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I have bought books by the Flying Dutchman and have press cutting from the old handicap book. The formula for finding the class horse is slightly different from what you say I don't know if you have done this purposely because in the Flying Dutchmans original articals some of the components to his theory were missing and you had to try and work them out. It works better on the flat because the ground in theory stays the same for a long time, the original time ratings are long gone along with the handicap book and the class rating was created using the old Sporting life form I have used it on the Racing post form but the 4th piece of the rating formula is to find a good separate rating system and use that. I had some success with the system however patience is a virtue waiting for decent racing and also there is wait for the racing to settle down because all the horses must have recent runs other wise before you start you have a unknown factor in debutants which are difficult to weight up.