Chance of winning a 8v8 attacking with no bonus is 47.1%, therefore the reroll gives you for ONE battle 72% chance of winning, not bad.
1. where does "47.1%" come from too?
2. Your odds do not increase each time you roll. They are the same odds, each roll. This is math 101. If you roll a 6 sided die, the odds of getting a 6 is 1/6. If you roll the die again, the odds of getting a 6 are 1/6. The odds do not change, no matter how many times you roll.
Winning a 7v8, sill attacking is 27.4%, so with a reroll it's 52.7.
Same questions/points for this statement.
Either way, the point is that the boosts can help... but the odds are not change at all roll to roll. They are the same. All it is, is a second roll with the same odds. This can be useful when used correctly, and a waste when not. As I stated before, it seems more beneficial when going against equals or at best, 1 off equal. Beyond that, it is most likely to lose both times 2 off or more, as a 5 to a 3, or 8 to a 6, etc would typically do. Again, just one more chance, with the same odds.