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Per Arpad Elo's original system (used in chess + many games), the ELO rating predicts win probability using which function of rating difference?
AExponential growth without normalisation
BLinear function of rating difference
CPolynomial of degree 4 in difference
DLogistic / sigmoid of rating difference
Answer & Solution
Correct answer: D. Logistic / sigmoid of rating difference
Elo 1978 + Wikipedia + FIDE rules: expected score E_A = 1/(1+10^((R_B-R_A)/400)) — a logistic curve over rating difference scaled by 400.
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