[heinrich5991]

In chess you can also have a draw.

Either by having the player agree to a draw, or by killing every piece that is not the kings.

[antouank]

Right. But then again, you cannot say it's 100% that player A or player B will win, right? There's a chance for draw that is not negligible.

[psuter]

One common way to represent the probability of outcomes in chess as a single number (e.g. in comparing opening lines) is to say "white gets 55% of the points", which aggregates wins and draws. (So for instance if white wins 50%, draws 25% and loses 25% of the games, it gets 0.5 * 1 + 0.25 * 0.5 + 0.25 * 0 = 62.5% of the points.)

[umanwizard]

In fact, at top levels of play, draw rates are 40% or higher.