Author: Mike Byrne
Date: 13:58:42 08/22/03
Go up one level in this thread
On August 22, 2003 at 15:55:42, Drexel,Michael wrote:
>On August 22, 2003 at 15:52:37, Drexel,Michael wrote:
>
>>On August 22, 2003 at 14:59:13, Mike Byrne wrote:
>>
>>>On August 22, 2003 at 14:50:09, Mike Byrne wrote:
>>>
>>>>On August 22, 2003 at 14:39:35, José de Jesús García Ruvalcaba wrote:
>>>>
>>>>>On August 22, 2003 at 09:55:42, Mike Byrne wrote:
>>>>>
>>>>>>On August 22, 2003 at 09:42:38, Alastair Scott wrote:
>>>>>>
>>>>>>>[D]8/p2k2p1/1p6/5P1p/P5P1/5K1P/8/8 w - - 0 48
>>>>>>>
>>>>>>>How long does your engine take to see that gxh5 loses?
>>>>>>>
>>>>>>>(A surprisingly long time in some cases - for example, 12 seconds for Ruffian
>>>>>>>1.0.1, Athlon XP 2600+, 512MB RAM, 32MB hash).
>>>>>>>
>>>>>>>Alastair
>>>>>>
>>>>>>show me the win after gh5 , I can't find it ....and neither can crafty or
>>>>>>shredder
>>>>>
>>>>>It is very easy, black puts his king of f6, then creates a passed pawn with a6
>>>>>and b5, and the captures all white pawns on the kingside. The only thing white
>>>>>can try is to left black with an h-pawn, but that still loses. A posible
>>>>>variation
>>>>>1. gxh5? Ke7 2. h4 Kf6 3. Ke4 a6 4. h6 gxh6 5. h5 b5 6. axb5 axb5 7. Kd5 Kxf5 8.
>>>>>Kc5 Kg5 9. Kxb5 Kg4 10. Kc4 Ke3 and black wins
>>>>>White can also try leaving the pawn in h3 or h4, or moving the king first to f4
>>>>>instead of e4, but after 1. gxh5? black wins.
>>>>>José.
>>>>
>>>>nice try,but it doesn't work
>>>>
>>>>
>>>>1. gxh5? Ke7 2. Ke4! {h4? does lose} Kf6 3. Kd5 ! and after the pawns on the
>>>>Q-side cpme off, it is a draw - Black cannot force a win on the K-side.
>>>
>>>for example after 3. Kd5 Kxf5? 4.Kc6! wins for white - so black must play 3.
>>>...a6! any other move loses for black ...4.Kc6 ensures no outside passer
>>>survives and resulting position is a dead draw.
>>>
>>>[d] 8/6p1/5k2/1K3P1P/8/7P/8/8 b - - 0 6
>>>
>>>this is a book draw, if black plays Kxf5 - the simplest way to draw is h6!.
>>
>>Very good explanation.
>>
>
>[D] 8/4k1p1/pp6/5P1p/P5P1/5K1P/8/8 w - - 0 1
>
>>
>>This position requires even more skills.
>>Can white play 1.gxh5 and still draw this position?
I don't think so- a winning theme here to bring the Black King back to g8,
forcing white to play h6, because once the Black King comes up the h file, it's
all over. First after gh5, black plays b5, then white's a5 is forced - any
otehr move loses easily - this manuever effectively limits how far the white
king can roam
black, with proper use of zugzwang , will win this position IMO
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