{"id":812,"date":"2026-08-05T09:43:23","date_gmt":"2026-08-05T09:43:23","guid":{"rendered":"https:\/\/gammonrants.org\/?page_id=812"},"modified":"2026-08-05T12:38:45","modified_gmt":"2026-08-05T12:38:45","slug":"opengammons-hedgehog-is-a-free-world-class-backgammon","status":"publish","type":"page","link":"https:\/\/gammonrants.org\/index.php\/opengammons-hedgehog-is-a-free-world-class-backgammon\/","title":{"rendered":"OpenGammon&#8217;s Hedgehog is a free world-class backgammon"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Okay, we live in times of SEO and Influencers and such, so: <strong>OMG THERE IS A NEW BACKGAMMON APP AND IT IS FREE AND IT PLAYS ON WORLD CHAMP LEVEL OMG!<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That said, let&#8217;s take a thorough look.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recently, OpenGammon has released <a href=\"https:\/\/hedgehog-bg.com\" title=\"\">Hedgehog<\/a>, a web app that you can use to play against several of their new Backgammon engines. The app supports analysis by what they claim to be the strongest engine on this planet, even outperforming Extreme Gammon 2 slightly, and a full backgammon playing experience against several smaller engines that run locally in your browser.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"736\" src=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.13.25-1024x736.png\" alt=\"\" class=\"wp-image-813\" style=\"width:563px;height:auto\" srcset=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.13.25-1024x736.png 1024w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.13.25-300x216.png 300w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.13.25-768x552.png 768w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.13.25-1536x1104.png 1536w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.13.25-2048x1472.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">The default screen with Tutor enabled<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The web app is beautifully designed (feels a bit vibe coded but that&#8217;s not a bad thing), and has every feature I am used from pro apps like XG2:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It plays money games and matches to n points<\/li>\n\n\n\n<li>It has three levels of hint system during playing (none, hint, tutor) &#8211; in the screenshot above you see a hint<\/li>\n\n\n\n<li>It features an extensive analysis feature<\/li>\n\n\n\n<li>It offers half a dozen different color schemes<\/li>\n\n\n\n<li>Its match database gives you an overview of your past matches (limited to 10 in the free tier)<\/li>\n\n\n\n<li>It can also study (set up a position) and transcribe matches (haven&#8217;t tried these)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">But best of all, it features an AI that plays on world champion level.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The AIs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Actually it features a confusing amount of AIs: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Four (!) client-side AIs that will run in your browser. With this requirement they cannot be insanely powerful. <\/li>\n\n\n\n<li>A server-side AI that they claim plays even stronger than &#8220;Extreme Gammon 2&#8221; which is the benchmark all others are often measured against, a superhuman AI that makes nearly no mistakes. <br>But you can use this one only for analysis, and if you&#8217;re in the free tier, only a very limited number of them.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">I must say I was very confused by these AIs. In your settings you can select from this list.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Default (Small) 1.0<\/li>\n\n\n\n<li>Aureus V.01<\/li>\n\n\n\n<li>Fox V0.3<\/li>\n\n\n\n<li>Fox V0.32<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Now as Default is obviously the weakest (small) one, and obviously Fox 0.32 is a successor to Fox 0.3 I was assuming that the list is sorted by playing strength. Turns out it is not. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By now I had BGBlitz analyse 63 games in matches to 3, 5, 7, 9 points. I&#8217;m not ready for a final conclusion, but so far Aureus plays consistently at at least world class level, with an average of PR 1.9, which is better than every human player. Fox 0.32, on the other side, pulls off an occasional blunder and ends at PR 5.9, a rating on expert level, but not something a strong backgammon player can trust for analysis advice. The other two models need more testing. Will update this review as I know more.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So: <strong>Pick Aureus<\/strong>, be happy with an opponent and a trainer that plays as good or better as the strongest human. In my &#8220;<a href=\"https:\/\/gammonrants.org\/index.php\/how-strong-is-that-backgammon-app-the-mighty-table\/\" title=\"How strong is that backgammon app? The mighty table\">mighty table<\/a>&#8221; of the best bots, Aureus reached 3rd place.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tutor and Analysis<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"752\" src=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.14.03-1024x752.png\" alt=\"\" class=\"wp-image-814\" style=\"aspect-ratio:1.3614486664716674;width:626px;height:auto\" srcset=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.14.03-1024x752.png 1024w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.14.03-300x220.png 300w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.14.03-768x564.png 768w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.14.03-1536x1128.png 1536w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.14.03-2048x1504.