Only Chess
27 Oct 10
27 Oct 10
5 edits
Originally posted by rogilvieThe white rook was promoted on f8. an uncapture of a knight is illegal because black still has all 8 pawns. The rook had to be promoted on f8 because after white uncaptures on e8 there is only one retraction for black -1...cxd6 and only one capture made by white and that would be needed to get two pawns on the f file.
I'm not even sure how the white rook got to a8, but here goes:
Take back f7xQe8=Q and replace with f7xNg8=N++
27 Oct 10
9 edits
Originally posted by SwissGambitSo uncapture a rook.
Almost solved - just need the last 3 single moves.
i don't know what to uncapture on c6 though
how about a pawn because anything else and black won't have a retraction.
and then the last single move before that whould be c5c6
27 Oct 10
Originally posted by tomtom232It can't be a rook uncaptured on d8, since there's no way out for a rook from a8. So must been a queen uncaptured there since the only other captured black piece is a dark squared bishop. So we have
So uncapture a rook.
[fen]R1brrnnB/pp1pkP1p/3pp1p1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
i don't know what to uncapture on c6 though
[fen]R1brrnnB/ppppkP1p/31p1p1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
how about a pawn because anything else and black won't have a retraction.
[fen]R1brrnnB/ppppkP1p/3Pp1p1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
and then the last sin ...[text shortened]... ve before that whould be c5c6
[fen]R1brrnnB/ppppkP1p/31p1p1/3P2N1/6Kp/8/8/8 w - - 0 1[/fen]
Last black move can't have been the pawn capture, as then there's no way for whites rook to get where it is, so black's last move must have been Kf6-e7, making white's prior move Pg7xBh8=B+
I think this works
27 Oct 10
Originally posted by PiisgoodYeah thats right. I knew there was a problem with mine just didn't know what.
It can't be a rook uncaptured on d8, since there's no way out for a rook from a8. So must been a queen uncaptured there since the only other captured black piece is a dark squared bishop. So we have
[fen]R1brqnnB/pp1pkP1p/3pp1p1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
Last black move can't have been the pawn capture, as then there's no way for whites rook to ge ...[text shortened]... h8=B+
[fen]R1brqnnb/pp1p1PPp/3ppkp1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
I think this works
27 Oct 10
Originally posted by PiisgoodRight.
It can't be a rook uncaptured on d8, since there's no way out for a rook from a8. So must been a queen uncaptured there since the only other captured black piece is a dark squared bishop. So we have
[fen]R1brqnnB/pp1pkP1p/3pp1p1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
Last black move can't have been the pawn capture, as then there's no way for whites rook to ge ...[text shortened]... h8=B+
[fen]R1brqnnb/pp1p1PPp/3ppkp1/6N1/6Kp/8/8/8 w - - 0 1[/fen]
I think this works
Note that white promotes to all four different types of pieces [allumwandlung], and each pawn captures a piece and promotes to that same piece type [fxQe8=Q, gxBh8=B, fxNg8=N]. c7xRb8=R is how that pawn promoted, because Ra8 is the only piece left after you retract the 3 moves.