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problem 280

 
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paul morris
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Joined: 01 May 2006
Posts: 1

PostPosted: Mon May 01, 2006 8:04 am    Post subject: problem 280 Reply with quote

moving rook to g8 results in a quicker mate. why wount program
respond to that move? Paul.
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mrmip
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Joined: 05 Nov 2005
Posts: 230
Location: Finland

PostPosted: Wed May 10, 2006 8:03 am    Post subject: Reply with quote

1. Rg8? is refuted simply by 1.- Nf4 . For example 2.R (any) Nxh3 .

I guess the 5 moves is too 'deep' for the applet to calculate in reasonable time and providing responses to all white moves too much of a burden for problem setter.
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LCzlapinski
Master


Joined: 03 Sep 2005
Posts: 89
Location: Pennsylvania, USA

PostPosted: Tue Jul 04, 2006 11:54 am    Post subject: Reply with quote

mrmip: "1.Rg8? is refuted simply by 1.-Nf4. For example 2.R(any) Nxh3."
Close. 1.Rg8? is refuted simply by 1.-Nf4. But 2...Nxh3 doesn't work after 2.Rg4, 2.Rg5 or 2.Rg7 because after 2...Nxh3??? 3.gxN black is in zugswang (must move the bishop) B (any) 4.Rg1#.
Yes, 5 moves is currently too 'deep' for the applet to calculate in a reasonable time.
I added some 1.Rg8 lines to help chess problems out.
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mrmip
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Joined: 05 Nov 2005
Posts: 230
Location: Finland

PostPosted: Thu Jul 06, 2006 5:40 am    Post subject: Reply with quote

LCzlapinski wrote:

Close. 1.Rg8? is refuted simply by 1.-Nf4. But 2...Nxh3 doesn't work after 2.Rg4, 2.Rg5 or 2.Rg7 because after 2...Nxh3??? 3.gxN black is in zugswang (must move the bishop) B (any) 4.Rg1#.


..And after 4.Rg1#(??) simply 4. ... hxg1=N (for ex.) Smile

I still hold this as gospel:
"1. Rg8? is refuted simply by 1.- Nf4 . For example 2.R (any) Nxh3 . "
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LCzlapinski
Master


Joined: 03 Sep 2005
Posts: 89
Location: Pennsylvania, USA

PostPosted: Sat Jan 06, 2007 10:23 am    Post subject: Reply with quote

mrmip wrote:
LCzlapinski wrote:

Close. 1.Rg8? is refuted simply by 1.-Nf4. But 2...Nxh3 doesn't work after 2.Rg4, 2.Rg5 or 2.Rg7 because after 2...Nxh3??? 3.gxN black is in zugswang (must move the bishop) B (any) 4.Rg1#.


..And after 4.Rg1#(??) simply 4. ... hxg1=N (for ex.) Smile

I still hold this as gospel:
"1. Rg8? is refuted simply by 1.- Nf4 . For example 2.R (any) Nxh3 . "

You're right.
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