I have created a Gomoku(5 in a row) AI using Alpha-Beta Pruning. It makes move on a not-so-stupid level. First let me describe the grading function of the Alpha-Beta algorithm. When it receives a board as an input, it first finds all repetitions of stones and gives it a score depending on its usefulness as an threat. And it will return the summation of all the repetition scores.
But, the problem is that I explicitly decided the scores(4 in total), and they don’t seem like the best choices. So I’ve decided to implement a genetic algorithm to generate these scores. Each of the genes will be one of 4 scores. So for example, the chromosome of the hard-coded scores would be: [5, 40000,10000000,50000]
However, because I’m using the genetic algorithm to create the scores of the grading function, I’m not sure how I should implement the genetic fitness function. So instead, I have thought of the following:
Instead of using a fitness function, I’ll just merge the selection process together: If I have 2 chromosomes, A and B, and need to select one, I’ll simulate a game using both A and B chromosomes in each AI, and select the chromosome which wins.
1.Is this a viable replacement to the Fitness function?
2.Because of the characteristics of the Alpha-Beta algorithm, I need to give the max score to the win condition, which in most cases is set to infinity. However, because I can’t use Infinity, I just used an absurdly large number. Do I also need to add this score to the chromosome? Or because it’s insignificant and doesn’t change the values of the grading function, leave it as a constant?
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