{"id":3033,"date":"2026-04-08T00:05:05","date_gmt":"2026-04-08T00:05:05","guid":{"rendered":"http:\/\/www.robertandrews.org\/LIFE\/?p=3033"},"modified":"2026-04-25T17:24:13","modified_gmt":"2026-04-25T17:24:13","slug":"13-card-trick","status":"publish","type":"post","link":"http:\/\/www.robertandrews.org\/LIFE\/13-card-trick\/","title":{"rendered":"13 Card Trick"},"content":{"rendered":"<h1><strong>The &#8220;Thirteen&#8221; card trick.<\/strong><\/h1>\n<p><a href=\"http:\/\/www.robertandrews.org\/LIFE\/card-tricks\/\">RETURN TO CARD TRICK MENU<\/a><\/p>\n<hr \/>\n<input type='hidden' bg_collapse_expand='6a25f6edceb682016723097' value='6a25f6edceb682016723097'><input type='hidden' id='bg-show-more-text-6a25f6edceb682016723097' value='* PERFORMER SECRET'><input type='hidden' id='bg-show-less-text-6a25f6edceb682016723097' value='Show Less'><button id='bg-showmore-action-6a25f6edceb682016723097' class='bg-showmore-plg-button bg-orange-button  '   style=\" color:#4a4949;\">* PERFORMER SECRET<\/button><div id='bg-showmore-hidden-6a25f6edceb682016723097' ><\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">How the Performer Knows the Prediction<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The performer secretly <strong>peeks at the bottom card of the original 39-card portion<\/strong> before placing the 10 cards beneath it. That card is mathematically guaranteed to always be the one revealed. The peek can happen naturally while &#8220;casually&#8221; squaring up the deck.<\/p>\n<p><\/div>\n<ol>\n<li>Shuffle &amp; mix the cards from a deck without the Jokers.<\/li>\n<li>Count out 13 cards<\/li>\n<li>Mix them up<\/li>\n<li>Have The Mark selects three cards and place face up<\/li>\n<li>(eg) 2, 8, 10<\/li>\n<li>* Take remaning 10 cards and put them on the bottom of the deck<\/li>\n<li>Add value of cards to each &#8211; face down\n<ul>\n<li>2 gets 11 cards<\/li>\n<li>8 gets 5 cards<\/li>\n<li>10 gets 3 cards<\/li>\n<li>Face cards get 3 cards<\/li>\n<\/ul>\n<\/li>\n<li>Add up the face value of the cards 2+8+10 = 20<\/li>\n<li>Deal face down that many cards\n<ol>\n<li>1, 2, 3&#8230;. 19, 20<\/li>\n<\/ol>\n<\/li>\n<li>Hold your hand over the face down cards, and &#8220;guess&#8221; the top card.<\/li>\n<li>Turn over the top card (eg) K diamonds<\/li>\n<li>Prediction matches the card turned over<\/li>\n<\/ol>\n<input type='hidden' bg_collapse_expand='6a25f6edcec3d0042058214' value='6a25f6edcec3d0042058214'><input type='hidden' id='bg-show-more-text-6a25f6edcec3d0042058214' value='The Trick'><input type='hidden' id='bg-show-less-text-6a25f6edcec3d0042058214' value='Show Less'><button id='bg-showmore-action-6a25f6edcec3d0042058214' class='bg-showmore-plg-button bg-orange-button  '   style=\" color:#4a4949;\">The Trick<\/button><div id='bg-showmore-hidden-6a25f6edcec3d0042058214' >\n<ul>\n<li>At the start of the cards, after shuffling and mixing, glance at the bottom card.<\/li>\n<li>Count out 13 cards, etc &#8211; Steps 2, 3, 4, 5, 6 are just diversions<\/li>\n<li>The card turned over is what you &#8220;peeked&#8221; and wrote down.<\/li>\n<\/ul>\n<p><\/div><input type='hidden' bg_collapse_expand='6a25f6edcec806072273609' value='6a25f6edcec806072273609'><input type='hidden' id='bg-show-more-text-6a25f6edcec806072273609' value='Claude&#039;s Analysis'><input type='hidden' id='bg-show-less-text-6a25f6edcec806072273609' value='Show Less'><button id='bg-showmore-action-6a25f6edcec806072273609' class='bg-showmore-plg-button bg-orange-button  '   style=\" color:#4a4949;\">Claude&#039;s Analysis<\/button><div id='bg-showmore-hidden-6a25f6edcec806072273609' ><\/p>\n<h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\">The Core Mechanic<\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">It&#8217;s pure algebra that <strong>always cancels to the same result<\/strong>, regardless of which cards are chosen.