The Bug That Looked Like a Finding
For six weeks we believed we had discovered something real about mid-season performance. We had discovered an off-by-one error in a date comparison.
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The Week Everything Was Confidently Wrong
Our worst week was not a week of bad luck. Every rating failed for the same reason, which means it was a single mistake made many times.
Read articleWe Graded Ourselves Generously for Months
Nobody cheated. The grading logic contained several small, individually defensible choices that all happened to point the same direction.
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