13 problem(s) found in 2410 milliseconds (displaying 13 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND A='Buchanan, Andrew' AND K='Typ C'] [download as LaTeX]
1 - P1227253
Andrew Buchanan
N1QCi) Economy Records in Add Unit(s) Problems , p. 4, 06/06/2011
(5+5)
Add one unit.
Andrew Buchanan
N1QCi) Economy Records in Add Unit(s) Problems , p. 4, 06/06/2011
(5+5)
Add one unit.
+wDa2
R: Tb2-b1++
Impossible treble check, so blocking unit needed on b2 or a2. If the former, then Bl just played R: 1. axb1=T++ & Wh only has a prior move if b2 unit is wS, but then illegal check to sK. So the unit must be added on a2. Last move was not b2-b1=R++ because of prior illegal check from sBb2. So it must be Tb2-b1++ (a capture implies retro pat). So what's on a2? Prior White move was not Kb1-a1, or the check from Tb2 is impossible. So it was L/D allowing L/Db1*a2. If the former, then there is a core cage comprising wKa1 wLb1 wBb3c2d2 sTb2 which can never unlock. So can only be +wDa2, with no problem for wD eventually sliding out.
R: Tb2-b1++
Impossible treble check, so blocking unit needed on b2 or a2. If the former, then Bl just played R: 1. axb1=T++ & Wh only has a prior move if b2 unit is wS, but then illegal check to sK. So the unit must be added on a2. Last move was not b2-b1=R++ because of prior illegal check from sBb2. So it must be Tb2-b1++ (a capture implies retro pat). So what's on a2? Prior White move was not Kb1-a1, or the check from Tb2 is impossible. So it was L/D allowing L/Db1*a2. If the former, then there is a core cage comprising wKa1 wLb1 wBb3c2d2 sTb2 which can never unlock. So can only be +wDa2, with no problem for wD eventually sliding out.
Keywords: Type C, Add pieces, Economy record
Genre: Retro
FEN: 8/8/8/8/1P6/rPb5/2PP4/Krnk4
Input: Alain Brobecker, 2011-12-16
Last update: A.Buchanan, 2023-04-13 more...
Genre: Retro
FEN: 8/8/8/8/1P6/rPb5/2PP4/Krnk4
Input: Alain Brobecker, 2011-12-16
Last update: A.Buchanan, 2023-04-13 more...
2 - P1227257
Andrew Buchanan
N18Ci) Economy Records in Add Unit(s) Problems , p. 6, 23/07/2011
(9+5)
Add 18 units.
Andrew Buchanan
N18Ci) Economy Records in Add Unit(s) Problems , p. 6, 23/07/2011
(9+5)
Add 18 units.
+wBa4b2d2f2h4 +wLc1 +wDc3 +sBa5b6c7d7e7f3g7h5 +sLf8 +sTc4 +sDg3
R: S-d4
All pieces will be on board so pawns remain on their original files.
+BPc7d7e7g7 & +WPd2, implying +BBf8. Since BBd5 is out we've +BPb6 +WPb2, entailing +WBc1.
WKb3 is attacked by WNd4, so we need 4 units on the lines to the Ks and one of those lines is blocked by P, so +BPf3 +WPf2. Since all Rs must be out, we have +WPa4h4 +BPa5h5. Lastly, the remaining line interceptions are +BRc4 +WQc3 +BQg3.
R: S-d4
All pieces will be on board so pawns remain on their original files.
+BPc7d7e7g7 & +WPd2, implying +BBf8. Since BBd5 is out we've +BPb6 +WPb2, entailing +WBc1.
WKb3 is attacked by WNd4, so we need 4 units on the lines to the Ks and one of those lines is blocked by P, so +BPf3 +WPf2. Since all Rs must be out, we have +WPa4h4 +BPa5h5. Lastly, the remaining line interceptions are +BRc4 +WQc3 +BQg3.
Record of the highest number of units to add so that a position becomes legal (Type C, number of units specified).
