Posers and Puzzles
27 Mar 05
28 Mar 05
1 edit
Originally posted by THUDandBLUNDERWell, let's look at the last two moves of both sides shall we?
What's to stop d4 rook coming from a1?
If 1. Rad1? then black castles.
White's may have been any (they cannot castle either way since either the rook at d4 came from h1, so the king moved, or it came from a1 so the king again moved and the rook also).
Black's last move can only be
2...b6, the previous therefore must be a capture (or move) to either d4 or a1 for him to be able to castle.
EDITED: Capture at e6 or promotion at e1 also spotted.
I will think a bit more to find what prevents Black from castling but the solution is in any case 1.Rad1!
28 Mar 05
1 edit
Originally posted by JusuhQuite true 🙂 I have forgotten about that 🙄
ilywrin, have you heard about under-promotion. 🙂 pawns can be promoted not only queens, but to rooks, knights and bishops too.
Anyway the only possible places to promote a black bishop of the respective colour would be g1 and c1 and seeing the position as it is there must have been two captures, one with check, so white king must have moved so White cannot castle.
And also White must take care of the black bishop on the f8 (missing in the final position). The only possible way through underpromotion would be through Ng(e)6 x f8 which however I cannot find impossible.
28 Mar 05
Originally posted by ilywrinOK, I am getting too old for this. What is wrong with the following premises (as a possibibility):
See the bishop at b8 it must have gooten there through h6 so g6 was played before 🙂
- the last two moves were a7 by white and g6 by black
- black can castle, meaning that
--- the bishop on f8 was captured before by a white knight
--- the bishop on b8 is a promoted one, a pawn promoting on g1 (black's d-pawn, after capturing two other pieces/pawns). The bishop came to b8 via a7, before the white pawn was there.
- white cannot castle (because the king must have moved, either before or at the moment the black pawn came to f2)
That would mean no solution, since Rd1 would be followed by 0-0.
28 Mar 05
Originally posted by Mephisto2See my previous posts, I have totally agreed with that but THUDandBLUNDER insists that there's a solution.
OK, I am getting too old for this. What is wrong with the following premises (as a possibibility):
- the last two moves were a7 by white and g6 by black
- black can castle, meaning that
--- the bishop on f8 was captured before by a white knight
--- the bishop on b8 is a promoted one, a pawn promoting on g1 (black's d-pawn, after capturing two other pi ...[text shortened]... t the black pawn came to f2)
That would mean no solution, since Rd1 would be followed by 0-0.
My only reasoning in this case is that since the condition of the problem cannot be met if Black can castle he shouldn't be able to, in order to have a solution 🙂
28 Mar 05
1 edit
Originally posted by ilywrinHINT:
See my previous posts, I have totally agreed with that but THUDandBLUNDER insists that there's a solution.
My only reasoning in this case is that since the condition of the problem cannot be met if Black can castle he shouldn't be able to, in order to have a solution 🙂
Can you prove that White can't castle?
Can you prove that Black can't castle?
Can you prove that not both can castle?
28 Mar 05
3 edits
Very well, Jusuh is right then. To the 2 mover:
The rook at d4 was promoted so White plays 1.O-O-O! and Black has moved his rook or king (due to the promotion) so he can't castle.
The same to the 3 mover. Only this time black bishop is not promoted, so last move isn't g6 🙂
So, by castling White denies the Black the option of castling and the problem is resolved 🙂
Hehehe, this was educational 😉
28 Mar 05
Originally posted by THUDandBLUNDERisn't it sufficient that there is no proof that black lost his castling right? Apart from a flaw in my set of premises (which I hope you will show us if that is the case), then I think we cannot exclude black castling and hence, escape from mate in 3.
HINT:
Can you prove that White can't castle?
Can you prove that Black can't castle?
Can you prove that not both can castle?