds), Promotion (Ls)
Genre: Retro
FEN: 1nbqk1nr/pp1p1p1p/8/8/8/8/PPPP2P1/RN1QK2R
Input: Gunter Jordan, 2021-03-26
Last update: A.Buchanan, 2021-04-06 more...
31 - P1388631
Silvio Baier
Gunter Jordan
Raúl Jordan
Roberto Osorio

154 feenschach 237, p. 238, 09-10/2019
P1388631
(11+12) C+
BP in 9.0
1. f4 a5 2. f5 a4 3. f6 a3 4. fxg7 axb2 5. gxf8=S bxc1=D 6. Se6 Dxb1 7. Sxd8 Dxa2 8. Txa2 Kxd8 9. Ta1 Ke8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
A.Buchanan: Excelsior is never a feature for proof games. particularly distinguishing white from black excelsiors is meaningful for d#, s# & possibly h#. Under-promotions are meaningless for proof games, and makes search much harder. More is less for tags. Maybe we can have "theme or derived" feature like in WinChloe in future which would allow these things to be derived, but they should not form part of the core tagging. I am concerned that there is some LaTeX file somewhere where these nonsense tags are effectively being treated as the master data source and could be reinjected to PDB on a whim. (2021-04-16)
A.Buchanan: More positively, please start using the Future PG tag. Here the Prentos, prenix and switchback are doubled features. For homebase, I think one might consider "trapped hole" as a defect: here d8 can only reasonably be captured by a knight, but it's probably not worth being a tag. Here, the doubled prenix including missing wSb1 is an important mitigation. (2021-04-16)
more ...
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Sd), Switchback (Tk), Promotion (Sd), Ceriani-Frolkin Theme (Sd), Prenix (Sd), Future Proof Game (Prentos+Prenix+Sback)
Genre: Retro
FEN: rnb1k1nr/1ppppp1p/8/8/8/8/2PPP1PP/R2QKBNR
Input: Gunter Jordan, 2021-04-15
Last update: A.Buchanan, 2021-04-16 more...
32 - P1388682
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Ralf Krätschmer
Roberto Osorio

155 feenschach 237, p. 238, 09-10/2019
P1388682
(12+11) C+
BP in 9.0
1. g4 b5 2. g5 b4 3. g6 b3 4. gxh7 bxc2 5. hxg8=S cxb1=D 6. Sxe7 Dg6 7. Sxc8 Dxg1 8. Txg1 Dxc8 9. Th1 Dd8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
more ...
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Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Sd), Switchback (Td), Promotion (Sd), Prenix (S), Ceriani-Frolkin Theme (Sd), Future Proof Game (Prentos+Sback)
Genre: Retro
FEN: rn1qkb1r/p1pp1pp1/8/8/8/8/PP1PPP1P/R1BQKB1R
Input: Gunter Jordan, 2021-04-16
Last update: A.Buchanan, 2021-04-17 more...
33 - P1388717
Ralf Krätschmer
R554 The Problemist 05/2020
P1388717
(11+9) C+
BP in 11.5
1. b4 f5 2. b5 f4 3. b6 f3 4. bxc7 fxg2 5. cxb8=S gxh1=D 6. Sxd7 Dd5 7. Sxf8 Dxd2+ 8. Lxd2 Dxd2+ 9. Sxd2 Kd8 10. Sxh7 Txh7 11. Tc1 Th8 12. Sb1+
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ Natch 3.3 in 5 Tage 10 Std. 49 Min. eine Lösung gefunden.
Prüfung BP in 11 u. 12, keine Lösung! (2022-08-30)
A.Buchanan: Since the position is check, the only shorter PG which requires examination is 10.5 (2022-08-30)
Moldenhauer: Computerüberprüfung: BP in 10.5 Natch 3.3 keine Lösung! Zeit 16 Std. 22 Min. (2022-09-01)
more ...
comment
Keywords: Discovered check, Unique Proof Game, Excelsior black, Excelsior white, Prentos Theme (Sd), Switchback (St), Promotion (d), under-promotion (S), x pieces capture on one square (4)
Genre: Retro
Computer test: Computerprüfung: C+ Natch 3.3 in 5 Tage 10 Std. 49 Min. eine Lösung gefunden. Prüfung BP in 11 u. 12, keine Lösung!
FEN: r1bk2nr/pp2p1p1/8/8/8/8/P1P1PP1P/1NRQKBN1
Input: Gunter Jordan, 2021-04-18
Last update: A.Buchanan, 2022-08-30 more...
