This is a book by the horse racing YouTuber "Natsugonnya Nakai." It clearly explains the concept of focusing on expected value and practical perspectives for those who can't win at horse racing. I read it once and then kept it on my bookshelf. There are no noticeable stains or tears, and it is perfectly readable. Please check the condition in the photos. Please refrain from purchasing if you are overly concerned about condition. Recommended for horse racing beginners and those who want to rethink their approach.