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The evaluation value and value returned by minimax search
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Vincent Diepeveen



Joined: 09 Mar 2006
Posts: 1738
Location: The Netherlands
PostPost subject: Re: The evaluation value and value returned by minimax searc    Posted: Sun Mar 11, 2012 6:27 am Reply to topic Reply with quote
Ralph Stoesser wrote:
A="small delta => accurate evaluation"

For the perfect evaluation delta is 0. Let's look at the worst possible evaluation. Let's say the worst possible evaluation would always report a loss when the position is a win and vice versa. For a draw position the worst possible evaluation would always report a win. What about delta now? Delta would be obviously 0 again, because the worst possible evaluation is as reliable as the best possible evaluation. Now lets make the best possible evaluation a little weaker and the worst one a little stronger. We could say there is one position p for which the best evaluation report randomly the wrong and the worst evaluation the right outcome. In both cases delta would be the same small value. Therefore I think A is not true.


Your thinking path gets wrongly influenced by comparing apples with pears.

You start with win/draw/loss values and project those onto something
that works in centi-pawns.

If you redenate with WDL values you are busy with accurate logics,
where the notion of a 'delta' doesn't apply at all.

Logically you wrongly conclude A is not true, as your grammar didn't
support delta.

However if you use a fuzzy logic type evaluation, like chessprograms actually use already even before the buzzword 'fuzzy logic' was invented in the 90s, then suddenly delta exists.

So retry your logics and apply it now onto grammar where the notion of a delta does exist.
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Subject Author Date/Time
The evaluation value and value returned by minimax search Ma Chao Fri Mar 09, 2012 11:51 am
      Re: The evaluation value and value returned by minimax searc Joona Kiiski Fri Mar 09, 2012 12:06 pm
            Re: The evaluation value and value returned by minimax searc Pio Korinth Fri Mar 09, 2012 9:51 pm
            Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 5:34 am
            Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 5:58 am
                  Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 12:20 pm
                        Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 2:41 pm
                              Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 3:44 pm
                                    Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 3:47 pm
                                          Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 3:51 pm
                                                Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 3:55 pm
                                                      Re: The evaluation value and value returned by minimax searc Marco Costalba Sun Mar 11, 2012 4:04 pm
                                                            Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 4:10 pm
                                                                  Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 5:03 pm
                        Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 2:43 pm
                        Re: The evaluation value and value returned by minimax searc Uri Blass Sun Mar 11, 2012 3:07 pm
                              Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 3:23 pm
                                    Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 3:47 pm
                                          Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 3:50 pm
                                                Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 3:52 pm
                              Re: The evaluation value and value returned by minimax searc Joona Kiiski Sun Mar 11, 2012 3:42 pm
      Re: The evaluation value and value returned by minimax searc Han Chengye Sat Mar 10, 2012 2:22 am
            Re: The evaluation value and value returned by minimax searc Marco Costalba Sat Mar 10, 2012 12:48 pm
      Re: The evaluation value and value returned by minimax searc Ralph Stoesser Sat Mar 10, 2012 11:12 pm
            Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 6:27 am
      Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 5:09 am
      Re: The evaluation value and value returned by minimax searc Vincent Diepeveen Sun Mar 11, 2012 5:27 am
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