34 - P1389155
Silvio Baier
Thierry Le Gleuher
Ralf Krätschmer
Roberto Osorio

169 feenschach 237, p. 239, 09-10/2019
P1389155
(11+10) C+
BP in 9.5
1. b4 f5 2. b5 f4 3. b6 f3 4. bxa7 fxg2 5. axb8=S gxh1=T 6. Sxd7 Txh2 7. Sxf8 Txf2 8. Sxh7 Txh7 9. Kxf2 Th8 10. Ke1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
Moldenhauer: Computerprüfung: C+ Stelvio 1.4 03:05:53 Stunden. (hh:mm:ss)
Keine Lösung: BP 9.0. (2023-07-23)
comment
Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (St), Switchback (Kt), under-promotion (St)
Genre: Retro
Computer test: Stelvio 1.4
FEN: r1bqk1nr/1pp1p1p1/8/8/8/8/P1PPP3/RNBQKBN1
Input: Gunter Jordan, 2021-05-01
Last update: Silvio Baier, 2023-08-15 more...
35 - P1389187
Thierry Le Gleuher
Ralf Krätschmer
Roberto Osorio

170 feenschach 237, p. 239, 09-10/2019
P1389187
(11+11) C+
BP in 9.5
1. b4 g5 2. b5 g4 3. b6 g3 4. bxa7 gxh2 5. axb8=S hxg1=T 6. Sc6 Txg2 7. Sxd8 Txf2 8. Sxb7 Lxb7 9. Kxf2 Lc8 10. Ke1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
Moldenhauer: Computerprüfung: C+ Stelvio 1.4 04:00:17 Stunden. (hh:mm:ss)
Keine Lösung: BP 9.0. (2023-07-23)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (St), Switchback (Kl), under-promotion (St), Ceriani-Frolkin Theme (St), Prenix (S), Future Proof Game (Prentos+Sback)
Genre: Retro
Computer test: Stelvio 1.4
FEN: r1b1kbnr/2pppp1p/8/8/8/8/P1PPP3/RNBQKB1R
Input: Gunter Jordan, 2021-05-02
Last update: Silvio Baier, 2023-08-15 more...
36 - P1389374
Silvio Baier
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Ralf Krätschmer
Roberto Osorio

175 feenschach 237, p. 240, 09-10/2019
P1389374
(11+11) C+
BP in 9.5
1. b4 f5 2. b5 f4 3. b6 f3 4. bxc7 fxg2 5. cxd8=S gxf1=L 6. Se6 Lxe2 7. Sxf8 Lxd1 8. Sxh7 Txh7 9. Kxd1 Th8 10. Ke1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
more ...
comment
Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Kt), under-promotion (Sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 02:01:02 Stunden.(hh:mm:ss) Keine Lösung: BP 9.0.
FEN: rnb1k1nr/pp1pp1p1/8/8/8/8/P1PP1P1P/RNB1K1NR
Input: Gunter Jordan, 2021-05-07
Last update: A.Buchanan, 2023-07-29 more...
37 - P1389383
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Roberto Osorio

176 feenschach 237, p. 240, 09-10/2019
P1389383
(11+11) C+
BP in 9.5
1. f4 h5 2. f5 h4 3. f6 h3 4. fxg7 hxg2 5. gxf8=S gxf1=L 6. Se6 Lxe2 7. Sxd8 Lxd1 8. Sxb7 Lxb7 9. Kxd1 Lc8 10. Ke1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
more ...
comment
Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Kl), under-promotion (Sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 04:29:10 Stunden.(hh:mm:ss) Keine Lösung: BP 9.0.
FEN: rnb1k1nr/p1pppp2/8/8/8/8/PPPP3P/RNB1K1NR
Input: Gunter Jordan, 2021-05-08
Last update: A.Buchanan, 2023-07-29 more...
38 - P1389414
Silvio Baier
Thierry Le Gleuher

177 feenschach 237, p. 240, 09-10/2019
P1389414
(11+11) C+
BP in 11.0
1. h4 g5 2. hxg5 h5 3. g6 h4 4. g7 h3 5. gxf8=S hxg2 6. Se6 gxf1=L 7. Sxd8 Lxe2 8. Sc6 Lxd1 9. Kxd1 Sa6 10. Ke1 Tb8 11. Sxb8 Sxb8
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
more ...
comment
Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Ks), under-promotion (Sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 in 147:48:36 Stunden. (hh:mm:ss) Keine Lösung: BP 10.5 in 39:42:33 Stunden.
FEN: 1nb1k1nr/pppppp2/8/8/8/8/PPPP1P2/RNB1K1NR
Input: Gunter Jordan, 2021-05-09
Last update: A.Buchanan, 2023-08-08 more...
