@willwmpie
Evolving a cross era comparision criteria is not difficult. I wrote this 4 pages earlier in the same thread. We can add or delete some criteria and measure all chess greats. I think, the result will be the same as Markovich concluded
1) Seemingly bad but not yet losing position, and the opponent gets worried instead of relaxing - Lasker, Petrosian, Kasparov, Topalov.
2) Shere on board personality commands awe and admiration bordering on intimidation - Alekhine, Kasparov and to some extent Topalov.
3) Head and Shoulders above the competion at peak - Alekhine, Fischer and Kasparov.
4) Point number 3 scaled on quality of oppostion - Kasparov, hands down.
5) Tactical genius - Tal, Kasparov.
6) Phenomenal Positional Understanding - Kasparov, Karpov, Kramnik, Petrosian, Fischer
7) Quick Assessment - Anand (Well, I had to fit in my country cousin some where). He along with Smyslov,Spassky et al, has about all the qualities near the peak but never at the peak.
8) Technique - Capablanca, Kramnik and Karpov.