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Another windmill

Another windmill

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Valentin Rudenko
1st place WCCT 1972-5


White mates in 6

Your only hint (see GP? I give them 😉) is "windmill".

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I've just WIKI'd Windmill.

"A windmill is a machine that converts the energy of wind into rotational
energy by means of vanes called sails."

What kind of clue is that?

A first prize problem. 😲

This I will enjoy. Cheers.

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Originally posted by SwissGambit
Valentin Rudenko
1st place WCCT 1972-5
[fen]6r1/P1p5/2b4B/p5p1/k2P4/1R3p1r/p2p2Pb/K2B1R2 w - - 0 1[/fen]
White mates in 6

Your only hint (see GP? I give them 😉) is "windmill".
At first glance, the move I would consider first is Rb8 discovered check and then take the Rook on g8. Is that okay so far? Or maybe gxh3 is better? Yes, now I think gxh3 is better first because the Rb8 discoverec check can still be played. Now to figure out what black's best move is after 1.gxh3.

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Originally posted by RJHinds
At first glance, the move I would consider first is Rb8 discovered check and then take the Rook on g8. Is that okay so far? Or maybe gxh3 is better? Yes, now I think gxh3 is better first because the Rb8 discoverec check can still be played. Now to figure out what black's best move is after 1.gxh3.
If you play Rb8+ and Rxg8, you're letting black's king run.

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cant see mate in six however g2xh3 bd5 rb2+ ka3

rxd2 bf4 rfxf3 bdxf3

rxa2+ kb4 bxf3 and white is better

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Originally posted by SwissGambit
If you play Rb8+ and Rxg8, you're letting black's king run.
I am getting to tired to think about it anymore now. I'm going to have to get some sleep. So I'm going with 1.gxh3 to start right now. I'll work on it some more later unless I come back and it is already solved.

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Originally posted by RJHinds
I am getting to tired to think about it anymore now. I'm going to have to get some sleep. So I'm going with 1.gxh3 to start right now. I'll work on it some more later unless I come back and it is already solved.

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got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

rb7 + ka3 rxf3 ++

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Originally posted by rookorbycrook
got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

rb7 + ka3 rxf3 ++
What happens if black plays 1...Rxg3 instead of 1...Rxh6 ?

I think you got the right ending idea, but I still think 1.gxh3 is the best first move.

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Originally posted by SwissGambit
Valentin Rudenko
1st place WCCT 1972-5
[fen]6r1/P1p5/2b4B/p5p1/k2P4/1R3p1r/p2p2Pb/K2B1R2 w - - 0 1[/fen]
White mates in 6

Your only hint (see GP? I give them 😉) is "windmill".

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So how to continue for checkmate in 6?

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Originally posted by RJHinds
[pgn]
[FEN "6r1/P1p5/2b4B/p5p1/k2P4/1R3p1r/p2p2Pb/K2B1R2 w - - 0 1"]
1. gxh3 Bd5 2. Rb8+ Ka3 3. a8=Q Bxa8 4. Rb3+ Ka4 5. Rb2+ Ka3 6. Rxf3 {CHECKMATE!}
[/pgn]
This one does not work because of 6... Bxf3.
The 2nd one is the only one that works, but black does not make best moves.

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Originally posted by rookorbycrook
got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

rb7 + ka3 rxf3 ++
I can't come up with anything that covers everything that black might do. Your line works, however, 1...Rxg3 might be better for white since it guards f3 from your final checkmate move of Rxf3. Perhaps, there is something else in that line that could be done that I do not see after 1.g3 Rxg3. Have you figured that out?

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Originally posted by rookorbycrook
got it ! g3 rxh6 rb8+ ka3 a8=qu bxa8 rb3+ ka4

rb7 + ka3 rxf3 ++
Okay, I see how your idea works now. That g3 first move seemed very unlikely move to me and I would never have considered it, if you had not brought it up. I almost dismissed it anyway, but I could not get my line to work.