(function () { var ok = false; try { ok = !!(window.CSS && window.CSS.registerProperty) || !!new Function("return /(?<=a)b/")(); } catch (e) { ok = false; } if (ok) return; function paint() { if (document.getElementById("koc-unsupported")) return; var el = document.createElement("div"); el.id = "koc-unsupported"; el.setAttribute( "style", "position:fixed;top:0;left:0;right:0;bottom:0;z-index:2147483647;" + "background:#ffffff;color:#111111;overflow:auto;" + "-webkit-overflow-scrolling:touch;" + "font-family:-apple-system,BlinkMacSystemFont,Helvetica,Arial,sans-serif;" ); el.innerHTML = '

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This device is too old to run Kingdom of Chess

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Its browser is older than this site supports. That is why the page loads normally but the Login button does nothing.

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Please use the phone or laptop you already use for your classes. Everything works there, with the same login.

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Any of these will work:

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iPhone or iPad on iOS 16.4 or newer
Mac on Safari 16.4 or newer
Windows, Android or Chromebook on Chrome or Edge 111 or newer
Firefox 128 or newer

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All of those versions came out in 2023 or 2024, so most devices bought in the last few years are fine.

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If this device offers a software update, installing it may fix the problem: Settings → General → Software Update. iPads from 2015 and earlier cannot be updated far enough.

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Still stuck? Contact your coach or the Kingdom of Chess team and we will help you get set up.

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"; document.body.appendChild(el); } if (document.readyState === "loading") { document.addEventListener("DOMContentLoaded", paint); } else { paint(); } })();

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