Die Schwalbe

16 problem(s) found in 3969 milliseconds (displaying 16 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND G='Retro' AND K='goldenes Zeitalter'] [download as LaTeX]

1 - P0000598
Nikita M. Plaksin
Andrej N. Kornilow

3876 Die Schwalbe 74 04/1982
P0000598
(4+3)
h=2 (AP)
Circe, Monochromes Schach
Intended solution:
1. dxc3ep[+wBc2] 0-0 2. axb1=S Kh2=
2. ... Kf2? 3. Kf3!
1. ... Tf1? 2. axb1=S Kf2? 3. Kf3!
play all play one stop play next play all
Erich Bartel: vom Dual 2.-- Kf2/Kh2 abgesehen C+ PY V4.41.--- (2008-11-07)
A.Buchanan: This is cooked in Popeye because White can't castle as long as bK controls f1! This is quite reasonable behaviour in monochrome: compare to en passant! So no solution (2022-02-18)
comment
Keywords: a posteriori (AP) (Type Petrovic), Circe, En passant as key, Monochromatic Chess, Castling (wk), Miniature, Golden Age (Monochrome castling)
Genre: Retro, Fairies
FEN: 8/8/8/8/2Pp4/8/p3k3/1N2K2R
Reprints: (IV) Quartz 4 1997
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-02-18 more...
2 - P0008784
Niels Høeg
The Chess Amateur 07/1926
P0008784
(1+1)
Längste BP ohne Schach. Welches war der letzte Zug?
R: 5899. Kg2xTh1
play all play one stop play next play all
The game ends after 50 consecutive moves without captures or pawn moves (loss of castling right is not included here), or when there is not enough material to mate (say K-K or K-KS). There are 30 captures and 96 pawn moves (including 8 pawn captures) available, so the longest game seems to last (30+96-8)x50=5900 moves. This cannot be achieved because of the move-loss when the draw-preventing move shifts between white and black. Niels Høeg believed that 2 moves were lost and stated the solution as 5898.- Kb7xTa8. Karl Fabel later showed that only 1.5 moves need be lost.

Since 1926, there have been some relevant innovations to rules and conventions
(1) 50 move rule applies only to retro compositions, and will trigger automatically (no issue with writing down the move). (Codex 1953?)
(2) Removal of rules about draw by insufficient material (Laws 1997)
(3) Dead position rule introduced (Laws 1997)
(4) 75 move rule introduced (Laws 2014)
(5) Dead position rule applies only to retro compositions (Codex 2015)
(6) Articles 9.2 & 9.3 apply to chess problems - this includes 50 move rule and excludes 75 move rule (Codex 2019)

This is certainly a composition rather than a question about over the board chess. And it is certainly a retro composition. So the 50 move rule will dominate the 75 rule. The standard interpretation of interaction between 50 move rule and Dead Position in compositions is that Dead Position assessment *is* aware of looming automatic draw by 50 moves. (Note there is a similar assessment for interaction between Dead Position and Draw by Repetition.)

So we can argue that the game cannot last to 5898.5 moves, because the final move leads to a mandatory draw: either the king captures the last officer, or the king avoids the capture and the game ends in draw under the 50 move rule. So the position is dead at 5898.0. But even 5898.0 is too long for the diagram position with the kings so far apart. In the alternate reality if the last capture of a rook does not take place, there must be sufficient moves left for the kings to come together so that the rook can deliver checkmate. This will take at least 6.0 moves.

There is also still an ambiguity in the rules as to whether checkmate overrides draw by 50 moves. This is explicitly mentioned in the 75 move rule, but not in 50 move rule. I assume that checkmate *does* take priority.

Or does a valid problem only exist in the context of the rules and conventions that pertained at the time of its composition? The Codex does not opine on this general point.