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">The Setup Math<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">After pulling 13 cards and the mark picks 3 (values <strong>a<\/strong>, <strong>b<\/strong>, <strong>c<\/strong>), the 10 unchosen cards go to the bottom of the deck. Working deck is now <strong>49 cards<\/strong>.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">The Cancellation<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Each chosen card gets cards dealt on top of it to <strong>complete 13<\/strong>:<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"whitespace-normal break-words pl-2\">Card showing <em>a<\/em> \u2192 gets <strong>(13\u2212a)<\/strong> cards<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Card showing <em>b<\/em> \u2192 gets <strong>(13\u2212b)<\/strong> cards<\/li>\n<li class=\"whitespace-normal break-words pl-2\">Card showing <em>c<\/em> \u2192 gets <strong>(13\u2212c)<\/strong> cards<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Cards consumed by the piles:<\/p>\n<blockquote class=\"ml-2 border-l-4 border-border-300\/10 pl-4 text-text-300\">\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">(13\u2212a) + (13\u2212b) + (13\u2212c) = <strong>39 \u2212 (a+b+c)<\/strong><\/p>\n<\/blockquote>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Then you deal <strong>(a+b+c)<\/strong> more cards face down.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>Total cards consumed from the working deck:<\/strong><\/p>\n<blockquote class=\"ml-2 border-l-4 border-border-300\/10 pl-4 text-text-300\">\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">[39 \u2212 (a+b+c)] + (a+b+c) = <strong>39 exactly \u2014 always<\/strong><\/p>\n<\/blockquote>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">The Result<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The 49-card working deck always has <strong>39 cards consumed<\/strong> and <strong>10 left over<\/strong> \u2014 the same 10 that were placed at the bottom. The revealed card is always the <strong>card sitting just above those 10<\/strong>, i.e., position 40 from the bottom of the working deck.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The (a+b+c) terms <strong>cancel out completely<\/strong>. It doesn&#8217;t matter if the mark picks 2-8-10 or 5-5-5 or any other combination \u2014 the math lands on the same card every time.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\">How the Performer Knows the Prediction<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The performer secretly <strong>peeks at the bottom card of the original 39-card portion<\/strong> before placing the 10 cards beneath it. That card is mathematically guaranteed to always be the one revealed. The peek can happen naturally while &#8220;casually&#8221; squaring up the deck.<\/p>\n<p><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The &#8220;Thirteen&#8221; card trick. RETURN TO CARD TRICK MENU Shuffle &amp; mix the cards from a deck without the Jokers. Count out 13 cards Mix them up Have The Mark selects three cards and place face up (eg) 2, 8, 10 * Take remaning 10 cards and put them on [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-3033","post","type-post","status-publish","format-standard","hentry","category-entertainment"],"_links":{"self":[{"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/posts\/3033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/comments?post=3033"}],"version-history":[{"count":9,"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/posts\/3033\/revisions"}],"predecessor-version":[{"id":3528,"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/posts\/3033\/revisions\/3528"}],"wp:attachment":[{"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/media?parent=3033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/categories?post=3033"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.robertandrews.org\/LIFE\/wp-json\/wp\/v2\/tags?post=3033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}