Yes.Richard Bates wrote: ↑Mon Dec 10, 2018 3:52 pmI’m struggling. Is the definitely the correct position?
Under promotion to a bishop.
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David Williams
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Re: Under promotion to a bishop.
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Richard Bates
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Re: Under promotion to a bishop.
White to play and win?David Williams wrote: ↑Mon Dec 10, 2018 8:27 pmYes.Richard Bates wrote: ↑Mon Dec 10, 2018 3:52 pmI’m struggling. Is the definitely the correct position?
EDIT: very nice.
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Reg Clucas
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Re: Under promotion to a bishop.
Indeed. I got as far as the crucial promotion, at which point I thought that surely a Knight promotion is the only way to win, with a Bishop only drawing. But in fact the reverse is true.
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John Clarke
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Re: Under promotion to a bishop.
Underpromotion to B where White has minimum K+P (study by Harold Lommer, date unknown).
White to win.
Lommer had a very amusing tale to tell about the difficulties he had composing this piece - see Assiac's The Delights Of Chess, where the study is reproduced on p22.
OK: if you had little or no trouble with that one, here's another that will really sort the men from the boys (and I'm definitely a boy when it comes to this sort of thing). Study by V A Korolkov, 1959.
White to win.
This is also in Assiac's book, where it's noted that Lommer had composed at least two other studies each featuring four separate underpromotions to Bishop. Maybe someone could track those down.
White to win.
Lommer had a very amusing tale to tell about the difficulties he had composing this piece - see Assiac's The Delights Of Chess, where the study is reproduced on p22.
OK: if you had little or no trouble with that one, here's another that will really sort the men from the boys (and I'm definitely a boy when it comes to this sort of thing). Study by V A Korolkov, 1959.
White to win.
This is also in Assiac's book, where it's noted that Lommer had composed at least two other studies each featuring four separate underpromotions to Bishop. Maybe someone could track those down.
"The chess-board is the world ..... the player on the other side is hidden from us ..... he never overlooks a mistake, or makes the smallest allowance for ignorance."
(He doesn't let you resign and start again, either.)
(He doesn't let you resign and start again, either.)
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David Williams
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Re: Under promotion to a bishop.
Just to put this one to bed.
The stalemate position is easy enough for the composer to visualise, but to add just the two h pawns, to leave a position where two dark square bishops win, but one bishop, or bishop and knight don't? Brilliant. And note that after 7 Nb8=N+ Kb7, both 8 Na6, and 8 Nd7 Kc8 9 Nf8 both fail by a single move.
The stalemate position is easy enough for the composer to visualise, but to add just the two h pawns, to leave a position where two dark square bishops win, but one bishop, or bishop and knight don't? Brilliant. And note that after 7 Nb8=N+ Kb7, both 8 Na6, and 8 Nd7 Kc8 9 Nf8 both fail by a single move.
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Simon Rogers
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Re: Under promotion to a bishop.
I saw a club game at Poulton Chess Club a number of years ago.
The game was an interesting tactical game and featured a friend called Steven Gardner but can't remember his opponent.
Anyway, I can't remember the exact position. He under promoted to a knight which checkmated his opponent.
Any other promotion or under promotion was stalemate.
The game was an interesting tactical game and featured a friend called Steven Gardner but can't remember his opponent.
Anyway, I can't remember the exact position. He under promoted to a knight which checkmated his opponent.
Any other promotion or under promotion was stalemate.
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Rewan Demontay
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Re: Under promotion to a bishop.
Here are two chess problems that both show the maximum amount of bishop promotions done so far in study and a directmate.
Михаил Афанасьевич инар, Friendship-200 JT Achalgazdra Kommunisti 1983, 1st Special Honorable Mention
White to play and win
Solution here-https://www.yacpdb.org/#275117
David Zimbeck, Die Schwalbe 2003
Checkmate In 6 Moves
Solution here-https://pdb.dieschwalbe.de/P1255069
Михаил Афанасьевич инар, Friendship-200 JT Achalgazdra Kommunisti 1983, 1st Special Honorable Mention
White to play and win
Solution here-https://www.yacpdb.org/#275117
David Zimbeck, Die Schwalbe 2003
Checkmate In 6 Moves
Solution here-https://pdb.dieschwalbe.de/P1255069
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