Rybka Chess Community Forum
so what does this option mean? does it add winning postion to hash? Good or bad?
*sigh* From the FAQ
>8) Win Percentage to Hash Usage: False by default; if true, then the estimated winning percentage for the current position (from the white point of view) is sent as the "hashfull" value. Some user interfaces (e.g. Arena, Shredder GUI) display this value somewhere in the engine pane.
I don't think this really answers the question, nor does this provide much in the way of useful information. For example, what does one mean by "the estimated winning percentage for the current position (from the white point of view) is sent as the 'hashfull' value"? Furthermore, in which cases might one want to set this value to "True"? I guess I feel somewhat perturbed here, also, considering that I was only recently referred by someone to a FAQ concerning a question I had about the new Hiarcs version, when it was painfully obvious to any idiot that the question asked went considerably beyond what was answered in the FAQ and asked about a number of points obviously not contained in the FAQ.
> For example, what does one mean by "the estimated winning percentage for the current position (from the white point of view) is sent as the 'hashfull' value"?
Just that: The current evaluation is converted to the percentage white is expected to score from the current position. If your GUI shows the 'hashfull' value, i.e. the percentage of hash used, you'll see Rybka's evaluation instead of a constant 0%.
> Furthermore, in which cases might one want to set this value to "True"?
If you want to see Rybka's eval as a win percentage, you'll want to set it to true. Unless you're using ChessBase, Fritz, ChessPartner, Chess Assistant or one of the other GUIs that don't show the hash percentage anywhere.
Okay, this is starting to make a bit of sense. I had never heard of this type of function in any engine or GUI (and I'm guessing that the person asking the qusetion hadn't, either)--and yet it's kind of useful in terms of analysis with various engines in getting to know what is really a "winning" score for that particular engine. For example, I have seen Shredder 10 give a score of +7 on numerous occasions in completely drawn positions, though I don't think I've ever seen Rybka 2.3.2 give a score of more than +3 without eventually winning the game. So I guess this would mean that with Shredder 10, this percentage might be something like 85% with a score of +3, 90% with a score of +4, 95% with a score of +6, etc. (and obviously 100% with mate scores like +279.87, etc.), and with Rybka, it would be something like 95% with a score of +2.50, 99% with a score of +3, and 100% for higher scores.
Please note that these percentages are really not very good. There are all sorts of issues about how to collect them, etc.
Powered by mwForum 2.27.4 © 1999-2012 Markus Wichitill