Re: [Bug-gnubg] Re: Different rollouts are good

[Joern Thyssen]

On Mon, Sep 30, 2002 at 11:05:17AM +0200, Jim Segrave wrote
> On Mon 30 Sep 2002 (10:09 +0200), ?ystein O Johansen wrote:
> > Hello list!
> > 
> > I'm forwarding this messages from the GammOnLine bulletin board. It is
> > basically a suggestion for rollouts from Kit Woolsey. I got his permission
> > to forward these messages.
> > 
> > I think we need some discussion about this. How do we want this, how to
> > make it available from the user interface, is it at all possible, etc.
> 
> I'm willing to try to code this. It would help if anyone has a brief
> overview of how the rollout code actually executes. 
> I would assume we simply add second pane to the Rollout settings
> window with:
> 
> Title: Evaluation for later plays
> 
> Selection:
> 
>   A toggle to turn the whole pane on/off
> Change evaluation for later plays [x]
> 
>   A numeric selector for when they become active:
> Change evaluation after play [   ]
> 
> Replicate the Evaluation portion of the current rollout window
> (predefined, user defined, search space, reduced 2 ply, cubeful
> chequer)
> 
> Add commands to replicate the set of rollout commands - 
> 
> set late-rollout enable off/on
> set late-rollout start  5       # switch to late-rollout settings on
>                                 # move 5
> set late-rollout cubeful on     # settings for late-rollout,
>                                 # co-responding to current commands

I would prefer something like:

set rollout late enable on
set rollout late chequerplay ...
set rollout late cubedecision ...
...

> I actually wonder if setting noise on rollouts either for the first or
> later plays actually has any sense?

No, but it's a part of the evalcontext so once you set up

set rollout late chequerplay

you'll automatically get a

set rollout late chequerplay noise 0.3

> 
> I'm assuming (I haven't started looking at the code yet), that there
> is a top level routine which directs the individual games rolled out
> and that during play, the evaluation settings are passed as a pointer
> to a struct (much the same way that say tutor mode uses a pointer to
> either the evaluation of analysis structs). In which case, the inner
> loop which does the plays within a rollout has to set the evaluation
> pointer based on how many plays into the game it is.

Yes, the interesting routines are:

RolloutGeneral     (the loop over games in the rollout)
BasicCubefulRollout   (the individual game in the rollout)

BasicCubefulROllout takes a rolloutcontext as a parameter, so you don't
have to change the prototype, just change the content of rolloutcontext.
Obviously, you must add some logic to BasicCubefulRollout that selects
the proper evalcontext based on the turn number (called iTurn in
BasicCubefulRollout).

Jørn


-- 
Joern Thyssen, PhD
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