The point structure works in reverse order depending on the number of horses.  This means that in a field of 6 horses the winner will receive 7 points.
                        
                                
                                    | 1st | 25 points | 
                                    | 2nd | 20 points | 
                                    | 3rd | 16 points | 
                                    | 4th | 13 points | 
                                    | 5th | 11 points | 
                                    | 6th | 10 points | 
                                    | 7th | 9 points | 
                                    | 8th | 8 points | 
                                    | 9th | 7 points | 
                                    | 10th | 6 points | 
                                    | 11th | 5 points | 
                                    | 12th | 4 points | 
                                    | 13th | 3 points | 
                                    | 14th | 2 points | 
                                    | 15th | 1 points |