I'd also like to see something of a chess Turing test, and while very hard to quantify a competition for the most human-like low- or mid-level chess engine. On Chess.com there's a plethora of bots of different ratings, but outside a few gimmicks (e.g. "Nelson" always gets his queen out early) they're all the same, only differing in how frequently they blunder in-between perfect moves.