BTTS combo markets — including 1 & GG, 2 & GG, Over 2.5 & BTTS Yes, Double Chance & BTTS, and 1X & GG — represent the most structurally complex segment of the Both Teams to Score betting universe. Each combination market carries distinct joint probability dynamics driven by the correlation structure between the individual outcomes: some pairings are positively correlated (home win & BTTS Yes, Over 2.5 & BTTS Yes) while others are nearly uncorrelated (draw & BTTS Yes) or weakly negatively correlated (clean sheet win & BTTS Yes). Dixon-Coles calibrated Bivariate Poisson modelling is the only met
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