Is somebody interested by this rather strange question (in the subject) ?
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black to play
What is you evaluation of the position ?
Suppose that a GMI has the white side and a beginner has the black side. The very first goal of the GMI in this game was indeed to verify that is pupil has understood one of the more common combination of the game!
In this context white hope that black will choose 23-29 but, at the same time, because this GMI is facing a beginner, he knows perfectly that is is taking no risks at all and, even with 2 men down, he surely evaluates is chance of winning to a number very near from 100% let's say 99,99%.
The evaluation of the position, for white point of view is here really a very high number.
Fisrt conclusion : the evaluation depends on the strength difference between the two players
Now let's suppose two players of the same strength and let's take the 2 following positions :
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What is your feeling about this 2 positions. Do they have the same evaluation ?
This is an important point to understand. One of the difficulty of draughts game is that we can have 3 possible results (win, draw or loss). In GO the result of a game is "normaly" win or loss.
As a consequence it is not easy to evaluate a given position with only one number. Why then not trying to use 2 numbers (3 numbers but with a sum equal to 100) ?
In the first position (20 men against 20 men) you may have the following evaluation :
15% win, 70% draw, 15%loss
In the second position (10 men against 10 men) you may have the following (different) evaluation :
5% win, 90% draw, 5%loss
Of course it is quite different but which is the best ? In my view the choice has to be made taking into account a "profil" for the two players.
The profil of a player is its goal, and its goal is somewhere between the 2 extremes :
profil 1 : to maximise the chance to obtain a win
profil 2 : to minimise the chance to concede a loss
The profil of a player could be then a number equal eg to 0 for profil 1, to 100 for profil 2 and to a number between 0 and 100 for all other profils.
Depending on your profil you may prefer position 1 or 2 and that means that the 2 positions must not have the same value.
Example : a strong player hoping to win a major tournament will certainly, at the beginning of a tournament, adopt a profil near profil 1. But in the last round, if the same player need only a draw in order to win the tournament, he would normally prefer to adopt a profil near profil 2.
Complementary question : ignoring the difficulty for the corresponding algorithm, do you think that it could be interesting to have :
"evaluation for white point of view" + "evaluation for black point of view != 0
In the initial position, 2 players having the profil 1 could be both rather happy, couldn't they ?
What is you feeling ? Do you think that it could be interesting to take into account such profils in order to calculate the evaluation of a position ?
I did not try such approach in Damy but it looks like something fun for the future.