[aaylward]

#1668 phase 3.

• Go opts into kRoundRobins: createRoundRobin (entrants + GoStartGame terms, refused when no game could open on them), and chess's withdraw, forfeit, roundRobins and playRoundRobin shapes.
• A pairing's table waits on the round robin's terms (go takes challenges), starts when the opponent sits, and opens with the pairing's Black on move: go::Table::open takes a black_seat.
• Its one game, off the table's own score sheet as pong's is, decides the pairing: winner, or a draw on an even count. Results are scored by the existing rules.
• Wire: GoRoundRobin is chess's round robin with go's terms. It reuses ChessPairing and ChessStanding, and chess's view builder now serves both. GoView.roundRobinId names a pairing's table.
• Stored body: {"game":"go","terms":{"size","komi","initialMs","incrementMs"},...}, pinned both ways beside chess's and pong's.

Rollback: a pre-change binary skips stored go round robins (logged, untouched, back on roll-forward). Their waiting pairing tables lose the pair gate and the pairing's colours until then.

Tests: go_round_robin_e2e_test, written first:

• create, and refuse bad terms;
• a pairing's table starts on the round robin's terms with its Black, and scores a resignation;
• an even count draws for half a point each;
• leaving a pairing's game loses it;
• forfeit and withdraw;
• one game per table;
• go's envelope refuses a chess round robin.

Also: engine black_seat, body round trip and refusals, the stored-body pin, the wire builder. //domains/games/... green with Postgres. scripts/mutation-check kills the pairing's Black, the terms check, the terms the table starts on, TableGame, the body read, forfeit and withdraw.

Review panel ran; fixups in f2f886c (forfeit/withdraw/leave tests, docs that named only chess and pong). Not taken: sharing the three adapters' near-identical round-robin decode and event hooks, until a fourth game has round robins.

UI follows in muchq/muchq.github.io once muchq/muchq.github.io#461 merges.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xae1QBa2qHX32DPVGSq19F

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	iili	82f562c	Commit Preview URL Branch Preview URL	Oct 19 2026, 09:03 PM

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	ast-lol	82f562c	Commit Preview URL Branch Preview URL	Oct 19 2026, 09:03 PM

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	1d4-web	82f562c	Commit Preview URL Branch Preview URL	Oct 19 2026, 09:02 PM

[cursor]

Review: f2f886c5

Verdict: Approve

Phase 3 of #1668: go opts into kRoundRobins on chess's rules and pong's table-game scoring path. Tip includes the panel fixup (forfeit/withdraw/leave e2e, docs that now name go).

What lands

• kRoundRobins + create/withdraw/forfeit/roundRobins/playRoundRobin on go's envelope; bad terms refused via go::CheckRules at create, same gate as challenges.
• Pairing tables wait on the RR's terms (RoundRobinStart from table_terms, chess's pattern), open with the pairing's Black (Table::open(..., black_seat)), play one game, score off the sheet (TableGame → empty winner is draw).
• Wire: GoRoundRobin shares chess pairings/standings via ColouredRoundRobinOf; body {"game":"go","terms":{...}} pinned both ways; each envelope still refuses another game's RR.
• Engine: black_seat default 0 keeps non-RR opens; next game still swaps.

Checked

• Open finds Black from pairing->black in roster; invalid seat fails CheckSetup (0|1). View lists Black first by color, so the e2e colour asserts bite.
• Draw path: even area score → sheet winner absent → EventGame.winnernullopt → EffectivePairings draw / 0.5 — covered by AnEvenCountDrawsThePairing.
• Leave / forfeit / withdraw / one-game refusal / chess-RR cross-envelope refusal covered in go_round_robin_e2e_test (fixup).
• Stored-body pin and RoundRobinBody round-trip / refusal of size 10 sit beside chess and pong.
• Rollback note matches the named-body skip pattern.

Not blocking

• Sharing the three adapters' near-identical RR decode/event hooks — agreed, wait for a fourth.

CI already green on this tip (24/24, sanitizers included). Approve.

[cursor]

Review: 82f562cf

Verdict: Approve (unchanged)

Takes the deferred share: RoundRobinMove for withdraw/forfeit/roundRobins/playRoundRobin, and RoundRobinWire + shared wrap in adapters.cc for the list/single events. createRoundRobin stays per-game (terms). Concept and EveryRoundRobinGameDecodesTheSharedMovesAlike pin all three.

Net deletion, behaviour unchanged. Waiting on CI for this tip.

[cursor]

CI: 82f562cf

All 24 checks green (build-and-test, asan, ubsan, tsan included). Approve unchanged.