See http://abrobecker.free.fr/chess/addunits.pdf (2011-12-16)
Henrik Juel: Good problem with well-explained solution (2021-01-17)
A.Buchanan: Thanks Henrik :) (2021-01-18)
comment
See http://abrobecker.free.fr/chess/addunits.pdf (2011-12-16)
Henrik Juel: Good problem with well-explained solution (2021-01-17)
A.Buchanan: Thanks Henrik :) (2021-01-18)
comment
Keywords: Type C, Add pieces, Economy record
Genre: Retro
FEN: 8/8/2PNP1P1/1N1b4/1R1n2k1/1K1r4/6Rn/3B4
Input: Alain Brobecker, 2011-12-16
Last update: A.Buchanan, 2023-04-13 more...
Genre: Retro
FEN: 8/8/2PNP1P1/1N1b4/1R1n2k1/1K1r4/6Rn/3B4
Input: Alain Brobecker, 2011-12-16
Last update: A.Buchanan, 2023-04-13 more...
3 - P1380852
James Malcom
Andrew Buchanan
MatPlus.net Forum 12/10/2020
after Josef Cumpe
(1+7)
Last two moves?
(-:
James Malcom
Andrew Buchanan
MatPlus.net Forum 12/10/2020
after Josef Cumpe
(1+7)
Last two moves?
(-:
R: 1. 0-0-0+ a7-a8=sT
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)
comment
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)
comment
4 - P1380882
James Malcom
Andrew Buchanan
PDB Website 14/10/2020
after Josef Cumpe
(2+7)
Last two moves?
(-:
James Malcom
Andrew Buchanan
PDB Website 14/10/2020
after Josef Cumpe
(2+7)
Last two moves?
(-:
R: 1. ... 0-0-0+ 2. a7-a8=sT
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)
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comment
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)
more ...
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Keywords: Last Moves? (2), Type C, Castling in the retro play, Non-standard material (tt), Joke, Joke promotion (t), Promotion in the retro play (t), Minimal, Castling (sg)
Genre: Retro
FEN: 2kr3K/1r1r1qrR/7p/8/8/8/8/8
Input: A.Buchanan, 2020-10-14
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: 2kr3K/1r1r1qrR/7p/8/8/8/8/8
Input: A.Buchanan, 2020-10-14
Last update: A.Buchanan, 2023-08-15 more...
5 - P1382909
Andrey Frolkin
Andrew Buchanan
7 Die Schwalbe 360-1, p. 740, 12/2020
after Schwarzkopf, Dittmann & Murkisch
(10+1)
Erster Zug des wTg1?
Andrey Frolkin
Andrew Buchanan
7 Die Schwalbe 360-1, p. 740, 12/2020
after Schwarzkopf, Dittmann & Murkisch
(10+1)
Erster Zug des wTg1?
See P0007812.
Typo in published version, stip given incorrectly as "Last move?"
Henrik Juel: Last move was e2xDTLSPd3+
The top four pawns seem unnecessary (2020-12-12)
Henrik Juel: Sorry, the pawns are necessary to rule out Th1xg1 as first move (2020-12-12)
comment
Typo in published version, stip given incorrectly as "Last move?"
Henrik Juel: Last move was e2xDTLSPd3+
The top four pawns seem unnecessary (2020-12-12)
Henrik Juel: Sorry, the pawns are necessary to rule out Th1xg1 as first move (2020-12-12)
comment
Keywords: Economy record (First move), Type C, First Move? (T-)
Genre: Retro
FEN: 8/8/5PPP/8/2k4P/3P4/2K3PP/5BR1
Reprints: 7 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2021-05-08 more...
Genre: Retro
FEN: 8/8/5PPP/8/2k4P/3P4/2K3PP/5BR1
Reprints: 7 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2021-05-08 more...
6 - P1382910
Andrey Frolkin
Andrew Buchanan
8 Die Schwalbe 360-1, p. 740, 12/2020
(16+6)
Erster Zug des wTf3?
Andrey Frolkin
Andrew Buchanan
8 Die Schwalbe 360-1, p. 740, 12/2020
(16+6)
Erster Zug des wTf3?
