kill-cp-red.js

function d6() {
  return Math.floor(Math.random()*6)+1;
}
function kill() {
  let hp = 40;
  let sp = 7;
  let turn = 0;
  while (hp > 0) {
    let d = d6() + d6();
    if (d === 12) hp -= 5;
    if (sp > 0 && d > sp) {
      d -= sp;
      sp--;
      hp -= d;
    } else if (sp == 0) {
      hp -= d;
    }
    turn++;
  }
  return turn;
}

let turns = 0;
for (let i = 0; i < 1000; i++) {
  turns += kill();
}
console.log(turns / 1000);