[qsort]

In the overwhelming majority of situations including almost the totality of those you care about in practice, it's trivial to say "draw" or "no draw". I mean "technically correct" in this sense: imagine you're a programmer writing a chess game. At some point, you have to write a function "isPositionDrawn()" that takes as input a board position and says "true" if the game is over as a draw, false otherwise. What do you do?

- Trivial material checks don't work: even if you're sophisticated (light color vs. dark color bishops) there exist positions, even with pawns, that are drawn as per the rule as stated.

- Enumerating the game tree is obviously correct but it's too large to do in practice, we want an answer before the heat death of the universe.

So, what code do you put inside that function? If I'm not mistaken there is an "official" algorithm to do it, but it's very complicated, and in practice in computer chess a simplified version of the rule (a list of cases with "insufficient material") is used.

Again, it's mostly nerdy navel gazing, the consequences on actual play are minuscule, but it's interesting that many games have nontrivial termination if we follow the letter of the rules.