R: 1. Tf1xBf3+! f4-f3 2. f3xBe4+ e5-e4 3. 0-0! Kg2-g3
Henrik Juel: White captured TxPf3+, axbxcxd, bxcxd, cxd, fxPe, g5xh6, and h6xg7-g8=L
R: 1.Tf1xPf3+ f4-f3 2,f3xPe4+ e5-e4 3.0-0 Kg2-g3 (2020-12-12)
comment
R: 1.Tf1xPf3+ f4-f3 2,f3xPe4+ e5-e4 3.0-0 Kg2-g3 (2020-12-12)
comment
Keywords: Economy record (First move), Type C, First Move? (TxB), Castling in the retro play (wk), Non-standard material (DTLL), Castling (wk)
Genre: Retro
FEN: 3N4/ppp4P/4NBpB/5BQp/4P1BR/R3QRk1/3PP3/6K1
Reprints: 8 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: 3N4/ppp4P/4NBpB/5BQp/4P1BR/R3QRk1/3PP3/6K1
Reprints: 8 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
7 - P1382911
Andrey Frolkin
Andrew Buchanan
9 Die Schwalbe 360-1, p. 740, 12/2020
(12+6)
Erster Zug des wTd1?
Andrey Frolkin
Andrew Buchanan
9 Die Schwalbe 360-1, p. 740, 12/2020
(12+6)
Erster Zug des wTd1?
R: 1. Tf1xSd1+! Sc3-d1 2. 0-0+!
Henrik Juel: Black has played c3/a3xLb2-b1=T, earlier Kb4-a3-b2-b1, and still earlier Sb3xTa1
R: 1.Tf1xSd1+ Sc3-d1 2.0-0+ (2020-12-12)
Henrik Juel: A very impressive set of retros
Thanks for making them available, Andrew (2020-12-12)
A.Buchanan: Very welcome Henrik: thanks for your invaluable solving! (2020-12-13)
comment
R: 1.Tf1xSd1+ Sc3-d1 2.0-0+ (2020-12-12)
Henrik Juel: A very impressive set of retros
Thanks for making them available, Andrew (2020-12-12)
A.Buchanan: Very welcome Henrik: thanks for your invaluable solving! (2020-12-13)
comment
Keywords: Economy record (First move), Type C, First Move? (TxS), Castling in the retro play (wk), Castling (wk)
Genre: Retro
FEN: N7/p1p5/8/8/8/PP6/qrPPPPPP/nNkR2K1
Reprints: 9 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: N7/p1p5/8/8/8/PP6/qrPPPPPP/nNkR2K1
Reprints: 9 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
8 - P1382912
Andrey Frolkin
Andrew Buchanan
10 Die Schwalbe 360-1, p. 741, 12/2020
(10+8)
Erster Zug des wTf8?
Andrey Frolkin
Andrew Buchanan
10 Die Schwalbe 360-1, p. 741, 12/2020
(10+8)
Erster Zug des wTf8?
R: 1. Tf1xLf8+ & e.g. f4xSg3,f4x~g3 2. 0-0 e5xLf4,e5x~f4 3. Lf1-g2 d6xDe5,d6x~e5 4. g2xSh3,g2x~h3
and later White unpromotes via a7,c7&f7
and later White unpromotes via a7,c7&f7
Keywords: Economy record (First move), Type C, First Move? (TxL), Castling in the retro play (wk), Castling (wk)
Genre: Retro
FEN: R4R1k/1p1pp1pP/6pp/3N4/8/6pP/4P1BP/3B2K1
Reprints: 10 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: R4R1k/1p1pp1pP/6pp/3N4/8/6pP/4P1BP/3B2K1
Reprints: 10 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
9 - P1382913
Andrey Frolkin
Andrew Buchanan
11 Die Schwalbe 360-1, p. 741, 12/2020
(13+8)
First move of [wTh1]?
Andrey Frolkin
Andrew Buchanan
11 Die Schwalbe 360-1, p. 741, 12/2020
(13+8)
First move of [wTh1]?
