const { useState, useEffect, useMemo } = React; // ---------- Go board ---------- function GoBoard({ size = 19, stones, showCoords = true }) { const N = size; // generate grid lines via SVG const pad = 5; // % padding inside SVG viewBox const cell = (100 - pad * 2) / (N - 1); const lines = []; for (let i = 0; i < N; i++) { const p = pad + i * cell; lines.push(); lines.push(); } // star points (hoshi) for 19x19 const stars = N === 19 ? [3, 9, 15] : N === 13 ? [3, 6, 9] : [2, 4, 6]; const hoshi = []; for (const a of stars) for (const b of stars) { hoshi.push(); } const coordsX = "ABCDEFGHJKLMNOPQRST".slice(0, N).split(""); return (
{showCoords && ( <>
{coordsX.map(c => {c})}
{coordsX.map(c => {c})}
{Array.from({ length: N }, (_, i) => {i + 1})}
{Array.from({ length: N }, (_, i) => {i + 1})}
)}
{lines} {hoshi} {stones.map((s, i) => { const x = pad + s.x * cell; const y = pad + (N - 1 - s.y) * cell; const r = cell * 0.46; return (
); })}
); } // Generate a dense, plausible-looking endgame stone layout function generateStones() { const stones = []; const seed = (n) => { let s = n; return () => { s = (s * 9301 + 49297) % 233280; return s / 233280; }; }; const rand = seed(42); const placed = new Set(); const place = (x, y, c) => { const k = `${x},${y}`; if (placed.has(k)) return; if (x < 0 || x > 18 || y < 0 || y > 18) return; placed.add(k); stones.push({ x, y, c }); }; // Build clusters in 4 corners + center fight const clusters = [ { cx: 3, cy: 15, r: 4, density: 0.55 }, { cx: 15, cy: 15, r: 5, density: 0.6 }, { cx: 4, cy: 3, r: 4, density: 0.5 }, { cx: 15, cy: 4, r: 5, density: 0.55 }, { cx: 9, cy: 9, r: 4, density: 0.45 }, { cx: 12, cy: 10, r: 3, density: 0.5 }, ]; clusters.forEach((cl, idx) => { for (let dx = -cl.r; dx <= cl.r; dx++) { for (let dy = -cl.r; dy <= cl.r; dy++) { const x = cl.cx + dx, y = cl.cy + dy; if (Math.abs(dx) + Math.abs(dy) > cl.r + 1) continue; if (rand() < cl.density) { const c = rand() < 0.5 ? "b" : "w"; place(x, y, c); } } } }); // Add a few isolated stones for (let i = 0; i < 12; i++) { place(Math.floor(rand() * 19), Math.floor(rand() * 19), rand() < 0.5 ? "b" : "w"); } return stones; } // ---------- Icons ---------- const BrandMark = (props) => ( ); const Icon = { Arrow: (p) => , Play: (p) => , Bolt: (p) => , Trophy: (p) => , Eye: (p) => , Book: (p) => , Users: (p) => , Send: (p) => , Skip: (dir, p) => {dir === "back" ? <> : <>}, StepBack: (p) => , StepFwd: (p) => , Reset: (p) => , Bars: (p) => , Grid: (p) => , List: (p) => , Chat: (p) => , Twitter: (p) => , Discord: (p) => , Youtube: (p) => , Github: (p) => , }; // ---------- Game Room mock ---------- function GameRoom({ showCoords }) { const stones = useMemo(() => generateStones(), []); return (
Game Room
Board
Move List
Chat
{/* Left side */}
HanaKim
3d
1857
28:47
2 × 30 sec
Captured
5
2
ZenMaster
3d
1874
24:13
2 × 30 sec
{/* Board */} {/* Right side */}
#BlackWhite
{[ ["121", "Q4", "D4"], ["122", "R4", "C4"], ["123", "P3", "D3"], ["124", "O3", "D2"], ["125", "Q3", "C3"], ["126", "R3", "P16"], ["127", "N17", "C16"], ["128", "Q16", "D16"], ["129", "P17", "E16"], ["130", "R17", "F16"], ["131", "Q17", "Pass"], ].map((r, i) => (
{r[0]}{r[1]}{r[2]}
))}
Black to play
HanaKim
Great move!
10:21
ZenMaster
Thank you!
10:22
HanaKim
This is getting exciting.
10:23
Say something…
{/* Bottom controls */}
Live
); } // ---------- Page ---------- function Page() { const [t, setTweak] = useTweaks(window.TWEAKS_DEFAULTS || { accentHue: 70, headlineWeight: 500, showBoardCoords: true }); return (
{/* NAV */} {/* HERO */}

A beautiful place
to play Go online.

Play live or by correspondence. Compete in ranked games and tournaments. Review, learn, and connect with the global Go community.

Niwa Game Room
{/* TWEAKS PANEL */} setTweak("headlineWeight", v)} /> setTweak("showBoardCoords", v)} />
); } // expose tweak defaults globally so script-tag order is robust window.TWEAKS_DEFAULTS = { accentHue: 70, headlineWeight: 500, showBoardCoords: true }; ReactDOM.createRoot(document.getElementById("root")).render();