39 - P1389442
Silvio Baier
Thierry Le Gleuher

178 feenschach 237, p. 240, 09-10/2019
P1389442
(12+12) C+
BP in 9.5
1. g4 f5 2. g5 f4 3. g6 f3 4. gxh7 fxe2 5. hxg8=S exf1=L 6. Sh6 Ld3 7. Sf7 Lxc2 8. Sxd8 Kxd8 9. Dxc2 Ke8 10. Dd1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
Moldenhauer: Computerprüfung: C+ Stelvio 1.4 in 00:04:33 Minuten. (hh:mm:ss)
Keine Lösung: BP 9.0. (2023-07-22)
comment
Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Dk), under-promotion (Sl)
Genre: Retro
Computer test: Stelvio 1.4
FEN: rnb1kb1r/ppppp1p1/8/8/8/8/PP1P1P1P/RNBQK1NR
Input: Gunter Jordan, 2021-05-10
Last update: Silvio Baier, 2023-08-15 more...
40 - P1389465
Silvio Baier
Roberto Osorio

179 feenschach 237, p. 240, 09-10/2019
P1389465
(12+11) C+
BP in 9.5
1. h4 f5 2. h5 f4 3. h6 f3 4. hxg7 fxe2 5. gxf8=S exf1=L 6. Sg6 Ld3 7. Sxe7 Lxc2 8. Sxc8 Dxc8 9. Dxc2 Dd8 10. Dd1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
more ...
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Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Dd), under-promotion (Sl)
Genre: Retro
Computer test: C+ Euclide 1.01 (more than 2 hours) Natch 3.1 found no solutions in 9.0 moves
FEN: rn1qk1nr/pppp3p/8/8/8/8/PP1P1PP1/RNBQK1NR
Input: Gunter Jordan, 2021-05-11
Last update: Silvio Baier, 2024-01-24 more...
41 - P1390918
Lion Xray
Facebook 17/06/2021
Happy Birthday, Andrew Buchanan
P1390918
(12+7)
#2
1. Lg2! droht 2. Th1#
1. 0-0-0? illegal
play all play one stop play next play all
Henrik Juel: The retroplay is R: 1... Kh1xLh2 2.Lg1xDTSh2+, not 2.Lg1-h2+?? leaving Black no previous move
The uncaptured bishop is [Ph2] promoted on b8 or d8 after six additional white captures, so [Pa7] must have promoted
White has only D and S left to be captured, so the black promotion was on a1, not b1, and White may not castle, because Ta1 has moved
Solution 1.Lg2 thr. 2.Th1#, not the illegal 1.0-0-0??
A delightful birthday greeting (2021-06-19)
Henrik Juel: I am trying to estimate your age, Andrew
You published your first problem in 'Mathematics at DEC' in 1991, at which time you could be around 30 years old; so your current age might be 60
In any case, happy birthday from me also, and thanks for your contributions to PDB (2021-06-19)
A.Buchanan: Thank you, Henrik, but I'm just one of the noisiest of the many servants of PDB. In Lion's problem, I particularly like the Home Circuit. He asks if there is a name for the theme where a promoted pawn is captured after homecoming? On other matters, see P1299465 :) (2021-06-19)
Henrik Juel: I think that we should just let that theme remain unnamed (here, [Ph2] promotes and returns to h2 as a bishop, which is captured) (2021-06-19)
A.Buchanan: I ask more to try to make a general pattern. There are plenty of keywords which indicate when something gets somewhere. Maybe the dramatic qualifier "fatal" can indicate the fate awaiting the piece when it gets there? So "fatal homecoming", "fatal pronkin", "fatal Donati" etc? :) (2021-06-19)
Walter Lindenthal: The solution is clear-cut. But the sequence of moves that leads to the final diagram position is characteristically influenced by the kind of b promotion. a1=bQ/bS allows a rather FREE selection of moves and finally bQ/bS/bR could occupy h2 for the R-final capture wBg1x?h2, bKh1xBh2. In contrast, a1=bR directs the sequence of moves rather tightly, and ONLY the promoted bR can occupy h2 for the R-final capture (analytic details see Facebook). (2021-06-21)
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Keywords: Cant Castler, Home Circuit, Volet Pawn (extended), Ceriani-Frolkin Theme (L), Prentos Theme (L)
Genre: 2#, Retro
FEN: 8/1p1ppppp/8/8/5N2/P5PB/1PPPPP1k/R3KR2
Input: A.Buchanan, 2021-06-18
Last update: A.Buchanan, 2021-06-19 more...
42 - P1391292
Viktor Peretyatko
R307 The Problemist , p. 28, 01/2001
P1391292
(14+9) C+
BP in 12.5
1. e4 d5 2. exd5 Sc6 3. dxc6 Ld7 4. cxb7 Lb5 5. b8=S Dd7 6. Sxd7 0-0-0 7. Sxf8 Txd2 8. Sxh7 Txh7 9. g4 Th5 10. Lh3 Te2 11. Kf1 Tc5 12. g5+ f5 13. gxf6ep+
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Valladao Task, Castling, En passant, under-promotion (S), Ceriani-Frolkin Theme (S), Prentos Theme (S)
Genre: Retro
Computer test: C+ Euclide 1.01, no solution in 11.5
FEN: 2k3n1/p1p1p1p1/5P2/1br5/8/7B/PPP1rP1P/RNBQ1KNR
Reprints: 9 Orbit 30, p. 317, 04/2006
Input: A.Buchanan, 2021-07-03
Last update: Alfred Pfeiffer, 2021-11-26 more...
