{"id":36487,"date":"2026-09-16T00:00:31","date_gmt":"2026-09-16T07:00:31","guid":{"rendered":"https:\/\/www.gmpuzzles.com\/blog\/?p=36487"},"modified":"2026-09-14T18:43:57","modified_gmt":"2026-09-15T01:43:57","slug":"first-seen-odd-even-sudoku-by-clover-3","status":"publish","type":"post","link":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/","title":{"rendered":"First Seen Odd\/Even Sudoku by clover!"},"content":{"rendered":"<p>(This post is part of the <a href=\"https:\/\/www.gmpuzzles.com\/blog\/tag\/gas\/\">Genuinely Approachable Sudoku (GAS)<\/a> series.)<br \/>\n<em>In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns those clues generate?<\/em><\/p>\n<p align=\"center\"><img decoding=\"async\" src=\"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png\" alt=\"First Seen Odd\/Even Sudoku by clover!\" \/><\/p>\n<p align=\"center\"><a href=\"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.pdf\">PDF<\/a><\/p>\n<p>or <a href=\"https:\/\/www.gmpuzzles.com\/s\/260916Chec\">solve online<\/a> (using SudokuPad)<\/p>\n<p><b>Theme:<\/b> Checkerboard<\/p>\n<p><b>Author\/Opus:<\/b> This is the 178th puzzle from clover!, part of the Genuinely Approachable Sudoku (<a href=\"https:\/\/sudokutheory.com\/gas\/\">GAS<\/a>) team.<\/p>\n<p><b>Rules:<\/b> Standard <a href=\"https:\/\/www.gmpuzzles.com\/blog\/sudoku-rules-and-info\/\">Sudoku<\/a> rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). The clues outside the grid reveal the first odd or even value (or both) appearing in that direction in the row or column. Any number of values of the opposite parity (even or odd) may appear before the first odd or even number.<\/p>\n<p><b>GAS Time Standards (highlight to view):<\/b> Two party hats (\ud83c\udfa9\ud83e\udd73): <span style=\"color: white;background-color: white\">7:00<\/span>; One party hat (\ud83e\udd73): <span style=\"color: white;background-color: white\">13:00<\/span>. All other solvers earn a \ud83e\udd95: <span style=\"color: white;background-color: white\">two-tone Turiasaurus<\/span>.<\/p>\n<p><b>Thomas Hits the GAS (highlight to view):<\/b> <span style=\"color: white;background-color: white\">2:27<\/span>, with <a href=\"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/sudokupad-clover-September_16_2026_Checkerboard-a521-d148.replay\">SudokuPad replay file<\/a> shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).<\/p>\n<p><b>Solution:<\/b> <a href=\"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard-soln.pdf\">PDF<\/a><\/p>\n<p><b>Note:<\/b> Follow this link for other less common variations of <a href=\"https:\/\/www.gmpuzzles.com\/blog\/tag\/sudoku-3+variation-2\/\">Sudoku<\/a>.<\/p>\n<p><b>Note 2:<\/b>\u00a0Comments on the blog are great! For a more interactive discussion, please also consider using our\u00a0<a href=\"https:\/\/discord.com\/channels\/1059513302847336469\/1380897111599616020\">Daily GAS discussion<\/a>\u00a0post\u00a0on the GMPuzzles Discord. Not a member of the Discord? Click\u00a0<a href=\"https:\/\/discord.gg\/RNNfEBEbQS\">this link<\/a>\u00a0for basic access.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>(This post is part of the Genuinely Approachable Sudoku (GAS) series.) In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns those clues generate? PDF or solve online (using SudokuPad) Theme: Checkerboard Author\/Opus: This is the 178th puzzle from clover!, part of the Genuinely Approachable [&hellip;]<\/p>\n","protected":false},"author":444,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,126],"tags":[8,15,56,237],"class_list":["post-36487","post","type-post","status-publish","format-standard","hentry","category-puzzle","category-othersudoku","tag-sudoku-3","tag-wednesdaythursday","tag-variation-2","tag-gas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>First Seen Odd\/Even Sudoku by clover! - The Art of Puzzles<\/title>\n<meta name=\"description\" content=\"In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns from those clues?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"First Seen Odd\/Even Sudoku by clover! - The Art of Puzzles\" \/>\n<meta property=\"og:description\" content=\"In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns from those clues?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/\" \/>\n<meta property=\"og:site_name\" content=\"The Art of Puzzles\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-16T07:00:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png\" \/>\n<meta name=\"author\" content=\"Clover\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@drsudoku\" \/>\n<meta name=\"twitter:site\" content=\"@drsudoku\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Clover\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/\"},\"author\":{\"name\":\"Clover\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/#\\\/schema\\\/person\\\/18e8374ccaf31b1bfa1dc36c28c5c56d\"},\"headline\":\"First Seen Odd\\\/Even Sudoku by clover!\",\"datePublished\":\"2026-09-16T07:00:31+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/\"},\"wordCount\":234,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.gmpuzzles.com\\\/images\\\/puzzles2026\\\/260916-FirstSeenOddEvenSudoku-Checkerboard.png\",\"keywords\":[\"sudoku\",\"wed\\\/thurs\",\"variation\",\"gas\"],\"articleSection\":[\"Puzzle\",\"Other Sudoku\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/\",\"url\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/\",\"name\":\"First Seen Odd\\\/Even Sudoku by clover! - The Art of Puzzles\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.gmpuzzles.com\\\/images\\\/puzzles2026\\\/260916-FirstSeenOddEvenSudoku-Checkerboard.png\",\"datePublished\":\"2026-09-16T07:00:31+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/#\\\/schema\\\/person\\\/18e8374ccaf31b1bfa1dc36c28c5c56d\"},\"description\":\"In this First Seen Odd\\\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns from those clues?