What does ELO stand for?

Related questions

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5. What does PPD stand for?
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7. How is ELO calculated?
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Tags

1. #professor
2. #levels
3. #named
4. #skill
5. #creator
6. #physics
7. #chess
8. #games
9. #calculating
10. #system
11. #method
12. #relative
13. #american
14. #arpad
15. #players
16. #after
17. #hungarian
18. #rating