43 - P1391294
Per Grevlund
251 Problemskak 6 04-06/2009
to L.Larsen for his 90 years
6. Lob
Problemskak 2008-10
P1391294
(11+13) C+
BP in 11.0
1. g4 b5 2. g5 b4 3. g6 b3 4. gxh7 bxa2 5. hxg8=S axb1=S 6. Sh6 Sxd2 7. Kxd2 g5 8. Ke3 Lxh6 9. Ld2 0-0 10. Dc1 g4 11. f4 gxf3ep+
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Valladao Task, Castling (sk), En passant (s), under-promotion (Ss), Ceriani-Frolkin Theme (Ss), Prentos Theme (Ss), Phoenix (s), Prenix (S)
Genre: Retro
Computer test: C+ Euclide 1.01, no solution in 10.0
FEN: rnbq1rk1/p1pppp2/7b/8/8/4Kp2/1PPBP2P/R1Q2BNR
Reprints: Problemskak 21 2013
Input: A.Buchanan, 2021-07-03
Last update: Björn Enemark, 2022-08-07 more...
44 - P1391298
Ladislav Packa
Emil Klemanic
Michal Dragoun
Ladislav Salai

WCCC Ohrid 09/2018
2. Lob
Champagne Tourney, 2018
P1391298
(15+12) C+
BP in 11.5
1. h4 e6 2. h5 Dh4 3. c3 Dc4 4. f4 Lb4 5. f5 Se7 6. f6 0-0 7. fxe7 Sc6 8. exf8=S Se7 9. Sxh7 Kxh7 10. Dc2 Kh6 11. d4 g5 12. hxg6ep+
play all play one stop play next play all
Henrik Juel: Thanks for posting this nice set of Valladao proof games, Andrew (2021-07-03)
A.Buchanan: Welcome Henrik - it's a popular and accessible theme :) (2021-07-03)
more ...
comment
Keywords: Unique Proof Game, Valladao Task, Castling, En passant, under-promotion (S), Ceriani-Frolkin Theme (S), Prentos Theme (S)
Genre: Retro
Computer test: C+ Euclide 1.01, no solution in 10.5
FEN: r1b5/ppppnp2/4p1Pk/8/1bqP4/2P5/PPQ1P1P1/RNB1KBNR
Input: A.Buchanan, 2021-07-03
Last update: Marcin Banaszek, 2023-09-29 more...
45 - P1393307
James Malcom
1627 Julias Fairies 22/06/2021
P1393307
(13+14) C+
BP in 18.0 (-:
Dummy Pawn Promotion
1. a4 f5 2. Ta3 f4 3. Th3 f3 4. g3 fxe2 5. Lg2 exd1=B 6. Lc6 dxc6 7. Ke2 Lg4+ 8. Ke3 e6 9. Se2 Lb4 10. Txd1 Lc3 11. dxc3 Sf6 12. Td5 Tf8 13. Ta5 Tf7 14. Ta6 Td7 15. a5 Td1 16. Ld2 Tg1 17. Le1 Tg2 18. Sd2 Dd3+
play all play one stop play next play all
Henrik Juel: What is the (-: trick, James? (2021-08-30)
James Malcom: Nothing special; merely the usual. (2021-08-30)
Henrik Juel: Ah, the old dummy pawn...
Why not spell it out in the stipulation? Not everybody knows 'the usual', and I had forgotten all about it (2021-08-30)
James Malcom: Done! (2021-08-31)
comment
Keywords: Dummy Pawn, Move Length Record, Schnoebelen Theme, Golden Age (Dummy Pawn), Prentos Theme (B), Ceriani-Frolkin Theme (B), Unique Proof Game
Genre: Retro
Computer test: Jacobi v0.7.5 in 24 hours by Michael Caullaud
FEN: rn2k3/ppp3pp/R1p1pn2/P7/6b1/2PqK1PR/1PPNNPrP/4B3
Input: James Malcom, 2021-08-30
Last update: A.Buchanan, 2023-08-04 more...