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">The analysis in action<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">My favourite feature (apart from a free World Champ AI) of Hedgehog are its tutor and analysis which are even better than the best I know (XG2, BGBlitz). The tutor first gives you a small hint, in human-readable language (not: play bar\/24 13\/9* like all the others but &#8220;Hit on the 9-point&#8221;), and, if you wish, shows you the full stats &#8211; equity losses, win\/gammon\/bg probabilities. Awesome stuff.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">My only gripe is that the hint is shown before you move. I would prefer a post-move hint with an undo, like most apps do it. The thing is, in Backgammon you make a move, examine the position, undo the move, try a different one, etc, until you are sure this is the right move, and only then &#8220;commit&#8221; to the move. If I am trying out a first move and immediately get a &#8220;You should do that&#8221; hint, it is actually disturbing my thought process and not helping.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"585\" src=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-11.31.26-1024x585.png\" alt=\"\" class=\"wp-image-815\" style=\"aspect-ratio:1.7513254660509663;width:639px;height:auto\" srcset=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-11.31.26-1024x585.png 1024w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-11.31.26-300x171.png 300w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-11.31.26-768x439.png 768w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-11.31.26-1536x877.png 1536w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-11.31.26-2048x1169.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">The full analysis <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The analysis screen uses the same approach. Note the toggle buttons in the top left area that allows you to filter for all moves, all kinds of errors, or blunders only. VERY convenient as a way to briefly examine your blunders after a match.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mobile<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The app&#8217;s UI is nicely &#8220;responsive&#8221; and looks nice on computers, tablets, phones.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"469\" height=\"1024\" src=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.19.38-469x1024.png\" alt=\"\" class=\"wp-image-816\" style=\"width:289px;height:auto\" srcset=\"https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.19.38-469x1024.png 469w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.19.38-138x300.png 138w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.19.38-768x1675.png 768w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.19.38-704x1536.png 704w, https:\/\/gammonrants.org\/wp-content\/uploads\/2026\/08\/Bildschirmfoto-2026-08-05-um-10.19.38.png 772w\" sizes=\"auto, (max-width: 469px) 100vw, 469px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Paid tiers<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While the free features are enough for most of us, there are paid tiers with more features, for the pros or the wealthy. For \u20ac60 a year you get a bunch of additional features, including more analysis, more match storage, an unknown number of additional AIs of unknown strength; for twice the price &#8211; \u20ac120 a year, you get even more mysteriously strong AIs and more.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is EXPENSIVE. Long long ago backgammon software was pricy, Jellyfish Tutor was expensive, Snowie even more. Then came backgammon apps that were much cheaper (XG costs \u20ac60 &#8211; once, BGBlitz a bit less &#8211; once) or free (Gnu, clumsy UI, but as strong as the others and free), and then came apps like XG Mobile or True Backgammon that give you nearly the same features (no rollout though) for about 10 bucks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is beyond me why opengammon expects people to pay 60 euros every year for their app. But you don&#8217;t have to.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The free tier of Hedgehog currently is by far the strongest and most complete free backgammon app available. It&#8217;s total fun to play it, and it can help you become a stronger player. And if you want, you can get more features for a lot of money.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Okay, we live in times of SEO and Influencers and such, so: OMG THERE IS A NEW BACKGAMMON APP AND IT IS FREE AND IT PLAYS ON WORLD CHAMP LEVEL OMG! That said, let&#8217;s take a thorough look. Recently, OpenGammon has released Hedgehog, a web app that you can use to play against several of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":813,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"class_list":["post-812","page","type-page","status-publish","has-post-thumbnail","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Okay, we live in times of SEO and Influencers and such, so: OMG THERE IS A NEW BACKGAMMON APP AND IT IS FREE AND IT PLAYS ON WORLD CHAMP LEVEL OMG! That said, let&#039;s take a thorough look. 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