Die Schwalbe

4 problem(s) found in 2151 milliseconds (displaying 4 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='Konstruktionsrekord' AND G='n#'] [download as LaTeX]

1 - P1181668
Aleksey Khanyan
Tim Krabbé's Website #267 24/01/2008
P1181668
(13+13)
#12
1. ... Sdf4+ 2. Texf4+ Se2xf4+ 3. Tdxf4 Se6xf4+ 4. Tbxf4+ Sg2xf4+ 5. Taxf4+ Sg6xf4+ 6. Tf3xf4+ Sh3xf4+ 7. Tgxf4+ Sh5xf4+ 8. Thxf4+ Kxf4+ 9. Dhe5+ Tgxe5+ 10. D1xe5+ Texe5+ 11. D8xe5+ Dcxe5+ 12. Daxe5#
play all play one stop play next play all
https://timkr.home.xs4all.nl/chess2/diary_14.htm

Automatische Zugfolge (No-brainer) mit Zugumstellungen
Henrik Juel: sKf5 is in check from wTf3, so it is Black to move
With 11 white moves to reach mate, the stipulation should read #11, and the conventional numbering is 0... Sf4+ .. 11.Dxe5# (2020-04-19)
Henrik Juel: The missing men are wLLS and sPPP
8+5 promotions have happened, after the needed 3+2 pawn captures, e.g.
wPaxPb, wPcxPd, wPexPf, sPgxL, sPhxL
(The position would still be legal with one white light officer added to the diagram) (2020-04-19)
Henrik Juel: It may be that the 'conventional' numbering would ruin the PDB animation... (2020-04-19)
James Malcom: See the earlier 19 ply P1181666. (2021-02-06)
VL: My version of this problem, stipulated ###1, with wRf3 shifted to e3 was published in my article “Completely unavoidable mate” (The Problemist, v.24, No.6, November 2013; Pr.No.7), where ### denotes a CU-mate introduced in the article. (2021-02-09)
more ...
comment
Keywords: Non-standard material, No-brainer, Consecutive checks (22), Aristocrat, Construction task, Construction record, Move Length Record
Genre: n#
FEN: 4Q2Q/4r3/4n1n1/1bbK1krn/RR1RR1RR/2qn1R1n/4n1nN/Q3Q3
Input: HBae, 2010-12-04
Last update: James Malcom, 2021-02-07 more...
2 - P1298074
Jacques Rotenberg
Problemiste 2012
1st prize
P1298074
(10+16)
#11
1. Sfxe7+! exd5+ 2. Sxd5+ Sef6+,Shf6+ 3. Sdxf6+ d5+ 4. Sxd5+ Sf6+ 5. Sdxf6+ d5+ 6. Sxd5+ Te7+ 7. Sdxe7+ Ld5+ 8. Sxd5+ Te7+ 9. Sdxe7+ f5+ 10. Sxf5+ De7+ 11. Sfxe7#
play all play one stop play next play all
correction of P1298046
Henrik Juel: 21 consecutive checks; unfortunately, the position is illegal.
White never captured, while black pawns captured six times by axbxcxd, b7xc6, c7xd6, and h7xg6; but [Pf2] could not have been captured.
Nowadays it is rare to see an illegal prize winner, so the diagram may be incorrect (Pg2?) (2015-02-25)
Henrik Juel: Now I see that Jacques, in his comment to P1298046, gave this position, so my last sentence does not apply (2015-02-25)
Henrik Juel: The illegality is even 'worse' than I first thought, because [Pe2] could not have been captured either (2015-02-27)
James Malcom: I think it would be nice to have a legal version of this record. To do this, I propose we shorten the solution until a legal position is reached.

A #9 with 33B2N1/qrrp1ppn/1Ppp1np1/2QN2k1/3PKR2/8/b2p2P1/8 seems legal, no? (2021-02-06)
Anton Baumann: störender Dual in der Lösung: ... 7.Sde7+ f5+ 8.Sxf5+ Te7+ 9.Dxe7+,Lxe7+,Sxe7+ ...
Die Stellung wird legal mit schwarzer Umwandlungsfigur: d2=sT! Aber es bleibt der Dual in der Lösung.
Mögliche legale Stellung, ohne Dual in der Lösung: a7=sT, b7=sD, -sBc6, wBb6 nach c6 (10+15) #10
Lösung: 1.Sfe7+ exd5+ ... 7.Sde7+ Ld5+ 8.Dxd5+ f5+ 9.Sxf5+ De7+ 10.Sxe7# (2021-02-11)
comment
Keywords: Illegal position, Consecutive checks (21), Checking key, Construction task, Construction record, Move Length Record
Genre: n#
FEN: 3Bn1N1/qrrpbppn/1Pppp1p1/2QR1Nk1/3PKR2/8/b2p2P1/8
Input: A.Buchanan, 2015-02-25
Last update: James Malcom, 2021-02-07 more...
3 - P1381269
Grigory Popov
SuperProblem (Website) 24/10/2020
P1381269
(9+10) C+
#13
1. a4+! Kc5 2. b4+ Kd5 3. c4+ Ke5 4. d4+ Kf5 5. e4+ Kg5 6. Tg4+ Kh5 7. Ta5+ b5 8. Txb5+ c5 9. Txc5+ d5 10. Txd5+ e5 11. Txe5+ f5 12. Txf5+ g5 13. Tfxg5#
play all play one stop play next play all
Record of 5+6 pawn double-steps

http://superproblem.ru/archive/probl/N/Popov-13-2020.gif
A.Buchanan: The final move "Txg5#" was now correctly marked as an error, because it was ambiguous. Thanks Gerd! (2020-11-14)
more ...
comment
Keywords: Construction task, Construction record, Checking key
Genre: n#
Computer test: Gustav 4.1d
FEN: 1N3n2/1pppppp1/R6r/1k6/7R/5K2/PPPPP1n1/8
Input: James Malcom, 2020-10-24
Last update: A.Buchanan, 2020-11-14 more...
4 - P1382410
James Malcom
SuperProblem (Website) 25/11/2020
nach Grigory Popov
P1382410
(11+7) C+
#8
1. a4+! Kc5 2. b4+ Kd5 3. c4+ Ke5 4. d4+ Kf5 5. e4+ Kg5 6. f4+ Kh6 7. g4 Txa6 8. g5#
7. ... Lg8 8. Txh5#
play all play one stop play next play all
7 pawn double-steps by White


http://superproblem.ru/archive/probl/N/Malcom-8x-2020.gif
SCHRECKE: C+, Gustav 4.1d, Brute Force (2020-11-25)
James Malcom: Houston, we have a problem: I merely marked this as C+, and the entire position just disappeared?! (2020-12-30)
Gerd Wilts: Hi James, this was unfortunately a new bug introduced yesterday evening with a PDB update. It is now fixed. (2020-12-31)
comment
Keywords: Construction record
Genre: n#
FEN: 1N6/r2p2pb/R5p1/1k5p/7R/7K/PPPPPPP1/8
Input: James Malcom, 2020-11-25
Last update: Gerd Wilts, 2020-12-31 more...
Show statistic for complete result. Show search result faster by using ids.

https://pdb.dieschwalbe.de/search.jsp?expression=COMMENTDATE%3E%3D20200919+AND+NOT+K%3D%27Hilfsr%C3%BCckz%C3%BCger%27+AND+K%3D%27Konstruktionsrekord%27+AND+G%3D%27n%23%27

The problems of this query have been registered by the following contributors:

HBae (1)
A.Buchanan (1)
James Malcom (2)