rating point exchange

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If you've ever tried to get your head around how the World Rugby Rankings work, this might help.
Based on this detailed explanation on the World Rugby website, the following program emulates the method used for calculating rating points exchange; the basis of the official ranking system.
The same algorithm is used for building pick & go's ranking history and Super Rugby rankings.

Rating Points Exchange Calculator

Home	Rating	Away	Rating
1) Enter the super ranking points of the	team here:	&	team here:
(for example... WAL	76.92	SCO	76.36)
2) Is the match being played at a Neutral venue (where neither side has Home Advantage)?
3) Is this match a Super 15 semi or final?
4) Click

CHI (on 86.5421 points) at home -vs- FOR (on 78.8384 points)

Possible Outcome	Rating Point Exchange	New CHI Rating	New FOR Rating	Will FOR overtake CHI?
If CHI win by 1-15 points	0.000	86.54	78.84	No
If CHI win by more than 15	0.000	86.54	78.84	No
If result is a draw	-1.000	85.54	79.84	No
If FOR win by 1-15 points	2.000	84.54	80.84	No
If FOR win by more than 15	3.000	83.54	81.84	No

This web page is dynamically generated by PHP which queries a MySQL database.