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Wanted - Bishop promotion FEN

 
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Steven Atkinson



Joined: 13 Oct 2010
Posts: 450
Location: Australia
PostPosted: Wed Mar 07, 2012 9:44 am    Post subject: Wanted - Bishop promotion FEN Reply to topic Reply with quote
Does anyone have a positon where the best move is a pawn promoted to bishop ? - Preferably with a capture. (eg a7b8b)
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H.G.Muller



Joined: 10 Mar 2006
Posts: 12911
Location: Amsterdam
PostPosted: Wed Mar 07, 2012 10:08 am    Post subject: Re: Wanted - Bishop promotion FEN Reply to topic Reply with quote
[d]1q6/P6k/8/5N1K/8/8/8/8 w - - 0 1
   BQ    ::    ::    ::
WP    ::    ::    :: BK
   ::    ::    ::    ::
::    ::    :: WN :: WK
   ::    ::    ::    ::
::    ::    ::    ::    
   ::    ::    ::    ::
::    ::    ::    ::    


Promoting to Q or R draws by stalemate, b8=N is a trivial draw, not capturing the Queen loses.
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Steven Atkinson



Joined: 13 Oct 2010
Posts: 450
Location: Australia
PostPosted: Wed Mar 07, 2012 11:14 am    Post subject: Re: Wanted - Bishop promotion FEN Reply to topic Reply with quote
Cheers HG. You're quick Shocked Laughing
Scid fails on this unusual move when (gully and olithink for eg) sends "a7b8b".
Other promotions are fine. I suppose the b is getting confused with the b column , but i'll sort it out sometime soon.
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Steven Edwards



Joined: 13 Mar 2006
Posts: 3130
Location: Mud, Bugs, and Taxes, NH, USA
PostPosted: Wed Mar 07, 2012 11:20 am    Post subject: Re: Wanted - Bishop promotion FEN Reply to topic Reply with quote
[d]1q6/P6k/8/5N1K/8/8/8/8 w - - 0 1[/d]
   BQ    ::    ::    ::
WP    ::    ::    :: BK
   ::    ::    ::    ::
::    ::    :: WN :: WK
   ::    ::    ::    ::
::    ::    ::    ::    
   ::    ::    ::    ::
::    ::    ::    ::    

Symbolic says: Mate in 15
Code:

1 axb8=B Kg8 2 Kg6 Kf8 3 Kf6 Ke8 4 Ke6 Kd8 5 Ne7 Ke8 6 Bc7 Kf8 7 Nf5 Ke8 8 Nd6+
Kf8 9 Kf6 Kg8 10 Kg6 Kf8 11 Bd8 Kg8 12 Be7 Kh8 13 Nf5 Kg8 14 Nh6+ Kh8 15 Bf6#
1-0

All choices:
Code:

Kg4 LoseIn17
Kg5 LoseIn19
Kh4 LoseIn12
Nd4 LoseIn11
Nd6 LoseIn13
Ne3 LoseIn13
Ne7 LoseIn13
Ng3 LoseIn15
Ng7 LoseIn12
Nh4 LoseIn16
Nh6 LoseIn13
a8=B LoseIn17
a8=N LoseIn17
a8=Q LoseIn17
a8=R LoseIn17
axb8=B MateIn15
axb8=N Even
axb8=Q Even
axb8=R Even
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Jesús Muñoz



Joined: 13 Jul 2011
Posts: 707
Location: Madrid, Spain.
PostPosted: Wed Mar 07, 2012 11:23 am    Post subject: Re: Wanted - Bishop promotion FEN Reply to topic Reply with quote
Hello:

stevenaaus wrote:
Does anyone have a positon where the best move is a pawn promoted to bishop ? - Preferably with a capture. (eg a7b8b)


Here is an example from a real game:

Dragoslav Tomic (1-0) Frank Winzbeck (Dortmund, 1993).

[d]3rb2k/2P4p/6pP/p2B1pP1/Pp2pP2/1P2K3/8/8 w - - 0 1
   ::    BR BB ::    BK
::    WP    ::    :: BP
   ::    ::    :: BP WP
BP    :: WB :: BP WP    
WP BP    :: BP WP    ::
:: WP ::    WK    ::    
   ::    ::    ::    ::
::    ::    ::    ::    


---------------------

This is a very similar position to Muller's example:

http://www.redhotpawn.com/board/showthread.php?threadid=22147

[d]1r6/2P5/8/8/8/2N5/8/k6K w - - 0 1
   BR    ::    ::    ::
::    WP    ::    ::    
   ::    ::    ::    ::
::    ::    ::    ::    
   ::    ::    ::    ::
::    WN    ::    ::    
   ::    ::    ::    ::
BK    ::    ::    :: WK


---------------------

Other example (not only bishop underpromotion):

http://www.redhotpawn.com/board/showthread.php?threadid=22147

[d]Bq1B1K2/3Pp3/P3Pp2/P1p2P2/2Pk1b1R/1p6/pN1P1P2/QR6 w - - 0 1
WB BQ    WB    WK    ::
::    :: WP BP    ::    
WP ::    :: WP BP    ::
WP    BP    :: WP ::    
   :: WP BK    BB    WR
:: BP ::    ::    ::    
BP WN    WP    WP    ::
WQ WR ::    ::    ::    


---------------------

Some underpromotion examples:

http://timkr.home.xs4all.nl/chess2/minor.htm

---------------------

There was a nice position in RybkaForum about a bishop underpromotion that Rybka can not solve, but IPPOLIT family engines can. I have searched the position but I have not got success. There was something like gxh8=B, Qd6+ (or Qc7+ or Qb8+, I do not remember); Be5, ... I think that white king was on h2, black queen was on the eighth rank and white had a knight (maybe in c7, threatening Ne6).

---------------------

I have found some threads in RybkaForum:

http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=197299

http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=13050

---------------------

I wrote some FEN strings by hand, so may contain typos. Please be careful and I expect that these positions will be useful for you!

---------------------

In the position posted by Muller, Symbolic is right according to Online Shredder EGTB.

Regards from Spain.

Ajedrecista.
_________________
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Chess will never be solved.
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Steven Atkinson



Joined: 13 Oct 2010
Posts: 450
Location: Australia
PostPosted: Wed Mar 07, 2012 1:29 pm    Post subject: Re: Wanted - Bishop promotion FEN Reply to topic Reply with quote
Arrow Very interesting analysis.
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Arpad Rusz



Joined: 17 Apr 2010
Posts: 152
Location: Budapest
PostPosted: Wed Mar 07, 2012 1:53 pm    Post subject: Re: Wanted - Bishop promotion FEN Reply to topic Reply with quote
Three Bishop promotions:

V.Korolkov (64 1941)
[D]8/P1P3P1/P2n4/8/1n1pP1P1/3P1b1B/3P1p2/5Kbk w - - 0 1
   ::    ::    ::    ::
WP    WP    ::    WP    
WP ::    BN    ::    ::
::    ::    ::    ::    
   BN    BP WP :: WP ::
::    :: WP :: BB :: WB
   ::    WP    BP    ::
::    ::    :: WK BB BK

White wins

Four Bishop promotions:

R.Guy (Chess 1944)
[D]1n2N3/PPP5/n1B5/4bP1P/8/PNk5/P1p4p/K7 w - - 0 1
   BN    :: WN ::    ::
WP WP WP    ::    ::    
BN :: WB ::    ::    ::
::    ::    BB WP :: WP
   ::    ::    ::    ::
WP WN BK    ::    ::    
WP :: BP ::    ::    BP
WK    ::    ::    ::    

White wins
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