Compare P1331022

Duplicate Diagram: P1101148, P1189676, P1191185, P1304589

A.Buchanan: There's a question whether DP rule has visibility of 3Rep & 50M state. The current consensus among most of the tiny group who might care is that for retros, it does have visibility, but for purely forward problems, it does not. This align with the idea that by default 50M & DP rules apply only to retros (2023-09-06)
A.Buchanan: The old intended interpretation is protected under the Golden Age principle. Suppose we do apply modern rules, codex & clarifications. If Black just played Kb7xRa8, then the alternative leading to mate takes 7.0 moves, so this must have been Black's 5892nd move at the latest. If White just moved, then it was White's 5892nd at latest. So to maximize the length of the game, Black moved last. (2023-09-06) edit (2023-09-06)
more ...
comment
Keywords: Longest Proof Game, Last Move?, only Kings, Non-Unique Proof Game, Dead Position, 50 move rule, Constrained problem, Type A, Miniature, Golden Age (pre-dead), Aristocrat
Genre: Mathematics, Retro
FEN: k7/8/8/8/8/8/8/7K
Reprints: Schackproblemet 1928
Schach und Zahl 1966
Input: Gerd Wilts, 1997-06-20
Last update: A.Buchanan, 2024-01-18 more...
3 - P1375084
Edward Nathan Frankenstein
4 British Chess Magazine , p. 21, 1883
P1375084
(4+3)
Add one Black man, and White mates in three moves
(+sBd1, dann) 1. Kf5 Kd3 2. De4+ Kd2 3. Lh6#
play all play one stop play next play all
Add a black pawn on d1, then ...
Henrik Juel: After the addition of sPd1, C+ Popeye 4.61 (2022-01-26)
Henrik Juel: Other variations
1... Kc4/Ke3 2.Dc2+/Lb4 (2022-01-26)
comment
Keywords: Dummy Pawn, Golden Age (Dummy Pawn), Add pieces (b)
Genre: 3#, Retro
FEN: 5B2/8/6K1/1p6/3k4/6p1/1P4Q1/8
Input: James Malcom, 2020-04-27
Last update: A.Buchanan, 2023-08-04 more...
4 - 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!
play all play one stop play next play all
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)
more ...
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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...
5 - 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
play all play one stop play next play all
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)
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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...
6 - 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 ...
comment
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...
7 - P1382808
Ronald Turnbull
Andrew Buchanan

PDB Website 20/01/2012
RT, correction AB
P1382808
(4+12)
h#3
AP
PRA
1. bxc3ep 0-0! (for AP reasons, not 1...Kf2?/Th2? etc) 2. Ta1 Txa1 3. Kc4 Txa4#
1. fxe3ep 0-0! (for AP reasons, not 1...Tf1?/Txh3? etc) b2 Txf3 3. Tc3 Tf4#
play all play one stop play next play all
For AP as for anything else, the default meta-convention is PRA before RS. Here we use AP to lock down wK & wTh1, so the last move was R: 1. c2-c4 or 1. e2-e4. There is a different h#3 in either case, beginning with ep and then 0-0.
Chessically corrects P1012059 following discussions. It's doubtful that AP logic works as simplistically described here, so this may still be unsound logically. Nevertheless, might as well fix the chess!
See P1399112, where the two parts each prove that one side of White castling rights remain. If this is correct, and only *one* part is required per castling, this implies that this Turnbull-Buchanan problem doesn’t work. For one part we have solution c_S and tries c_T1 & c_T2. In the other part, solution e_S and tries e_T1 & e_T2. Any of 5 combinations work:
c_S + e_S
c_S + e_T1
c_S + e_T2
c_T1 + e_S
c_T2 + e_S
because they all confirm that White retains castling rights.
Classify this problem as Golden Age because it’s on the wrong side of the evolving standard.
A.Buchanan: Let ??? Indicate respectively that w00, c ep & e ep are ok. Then YYN, YNY, NYN, NNY, NNN are the contenders.
Under PRA we reduce to YYN, YNY & NNN but the last has no solution so not the right paradigm.
Under SPRA with AP we reduce to YYN, YNY. Each considered as a separate part has kind of AP h#3, but I don’t understand how consolidation would take place over PRA anyway
Under RS with AP, we have 2 solutions assuming again that no consolidation. (2022-03-23)
comment
Keywords: a posteriori (AP) (Type Petrovic - cee), En passant as key (2), Castling (wk), Retro Strategy (RS), Golden Age (AP unconsolidated)
Genre: h#, Retro
Computer test: Forward logic sound by Popeye v4.85 However, seems that AP logic is not sound
FEN: 8/8/8/1nr1n3/ppPkPp2/rp1p1p1p/8/4K2R
Input: A.Buchanan, 2020-12-08
Last update: A.Buchanan, 2023-04-06 more...
8 - P1387362
Manfred Zucker
Freie Presse (Chemnitz) 24/06/1977
P1387362
(1+1)
Wie viele verschiedene letzte Züge sind möglich?
29 Lösungen
play all play one stop play next play all
Gefragt war natürlich nach dem letzten Einzelzug. Nun kann zuletzt sowohl der weiße als auch der der schwarze König gezogen haben. Der weiße König kann von drei verschiedenen Feldern (a2,b1,b2) gekommen sein, und er kann auf a1 eine schwarze Dame, einen schwarzen Turm, einen schwarzen Läufer, einen schwarzen Springer oder nichts geschlagen haben, das sind 3x5=15 Möglichkeiten. Dasselbe trifft auf den schwarzen König zu, insgesamt ergeben sich so 30 Möglichkeiten für den letzten Zug - und doch ist diese Lösung nicht richtig! Die Stellung wKb2-sLa1 ist partiemöglich (letzte Züge: 1. ... a2-a2=L+! 2. Kxa1), die Stellung sKg2-wLh1 jedoch nicht, denn der weiße Läufer kann (bei schwarzer Königsstellung auf g2) auf keine Weise nach h1 gekommen sein! Diese partieunmögliche Stellung war also zu subtrahieren, das richtige Ergebnis mußte "29" lauten.