R: 1. ... g3xTf2+! 2. Tf1xTf2+! Tf3xTf2 (not 2.Tf1xSf2+?Sh1xTf2? because the second wT delivers illegal check) 3. 0-0! Dh2-h3 and e.g. 4. Tf1-f2 Lg1-e3 5. Sf2-d1 Ke5-f4 6. e3xBd4+
Henrik Juel: R: 1... g3xTf2 2.Tf1xTf2 Tf3xTf2 3.0-0 Dh2-h3 and e.g.
4.Tf1-f2 Lg1-e3 5.Sf2-d1 Ke5-f4 6.e3xPd4+
The remaining capture by Black was f5xLg4
[Pa7] was captured by a white officer (2020-12-13)
comment
4.Tf1-f2 Lg1-e3 5.Sf2-d1 Ke5-f4 6.e3xPd4+
The remaining capture by Black was f5xLg4
[Pa7] was captured by a white officer (2020-12-13)
comment
Keywords: Economy record (First move), Type C, First Move? (TxT), Castling in the retro play (wk), Castling (wk)
Genre: Retro
FEN: 8/1p5p/8/5PP1/3PNkpB/2PPb2q/P1pPPpQ1/3N2K1
Reprints: 11 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: 8/1p5p/8/5PP1/3PNkpB/2PPb2q/P1pPPpQ1/3N2K1
Reprints: 11 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
10 - P1382914
Andrey Frolkin
Andrew Buchanan
12c Die Schwalbe 360-1, p. 741, 12/2020
(16+8)
Erster Zug des wTf2?
Andrey Frolkin
Andrew Buchanan
12c Die Schwalbe 360-1, p. 741, 12/2020
(16+8)
Erster Zug des wTf2?
R: 1. Tf1xDf2+ Dg3-f2+ 2. Lf2xBb6 b7-b6 3. 0-0! Dh2-g3
Minor correction: sBd7->c6 wSb2->wL
Henrik Juel: Not R: 1.Tf1xDf2+ Dg3-f2+ 2.Lf2xPb6 b7-b6 3.0-0 Dh2-g3,
because White can no longer uncapture hxgxh
What was the intention? (2020-12-13)
A.Buchanan: Attempted repair to avoid accidentally retro-blocking c8 (2020-12-23)
Hans-Jürgen Manthey: mögliches Retrospiel: 1. Tf1xDf2# Dg3-f2 2. Lf2xb6+ b7-b6 3. O-O Dh2-g3 4. Se3-g2 Dg2-h2 5. Sc4-e3 Dh2-g2 6. Tg1-g4 Dg2-h2 7. Sa3-c4 Dh2-g2 8. g4-g5 Dg2-h2 9. Lb6-f2 Dh2-g2 10. Ld8-b6 Ke3-f3 11. d7-d8L Kd4-e3 12. Sc3-e2+ Kc5-d4 13. Le2-d1 Kd6-c5 14. Lf1-e2 Tf2-d2 15. Tg2-g1 Tf3-f2 16. Td2-g2 Se2-c1 17. Td1-d2 Te3-f3 18. Tb1-d1 Te6-e3 19. Lc1-b2 Th6-e6 20. f2-f4 Th8-h6 21. g2-g4 Sf4-e2 22. Se2-f3 Sd5-f4 23. Sg1-e2 Ke6-d6 24. Df4-h4 Ta8-h8 25. Da4xBf4 f5-f4 26. Da5-a4 Db8-h2 27. g4xTh5 h4-h3 28. b2-b3 Sb3-a1 29. Dd8xBa5 Sc5-b3 30. Df8-d8 a7-a5 31. Dh8xLf8 f7-f5 32. d6-d7 Kd7-e6 33. e5xBd6 Sf6-d5 34. Dh7-h8 Ke8-d7 35. De4-h7 Sg8-f6 36. Ta1-b1 Dd8-b8 37. Sb1-a3 Th8-h5 38. h3xLg4 h5-h4 39. h2-h3 Lc8-g4 40. De2-e4 h7-h5 41. e4-e5 c7-c6 42. d2-d3 Sa6-c5 43. Dd1-e2 d7-d6 46. e3-e4 Sb8-a6 47. e2-e3 (2020-12-25)
more ...
