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by onestone 4398 days ago
What sets Stockfish apart is its open testing framework. Many volunteers allocate CPU time to run test games, checking if a pull request actually adds Elo rating points. Also, its open development model is a big advantage compared to closed-source chess engines, which usually just have 1-2 developers. The ideas used are mostly the same in all top engines, the advantage of Stockfish comes from tuning/testing/polishing/tweaks.

An year ago Stockfish was near the top, but not quite there. Since then its development model became more open, and the open testing framework was introduced. The rate it's been adding Elo rating points since then has been amazing.