Board Thread:Dragon City Questions and Answers/@comment-120.141.224.65-20130512014325/@comment-3271569-20130514110111

Yes breeding boost will decrease your chance on an pure dragon because:
 * Wind Level 4 (lowest earning):

So the minimal combination rating when breeding pure (wind + wind lv 4) is. So even on the lowest possible breedable dragon and level you already unlock all dificulty slots.

So how higher your legend dragons level, how higher your rating will be become.

Now in the example on wind vs wind level 4 your chance on an dificulty 2 slots (where an pure can be located to) is 11/25. So how more dificulty 3 slots you unlock how lower your chance to get pure.

Other dragons located in these dificulty 2 slots are: Category:Dragons/Dificulty 2