[DevomB]

Summary

Rebuilds the landing page around the real engine: visitors can now play Gofer in the browser, and the hero replays a real win over GNU Go instead of a 19×19 human game from 1846. Stacked on #1 (base: v3-engine-rewrite-and-selfplay-training).

Changes

Play the real engine in the browser

• cmd/gofer-wasm: the rules and MCTS search compiled to WebAssembly (2.6 MB, 0.77 MB gzipped). Network evaluations go through an async JS callback to onnxruntime-web 1.26.0 (pinned, from jsDelivr), so the browser runs the same search and the same gofer-9x9.onnx as bin/gofer.
• web/engine.js loads the runtime, network and engine only when someone presses Play (~5 MB once). In headless Chromium a 400-visit move takes ~2 s single-threaded.
• Play mode: choose a color, strength (100 / 400 / 1600 visits), pass, undo, new game; live candidate moves and a win-rate bar while Gofer thinks; final score under area scoring.

Hero, content and assets

• Watch mode replays a real game from the evaluation: GNU Go 3.8 level 10 (Black) vs Gofer at 400 visits, W+12.5.
• Elo-by-generation chart (inline SVG drawn at the container's pixel width, so labels stay legible on phones).
• Regenerated og-image.png from that game's final position (the old one advertised v2's arena gate and line counts).
• Mobile fixes: eyebrow and board labels no longer wrap or truncate badly; the hero no longer shifts when switching tabs.

Production build

• Tailwind is compiled at build time (make site → web/site.css, 23 KB) instead of the runtime play CDN; scripts moved to web/site.js / web/engine.js; index.html 85 KB → 54 KB.
• Build outputs (web/site.css, web/engine/*) are committed so Vercel (or any static host) serves web/ with no build step.
• CI vets and builds the WebAssembly engine.

Engine

• Search.PassWins: after the opponent passes, GTP, arena, terminal play and the browser engine pass immediately when passing already wins on the area count, instead of filling their own territory first.

Test plan

• go test ./..., go vet (pure Go, -tags onnx, GOOS=js GOARCH=wasm), pytest
• Headless Chromium against a local server (onnxruntime-web served from the pinned npm package): replay autoplays; Play as Black (E5 → Gofer replies, win bar updates, occupied point rejected, undo); Play as White (Gofer opens, pass → Gofer passes → "Gofer wins B+73.5"); "new" and tab switching; no page errors
• Desktop (1366 px) and phone (390 px) full-page screenshots; no horizontal scroll
• Check the Vercel preview on a real phone and desktop browser (fonts and jsDelivr were blocked in the build sandbox)

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Generated by Claude Code

[vercel]

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Project	Deployment	Actions	Updated
gofer	Ready	Preview	Oct 23, 2026 3:47pm UTC