Die Schwalbe

3 problem(s) found in 5742 milliseconds (displaying 3 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='Reiner Rundlauf' 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
play all play one stop play next play all
A.Buchanan: Solved in YouTube: https://www.youtube.com/watch?v=jtEu5g7rUVs (2022-02-17)
comment
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 - 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)
more ...
comment
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...
3 - 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)
more ...
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...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (1)
A.Buchanan (2)