\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.gmpuzzles.com\\\/images\\\/puzzles2026\\\/260916-FirstSeenOddEvenSudoku-Checkerboard.png\",\"contentUrl\":\"https:\\\/\\\/www.gmpuzzles.com\\\/images\\\/puzzles2026\\\/260916-FirstSeenOddEvenSudoku-Checkerboard.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/2026\\\/09\\\/first-seen-odd-even-sudoku-by-clover-3\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"First Seen Odd\\\/Even Sudoku by clover!\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/\",\"name\":\"The Art of Puzzles\",\"description\":\"Grandmaster Puzzles\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/#\\\/schema\\\/person\\\/18e8374ccaf31b1bfa1dc36c28c5c56d\",\"name\":\"Clover\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f13415f99fbfe56782538f36a02829b51ec31e58312ac076d809c72d6d0e3ab4?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f13415f99fbfe56782538f36a02829b51ec31e58312ac076d809c72d6d0e3ab4?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f13415f99fbfe56782538f36a02829b51ec31e58312ac076d809c72d6d0e3ab4?s=96&d=mm&r=g\",\"caption\":\"Clover\"},\"url\":\"https:\\\/\\\/www.gmpuzzles.com\\\/blog\\\/author\\\/clover\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"First Seen Odd\/Even Sudoku by clover! - The Art of Puzzles","description":"In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns from those clues?","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/","og_locale":"en_US","og_type":"article","og_title":"First Seen Odd\/Even Sudoku by clover! - The Art of Puzzles","og_description":"In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns from those clues?","og_url":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/","og_site_name":"The Art of Puzzles","article_published_time":"2026-09-16T07:00:31+00:00","og_image":[{"url":"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png","type":"","width":"","height":""}],"author":"Clover","twitter_card":"summary_large_image","twitter_creator":"@drsudoku","twitter_site":"@drsudoku","twitter_misc":{"Written by":"Clover","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#article","isPartOf":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/"},"author":{"name":"Clover","@id":"https:\/\/www.gmpuzzles.com\/blog\/#\/schema\/person\/18e8374ccaf31b1bfa1dc36c28c5c56d"},"headline":"First Seen Odd\/Even Sudoku by clover!","datePublished":"2026-09-16T07:00:31+00:00","mainEntityOfPage":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/"},"wordCount":234,"commentCount":0,"image":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#primaryimage"},"thumbnailUrl":"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png","keywords":["sudoku","wed\/thurs","variation","gas"],"articleSection":["Puzzle","Other Sudoku"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/","url":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/","name":"First Seen Odd\/Even Sudoku by clover! - The Art of Puzzles","isPartOf":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#primaryimage"},"image":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#primaryimage"},"thumbnailUrl":"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png","datePublished":"2026-09-16T07:00:31+00:00","author":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/#\/schema\/person\/18e8374ccaf31b1bfa1dc36c28c5c56d"},"description":"In this First Seen Odd\/Even Sudoku, several clues outside the grid include two numbers. Can you spot any special patterns from those clues?","breadcrumb":{"@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#primaryimage","url":"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png","contentUrl":"https:\/\/www.gmpuzzles.com\/images\/puzzles2026\/260916-FirstSeenOddEvenSudoku-Checkerboard.png"},{"@type":"BreadcrumbList","@id":"https:\/\/www.gmpuzzles.com\/blog\/2026\/09\/first-seen-odd-even-sudoku-by-clover-3\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.gmpuzzles.com\/blog\/"},{"@type":"ListItem","position":2,"name":"First Seen Odd\/Even Sudoku by clover!"}]},{"@type":"WebSite","@id":"https:\/\/www.gmpuzzles.com\/blog\/#website","url":"https:\/\/www.gmpuzzles.com\/blog\/","name":"The Art of Puzzles","description":"Grandmaster Puzzles","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.gmpuzzles.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.gmpuzzles.com\/blog\/#\/schema\/person\/18e8374ccaf31b1bfa1dc36c28c5c56d","name":"Clover","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/f13415f99fbfe56782538f36a02829b51ec31e58312ac076d809c72d6d0e3ab4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/f13415f99fbfe56782538f36a02829b51ec31e58312ac076d809c72d6d0e3ab4?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/f13415f99fbfe56782538f36a02829b51ec31e58312ac076d809c72d6d0e3ab4?s=96&d=mm&r=g","caption":"Clover"},"url":"https:\/\/www.gmpuzzles.com\/blog\/author\/clover\/"}]}},"_links":{"self":[{"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/posts\/36487","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/users\/444"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/comments?post=36487"}],"version-history":[{"count":5,"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/posts\/36487\/revisions"}],"predecessor-version":[{"id":36493,"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/posts\/36487\/revisions\/36493"}],"wp:attachment":[{"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/media?parent=36487"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/categories?post=36487"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gmpuzzles.com\/blog\/wp-json\/wp\/v2\/tags?post=36487"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}