173. Thema-Turnier
Henrik Juel: Good motivation for the black castling
The further retroplay includes retracting Tf1-g1, Kd3 to g1, h2xTg3, Tg3 to f8, La6 to c8, d7xTSe6, and e6xPf7 (2021-04-19)
A.Buchanan: Suppose I flip the board left-right? And remove sBh2? Does it all still work except with Qside castling? (2021-04-20, hidden) more ...
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Henrik Juel: The forward play is C+ Popeye 4.61
1.e8=D thr. 2.Dc8 thr. 3.Dc3#
1... f5 2.exf6ep e5 3.Dxe5#
(1... f6 does not prevent the threat, so 2.exf6 is not considered dualistic) (2020-09-26)
SBD: I would imagine that 1. 0-0+ b1=L were the last two moves. White mates here with 1. e8=D f5 2. exf e5 3. Dxe5#. (2012-12-12, hidden)
Henrik Juel: I can confirm that the retroplay is
-0... b2-b1=L -1.0-0
The problem shows the three strange moves, promotion, castling, and (if Black helps) e.p. capture (2012-12-12, hidden)
James Malcom: C+? (2020-09-26, hidden) more ...
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Rosalie Fay: R: 1. 0-0 b2-b1=B 2. d2-d3 c3xb2. What did the bP capture? A wQ or wR doesn't leave White a previous move; a wP makes an illegal wP structure, so wB or wN.

bK got into the SW cage via a3. When bK was on a3, [wPb2] was on b3, and [wPa2] was on a2. So these wPs did not cross-capture. wQ cannot have been in the cage at the time, because, if it were, bK could not get in without walking into check from wQ. So when wQ entered the cage, bK was already in. wQ must have entered via a1 or b2. To avoid giving an unparriable check, wQ must've moved to a1 with bKc1 and a shield on b1.

But this shield doesn't have to be the piece captured on b2 by the promoting bP. Why not

R: 1. 0-0 b2-b1=B 2. d2-d3 c3xBb2 3. Ba1xNb2+ b4xNc3 4. Nb1-c3 Nc4-b2 5. Bg7-a1 b5-b4 6, Qa1-a2 b6-b5 7, Qf6-a1 Ne5-c4 8, a2-a3 Kb2-c1 9. Nc3-b1 Ka3-b2 etc. (2021-02-06)
Henrik Juel: I agree with Rosalie
R: 2... c3xLb2 is also possible
Only the last 3 single moves are determined (2021-02-06)
Hans-Jürgen Manthey: ab dem 4.Einzelzug kann abweichend auch R: 1. 0-0 b2-b1=B 2. d2-d3 c3xNb2 3. Na4-b2 c4-c3 4. Nc3-a4 c5-c4 5. Nb1-c3 c6-c5 6. Qa1-a2 c7-c6 7. Qh8-a1 Kb2-c1 8. Qa8-h8+ Ka1-b2 9. Nc3-b1 Kb2xTa1 10. a2-a3 Ka3-b2 11. Na4-c3+ usw. geschehen (2021-02-06)
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Henrik Juel: Commendation
(awarded by Hans Gruber, PB no.1 2005 p.4) (2019-03-07)
Joost de Heer: @Hans: First retraction move isn't a pawn move. (2024-02-01)
hans: R: 1. --- 0-0-0+ 2. Kg7-h8 f7-f6 3. Kf6-g7 e4-e3 4. Kf5-f6 e5-e4 5. Ke4-f5 e6-e5 6. Kd3-e4 e7-e6 7. Te6-e2 e2-e1=L 8. Db2-a1 e3-e2 9. Ke2-d3 e4-e3 10. Dc1-b2 e5-e4 11. Dd1-c1 d6xLe5 12. Lb2-e5 c6-c5 13. Lc1-b2 c7-c6 14. b2-b4 b3xTa2 15. Ta1-a2 b4-b3 16. La2-b1 b5-b4 17. Lb3-a2 b6-b5 18. La4-b3 b7-b6 19. Lb5xa4 a5-a4 20. Ke1-e2 a6-a5 21. Lf1-b5 a7-a6 22. e2xSf3 etc. (all black pawn-moves) (2011-03-16, hidden) more ...
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See P1234039 and P1375777
The joke here is that pawns may promote to enemy officers (but not to pawns or kings)
Henrik Juel: R: 1... 0-0-0+ 2.a7-a8=sT! (2020-10-12)
A.Buchanan: Maybe this is a moderate joke where we allow promotion to Bl officers, while son-of-P1375777 can be the extreme joke where promotion to any Bl unit is allowed (i.e. pawn & king too), including in the history of the game. What would Josef Cumpe think? :-) He and I are both dressed as clerics in out chesscomposers' blogspot pics: http://chesscomposers.blogspot.com/2012/08/august-16th.html. Perhaps he was a real one though? (2020-10-13)
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See P1234039, P1375777 and P1380852.
The joke here is that pawns may promote to *any* unit (friend or enemy; officer, king or pawns).
Henrik Juel: R: 1... 0-0-0+ 2.a7-a8=sT
not 2.e7-e8=sK, because then sTa8 would have moved, and castling not allowed (2020-10-14)
A.Buchanan: Exactly, Henrik. Also: sB on 7th rank could retract to 8th rank, so we need sT instead (2020-10-14)
Henrik Juel: A non-joke solution is
R: 1... 0-0-0+ 2.h5-h6 (2020-10-14, hidden)
A.Buchanan: Sorry Henrik typo have fixed (2020-10-14, hidden) more ...
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