46 - P1393313
Michel Caillaud
James Malcom

1639 Julias Fairies 07/30/2021
P1393313
(14+13) C+
BP in 11.0
Dummy Pawn Promotion & Royal Dynasty
1. d4 a5 2. d5 a4 3. d6 a3 4. dxe7 Ta4 5. exf8=B Dh4 6. g4 Ke7 7. g5 Ke6 8. g6 Se7 9. gxh7 Txf8 10. h8=K Tg4 11. f4 Dxh8
play all play one stop play next play all
2 “special” Schnoebelen promotions in a single line
Henrik Juel: Definition of the Royal Dynasty condition from Schwalbe
Königsdynastie: Im Diagramm kann jede Partei keinen, einen oder mehrere Könige haben. Ein König ist genau dann königlich, wenn er der einzige König seiner Partei ist. Eine Bauernumwandlung in einen König (derselben Partei) ist erlaubt. Ein König darf nur dann rochieren, wenn er königlich ist und nicht gezogen hat, seit er zuletzt königlich wurde. Die anderen für die Rochade vorgeschriebenen Bedingungen bestehen weiter.
In this problem 10.h8=K makes both white kings non-royal, so 11.f4 is not an illegal self-check
The black king is royal throughout, so 5.exf8=KDTLS? would have given a disturbing check to him, leaving just 5.e8=B
It is nice that both conditions are invisible in the diagram, but they should be mentioned in the stipulation, I think (2021-08-30)
Henrik Juel: Euclide 1.01 reports no solutions in orthodox chess (2021-08-30)
Henrik Juel: in my first comment you should read 5.exf8=B, of course, not 5.e8=B (2021-08-30)
James Malcom: I forget to add the C+, and thank you for your comments. (2021-08-31)
Henrik Juel: Jacobi 0.7.5 in Heuristic Mode found the solution in 35 seconds
A full test required 917 seconds (2021-08-31)
Henrik Juel: Here is a way to use Jacobi:
1. Open the homepage https://wismuth.com/jacobi/latest/solver.html
2. Copy the following two lines to the rectangle for Text representation:
stipulation dia11.0 forsyth 1sb2r1q/1pppspp1/4k3/8/5Pr1/p7/PPP1P2P/RSBQKBSR
condition RoyalDynasty PromOnly P S B R Q K
3. Click on 'Set problem from text'
4. Click on Start (with Heuristic Mode marked, if you just want to find the solution)
5. When Jacobi ends, click on the solution to view it in the Game editor
. (2021-08-31)
James Malcom: For those who advocate N for knight, use "EnglishN" to avoid changing the FEN each time. (2021-08-31)
Henrik Juel: That sounds good, James
Exactly how do you do that? Where do you write EnglishN?
There is an output option called English-N, is that it?
Is there a similar trick to use in Popeye? (2021-08-31)
Henrik Juel: This works in Jacobi, but note the s in promonly
englishn
stipulation dia11.0 forsyth 1nb2r1q/1pppnpp1/4k3/8/5Pr1/p7/PPP1P2P/RNBQKBNR
cond RoyalDynasty PromOnly P s B R Q K
And what about Popeye? (2021-08-31)
James Malcom: Popeye is S only as far as I know. (2021-08-31)
comment
Keywords: Dummy Pawn, Royal Dynasty, Promotion (BK), Schnoebelen Theme (BK), Unique Proof Game, Prentos Theme (BK), Ceriani-Frolkin Theme (BK), Golden Age (Dummy Pawn)
Genre: Retro, Fairies
Computer test: Jacobi v0.7.5
FEN: 1nb2r1q/1pppnpp1/4k3/8/5Pr1/p7/PPP1P2P/RNBQKBNR
Input: James Malcom, 2021-08-30
Last update: A.Buchanan, 2023-08-04 more...
47 - P1393492
Eric Pichouron
Michel Caillaud

9003 Phénix 317-318 04-05/2021
2. Preis
PR Bernd Gräfrath
P1393492
(13+15) C+
BP in 15.0
1. e4 d5 2. Dg4 Lxg4 3. e5 Kd7 4. e6+ Kc8 5. exf7 e5 6. f4 Se7 7. f5 Sg6 8. f6 Le7 9. f8=D a5 10. De8 Ta6 11. Dc6 Txc6 12. f7 Tc3 13. f8=D c5 14. Df3 c4 15. Dd1 Lxd1
play all play one stop play next play all
Henrik Juel: Three white queens are captured by black officers (2021-09-05)
more ...
comment
Keywords: Antiphönix, Excelsior white, Homebase (w), Phoenix, Prentos Theme (DD), Pronkin Theme (D), Promotions to queens
Genre: Retro
Computer test: Natch 3.3
FEN: 1nkq3r/1p2b1pp/6n1/p2pp3/2p5/2r5/PPPP2PP/RNBbKBNR
Input: Gunter Jordan, 2021-09-05
Last update: Gunter Jordan, 2023-07-08 more...
