Die Schwalbe

3 problem(s) found in 8783 milliseconds (displaying 3 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='Scherzaufgabe' AND K='Dummybauer'] [download as LaTeX]

1 - P0008793
Andrej N. Kornilow
Shakhmaty v SSSR 1978
P0008793
(15+8)
#1.5
a) 1. "Ta1-d1+?" ... Td4 2. Txd4# (Completing the illegal castling!)
b) 1. "xc5ep+?" ... Tb5 2. Txb5# (Completing the illegal e.p.!)
c) 1. "xe8=S+?" ... e6 2. Sf6# (Completing the illegal promotion!)

0) 1. Sxe7+! Lxe7 2. f8=B# (Truncating the promotion move!)
play all play one stop play next play all
n in directmate stipulation #n means that White has n moves to do the job. With n=1.5, therefore, one of the White moves is fractional, so we know we are in the realm of jokes, ho ho!

If White's first move is the fractional one, there are three retro tries which attempt to complete: castling, ep & promotion. However all are illegal:
castling: 8 white pawns, so wTa5 came from h1, dislodging wK.
ep: retracting sBc5 to c7 means wLb8 is promoted, but 8 white pawns.
promotion: white made 7 pawn captures, while sBgh were waylaid.

So we consider that White's second move was the fractional one, by omitting the replacement of wBf8 by an officer.
Henrik Juel: Completing the key isn't legal, 1.'Rd1'/'-bPc5'/'e8S'+, but omitting the promotion in the mating move is, 1.Sxe7+ Bxe7 2.'f8'#. Excellent joke. (2003-09-19)
James Malcom: A very witty joke Valladao! (2020-09-24)
A.Buchanan: Really like this joke (2020-09-25)
Henrik Juel: To see the illegality of completing 1.fxe8=S+?, note the captures:
Black captured fxDe, so [Pg7,h7] were captured on their files, while the other six missing black men were captured by white pawns
The illegality of completing 1.0-0-0,bxc6ep? is rather obvious (2020-09-26)
James Malcom: And for those you don't find it obvious: If the White king hasn't moved, then where did wRa5, and wBb8 if bPb5 has just done a double-step, come from? Neither can be promoted pieces, as White still has all eight pawns. Trying to finish castling and en passant therefore both produce illegal positions and thus cannot be the solution. (2020-09-26)
Henrik Juel: Continuing beating the dead horse...
How does the white player actually perform an entire move?
1.0-0-0+: Ke1-c1 and Ta1-d1
1.bxc6ep+: Pb5-c6 and remove sPc5
1.fxe8=S+: remove sYe8 and Pf7-e8 and replace wPe8 with wSe8 (three fractional actions)
2.f8=Y#: Pf7-f8 and replace wPf8 with wYf8
So a marginally better stipulation might be: 'White to move mates in less than 2 moves' (2020-09-26)
A.Buchanan: Hurray I've got the animation working! I agree with Henrik's stipulation. There is a dummy pawn on f8, but not by the Dummy Pawn rule. Instead it's the joke that does it. If Dummy Rule applied, the move would be full length! :) (2022-02-09)
more ...
comment
Keywords: En passant, Start a move but do not finish it, Castling, Promotion (S,B), Valladao Task (half!), Joke (End move, Start move), Dummy Pawn (not! Start move), Complete an unfinished move, waylaid (sBgh)
Genre: Retro, 2#
FEN: 1B1N1bB1/p2ppP2/2P5/R1pk1N2/1r2p3/1P2P1P1/4PP1P/R1K5
Reprints: (III) Quartz 4 1997
Input: Gerd Wilts, 1997-06-21
Last update: A.Buchanan, 2023-04-08 more...
2 - 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)
more ...
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...
3 - 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...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (1)
James Malcom (1)
A.Buchanan (1)