Rybka 3 questions for NON experts

[chesstango]

i am talking about the popup engine parameters window, and for time games 8/8.
a) which are the pros and cons to tilt PRESERVE ANALYSIS?
b) which are the pros and cons to tilt PERSISTENT HASH ENABLED?
c) Should I use them simultaneously? or why or when one of them and not the other?
d) the name of the *.rsh file should be the same that the *.rph? Lets say rybka.rsh and rybka.rph? Or should i put different ones? The name of the *.rph in Persistent Hash Enabled should be the sameor other than the name of the *.rph in Persistent Hash Merge File?
Any other suggestions welcome.
Thx in advance.
Dr Wesler

[Sylwy]

i am talking about the popup engine parameters window, and for time games 8/8.
a) which are the pros and cons to tilt PRESERVE ANALYSIS?
b) which are the pros and cons to tilt PERSISTENT HASH ENABLED?
c) Should I use them simultaneously? or why or when one of them and not the other?
d) the name of the *.rsh file should be the same that the *.rph? Lets say rybka.rsh and rybka.rph? Or should i put different ones? The name of the *.rph in Persistent Hash Enabled should be the sameor other than the name of the *.rph in Persistent Hash Merge File?
Any other suggestions welcome.
Thx in advance.
Dr Wesler

Hi !

Read please:
http://rybkaforum.net/cgi-bin/rybkaforu ... l?tid=5576


Regards,
Silvian

[chesstango]

First of all thx for your reply;second,i read that link and is for experts, or is a mess of things.....;what i need ( a NON expert) is the answer in an easy and direct way (from maybe an EXPERT) to my easy and direct questions.
Thx again.

[Ovyron]

From an expert:

a) which are the pros and cons to tilt PRESERVE ANALYSIS?

Pro - When ON, the engine will remember the most important entries from her analysis so they are not overwritten. Coupled with Save/Load Hash this becomes very powerful because on a given position the analysis only becomes higher quality.

Con - If degrades performance so the best moves will be found faster without it ticked. If you're not going to save the hash for later use, I'd suggest keeping this OFF.

b) which are the pros and cons to tilt PERSISTENT HASH ENABLED?

Depends:

For Analysis mode:

Pro - Rybka will save all the main lines to a file in the hardisk, this means that future positions will be analyzed faster and backwards analysis will let Rybka remember everything so the quality is much better.

Con - You have to use it by interactive analyzing the positions that come from the root to have anything useful out of it as by itself it doesn't help much in one position.

For Play:

Pro - Same as above..

Con - Due to a bug Rybka will play learned moves instantly instead of improving their evaluation. This causes Rybka to play too fast and to play a three move repetition on a won position from the hash. The work around is to set Write Depth to a high number or to analyze the positions coming out of book offline.

c) Should I use them simultaneously? or why or when one of them and not the other?

As seen above, it depends on what do you want to use the engine for. For analysis in where you're going to spend several hours on a position without analyzing it interactively, it's good to have Preserve Analysis ON, and save the hash when you need to turn off your computer, then load the hash, set Preserve Analysis ON, and continue.

For interactive analysis in where you force the engine to analyze future moves, Preserve Analysis would be better OFF and Persistent Hash ON, to get maximum performance and learning.

For games you'd set them off because you don't want the bug to ruin your games.

d) the name of the *.rsh file should be the same that the *.rph?

The name doesn't matter, it doesn't even need to end with those extensions.

Or should i put different ones?

The names should be different because the hash saved and persistent hash are different things.

The name of the *.rph in Persistent Hash Enabled should be the sameor other than the name of the *.rph in Persistent Hash Merge File?

Persistent Hash Merge should only be used when you want to merge 2 different Persistent Hash files.

I didn't answer the other day because I thought this wasn't the answer you were looking for.

[chesstango]

Really,thx a lot!!!!