Add video evidence windows; revise one prompt

README.md

@@ -66,6 +66,12 @@ tasks, 522 survived (15.1%).
 | `golden_response` | string | Human-written reference answer |
 | `rubric_criteria` | list of `{id, title}` | Criteria a correct answer must satisfy |
 | `num_criteria` | int | `len(rubric_criteria)` |
+| `evidence_start`, `evidence_end` | string or null | Video tasks: the part of the clip that holds the evidence for the answer, as `m:ss` timestamps. Null for image tasks |
+| `evidence_start_sec`, `evidence_end_sec` | float or null | The same window in seconds |
+
+Models are evaluated on the **whole** video; the evidence window is metadata
+for analysis (for example, how much of a clip a model needs to see), not part
+of the input.
 
 ## Loading
 
@@ -89,6 +95,15 @@ criteria survived curation, **a task counts as correct only if every one of its
 criteria is met**. The headline metric is accuracy over the 522 tasks. In the
 paper the judge is Claude Opus 5.
 
+## Updates
+
+- **2026-10-08**: added the video evidence window (`evidence_start`,
+  `evidence_end` and their `_sec` versions) for all 234 video tasks. Revised
+  the prompt of task `6a7f82ad5cfeb63114fa869b` (the people in the scene are
+  now described as two women and a man). Some reference answers were reformatted with
+  line breaks; their wording is unchanged. Tasks, media, rubrics and splits are
+  otherwise identical to the initial release.
+
 ## Notes and limitations
 
 - **Contamination.** The media comes from the public web and may appear in