Depending on the position of the sun or the direction of the wind, the choice of which goal to defend first could make a difference to the game’s outcome. A neutral mechanism needs to be put in place to decide who obtains this “first mover advantage”. A coin toss is one such mechanism.
The coin is considered “fair” if both events – the coin landing on heads or the coin landing on tails – have an equal probability of occurring. In the history of minting, heads on the obverse and tails on the reverse have emerged as the two sides shown on coins which serve as legal tender.