{"format":"murdoku-puzzle/1","id":"lightson","version":1,"difficulty":"expert","level":9,"size":{"rows":16,"cols":16},"languages":["en","hu","de","fr","es","it","nl","pl","pt","ro","ca","cs","fi","vi","tr","el","ru","uk","ar","ko","ja","zh-Hans","zh-Hant"],"defaultLanguage":"en","title":"When the Lights Came On","tagline":"English country house · a Saturday night in 1926 · in the dark everyone changed places","author":"mathace","concept":"Murdoku – Manuel Garand (murdoku.com); unofficial fan-made case","created":"2026-10-05","story":"Saturday night at Larkmoor House: after dinner the host, the shipping magnate Verner, proposed a round of the parlour game “Murder in the Dark”, and the main switch was thrown. For a few minutes the whole house was pitch-black. Family, guests and staff groped their way from room to room, and nobody ended up where they had started – everybody had changed places with somebody else. Only Oscar, the hired pianist, took no part in the game and stayed exactly where he was. When the lights came on again, Verner sat dead in an armchair in the Library – and this time it was no game. Everyone can tell you where they were when the lights came on; but the murderer is whoever was alone with Verner before the dark.","rules":{"standard":["Every <b>row</b> and every <b>column</b> holds exactly <b>one person</b>. As soon as you place someone, cross out their whole row and column.","<b>“Beside”</b> = directly left, right, above or below, and <b>in the same area</b>. Squares with objects (the piano, the harps, the gramophone, the cabinets, the bookcases, the tables, the desks, the billiard table, the fireplaces, the floor lamps, the coat racks, the staircases, the sinks, the potted plants and the statues) cannot be occupied; the wooden chairs, the armchairs, the sofas and the carpets can. Two objects are the <b>same kind of thing</b> only when they are the same picture: the billiard table and a desk are not tables, an armchair is not a wooden chair. A <b>corner</b> of an area is a square of that area that borders the outside (another area or the edge of the board) on one horizontal and one vertical side."],"special":["<b>In the dark every suspect swapped places with exactly one other suspect; only the pianist stayed where he was.</b>","The board shows where everyone was <b>after the lights came on</b>, and so do the statements – except the sentences that begin with <i>“Before the dark”</i>.","<b>Before the dark the murderer was alone with the victim</b>: nobody else was in that area."]},"roleNames":{"family":"family","guest":"guest","staff":"staff","victim":"victim"},"personGroups":[{"id":"family","name":"The family","persons":["A","B","C","D","V"]},{"id":"guests","name":"The guests","persons":["E","F","G","H","I","J","K"]},{"id":"staff","name":"The staff","persons":["L","M","N","O"]}],"map":{"groups":[],"gaps":[],"areas":[{"id":"Library","cells":[[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7],[2,1],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7],[3,1],[3,2],[3,3],[3,4],[3,5],[3,6],[3,7],[4,1],[4,2],[4,3]],"fill":"#e6d7a8","pattern":"planks","labelAt":[3,5.5],"name":"Library"},{"id":"Study","cells":[[1,8],[1,9],[2,8],[2,9],[3,8],[3,9],[3,10],[4,8],[4,9],[4,10]],"fill":"#c9d8ea","pattern":"planks","labelAt":[4,9.5],"name":"Study"},{"id":"Music