Die Schwalbe

8 problem(s) found in 8620 milliseconds (displaying 8 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND G='Fairies' AND K='Dummybauer'] [download as LaTeX]

1 - P1379502
Andrew Buchanan
1127 Julias Fairies 19/09/2016
P1379502
(2+2) C+
h=3
Chess4E71
1. h1 Kf2 2. Kh3 Sf7 3. Kh2 Sg5=
play all play one stop play next play all
Author's solution: Schema problem to show the idea. At first glance, h=3 seems completely impossible, even without the confusing fact that Black to move is apparently checking White. But this absurdity is what renders the problem solvable.

Law A1.2 tells us that if the player to move is already apparently checking or even checkmating the opposing king, then he is not allowed to capture that king, and must make another move. The assessment whether the opponent is actually checked or mated is made only when the opponent has the move. In normal chess, such a position is illegal, but it is no more and no less illegal than say wBa1 wPb2. Law A1.2, tells us that we can still play chess. (See Lese Majeste)

In Chess4E71 such "illegal" checks can clearly occur, but only in the starting position. Therefore no moves have been made in the game so far. In particular, bPh3 has never moved. Now Article 3.7b of the Laws of Chess says: "on its first move the pawn [...] may advance two squares along the same file, provided that both squares are unoccupied. So 1. h3-h1! is legal.

Now what happens to the pawn when it arrives on h1? Again we consult the Laws. Article 3.7e says: "When a player, having the move, plays a pawn to the rank furthest from its starting position, he must exchange that pawn as part of the same move for a new queen, rook, bishop or knight of the same colour on the intended square of arrival." The pawn began on the 3rd rank, so it would only promote when it reaches the furthest rank, namely the 8th rank (which it never can attain, under orthodox rules, but that's irrelevant). When it arrives on the 1st rank, it merely remains a pawn. I can almost hear the groans :-)

The rest of the problem solves itself. Or an engine does.

The recognition that BTM is delivering check in what must be the starting position is hardly retro reasoning, so the Article 17A bell does not sound to awake the demon of the Dead Position rule from his slumbers. Hence with a forward stipulation, we don't worry that there is no mate possible after B1 move.
Henrik Juel: groan (2020-08-30)
A.Buchanan: Hark, what’s that I hear? :-) (2020-08-31)
James Malcom: Hark, I hear the angels groan! Oh snark, I head their echos spawn!:-) (2020-08-31)
A.Buchanan: Jacobi does not yet support dummy pawns, alas (2021-05-11)
more ...
comment
Keywords: Chess4E71, Lese Majeste, Dummy Pawn, Minimal, Miniature, Dead Position (not!), Golden Age (Dummy Pawn)
Genre: Fairies
Computer test: HC+ Popeye v4.87. No solution in diagram position for h#3 & 1 solution after key as h#2.5. Only other solution might be if B2 or B3 is h1 without promotion. But bK can only be without a move if in corner or adjacent to bP, which cannot happen after 1. Kg5,Kh5?
FEN: 8/8/7N/8/7k/7p/6K1/8
Input: A.Buchanan, 2020-08-30
Last update: A.Buchanan, 2023-08-04 more...
2 - P1381700
A. H. Bobbins
154 American Chess Magazine Vol. 1, p. 443, 12/1897
P1381700
(6+3)
=2 durch Schwarz

Black forces a draw in two moves
1. ... c1=wL!
2. Sb1 axb1=wL! Patt
2. Db1+ axb1=B! Patt
play all play one stop play next play all
James Malcom: I've added in the solution now. (2020-11-11)
comment
Keywords: Joke promotion, under-promotion key, konsekutive Umwandlungen 2 (LL, Lb), Dummy Pawn, Golden Age (Dummy Pawn)
Genre: Fairies
FEN: 8/P7/8/5B2/8/K1NQ4/pPp5/k7
Input: James Malcom, 2020-11-10
Last update: A.Buchanan, 2023-08-04 more...
3 - P1381916
James Malcom
PDB Website 14/11/2020
P1381916
(13+9)
s#11
(-:
1. h8=T+! Sh6 2. exd8=K! b3 3. a8=sS! b2 4. b8=sL! La7 5. e4 Lb8 6. e5 La7 7. e6 Lb8 8. e7 La7 9. e8=B! Lb8 10. Ta4 La7 11. Txa7 g4#
play all play one stop play next play all
A rather... complicated "joke."
A.Buchanan: If one allows promotion to sB (and there seems no reason to disallow it since promotion to pawn, king and foreign units are allowed) then the problem is cooked. There is no universally agreed notion of how a pawn can move if it starts on the first rank. Does it get a double hop, and if so on which rank? But the problem is unsound in any case. (2022-02-10)
James Malcom: That is if, yes. But I don't think this problem ought to be left as is: a demonstration of the levels of absurdity and tomfoolery old rules used to allow. Promotion to a piece of another color and dummies were loopholes, yes, but promotion to a black pawn was never included, not even implicitly. All pawns are pieces, but not all pieces are pawns. (2022-02-10)
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comment
Keywords: Joke promotion (Ksl), Dummy Pawn, konsekutive Umwandlungen 5 (TKslB), under-promotion key (T), Excelsior white, Golden Age (Dummy Pawn), Illegal position (no wK), Joke
Genre: s#, Fairies
Computer test: Difficult to test at the moment because no engine allows both normal and adversarial promotion.
FEN: 2Rr2n1/PPpBP2P/1pP5/1N4pk/1p4Rb/6pP/4P1P1/1Q6
Input: James Malcom, 2020-11-14
Last update: A.Buchanan, 2023-12-11 more...
4 - P1389065
Erich Bartel
3353 Scobs lignea 29/04/2021
P1389065
(1+2) C+
ser-s=9
Platzwechselcirce
Kürzestzüger
sSr=Drache
1. Ka8-b7 2. Kb7-c6 3. Kc6-d5 4. Kd5-d4 5. Kd4xd3[+sDCd4] 6. Kd3-d2 7. Kd2-d1 8. Kd1xc1[+sBd1=L] 9. Kc1xd1[+sLc1] DCd4-d3=
play all play one stop play next play all
more ...
comment
Keywords: Seriesmover, Circe (Platzwechsel-), Minimummer, corner to edge (a8d1), Dummy Pawn
Pieces: sr = Dragon (DC)
Genre: Fairies
Computer test: %Popeye FreeBSD-9.1-RELEASE-amd64-64Bit v4.59
FEN: K7/8/8/8/8/3*1n4/8/2p5
Input: Erich Bartel, 2021-04-29
Last update: A.Buchanan, 2023-12-11 more...
5 - 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...
6 - P1398987
Ado Kraemer
Andrew Buchanan

