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An instructive problem

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Uri Blass

Joined: 08 Mar 2006
Posts: 5958
Location: Tel-Aviv Israel

Post subject: Re: An instructive problem Posted: Wed May 30, 2007 9:52 pm

mambofish wrote:

I am seriously impressed that you admit checks in the qsearch! How do you know which move is a check without searching? I did try that once but abandoned it as too costly Sad

Leaving that aside though, the problem I have with this explanation is simply that movei's own analysis doesn't appear to support your conclusions. The fact that movei considers the best response to 3 .. f6 to be a sequence of moves starting with Qh8+ must surely indicate it hasn't seen the consequence of g6. Otherwise that line would terminate much earlier.

Please understand that I intend no disrespect by this - I am sure that movei would eat ermintrude for breakfast. But I don't accept the explanation that some sort of static analysis after g6 is somehow directing movei to find Bg4 as a better move Smile

Kind regards
Vince

1)I explained that I also have pruning and not only checks in the qsearch so movei simply did not search after g6 so it did not get into the qsearch.

The checking line was not pruned but g6 is a quite move so it did not cause extension and together with the pruning that I do after g6 based on evaluation black moves were not searched.

2)I know that a move is check without searching simply based on the from and the to square of the piece(in most cases they tell me that it is not check).

Movei can solve wac number 1 in depth 2 thanks to checks in the qsearch.

New game
2rr3k/pp3pp1/1nnqbN1p/3pN3/2pP4/2P3Q1/PPB4P/R4RK1 w - - 0 1

Analysis by Movei00_8_403:

1.Nf6-e8
³ (-0.69) Depth: 1 00:00:00
1.Nf6-e8
³ (-0.39) Depth: 2 00:00:00
1.Nf6-e8
² (0.31) Depth: 2 00:00:00
1.Nf6-e8 Rd8xe8 2.Ne5xf7+ Be6xf7 3.Qg3xd6
+- (2.27) Depth: 2 00:00:00
1.Qg3-g6
+- (2.28) Depth: 2 00:00:00
1.Qg3-g6
+- (2.57) Depth: 2 00:00:00
1.Qg3-g6 f7xg6 2.Ne5xg6#
+- (#2) Depth: 2 00:00:00
1.Qg3-g6 f7xg6 2.Ne5xg6#
+- (#2) Depth: 2 00:00:00

(, 31.05.2007)

Uri

Display posts from previous:

Subject	Author	Date/Time
An instructive problem	mambofish	Fri May 25, 2007 6:23 pm
Re: An instructive problem	Pradu Kannan	Fri May 25, 2007 7:31 pm
Re: An instructive problem	Gerd Isenberg	Fri May 25, 2007 8:05 pm
Re: An instructive problem	Vincent Diepeveen	Sat May 26, 2007 7:19 pm
Re: An instructive problem	mambofish	Wed May 30, 2007 12:47 am
Re: An instructive problem	mambofish	Fri May 25, 2007 8:10 pm
Re: An instructive problem	Vincent Diepeveen	Sat May 26, 2007 7:17 pm
Re: An instructive problem	Uri Blass	Wed May 30, 2007 12:57 pm
Re: An instructive problem	mambofish	Wed May 30, 2007 3:24 pm
Re: An instructive problem	Uri Blass	Wed May 30, 2007 4:06 pm
Re: An instructive problem	mambofish	Wed May 30, 2007 9:02 pm
Re: An instructive problem	Alessandro Scotti	Wed May 30, 2007 9:35 pm
Re: An instructive problem	mambofish	Wed May 30, 2007 10:00 pm
Re: An instructive problem	Alessandro Scotti	Wed May 30, 2007 10:14 pm
Re: An instructive problem	Uri Blass	Wed May 30, 2007 9:52 pm
Re: An instructive problem	mambofish	Wed May 30, 2007 10:40 pm

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