Beating https://www.expunctis.com/2019/03/07/Not-so-random.html

not-so-random-indeed.js

const past = new Map();

let last = 'LRLRL';

for (let i = 0; i < 1000; ++i) {
    const stats = past.get(last) || {L: 0, R: 0};

    const choice = (stats.L >= stats.R) ? 'R' : 'L';
    console.log(choice);

    ++stats[choice];
    past.set(last, stats);
    last = last.substr(-4, 4) + choice;
}