Mahek takes a look at how the ICC calculates Test rankings:
it’s quite clear that there is no extra weightage for away wins (or home losses). This means that if a team plays a dispropotionate amount of cricket at home, it can go up the rankings. [...]
Also, the rankings don’t take into account the margin of victory/defeat. As far as they’re concerned, a 1-run win is just as good as a win by an innings and 400 runs. Similarly, a draw with both teams scoring an equal number of runs is the same as a draw in which a team was 1 wicket away from an innings defeat. [...]
I guess what I’m trying to say is there is way too much talk of ratings & rankings when all teams and fans should be worried about is their team trying to win every test they play. It doesn’t matter if you’re ranked 1 or 10, if you pull out of a chase with 15 overs to bat/bowl just because you’re tired or think it’s impossible to score 6 an over you’re cheating the fans of a proper result.
I have written before about the difficulty in determining the order of the superiority of the cricket teams. There are so many factors (victory margins, dead rubber matches, luck, weather and team changes) involved that you cannot make an accurate judgment. Of course, some things are beyond doubt, for example, that England is better than Bangladesh, but it is not clear whether Pakistan or New Zealand is a better team today. Trying to establish a fool-proof methodology is in itself foolish.
But all things considered, if we accord meaning to the Test rankings by the ICC, then everyone has to play by the ICC’s rules. So if Zimbabwe wants to be the #1 team in the world, then they need to earn the points under that framework. Also, you are allowed to celebrate when your team becomes #1, but you are not allowed to complain when another team achieves it under the same rules.
So, for India, if they think the #1 ranking is important, they can go play and earn the points to get it back. If they don’t believe that, that is fine too. But what is not negotiable is that India should go and not perform. As an Indian cricket fan, I want to see Dhoni and Co. go beat all the teams out there. If that makes a difference to their rankings, that is a bonus. But the important thing is playing well and trying to win, if not actually winning.