Both agree DRAW → one rematch on the same slot (new child match, short check-in) only if it fits remaining play_end_at. UI shows REMATCH, not COMPLETED.
Draw vs win with two proofs → dual-proof dispute. Lone DRAW + silent opponent → do not auto-finalize a draw.
Rematch drawn or no time: no third match. Lower seed number advances (seeds locked at start). Not host pick, not a live coin-flip.