comment
Henrik Juel: Not R: 1.Tf1xDf2+ Dg3-f2+ 2.Lf2xPb6 b7-b6 3.0-0 Dh2-g3,
because White can no longer uncapture hxgxh
What was the intention? (2020-12-13)
A.Buchanan: Attempted repair to avoid accidentally retro-blocking c8 (2020-12-23)
Hans-Jürgen Manthey: mögliches Retrospiel: 1. Tf1xDf2# Dg3-f2 2. Lf2xb6+ b7-b6 3. O-O Dh2-g3 4. Se3-g2 Dg2-h2 5. Sc4-e3 Dh2-g2 6. Tg1-g4 Dg2-h2 7. Sa3-c4 Dh2-g2 8. g4-g5 Dg2-h2 9. Lb6-f2 Dh2-g2 10. Ld8-b6 Ke3-f3 11. d7-d8L Kd4-e3 12. Sc3-e2+ Kc5-d4 13. Le2-d1 Kd6-c5 14. Lf1-e2 Tf2-d2 15. Tg2-g1 Tf3-f2 16. Td2-g2 Se2-c1 17. Td1-d2 Te3-f3 18. Tb1-d1 Te6-e3 19. Lc1-b2 Th6-e6 20. f2-f4 Th8-h6 21. g2-g4 Sf4-e2 22. Se2-f3 Sd5-f4 23. Sg1-e2 Ke6-d6 24. Df4-h4 Ta8-h8 25. Da4xBf4 f5-f4 26. Da5-a4 Db8-h2 27. g4xTh5 h4-h3 28. b2-b3 Sb3-a1 29. Dd8xBa5 Sc5-b3 30. Df8-d8 a7-a5 31. Dh8xLf8 f7-f5 32. d6-d7 Kd7-e6 33. e5xBd6 Sf6-d5 34. Dh7-h8 Ke8-d7 35. De4-h7 Sg8-f6 36. Ta1-b1 Dd8-b8 37. Sb1-a3 Th8-h5 38. h3xLg4 h5-h4 39. h2-h3 Lc8-g4 40. De2-e4 h7-h5 41. e4-e5 c7-c6 42. d2-d3 Sa6-c5 43. Dd1-e2 d7-d6 46. e3-e4 Sb8-a6 47. e2-e3 (2020-12-25)
more ...
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Keywords: Economy record (First move), Type C, First Move? (TxD), Castling in the retro play (wk), Non-standard material (S), Castling (wk)
Genre: Retro
FEN: 8/4p1p1/1Bp5/6PP/5PRQ/1P1P1k1p/PBPrNRN1/n1nB2K1
Reprints: 12 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: 8/4p1p1/1Bp5/6PP/5PRQ/1P1P1k1p/PBPrNRN1/n1nB2K1
Reprints: 12 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
11 - P1382915
Andrey Frolkin
Andrew Buchanan
13 Die Schwalbe 360-1, p. 741, 12/2020
(15+10)
Erster Zug des wTf3?
Andrey Frolkin
Andrew Buchanan
13 Die Schwalbe 360-1, p. 741, 12/2020
(15+10)
Erster Zug des wTf3?
R: 1. Tf1xDf3+! Sf2-h1 2. 0-0! Se4-f2 and e.g. 3. Sf2-h3 Lh3-g4 4. Lg4-h5 Th5-g5 5. g5-g6 Th6-h5 6. Lh5-g4
Keywords: First Move? (TxD), Type C, Castling in the retro play (wk), Non-standard material (t), Castling (wk)
Genre: Retro
FEN: 8/4p2p/6P1/5PrB/5pbb/1PPPkRRN/1PPr2Pr/2BQ2Kn
Reprints: 13 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
Genre: Retro
FEN: 8/4p2p/6P1/5PrB/5pbb/1PPPkRRN/1PPr2Pr/2BQ2Kn
Reprints: 13 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...