48 - P1393552
Eric Pichouron
France-Echecs 2020
P1393552
(13+15)
BP in 15.0
1. e4 d5 2. Dg4 Lxg4 3. e5 Kd7 4. e6+ Kc8 5. exf7 e5 6. f4 Ld6 7. f8=S h5 8. Sd7 h4 9. Sb6+ axb6 10. f5 Sd7 11. f6 Kb8 12. f7 Ka7 13. f8=D Tb8 14. Df3 Ka8 15. Dd1 Lxd1
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Henrik Juel: C++ Euclide 1.01 (2021-09-07)
comment
Keywords: Antiphönix (DS), Ceriani-Frolkin Theme (S), Excelsior white, Prentos Theme (D), Pronkin Theme (D), Promotion (D), under-promotion (S)
Genre: Retro
FEN: kr1q2nr/1ppn2p1/1p1b4/3pp3/7p/8/PPPP2PP/RNBbKBNR
Reprints: III Phénix 317-318 04-05/2021
Input: Gunter Jordan, 2021-09-07
Last update: Gunter Jordan, 2021-09-07 more...
49 - P1394920
Andrey Frolkin
B3 WCCC Rhodes 10/2021
P1394920
(15+10)
Last 4 single moves?
R: 1. Lf4xSg3# Sh5-g3 2. Le3xLf4+ Sg3-h5
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then Lf4 to a1; a3-a2-a1=L; a2×Db3; Sg3 to b1; b3-b2-b1=S; b2×Lc3; c3×Td2
Judge Michel Caillaud: "The theme [of one piece capturing two promoted ones] in classical retro form, with the capturing piece not being a Pawn. The nice point is that -2.Lé3×Pf4+? doesn't work. The promoted Knight cannot reach a1 so it has to unpromote on b1 to unlock the cage and another promoted piece has to be produced to unpromote on a1."

Author Andrey Frolkin: "This one is superseded by P1400748 (Q+B) which is the official 1st HM. The predecessor (B+S) should be stored “for posterity” in case someone wants to compose more problems in which an officer captures 2 promoted pieces."
Henrik Juel: Black never captured, so the only way to explain the check from Lg3 seems to be
R: 1.Lf4xSg3+ Sh5-g3 2.Lg5xLf4+ Sg3-h5
and later the two uncaptured officers are unpromoted on a1 and b1 (2021-10-26)
A.Buchanan: new version in final report (2021-10-28)
A.Buchanan: Henrik may wish to update his analysis. My question: can't we just remove sBd7? (2021-10-29)
Henrik Juel: Now the solution is R: 1.Lf4xSg3+ Sh5-g3 2.Le3xLf4+ Sg3-h5
I see no immediate purpose for Pd7, but since both Andrej and Michel have accepted it, there probably is some reason for it (2021-10-29)
A.Buchanan: It’s not necessary, according to Andriy (2021-10-29)
Henrik Juel: OK
Another matter: I believe that Andrej prefers his first name to be spelled Andrey in english
This spelling is used in the WCCC-11 announcement and in the FIDE Album 2010-12 (2021-10-30)
A.Buchanan: Thanks Henrik. In the German field of the PDB author table, he is Andrij, and I've now changed the English name to match the French as Andrey. As recently as a year ago, I have seen him as Andriy in English articles which he has authored in Problemas (2021-10-30)
Henrik Juel: Rendering cyrillic names in a western language is extremely messy
Each western language has a 'standard' transliteration from russian cyrillic, but ukrainian and bulgarian cyrillic are slightly different from russian cyrillic
My bulgarian chess friend Nikolai/Nikolaj/Nikolay accepts any of those spellings, but he prefers Nikolay
Next time you write to Andrej/Andrij/Andrey/Andriy, you should ask him what he prefers, Andy...
I shall probably continue to use Nikolaj and Andrej, which seem most natural for me (2021-10-30)
A.Buchanan: I have a feeling that I did ask him before and he said that his favoured version is Andrey. On the receiving side, my only comment is that “iy” is a very rare bigram in English and almost never occurs. At least we all agree on the first 4 letters! (2021-10-30)
A.Buchanan: He should pick whichever spelling gives him the best anagram :) (2021-10-30)
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comment
Keywords: Last Moves? (4), Champagne-TT (2021), Type C, Ceriani-Frolkin Theme (sl), Prentos Theme (sl), Superseded by (P1400748)
Genre: Retro
FEN: 8/3p2p1/5NB1/4QRN1/4p2K/1PPP1PBP/2PpPPbk/4nrnr
Input: A.Buchanan, 2021-10-26
Last update: A.Buchanan, 2022-04-21 more...
