2019 Adversarial Collaboration Winners

The 2019 Adversarial Collaboration Contest results, plus a substantive retrospective. Winner: 'Does Calorie Restriction Slow Aging?' (Liberman & Reese); a near-tie second, 'Is Eating Meat A Net Harm?' (David G & Froolow), which visibly changed many readers' diets (quoted comments). The genuinely useful meta-commentary: ACCs work best when focused on a FACTUAL question where the disagreement is really about evidence (calorie restriction); they falter where the real disagreement is moral (circumcision, abortion). He raises the good-faith-convergence-vs-one-collaborator-slacked-off problem, comments on each entry (circumcision, space colonization, gene editing, abortion, automation, and the spiritual-experience ACC = the catalogued SSC-841), deliberately counters the negativity bias of comment sections by foregrounding positive votes, divides the prize money, and — notably — announces he'll retire the format and replace it with a book-review contest (the seed of the later ACX Book Review Contest).

Quality 58 · Solid. Solid, high (58). Primarily a contest-results announcement, but lifted above a bare stub by genuinely useful meta-commentary on what makes adversarial collaboration work (the 'focus on a factual question' insight; the convergence-vs-slacking problem) and by foreshadowing the book-review contest.

Claude’s paradigm shift 42 · Moderate. Moderate, low (42). An announcement/retrospective; the 'factual-question ACCs work best' observation is a fresh but modest meta-point.

Real-world impact 3 · Moderate. Moderate (3). Part of the durable, influential adversarial-collaboration format on SSC/ACX, and it announces the pivot to the book-review contest that became a major recurring ACX institution.