Date selected to be approximately one year from prediction statement, and approximately two years from this paper: https://huggingface.co/papers/2402.04494

1800 elo selected as the approximated elo for GPT-3.5-Turbo-Instruct, rounded up to the nearest 100 elo points.

Lines defines as any series of moves that when viewed collectively could easily be explained to a human observer through human understandable heuretics, material exchanges, centipawn differences, or predicted win rates.

Elo requirement necessary so that explanation of potential lines is not alone sufficient, they must be competitive. For sake of rigor, the model must be able to provide three potential lines, if that many exist for the given position, within a single prompt without any further conversation turns, messages, or prompts from a human user.