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  Play ... Latest Forum Posts > Chess Forums > Chess - General discussion
  'rooking' or 'bishoping' a pawn




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Taotaomonas

Chess rating: 1559





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Australia
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Wed Apr 6 2016 10:25PM | edited: 10:30:44 | MsgID: 18953803


[Quote from: "ockendon"]







Analyse position





[Quote from: "ockendon"].

Edit: no, you're right, after all! The white knight could already have been on b8, it could have been there for ages; and white's last move might have been (for example) Ke1!



White's last move is not necessarily relevant other than the pawn is (and more importantly was) where it is prior to blacks move. If it helps then this is why there are not 10 as there could never have been a bishop on the landing square.







ockendon

Chess rating: 1699
LCF 109 Fide approx. 1795






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England
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Wed Apr 6 2016 9:23PM | edited: 9:31:01 | MsgID: 18953659


[Quote from: "Taotaomonas"]
[Quote from: "ockendon"]







Analyse position





Ok, My definitive answer is as follows and is still 8.

Blacks last move had to be made by the knight. None of the others pieces could arrive at their current position aside from said knight now on b8.

The knight had to come from only two possible squares - c6 or d7.

Upon arriving on b8 it could have been met by the following -
1)Empty square
2)Rook
3)Knight
4)Queen

Therefore on the basis of only 4 possible combinations and 2 potential starting points. The choice of legal last moves for black is 8.


But, if the black knight has just captured a white knight on b8, the white knight must have just come from c6 or d7.

The same is true of the black knight that has just carried out the capture. So, if the white knight was on c6, the black knight must have been on d7; and vice versa.

But how could the white knight have just come from c6? It would have been checking the black king, and so black could not have made any move other than bxc6.

So the white knight (if there was one) must have come from d7; ergo, the black knight could only have come from c6.

Which leaves us with 7 possible moves.

Edit: no, you're right, after all! The white knight could already have been on b8, it could have been there for ages; and white's last move might have been (for example) Ke1!







Taotaomonas

Chess rating: 1559





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Australia
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Wed Apr 6 2016 4:38PM | edited: 4:39:25 | MsgID: 18953091


Originally posted by: "ockendon"








Analyse position





Ok, My definitive answer is as follows and is still 8.

Blacks last move had to be made by the knight. None of the others pieces could arrive at their current position aside from said knight now on b8.

The knight had to come from only two possible squares - c6 or d7.

Upon arriving on b8 it could have been met by the following -
1)Empty square
2)Rook
3)Knight
4)Queen

Therefore on the basis of only 4 possible combinations and 2 potential starting points. The choice of legal last moves for black is 8.










Taotaomonas

Chess rating: 1559





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Australia
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Wed Apr 6 2016 3:08PM | MsgID: 18952938


But if he had just captured it. He would be on that square so that is not possible unless black had 2 moves. I believe my last answer is finally correct. But you are right in that it takes more thought than you initially think.







ockendon

Chess rating: 1699
LCF 109 Fide approx. 1795






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England
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Wed Apr 6 2016 1:33PM | MsgID: 18952779


I mean the white knight that the black knight just captured!







Taotaomonas

Chess rating: 1559





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Australia
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Wed Apr 6 2016 12:48PM | MsgID: 18952709


Originally posted by: "ockendon"
I think it's only 7, because a white knight could not have moved to b8 from c6, as it would already have been checking the black king.




But it was a black knight







ockendon

Chess rating: 1699
LCF 109 Fide approx. 1795






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England
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Wed Apr 6 2016 9:53AM | edited: 11:41:12 | MsgID: 18952447


I think it's only 7, because a white knight could not have moved to b8 from c6, as it would already have been checking the black king.







Taotaomonas

Chess rating: 1559





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Australia
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Wed Apr 6 2016 8:42AM | MsgID: 18952367


Originally posted by: "Taotaomonas"
In the position you set Ockers. Blacks last move had to be one of only 7 legal moves as far as I can work out.

Can you name them?

Edit:- I stand corrected. It is actually only 2 puzzle over :))

Edit Edit - I now believe it is 10. It is my puzzle so I am allowed to fail it first two attempts :))




Back to 8







Taotaomonas

Chess rating: 1559





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Australia
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Tue Apr 5 2016 2:19PM | edited: 2:30:48 | MsgID: 18950719


In the position you set Ockers. Blacks last move had to be one of only 7 legal moves as far as I can work out.

Can you name them?

Edit:- I stand corrected. It is actually only 2 puzzle over :))

Edit Edit - I now believe it is 10. It is my puzzle so I am allowed to fail it first two attempts :))







ockendon

Chess rating: 1699
LCF 109 Fide approx. 1795






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England
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Tue Apr 5 2016 10:13AM | edited: 10:18:38 | MsgID: 18950412


That's because, as you'll know, it's easy to make a position where knighting is better than queening, e.g.








Analyse position










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