How does it all get worked out?
The basis of the table is that it takes into account each team’s current form, how well each team plays in a series – not just the overall score.
It takes into account whether a team is playing at home or away, who won the toss and the exact result of each match!
The table is changed in proportion to how many tests are played – thus winning a five test series is better than winning a two test contest
To gain from a series you have to win by a bigger margin (or lose by a lesser margin) than your (and your opponent’s) current standing suggests you will.
- Two teams contest the series – they come into it with scores X & Y and they will play a number of tests (T)
- They gain series points by winning matches (more points if away from home, more points if lost toss) or if they are the away team in a drawn match.
- Added to these points are the series run per wicket each team gets. (The away team’s runs per wicket is adjusted to reflect the away disadvantage).
|Win toss & win match||Lose toss & win match||Draw||Lose match||Series run-rate|
|Home||9.75||10.25||0||0||total runs scored / total wickets lost|
|Away||11.75||12.25||2||0||1.1 x total runs / total wickets|
- The series points are added up to give scores Q & R for each team. These are adjusted so that Q2+R2 = X+Y
- The number of tests is placed into a formula T/(T+6) to give the fraction (G) that the current series is worth of the team’s total points: (G x Q2) + (1-G)X = new table total e.g. if 3 tests are played the series points gained are worth 1/3 of their new total and their previous table score is worth 2/3.
|Sri Lanka - home team||England - away team|
|Existing score before series began||B & C||35.46||41.19|
|Total score available is B + C = 76.65|
|Test results||1 home win (away team won toss)||2 away drawers|
|Points scored from match results||Q||10.25||4|
|Total runs / wickets losts||1846/45||1437/56|
|Calculate run rates||R||41.02||Add 10% 28.23|
|Total scores gained from series||Q + R = Tot-home(H) & Tot-away(A)||51.27||32.23|
|Total score gained is H + A = 83.50|
|Adjusted series score to equal total points available||H-adj = H x (B+C)/(H+A) A-adj = A x (B+C)/(H+A)||47.06||29.59|
|The adjusted scores totalled together now equal the Total Score Available|
|The series is worth G and G=T/(T+6) where T is number of tests - therefore 3/(3+6) = 33.33% = G|
|New total||(G x H-adj) + ((1-G) x B) (G x A-adj) + ((1-G) x C)||1/3*47.06 + 2/3*35.46||1/3*29.59 + 2/3*41.19|
Check out the FAQ to see why these figures were chosen and also to see how the ratings have developed over the years.