50 - P1398612
Mark Thornton
R563 The Problemist 11/2020
P1398612
(15+13)
BP in 7.0
1. d3 g6 2. d4 Lg7 3. d5 Le5 4. d6 Sf6 5. dxe7 Tf8 6. exf8=L De7 7. Lxe7 Kxe7
play all play one stop play next play all
Henrik Juel: C+ Natch 3.1 (2022-01-23)
comment
Keywords: Antiphönix, Excelsior white, Homebase (w), Phoenix, Prentos Theme, Rückkehr nach Umwandlung (B/L), Tempo Loss
Genre: Retro
FEN: rnb5/ppppkp1p/5np1/4b3/8/8/PPP1PPPP/RNBQKBNR
Input: Gunter Jordan, 2022-01-23
Last update: A.Buchanan, 2023-06-03 more...
51 - P1399677
Andrew Buchanan
Discord Chess Problems & Studies Server 06/03/2022
P1399677
(15+13) C+
PG in 10.0
Economy record for what effect?
1. e4 d6 2. e5 Lg4 3. e6 h5 4. exf7+ Kd7 5. Sc3 De8 6. fxe8=S h4 7. Sxg7 Th5 8. Sf5 Ke6 9. Sg3 Te5+
10. Sg3e2! (sic) Sg3-e2 Txe2+
play all play one stop play next play all
A.Buchanan: So what's the idea, Henrik? (2022-03-07)
Henrik Juel: If the proof game were in 11 moves, White could just capture [Dd8,Pf7,Pg7] with Sc3, and leave [Pe2] standing
But in 10 moves the tempo is wrong for this plan, and it is corrected by a roundtrip by [Pe2] lasting 9 moves
Very good (2022-03-07)
A.Buchanan: Thank you Henrik, but this is not the theme. Another incidental feature is that every piece which moves more than once has an interrupted journey. But what is the purpose of wSc3, for example? (2022-03-07)
Henrik Juel: White has to move after 4... Kd7, and 5.Sc3 seems safe (2022-03-07)
A.Buchanan: Hint: 5.Sa3 would not be thematic (2022-03-07)
Henrik Juel: I give up
What's the (big) idea? (2022-03-07)
A.Buchanan: See recent discussion at P1399601. This is a shortest SPG that forces a full designation for a source square (W10) and then restores to standard material. This is also maybe possible for Queen or Bishop, but requires two promotions so is longer. It’s never possible for rook. Currently this corner case breaks the PDB animation. (2022-03-07)
Henrik Juel: OK... Points for a well hidden idea, I guess
10. Sg3-e2 should work fine for the animation
And for retro play full notation is standard (even for me, although it took a long time) (2022-03-07)
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comment
Keywords: Unique Proof Game, Economy record, Ceriani-Frolkin Theme (S), Prentos Theme (S), Pure Round Trip (9), Parity Argument, Tempo Loss
Genre: Retro
Computer test: C++ Euclide 1.01
FEN: rn3bn1/ppp1p3/3pk3/8/6bp/2N5/PPPPrPPP/R1BQKBNR
Input: A.Buchanan, 2022-03-07
Last update: A.Buchanan, 2022-03-07 more...
52 - P1404841
Silvio Baier
StrateGems 2011
1. ehrende Erwähnung
P1404841
(13+14) C+
BP in 18.0
1. d4 g5 2. d5 Lg7 3. d6 Kf8 4. dxc7 d5 5. a4 Dd7 6. a5 Dh3 7. a6 Lg4 8. axb7 a5 9. c8=L Ta6 10. Le6 Txe6 11. b4 Sa6 12. b8=L f5 13. Le5 Lxe5 14. b5 Sf6 15. b6 Tg8 16. b7 Tg6 17. b8=L Th6 18. Ld6 Lxd6
play all play one stop play next play all
Henrik Juel: C+ Euclide 1.01 (2022-10-03)
comment
Keywords: bi-coloured Bristol, black Bristol, Prentos Theme (LLL), Homebase, Ceriani-Frolkin Theme (LLL)
Genre: Retro
FEN: 5k2/4p2p/n2brn1r/p2p1pp1/6b1/7q/2P1PPPP/RNBQKBNR
Reprints: zu 18879 Die Schwalbe 316, p. 650, 08/2022
Input: Gunter Jordan, 2022-10-03
Last update: Silvio Baier, 2023-02-02 more...
53 - P1404842
Reto Aschwanden
18879 Die Schwalbe 313 02/2022
P1404842
(13+13) C+
BP in 18.0
1. f4 a5 2. f5 a4 3. f6 Ta5 4. fxg7 f5 5. gxh8=L Lh6 6. d4 Le3 7. d5 f4 8. d6 Tg5 9. dxc7 d5 10. c4 Dd7 11. c5 Dh3 12. c6 Le6 13. c8=L Sh6 14. c7 Sf7 15. Ld7+ Kxd7 16. c8=S h6 17. Sd6 Kxd6 18. Le5+ Kxe5 Dia
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Alle drei Prentos-Steine werden vom sK geschlagen.