Duplicate Diagram: P1207607

Dazu schreibt die FP: "Wie viele verschiedene letzte Züge sind möglich? Noch ein kleiner Hinweis: Beachten Sie beim Zählen bitte auch, daß die Könige zuletzt geschlagen haben können.".

(MZ433)
.
Henrik Juel: solution
2x3x5 - 1 = 29
R: Kg2xLh1 is illegal (2021-03-12)
A.Buchanan: This preceded the DP rule by 20 years, so under “Golden Age” principle, that rule does not apply, although it would be sound either way. Under DP rule there would have been 2x2x3=12 possible last moves, as a rook or queen must have just been captured (2021-03-13)
A.Buchanan: Is an only kings position an aristocrat or a kindergarten? :) Is it a one liner? :) I think the answer should be no, no and no (2021-03-13)
comment
Keywords: Aristocrat, Miniature, only Kings, Golden Age, Last Move?, Symmetrical position, Asymmetrical solution
Genre: Retro, Mathematics
FEN: 8/8/8/8/8/8/8/K6k
Input: Felber, Volker, 2021-03-12
Last update: A.Buchanan, 2021-03-13 more...
9 - 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...
10 - 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...
11 - P1408361
Andrew Buchanan
2 Problemas 36, p. 1189, 10/2021
P1408361
(15+13) C+
PG in 8.0
1. e4 Sf6 2. Ke2 Sd5 3. exd5 g5 4. d6 Lh6 5. dxc7 0-0 6. cxb8 Da5 7. Ke3 g4+ 8. f4 gxf3ep+
play all play one stop play next play all
Objective: record achievement of task. Promotion can be to either minor officer, but prefer to keep the "stem cell" to avoid arbitrary choice of non-standard material.
more ...
comment
Keywords: Unique Proof Game, Dummy Pawn (in diagram), Valladao Task, Golden Age (Dummy Pawn), Castling (sk), En passant
Genre: Retro
Computer test: HJ: with wSd8 C+ Stelvio 1.0
FEN: rn1P1rk1/ppp2p1p/3p1n1b/8/8/4Kp2/PPPP2PP/RNBQ1BNR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-08-04 more...
12 - P1408362
Andrew Buchanan
2 Problemas 36, p. 1189, 10/2021
P1408362
(15+13) C+
PG in 8.0
1. e4 Sf6 2. Ke2 Sd5 3. exd5 g5 4. d6 Lh6 5. dxc7 0-0 6. cxb8 Da5 7. Ke3 g4+ 8. f4 gxf3ep+
play all play one stop play next play all
Objective: record achievement of task. Promotion can be to any officer, but prefer to keep the "stem cell" to avoid arbitrary choice of non-standard material.
more ...
comment
Keywords: Unique Proof Game, Dummy Pawn (in diagram), Valladao Task, Golden Age (Dummy Pawn), Castling (sk), En passant
Genre: Retro
Computer test: HJ: with wSb8 C+ Stelvio 1.0
FEN: rPb2rk1/pp1ppp1p/7b/q7/8/4Kp2/PPPP2PP/RNBQ1BNR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-08-04 more...
13 - P1408363
Andrew Buchanan
3 Problemas 36, p. 1189, 10/2021
P1408363
(15+13) C+
PG in 8.0
1. d4 Sf6 2. Kd2 Se4+ 3. Ke3 Sc5 4. dxc5 g5 5. c6 Lh6 6. cxb7 0-0 7. bxc8 g4+ 8. f4 gxf3ep+
