Originally posted by AetheraelIs that your final answer?
i think there's only one... [b]1.Rd1..[insert any black move here] 2.Rd8#
the other variations fail: 1. Rxa4 .. e3! (2.Ra8+ .. Bxa8), 1. Rb1..Nb2! (or Nb6!), 1.Rc1..Nc3! (or Nc5!). and if Ra2, Ra3, or any other white move, black can just push his bishop to g2 or f3, or move a pawn, so long as he retains his knight at a4 he avoids mate in ...[text shortened]... though it's not explicitly stated that it's a white mate in 2, it does not present any issues[/b]
Originally posted by heinzkatmaybe i'm missing something but what stops the black bishop from surviving through the e-pawn capturing to f6, the h-pawn capturing to g6, and then bB moves to a3, c1, and h6 before blacks pawn continues to g5? then i count only 13 black pawn captures...
One [1. Rd1 ~ 2. Rd8#]. bBf8 was captured at home; bBh6 comes from a promoted pawn on a1 (from a7), so the a1 Rook must have moved; if the a7 pawn promoted on c1, that would have required 15 captures.
Originally posted by AetheraelThe Rook on g6 I think.
maybe i'm missing something but what stops the black bishop from surviving through the e-pawn capturing to f6, the h-pawn capturing to g6, and then bB moves to a3, c1, and h6 before blacks pawn continues to g5? then i count only 13 black pawn captures...
i'm still not good at these problems though so if you have some insight it would be much appreciated! i really like the logic behind the retro analysis games
Originally posted by heinzkatoh of course. very good thanks! and great problem swissgambit - i always love the subtleties of these constructions that seem obvious at first, have some sort of complicating/"oh i forgot to consider the possibility of ___"-twist, and yet are ultimately entirely concise and sound.
The Rook on g6 I think.
Originally posted by heinzkathaha... well it at least contradicted my proposed move order, in that black's a-file rook would not be able to sneak in there behind both black's DS bishop AND the h-pawn capturing at g7 followed by g7-g6. and i can't think of any other move configuration that would allow the pieces to be setup that way, so am more inclined to agree that the black bishop is a result of an a1 pawn promotion, since as you said a c1 promotion would require 15 pawn captures and thus make white's rook impossible.
Probably this is still incorrect but OK, I'm glad it sort of sounded convincing to you