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First fail high drops in endgame

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José C. Martínez Galán

Joined: 08 Mar 2006
Posts: 147
Location: Murcia (Spain)

Post subject: Re: First fail high drops in endgame Posted: Wed May 30, 2007 7:48 am

bob wrote:

José Carlos wrote:

Tony wrote:

hgm wrote:

Did you ever measure this quantity before (with different result)? It seems normal to me that it is more difficult to find cut-moves in an end-game, as the information that distinguishes the winning from the losing moves is much more distant. In the middle game it is often decided by what is on the to-square, but in end-games it is what is on the square you are heading to in a number of moves.

Yes,
otoh, in the endgame, you accidently choose the right (good enough) move more often.

But in fine 70 , 78% is way too low. that should be 98% or something. (No nullmove, no lmr)
I've never seen it that low. It almost looks like a random choice. I'm overlooking something obvious, but I haven't got a clue.

Tony

I think that's normal behaviour due to hashing. If you prune much more due to hashing (like in Fine 70), you have less good-and-easy moves to search that would otherwise rise the FH at fist move rate.

that's backward. The better your hashing rate, the more frequently you have a good first move (hash move)...

I didn't make my point clear. What I meant is: if you probe the hash table and find a good move, you have good chances to have a cutoff in the first move, thus improving your FH at first move rate. But if the draft in the hash node is enough (and the score is good for a cutoff) you just return without searching. This case happens a lot in positions like Fine 70, and the nodes you really need to search are those you don't have good hashing information for them.
I haven't tested it, and my reasoning might be flawed, but seems logical to me.
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José Carlos Martínez Galán

Display posts from previous:

Subject	Author	Date/Time
First fail high drops in endgame	Tony	Mon May 28, 2007 7:49 pm
Re: First fail high drops in endgame	H.G.Muller	Mon May 28, 2007 8:45 pm
Re: First fail high drops in endgame	Tony	Mon May 28, 2007 8:56 pm
Re: First fail high drops in endgame	José C. Martínez Galán	Tue May 29, 2007 9:06 am
Re: First fail high drops in endgame	Robert Hyatt	Tue May 29, 2007 3:12 pm
Re: First fail high drops in endgame	José C. Martínez Galán	Wed May 30, 2007 7:48 am
Re: First fail high drops in endgame	Tony	Wed May 30, 2007 8:15 am
Re: First fail high drops in endgame	Robert Hyatt	Thu May 31, 2007 1:51 am
Re: First fail high drops in endgame	José C. Martínez Galán	Thu May 31, 2007 10:13 am
Re: First fail high drops in endgame	Robert Hyatt	Thu May 31, 2007 4:30 pm
Re: First fail high drops in endgame	Tony	Thu May 31, 2007 7:16 pm
Re: First fail high drops in endgame	Gerd Isenberg	Thu May 31, 2007 7:58 pm
Re: First fail high drops in endgame	Tony	Thu May 31, 2007 8:55 pm
Re: First fail high drops in endgame	Gerd Isenberg	Mon May 28, 2007 9:41 pm
Re: First fail high drops in endgame	Tony	Mon May 28, 2007 9:53 pm
Re: First fail high drops in endgame	Gerd Isenberg	Mon May 28, 2007 10:35 pm
Re: First fail high drops in endgame	Tony	Tue May 29, 2007 7:08 am
Re: First fail high drops in endgame	Tony	Tue May 29, 2007 11:13 am
Re: First fail high drops in endgame	Chan Rasjid	Tue May 29, 2007 8:28 am
Re: First fail high drops in endgame	Robert Hyatt	Tue May 29, 2007 3:10 pm
Re: First fail high drops in endgame	Tony	Wed May 30, 2007 11:52 am

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