function that returns score of most related post. (YARPP)

I’m making the base of wordpress posts using Automatic Featured Image Posts Plugin. I added some functionality to the plugin, like post title = image name.

But some of the image names are very similar. Curently, I’m manually using YARPP to check the similarity score. I want to do it semi-automatic, something like: if it’s over modify the title ($title = ‘!!’.$title; ).

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In the readme.txt I found yarpp_related() but it returns (html ready) related items, without the score.

I tried to figure out which function could return the score of the most similar item (based only on title). Or a string containg the score. But, I feel so lost in the yarpp code.