This is the scenario I'm talking about. Green filled, black edged are transactions of the honest network. Red edged - are transactions of the attacker. The doublespends are filled with yellow.
As far as I understand your algo, weight of the red tip is greater by 3 than weight of the green tip.
As far as I understand your algo, weight of the red tip is greater by 3 than weight of the green tip.
Does this assume that the merchant waited for enough confirmations? Because his transaction seems to have very little confirmation.