Live games lost their move history (each opponent move arrived as a bare
FEN), so threefold repetition never triggered and the PGN broke; moves now
replay from the server's list. The mating move was sent after the game
closed and never reached the opponent. A refreshed tab overwrote the
server's move list with a short one; it now rebuilds from the server.
The opponent got the increment twice, Black's clock started before the
first move, and a flag is now confirmed with the server. Refreshing a bot
game lost it; the bot accepted half of all draw offers at random and froze
on an illegal reply. Promotion has a cancellable picker. The result card
no longer invents rating changes for bot games, rematch after a live game
searches at the same clock, and back to table no longer stacks a home.
Analysis kept the evaluation sign and orientation for Black; review runs
one engine call per position and caches. Puzzles accept an alternative
mate and offer retry / show answer.

Board: flat lavender in an ink frame, pieces on a lip, tokens only.
tests/play/chess.mjs: 183/183 (bot, online with two accounts, puzzles,
three phone sizes), zero console errors.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>