Wanted - Bishop promotion FEN

[stevenaaus]

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

[hgm]

[d]1q6/P6k/8/5N1K/8/8/8/8 w - - 0 1

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

[stevenaaus]

Cheers HG. You're quick
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.

[sje]

[d]1q6/P6k/8/5N1K/8/8/8/8 w - - 0 1[/d]
Symbolic says: Mate in 15

Code: Select all

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: Select all

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

[Ajedrecista]

Hello:

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

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

http://www.redhotpawn.com/board/showthr ... adid=22147

[d]1r6/2P5/8/8/8/2N5/8/k6K w - - 0 1

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Other example (not only bishop underpromotion):

http://www.redhotpawn.com/board/showthr ... adid=22147

[d]Bq1B1K2/3Pp3/P3Pp2/P1p2P2/2Pk1b1R/1p6/pN1P1P2/QR6 w - - 0 1

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Some underpromotion examples:

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

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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).

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I have found some threads in RybkaForum:

http://rybkaforum.net/cgi-bin/rybkaforu ... pid=197299

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

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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!

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

Regards from Spain.

Ajedrecista.

[stevenaaus]

Very interesting analysis.

[Arpad Rusz]

Three Bishop promotions:

V.Korolkov (64 1941)
[D]8/P1P3P1/P2n4/8/1n1pP1P1/3P1b1B/3P1p2/5Kbk w - - 0 1
White wins

Four Bishop promotions:

R.Guy (Chess 1944)
[D]1n2N3/PPP5/n1B5/4bP1P/8/PNk5/P1p4p/K7 w - - 0 1
White wins