Last Move?

Originally posted by BigDoggProblem
Can you prove it?

Well, how else could the Black bishop have gotten to a1?

Originally posted by ilywrin
Well, how else could the Black bishop have gotten to a1?

Another piece could have captured on b2 (no reason it has to be a Bishop), or White could simply move the b-pawn. It could then be taken later by any black piece, or sacrificed on c4 instead of the a-pawn.

But then there wouldn't be enough pieces for the black g-pawn to get to b2 (and from there promote to a1 to a bishop), wasnt it that?

Originally posted by crazyblue
But then there wouldn't be enough pieces for the black g-pawn to get to b2 (and from there promote to a1 to a bishop), wasnt it that?

Ba1 isn't a promoted Bishop. The last move was ...b1Q#.

Originally posted by BigDoggProblem
Ba1 isn't a promoted Bishop. The last move was ...b1Q#.

OMFG!11!!!!

I pmed that to you. So what if I had no proof?

Originally posted by Coconut
OMFG!11!!!!

I pmed that to you. So what if I had no proof?

lol, then I'd have to credit several people who got the right last move with wrong or incomplete reasoning. Unfortunately, the problem is a bit weak in forcing the solver to 'prove it'.

Since the White king is in check , Black's move was probably taking on g3 so it must be fxg3+ or hxg3+ , g3 is not possible becuase the pawn would occupy the king's square.

Since the White king is in check , Black's move was probably taking on g3 so it must be fxg3+ or hxg3+ , g3 is not possible becuase the pawn would occupy the king's square.

Originally posted by SicilianNajdorf
Since the White king is in check , Black's move was probably taking on g3 so it must be fxg3+ or hxg3+ , g3 is not possible becuase the pawn would occupy the king's square.

It is possible to prove where the black pawn came from and what type of piece it captured.