Partners Promoting Darts (PPD) requires at least 24 games of X01 and 24 games of cricket played to establish a player rating.
If you play in other leagues provided by your operator (such as the MAX leagues), they will consider those stats also. They prefer if everyone plays the same 501 formats (full bull/open out) so that it's an apples - apples comparison.
The majority of MAX players want to play split bull and master out in our MAX leagues. Maybe it's our steel tip heritage. Personally, I think it's a better game for the higher skilled players, but it does create a problem when comparing averages to players that play "Open Out".
In a Split Bull and/or Double or Master Out league, the 501 averages cannot be compared apples-apples. Therefore, the PPD applies a "conversion", where the player's cricket MPR is multiplied by 10 to determine the 501 average. This results in a much higher "estimated" rating. They simply multiply your cricket average times 10.
For example a player with an MPR of 3.0 is probably around 28 PPD. The conversion would be 3.0 x 10 = 30 PPD.
This is fairly close, but a player with a 4.0 MPR is probably around 33 PPD. The conversion would be 4.0 x 10 = 40 PPD. This results in players having to play in higher cap leagues or higher cap brackets in tournaments.