12 - P1388688
Andrew Buchanan
Retros mailing list 16/04/2021
(16+15) C+
(a) Last move?
(b) KBP in 3.5
Andrew Buchanan
Retros mailing list 16/04/2021
(16+15) C+
(a) Last move?
(b) KBP in 3.5
b) 1. c3 f5 2. Db3 Sf6 3. Dg8 f4 4. Dxf8+
a) R: 1. ... Dg8xLf8+
a) R: 1. ... Dg8xLf8+
Henrik Juel: Part a)
Last move was Dg8xLf8+
Part b) C+ Euclide 1.01
1.c3 f5 2.Db3 Sf6 3.Dg8 f4 4.Dxf8+
Little solver challenge (2021-04-17)
comment
Last move was Dg8xLf8+
Part b) C+ Euclide 1.01
1.c3 f5 2.Db3 Sf6 3.Dg8 f4 4.Dxf8+
Little solver challenge (2021-04-17)
comment
Keywords: Unique Proof Game, Last Move?, Type C
Genre: Retro
Computer test: a) Retractor 2.0 b) C+ Euclide 1.01
FEN: rnbqkQ1r/ppppp1pp/5n2/8/5p2/2P5/PP1PPPPP/RNB1KBNR
Input: A.Buchanan, 2021-04-17
Last update: A.Buchanan, 2021-04-17 more...
Genre: Retro
Computer test: a) Retractor 2.0 b) C+ Euclide 1.01
FEN: rnbqkQ1r/ppppp1pp/5n2/8/5p2/2P5/PP1PPPPP/RNB1KBNR
Input: A.Buchanan, 2021-04-17
Last update: A.Buchanan, 2021-04-17 more...
13 - P1414063
Andrew Buchanan
The Puzzling Side of Chess 228 31/10/2023
(14+2)
Dead position, with check, maximizing the number of legal but unplayable moves.
Andrew Buchanan
The Puzzling Side of Chess 228 31/10/2023
(14+2)
Dead position, with check, maximizing the number of legal but unplayable moves.
20 legal but unplayable moves.
Black just played c6xd5+ or exd5+, not d6-d5? which would have ended the game in prior dead position.
Henrik Juel: The position is displayed by clicking on one of the five animation symbols and then moving the cursor (2023-12-14)
Henrik Juel: ... and then moving the cursor up (2023-12-14)
A.Buchanan: I think the phrase "legal but unplayable" is happier than "impossible", so I will use the former (2023-12-14)
A.Buchanan: Have reverted to the mode in which PDB shows the diagram directly, rather than having to click animation. (2023-12-16)
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Henrik Juel: ... and then moving the cursor up (2023-12-14)
A.Buchanan: I think the phrase "legal but unplayable" is happier than "impossible", so I will use the former (2023-12-14)
A.Buchanan: Have reverted to the mode in which PDB shows the diagram directly, rather than having to click animation. (2023-12-16)
more ...
comment
Keywords: Construction record, Minimal, Dead Position, Type C, Non-standard material (TTLSSSS)
Genre: Retro, Mathematics
FEN: B5Bk/2NRN3/1N3N2/R2p2R1/2KR1N2/4N3/6Q1/8
Input: A.Buchanan, 2023-12-14
Last update: A.Buchanan, 2023-12-16 more...
Genre: Retro, Mathematics
FEN: B5Bk/2NRN3/1N3N2/R2p2R1/2KR1N2/4N3/6Q1/8
Input: A.Buchanan, 2023-12-14
Last update: A.Buchanan, 2023-12-16 more...
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https://pdb.dieschwalbe.de/search.jsp?expression=COMMENTDATE%3E%3D20200919+AND+NOT+K%3D%27Hilfsr%C3%BCckz%C3%BCger%27+AND+A%3D%27Buchanan%2C+Andrew%27+AND+K%3D%27Typ+C%27
The problems of this query have been registered by the following contributors:
Alain Brobecker (2)A.Buchanan (11)
See http://abrobecker.free.fr/chess/addunits.pdf (2011-12-16)
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