RE: [Bug-gnubg] Permit GNU to consider deliberate cube errors

[Albert Silver]

> Albert Silver Sent: 25 July 2006 16:11
> > Ex:
> >
> > Move 1 - Correct Play: D/Take    Played: No double  My Error: -0.048
> > Move 2 - Correct Play: D/Pass    Played: No double  My Error: -0.178
> > Move 3 - Correct Play: too good  Played: D??/Take?? My Error: -0.078
> >
> > In this case, the take was a (supposing) 0.560 mega blunder.
> > It couldn't be much less for taking a double in a Too Good
> > position. In this case, since there was a blunderous Take,
> > not only is the wrong double deducted from the equity lost by
> > the take, but the immediately preceding errors I made by not
> > doubling are also added up. This gives 560 - 48 - 178 - 78 =
> > a single 0.256 blunder for my opponent.
> 
> This is simply wrong. Your opponent has made a 0.56 blunder, and must be
> charged for it irrespective of your errors.

The point is to balance out my error with his. If in absolute terms, I did
indeed sacrifice equity, to gain further equity, then that sacrificed equity
shouldn't be ignored, should it? Since the idea is to not be punished for
this, the only logical way I see is to deduce it from larger equity loss of
my opponent.

> 
> > B) Suppose, just as above, the following happens:
> >
> > Move 1 - Correct Play: D/Take    Played: No double  My Error:  -0.098
> > Move 2 - Correct Play: D/Pass    Played: D/Take??   His Error: -0.178
> >
> > I deliberately waited to double, not quite as extremely as
> > above, but enough so that the correct decision is a
> > Double/Pass now. As planned (hoped for), my opponent takes
> > this and commits a 0.178 blunder. Since my previous decision
> > to not double has been vindicated by an even larger take
> > decision by my opponent, my opponent is judged with a 0.080
> > bad move (178 - 98), and I am given nothing.
> 
> Again, your opponent's error is simply 0.178. The cube is on the board
> to be taken or dropped. It matters not to him WHY it is sitting there,
> just as it is irrelevant whether it is an initial double or redouble.
> 
> You are asking gnubg to evaluate plays in the light of previous and
> future plays. 

Not future plays. I don't think you followed quite what I wrote. It only
reevaluates an immediately previous error if there was a mistaken take or
drop. There are three scenarios:

1) I double too early, and the opponent drops. My mistaken double is
vindicated by the larger drop.

2) I double too late (double/pass), and the opponent takes. The double is
correct, but due to my opponent's blunder of taking, GNU sees if the
*immediate* previous moves were errors for not doubling, and deducts the
sacrificed equity from my opponent's blunder.

3) I double too late (Too Good), and the opponent takes. My mistaken double
is vindicated by the larger take. Again, due to my opponent's blunder of
taking, GNU sees if the *immediate* previous moves were errors for not
doubling, and deducts the sacrificed equity from my opponent's blunder.

                                                Albert


>Where would one draw the line? Suppose you make a dubious
> cube in game six to get your opponent steamed up. Do you want credit for
> his dubious take in game 11?
> 
> I don't see any way to get a consistently meaningful evaluation of
> induced errors. Judging intent is best left to humans.
> 
> -- Ian
> 
>