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2 problem(s) found in 5516 milliseconds (displaying 2 problem(s)). [COMMENTDATE>=20220810 AND G='Retro' AND K='Cross-capture' AND A='Lois, Jorge Joaquin'] [download as LaTeX]

1 - P1339612
Roberto Osorio
Jorge Joaquin Lois

R496 The Problemist 2015-2016
1. ehrende Erwähnung
The Problemist 2015-2016
P1339612
(11+14) C+
PG in 20.5
1. c4 d5 2. Db3 Lf5 3. Db6 axb6 4. Sh3 Ta3 5. Tg1 Tc3 6. a4 e6 7. a5 Ke7 8. a6 Kf6 9. a7 Le7 10. a8=D Df8 11. Da4 Txc1+ 12. Dd1 Tc3 13. Ta6 Tf3 14. gxf3 bxa6 15. Tg6+ hxg6 16. Sg1 Th3 17. Db3 Tg3 18. Lh3 Kg5 19. De3+ Kh4 20. Dh6+ gxh6 21. fxg3+
play all play one stop play next play all
Judge's comment [Silvio Baier]: "Two cross-captures with the same type of captured pieces (QR) are combined with a cross-capture of two black rooks. This is not the highest number of cross- captures in an orthodox proof game (see e.g. P1003984 for comparison), but the pairs are very harmonious and the additional white Q-Pronkin is difficult to implement, and especially the motivation of the promotion of Pa2 is very deep. The check in the diagram position does not detract, since g2-g3+ is also possible with respect to pure retroanalysis."
A.Buchanan: Great problem, but I disagree with the last sentence in Silvio's comment. The alternative at the end g2-g3+ would force an obtrusive bishop. If the composers could have figured out how to do this without the final check, they obviously would have. (2017-09-18)
Henrik Juel: I also like this proof game very much
It seems the kind of problem that is most readily solved by hand; the missing [Lc1] and the missing black rooks might prompt the suspicious solver to consider cross-captures
Euclide did find the solution, but after a long time, and he was not able to verify uniqueness within an hour (2017-09-18)
Moldenhauer: Computerprüfung: C+ Stelvio 1.4 00:01:28 Minute. (hh:mm:ss)
Wegen Retraktion, keine Überprüfung auf 20.0. (2023-07-17)
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comment
Keywords: Unique Proof Game, Cross-capture (DT,DT,tt), Ceriani-Frolkin Theme (D), Impostor (ppppPP)
Genre: Retro
Computer test: Stelvio 1.4
FEN: 1n3qn1/2p1bp2/pp2p1pp/3p1b2/2P4k/5PPB/1P1PP2P/1N2K1N1
Reprints: The Problemist , p. 5, 03/2017
Input: A.Buchanan, 2017-09-18
Last update: Silvio Baier, 2023-08-15 more...
2 - P1340215
Roberto Osorio
Jorge Joaquin Lois

R470 The Problemist vol.24-8, p. 341, 03/2014
after Satoshi Hashimoto
Lob
The Problemist 2013-2014
P1340215
(15+9)
PG in 18.5
1. d3 g5 2. Lxg5 Lg7 3. Dd2 Lc3 4. Sxc3 c5 5. 0-0-0 Dc7 6. Sb1 Dg3 7. hxg3 h6 8. Txh6 b6 9. Te6 Th3 10. gxh3 Lb7 11. Lg2 Lf3 12. Sxf3 Sf6 13. Th1 Se4 14. Dd1 Sd2 15. Kxd2 fxe6 16. Ke1 Kf7 17. Lc1 Kf6 18. Sg1 Ke5 19. Lf1
play all play one stop play next play all
Judge's comment [Thomas Brand]: "This elegant proof game seems me original enough compared with Hashimoto's Probleemblad 1999, 3rd Prize, (PDB P1000642), even though the theme is not doubly set. The only missing white man is a Rook captured at e6, but Ra1 could not leave home."
Henrik Juel: The white plan is obvious, and Black ensures uniqueness by putting his men to be captured on squares, where White can go anyway, and by a late king's walk
This proof game is an enjoyable solving object showing that man can beat the computer; Euclide was still trying to find a strategy (a list of moves, possibly infeasible, that leads to the diagram position), when I had solved the problem and written the present lines...
You might call Pg3,h3 impostors also, as well as Th1 (2017-09-27)
Moldenhauer: Computerprüfung: C+ Natch 3.3 in 5 Std. 57 Min. nur obige Lösung
BP in 17.5 keine Lösung. (2022-09-05)
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Keywords: Unique Proof Game, Impostor (TPP), Switchback (SLDKLS), Cross-capture (gh)
Genre: Retro
FEN: rn6/p2pp3/1p2p3/2p1k3/8/3P2PP/PPP1PP2/1NBQKBNR
Reprints: R470 The Problemist vol.25-8, p. 347, 03/2016
Input: A.Buchanan, 2017-09-27
Last update: Alfred Pfeiffer, 2019-06-03 more...
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A.Buchanan (2)