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1 problem(s) found in 7304 milliseconds (displaying 1 problem(s)). [PROBID='P1227635'] [download as LaTeX]

1 - P1227635
Michel Caillaud
6A) Economy Records in Add Unit(s) Problems , p. 7, 12/07/2011
P1227635
(10+12)
Add the missing unit(s)
b) +wTb1, +wTd2, +wLc2, +wSb3, +wSd3, +wPb4 R: 1. La1-c3 Kc3-c4 2. Tb2-b1
play all play one stop play next play all
4 W pieces on the diagram are promoted and are from WPf (without capture), WPc and WPg (1 capture each) and a fourth WP which made 2 captures: either the
WPb (passing round BPb) or the WPh (hxgxf).
The 4 missing B pieces were then captured. What was last move for B?
f7xe6 is impossible since it closes the f-file and implies 2 more captures by WPf and WPg. e7-e6 or e7xd6 is impossible since it removes BBf8 from B pieces captured by WPs and forbids the promoted WBs to g out of their promotion square.
The WK is retro-blocked and can not currently free the B pieces in the north cage. So the BK has played last, and the only possible square is c3!
To avoid the illegal checks we must add pieces on b3, b4, c2, d3 and d2.
To avoid checks on c3 or c4 we add WNs on b3 and d3 and a WR on d2.
WPb4 and WBc2 are the only remaining possibilities once the Ns are used.
Before n-1... Kc3-c4 n.B?-c3 the bishop was giving check and the only explanation is by adding WRb1 with n-1.Rb2-b1+ Kc3-c4 n.Ba1-c3.
Record of the highest number of units to add so that a position becomes legal (Type A, number of units not specified, promoted pieces).
See http://abrobecker.free.fr/chess/addunits.pdf (2011-12-22)
Alain Brobecker: See P1227636 for a version without promoted pieces. (2011-12-22)
Henrik Juel: White pawns captured all missing black men to make four white promotions possible. It turns out that we must add all six missing white men to enable a retroplay.
Add white Tb1,d2, Lc2, Sb3,d3, Pb4.
-1.La1 Kc3 -2.Tb2 Kc4 etc. (2011-12-22)
comment
Keywords: Type A, Add pieces, Non-standard material (DDLL), Economy record
Genre: Retro
FEN: nrb5/prp3pp/1pKpp3/B7/2kP4/Q1B1Q3/P3P3/2Q1B3
Input: Alain Brobecker, 2011-12-22
Last update: A.Buchanan, 2023-04-13 more...
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