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1 problem(s) found in 1273 milliseconds (displaying 1 problem(s)). [COMMENTDATE>=20220810 AND G='Retro' AND K='Miniatur' AND S='La Strategie'] [download as LaTeX]

1 - P1185584
Mrs. W. J. Baird
La Strategie
P1185584
(3+3) cooked
-1w,-1s, dann h#1, keine Damen
R: 1. Sc5xTe6 h7xTg6, dann 1. Te6-d6 Tg6-g5#
play all play one stop play next play all
Cook: R: 1. Sc5-e6 (oder Sc5xTe6) Kc4xTd5, dann 1. Kc4-b5 Sc5-d3# (oder Sa6#)
Motto: "Our play"
Originalforderung 1.White played last, retract his move 2.Black retracts his last move 3.Black plays so as to enable-- 4.White to mate 5.No Queens
A.Buchanan: The issue is that wPb3 covers a4. Rotate the board clockwise by 90 deg & shift wPc7 to c5 gives unique queenless solution R: 1. Se6xTf4 g3xTf2, dann 1. Tf5 Te2#, together with 68 queeny tries. (2022-11-13)
Adrian Storisteanu: The wQ is, unfortunately, extremely deadly. In your suggested position, there are still cooks, e.g.,
- 1.Kg6xPg7 g3xQf2 & 1.g3-g2 Qf2-e3#
- 1.Sg2xRf4 e3xQf2 & 1.Rf4-e4 Qf2-f6# (2022-11-13)
A.Buchanan: Yes I make no attempt to remove the "keine Damen" constraint, which is a kind of thematic aid that Baird employs quite often. deadpos identifies 69 solutions in the rotated position 8/6K1/8/2Ppk3/5N2/8/5p2/8, of which 68 require a queen (2022-11-13)
Adrian Storisteanu: The "no queens" constraint seems here almost thematic, as the intended solution works just as fine with a wQ uncapture: - 1.Sc5xRe6 h7xQg6 & 1.Re6-d6 Qg6-g5#... (2022-11-13)
Adrian Storisteanu: (What is "deadpos"?) (2022-11-13)
Adrian Storisteanu: A quick fix along your intention is also -wPb3,+bPc4 (90 queeny tries). (2022-11-13)
A.Buchanan: deadpos is a software engine that determines very efficiently whether a position is dead or not, and allows stipulations such as h=, hdp, h#. Simple retractions are also important for DP last move problems, and since no-one who's written help retractor functionality has ever made it public, this is of use for testing neglected problems such as Mrs Baird's, which have little to do with DP rule. A broader name for this engine will probably emerge at some point.
Your fix -wPb3, + bPc4 also works! (2022-11-13)
comment
Keywords: Help retractor, Miniature, Constrained problem, Superseded by (P1414378)
Genre: Retro
Computer test: C- deadpos v1.0: 1 solution + 2x2 cooks
FEN: 8/1K6/4N1p1/3k4/3p4/1P6/8/8
Reprints: 66 Twentieth Century Retractor 1907
Input: Mario Richter, 2011-01-23
Last update: A.Buchanan, 2024-01-08 more...
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Mario Richter (1)