竞技场积分赛：胜负积分的晋级规则

local function result(actor, win)
    if win then
        setplayvar(actor, "SCORE",
            getplayvar(actor, "SCORE") + 1)   -- 只计数无段位
    end
end

local function result(actor, win)
    local delta = win and 25 or -20
    local score = math.max(
        getplayvar(actor, "SCORE") + delta, 0)   -- 积分不为负
    setplayvar(actor, "SCORE", score)
    local tier = score >= 300 and "钻石"
        or (score >= 150 and "黄金" or "白银")
    sendmsg(actor, 1, "积分 " .. score .. "，段位 " .. tier)
end