PDB Website 10/02/2022
AK, correction AB
P1398987
(2+8)
#3
(-:
hint rot13.com:qrynl pubvpr bs cebzbgrq havg
1. "b8..."
1. ... g2 "...=S!" 2. Sd7 g3 3. Sf6#
1. ... h2 "...=D!" 2. Df8 Th3 3. Dxh6#
play all play one stop play next play all
If White were prescient, they could choose which unit to promote to, based on knowledge of Black's next move. As it is, White plays 1.b8, then only chooses the promotion officer when Black's response is known.
Supersedes the dualized and inexact P1373527
White waits for Black to move before selecting the promoted unit.
Under this joke, a dummy pawn exists ephemerally, but not via the Dummy Pawn rule.
Position comfortably legal.
Henrik Juel: Andrew, how does one decode the rot13 hint? (2022-02-10)
Henrik Juel: Never mind, Andrew; write the english alphabet in two rows and code/decode between rows
abcdefghijklm
nopqrstuvwxyz
so the gobbledygook translates to
delay choice of promoted unit (2022-02-10)
Henrik Juel: ... the rows should be written with a fixed font, of course, but I do not know how to accomplish this in a PDB comment (2022-02-10)
A.Buchanan: Hi Henrik: got to rot13.com and put the text in the input box, read it from the output box. Because 13=26/2, this works for both encryption and decryption.
Trying to do this for new jokes to create a level playing field. If you want a hint as to the silly trick, but would still enjoy solving the chess afterwards, then check out the rot13. (2022-02-10)
A.Buchanan: The real challenge is getting animation to work properly in this site. (2022-02-10)
more ...
comment
Keywords: Joke (delayed promotion), Minimal, Dummy Pawn (not! Delayed promo)
Genre: Fairies
FEN: 8/1P5K/6pp/6pk/6pr/6pp/8/8
Input: A.Buchanan, 2022-02-10
Last update: A.Buchanan, 2023-05-21 more...
7 - P1400191
James Malcom
Andrew Buchanan

PDB Website 02/04/2022
P1400191
(8+7) C+
r#4
1. bxa8=B! f1=B 2. e8=B d1=B 3. Le1 Sc2 4. Lb1 Te3#
play all play one stop play next play all
More economical version of P1375039
James Malcom: I had a thought looking at this again. Does n7/1P2P3/Q3P3/1r6/N1k1KP2/Pr6/B2p1p2/n7 work to save another piece? (2022-04-02)
A.Buchanan: James, yes your version does save another unit for your lovely idea. Beyond this, a version n7/1P2P3/Q7/Br6/2kPKP2/1r6/B2p1p2/n7 saves another unit, and forces a unique order on the Black promotions too. To avoid distracting unachievable threats, set NoThreat as well as the usual NoShortVariations. Your composition has driven me finally to report a long-standing Olive bug that cruelly punishes we Dummy Pawn enthusiasts: https://github.com/dturevski/olive-gui/issues/54. (2022-04-03)
James Malcom: Thanks for the verification and shaving off a unit, Andrew. (2022-04-03)
more ...
comment
Keywords: Dummy Pawn, Golden Age (Dummy Pawn), Superseded by (P1411297)
Genre: Fairies, r#
Computer test: Henrik Juel: C+ Popeye 4.87 (2022-04-02)
FEN: n7/1P2P3/Q7/Br6/2kPKP2/1r6/B2p1p2/n7
Input: James Malcom, 2022-04-02
Last update: A.Buchanan, 2023-12-14 more...
8 - P1411297
James Malcom
Andrew Buchanan

OP020 The Hopper Magazine I02 25/6/2022
P1411297
(9+9)
r#6 Dummy Pawn Rule
SCHRECKE: C+, popeye 4.87
1. Da6! droht 2. f4 h1=D,L#
1. ... h1=B! 2. bxa8=B! g4!
3. f4 droht 4. Lxd2 droht 5. Le1 fxe1D,T#
3. ... f1=B! 4. e8=B! d1=B!
5. Le1 Sc2 6. Lb1 Te3# (2023-09-09)
comment
Keywords: Dummy Pawn, Golden Age (Dummy Pawn)
Genre: r#, Fairies
FEN: n7/1P2P3/7Q/Br4p1/2kPK3/1r3PP1/B2p1p1p/n7
Input: Miguel Ambrona, 2023-07-27
Last update: James Malcom, 2023-09-09 more...
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The problems of this query have been registered by the following contributors:

A.Buchanan (2)
James Malcom (4)
Erich Bartel (1)
Miguel Ambrona (1)