Zero sum means that when one player gains an advantage of +1, another player loses the advantage. Chess is a perfect example. Monopoly does not count as positi

Zero sum means that when one player gains an advantage of +1, another player loses the advantage. Chess is a perfect example. Monopoly does not count as positive sum IMO because when other players get rich, you end up paying more rent. Cooperative games where multiple players are good vs a few bad ones may be positive sum.