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.

Try our new ranking point predictor (bottom of the screen):
Simply tick two teams (next to flags) in the rankings Quick Picker, then press "and Go!".
New buttons will appear next to each possible match outcome.
Click each of the 5 buttons to see that outcome reflected in the rankings.
Now choose another two teams (the next match) in the Quick Picker...and repeat...
For accuracy, fixtures must be entered in the order in which they will be played.
Subscribed users can make predictions on an unlimited number of matches.

Rating Points Exchange Calculator

Home	Rating	Away	Rating
1) Enter the current 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 part of a Rugby World Cup tournament?
4) Click

IRE (on 90.78 points) at home -vs- ENG (on 82.31 points)

Possible Outcome	Rating Point Exchange	New IRE Rating	New ENG Rating	Will ENG overtake IRE?
If IRE win by 1-15 points	0.000	90.78	82.31	No	press
If IRE win by more than 15	0.000	90.78	82.31	No	each button
If result is a draw	-1.000	89.78	83.31	No	to see the
If ENG win by 1-15 points	2.000	88.78	84.31	No	rankings
If ENG win by more than 15	3.000	87.78	85.31	No	change below

Quick Picker (simply tick a home box and an away box , then click "and Go!")

current rankings	form	home	away
92.78
90.78
90.36
88.52
84.97
83.35
82.31
81.52
78.65
74.01

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