Resolution Criteria: The market resolves "Yes" if a large language model (LLM), such as GPT, defeats a super grandmaster in an official chess match by December 31, 2028. The match must be recognized by credible chess organizations (e.g., FIDE) or confirmed through reputable sources (e.g., Reuters, Chess.com). If no such match or victory occurs by the deadline, the market resolves "No." Resolution Date & Time: December 31, 2028, at 23:59 PST.