play all play one stop play next play all
Objective: record achievement of task. Promotion can be to any officer, but prefer to keep the "stem cell" to avoid arbitrary choice of non-standard material.
more ...
comment
Keywords: Unique Proof Game, Dummy Pawn (in diagram), Valladao Task, Golden Age (Dummy Pawn), Castling (sk), En passant
Genre: Retro
Computer test: HJ: with wSc8 C+ Stelvio 1.0
FEN: rnPq1rk1/p1pppp1p/7b/8/8/4Kp2/PPP1P1PP/RNBQ1BNR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-08-04 more...
14 - P1408364
Andrew Buchanan
4 Problemas 36, p. 1189, 10/2021
P1408364
(15+12) C+
PG in 8.0
1. d4 Sc6 2. Kd2 Se5 3. dxe5 Sf6 4. exf6 g5 5. fxe7 Lh6 6. exd8 0-0 7. Ke3 g4+ 8. f4 gxf3ep+
play all play one stop play next play all
Objective: record achievement of task. Promotion can be to either minor officer, but prefer to keep the "stem cell" to avoid arbitrary choice of non-standard material.
more ...
comment
Keywords: Unique Proof Game, Dummy Pawn (in diagram), Valladao Task, Golden Age (Dummy Pawn), Castling (sk), En passant
Genre: Retro
Computer test: HJ: with wSd8 C+ Stelvio 1.0
FEN: r1bP1rk1/pppp1p1p/7b/8/8/4Kp2/PPP1P1PP/RNBQ1BNR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-08-04 more...
15 - P1408365
Andrew Buchanan
5 Problemas 36, p. 1189, 10/2021
P1408365
(15+14) C+
PG in 8.0
1. f4 e6 2. f5 Lc5 3. f6 Se7 4. fxe7 Lb6 5. exd8 c5 6. Kf2 0-0 7. Ke3 c4+ 8. d4 cxd3ep+
play all play one stop play next play all
Objective: record achievement of task. Promotion can be to either minor officer, but prefer to keep the "stem cell" to avoid arbitrary choice of non-standard material.
more ...
comment
Keywords: Unique Proof Game, Dummy Pawn (in diagram), Valladao Task, Golden Age (Dummy Pawn), Castling (sk), En passant
Genre: Retro
Computer test: HJ: with wSd8 C+ Stelvio 1.0
FEN: rnbP1rk1/pp1p1ppp/1b2p3/8/8/3pK3/PPP1P1PP/RNBQ1BNR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-08-04 more...
16 - P1408366
Andrew Buchanan
6 Problemas 36, p. 1189, 10/2021
P1408366
(15+14) C+
PG in 8.0
1. f4 d5 2. f5 Ld7 3. f6 Lc6 4. fxe7 Sd7 5. exf8 Dg5 6. Kf2 0-0-0 7. Kf3 d4+ 8. e4 dxe3ep+
play all play one stop play next play all
Objective: record achievement of task. Promotion can be to either minor officer, but prefer to keep the "stem cell" to avoid arbitrary choice of non-standard material.
more ...
comment
Keywords: Unique Proof Game, Dummy Pawn (in diagram), Valladao Task, Golden Age (Dummy Pawn), Castling (sg), En passant
Genre: Retro
Computer test: HJ: with wSf8, C+ Stelvio 1.0
FEN: 2kr1Pnr/pppn1ppp/2b5/6q1/8/4pK2/PPPP2PP/RNBQ1BNR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-08-04 more...
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