Henrik Juel: cooked, e.g.
1. Bd2-d4 Ba7-a5 2. Bd4-d5 Ba5-a4 3. Bd5-d6 Sg8-h6
4. Bd6xc7 Bd7-d5 5. Bc2-c3 Lc8-e6 6. Dd1-d2 Dd8xc7
7. Bf2-f4 Dc7xc3 8. Bf4-f5 Dc3-h3 9. Bf5-f6 Ke8-d7
10. Bf6xg7 Bf7-f5 11. Dd2-a5 Sh6-f7 12. Bg7-g8=D Lf8-h6
13. Da5xa8 Lh6-e3 14. Da8-a6 Bf5-f4 15. Da6-d6 Kd7xd6
16. Dg8-c8 Kd6-e5 17. Dc8-c2 Th8-g8 18. Dc2-d1 Tg8-g6 (2022-10-03)
Mario Richter: The black rook is on g5 (and not on g6)! - diagram is now corrected. (2022-10-04)
Henrik Juel: Thanks, Mario
The same cook works with 18... Tg8-g5, so there may be more diagram errors (2022-10-04)
Mario Richter: You are right, Henrik, I overlooked that a black pawn is on h6 and not on h7, I changed zhe diagram accordingly. (2022-10-04)
Henrik Juel: Now C+ Euclide 1.01 (2022-10-04)
Henrik Juel: Actually C++ (meaning no solution in 17.5, and surely no shorter solution) (2022-10-04)
comment
Keywords: bi-coloured Bristol, Prentos Theme (LLS), Homebase
Genre: Retro
Computer test: Solving time: Natch 3.3: 2:09min, Euclide 1.11: 2:12min, Stelvio 1.14: 6sec
FEN: 1n6/1p2pn2/4b2p/3pk1r1/p4p2/4b2q/PP2P1PP/RNBQKBNR
Input: Gunter Jordan, 2022-10-03
Last update: Reto, 2023-03-25 more...
54 - P1407485
Janos Mikitovics
Gabor Tar

P0521 StrateGems 96, p. 190, 10-12/2021
P1407485
(11+13) C+
BP in 11.5
1. c4 f5 2. c5 f4 3. c6 f3 4. cxb7 fxg2 5. bxa8=L gxf1=S 6. Lg2 Sxh2 7. Sf3 Sg4 8. 0-0 Se3 9. Kh2 Sxf1+ 10. Kh3 Sxd2 11. Dg1 Sf1 12. Lxf1
play all play one stop play next play all
Henrik Juel: C+ Stelvio 1.0 (2023-01-31)
comment
Keywords: Unique Proof Game, Prentos Theme (s), Pronkin Theme (L), Castling, Switchback (s), Round Trip (s-4)
Genre: Retro
FEN: 1nbqkbnr/p1ppp1pp/8/8/8/5N1K/PP2PP2/RNB2BQ1
Input: Gunter Jordan, 2023-01-30
Last update: Gunter Jordan, 2023-01-30 more...
55 - P1408151
Bernd Graefrath
R590 The Problemist 05/2022
P1408151
(10+11) C+
BP in 10.0
1. f4 b5 2. f5 b4 3. f6 b3 4. fxe7 bxc2 5. exf8=L cxb1=S 6. Lxg7 Sxd2 7. Lxh8 Sxf1 8. Lf6 Sxh2 9. Txh2 Dxf6 10. Th1 Df1+
play all play one stop play next play all
more ...
comment
Keywords: Homebase (w), Prentos Theme (Ls), Switchback (T)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.6 in 28:23:47 Stunden. (hh:mm:ss) Keine Lösung: BP 9.0. Popeye 4.90 braucht ca. 63 Std.
FEN: rnb1k1n1/p1pp1p1p/8/8/8/8/PP2P1P1/R1BQKqNR
Input: Gunter Jordan, 2023-03-09
Last update: A.Buchanan, 2023-12-16 more...
56 - P1409844
Bernd Graefrath
5 Phénix 331, p. 12922, 06/2022
P1409844
(13+12) C+
PG in 10.0
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. gxh8=S bxa1=D 6. Sxf7 De5 7. Sxd8 Dh5 8. Sc6 Sxc6 9. Lb2 Sa7 10. Lh8 Lg7
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, RIFACE Retro Solving Tourney (2022), Promotion (Sd), Ceriani-Frolkin Theme (S), Prentos Theme (S), Prenix (d)
Genre: Retro
Computer test: C+ by Euclide 1.01, who found no solutions in 9.5 and 9.0 moves
FEN: r1b1k1nB/npppp1bp/8/7q/8/8/P1PPPPP1/1N1QKBNR
Input: A.Buchanan, 2023-05-20
Last update: A.Buchanan, 2023-05-20 more...
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