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.
Promotion to bishop
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So here is the game:
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
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
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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.
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.
Underpromotion in Games
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
I've found it again:
Underpromotion in Games by Tim Krabbé
http://www.xs4all.nl/~timkr/chess2/minor.htm
CU, Joe
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- Joined: Thu May 11, 2000 7:57 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.
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.
Here's a "miniature" example of where promotion to rook is the only winning move:
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.
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.