The best BTTS prediction site (both teams to score, also known as GG — goals/goals in European betting markets) models the probability that both teams score at least one goal during a match. This requires computing the complement of all scorelines where at least one team scores zero: 1 − P(Home scores 0) − P(Away scores 0) + P(Both score 0). As a function of each team's independent Poisson scoring rate, BTTS probability is highly sensitive to defensive quality — teams with low xG conceded rates suppress opponent scoring probability significantly, making BTTS predictions acutely model-dependent
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