RetroChessBench: A Benchmark for Reconstructing and Proving Chess Histories
arXiv:2610.39341v1 Announce Type: cross Abstract: Frontier language models such as GPT 6 Astra have contributed to research mathematics, demonstrating substantial reasoning capabilities. Yet serious reasoning failures persist even in tasks governed by explicit rules. We demonstrate this in retrograde chess which is a playground for pure reasoning, where solvers reconstruct legal histories and distinguish possible events from forced ones. We introduce RetroChessBench, a 12-task benchmark coverin…