Room","cells":[[1,10],[1,11],[1,12],[1,13],[1,14],[1,15],[1,16],[2,10],[2,11],[2,12],[2,13],[2,14],[2,15],[2,16],[3,11],[3,12],[3,13],[3,14],[3,15],[3,16],[4,11],[4,12],[4,13],[4,14],[4,15],[4,16],[5,11],[5,12],[5,13],[5,14],[5,15],[5,16],[6,14],[6,15],[6,16],[7,14],[7,15],[7,16]],"fill":"#dccbe6","pattern":"planks","labelAt":[7,15],"name":"Music 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rx=\"11\" ry=\"2.4\" fill=\"#2b2b2b\" stroke=\"#111\" stroke-width=\".8\"/><circle cx=\"20\" cy=\"31\" r=\"1\" fill=\"#d7263d\"/><path d=\"M24 30 q2 -9 8 -12\" fill=\"none\" stroke=\"#b8902f\" stroke-width=\"2.2\" stroke-linecap=\"round\"/><path d=\"M30 20 L21 5 q9 -5 21 1 q2 8 -4 17 z\" fill=\"#e0b050\" stroke=\"#7a5a1a\" stroke-width=\"1.3\" stroke-linejoin=\"round\"/><path d=\"M30 20 L26 6 M30 20 L32 4.500 M30 20 L38 6.500\" stroke=\"#7a5a1a\" stroke-width=\".8\"/>"},"harp":{"occupiable":false,"name":"harp","icon":"<path d=\"M12 40 V10 q0 -6 8 -6 q14 0 16 20 q1 10 -8 16 z\" fill=\"#e6cfa8\" stroke=\"#8a6a3a\" stroke-width=\"2\"/><g stroke=\"#8a6a3a\" stroke-width=\"1\"><line x1=\"17\" y1=\"12\" x2=\"17\" y2=\"38\"/><line x1=\"21\" y1=\"12\" x2=\"21\" y2=\"38\"/><line x1=\"25\" y1=\"14\" x2=\"25\" y2=\"38\"/><line x1=\"29\" y1=\"18\" x2=\"29\" y2=\"38\"/></g>"},"lamp":{"occupiable":false,"name":"floor lamp","icon":"<circle cx=\"23\" cy=\"12\" r=\"9\" fill=\"#f7e9a8\" 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fill=\"#d1a675\"/>"}},"wallTypes":{},"objects":[{"cell":[1,2],"type":"bookcase"},{"cell":[1,4],"type":"lamp"},{"cell":[1,6],"type":"bookcase"},{"cell":[1,9],"type":"bookcase"},{"cell":[1,11],"type":"cabinet"},{"cell":[1,16],"type":"statue"},{"cell":[2,1],"type":"bookcase"},{"cell":[2,3],"type":"carpet"},{"cell":[2,5],"type":"armchair"},{"cell":[2,8],"type":"chair"},{"cell":[2,9],"type":"desk"},{"cell":[2,15],"type":"harp"},{"cell":[3,3],"type":"armchair"},{"cell":[3,4],"type":"table"},{"cell":[3,7],"type":"fireplace"},{"cell":[3,11],"type":"carpet"},{"cell":[3,13],"type":"piano"},{"cell":[4,2],"type":"bookcase"},{"cell":[4,7],"type":"lamp"},{"cell":[4,8],"type":"lamp"},{"cell":[4,12],"type":"chair"},{"cell":[4,14],"type":"carpet"},{"cell":[5,2],"type":"harp"},{"cell":[5,4],"type":"plant"},{"cell":[5,8],"type":"fireplace"},{"cell":[5,10],"type":"cabinet"},{"cell":[5,12],"type":"sofa"},{"cell":[5,13],"type":"sofa"},{"cell":[6,4],"type":"armchair"},{"cell":[6,8],"type":"armchair"},{"cell":[6,9],"type":"table"},{"cell":[6,10],"type":"armchair"},{"cell":[6,12],"type":"cabinet"},{"cell":[6,15],"type":"gramophone"},{"cell":[7,1],"type":"fireplace"},{"cell":[7,3],"type":"sofa"},{"cell":[7,6],"type":"plant"},{"cell":[7,13],"type":"chair"},{"cell":[7,16],"type":"statue"},{"cell":[8,3],"type":"sofa"},{"cell":[8,8],"type":"lamp"},{"cell":[8,12],"type":"chair"},{"cell":[8,13],"type":"table"},{"cell":[8,14],"type":"chair"},{"cell":[9,4],"type":"cabinet"},{"cell":[9,8],"type":"carpet"},{"cell":[9,10],"type":"stairs"},{"cell":[9,13],"type":"chair"},{"cell":[10,2],"type":"rack"},{"cell":[10,11],"type":"cabinet"},{"cell":[11,7],"type":"rack"},{"cell":[11,9],"type":"carpet"},{"cell":[11,12],"type":"plant"},{"cell":[11,13],"type":"lamp"},{"cell":[11,16],"type":"plant"},{"cell":[12,3],"type":"rack"},{"cell":[12,10],"type":"statue"},{"cell":[12,12],"type":"desk"},{"cell":[12,16],"type":"statue"},{"cell":[13,1],"type":"sink"},{"cell":[13,4],"type":"sink"},{"cell":[13,10],"type":"lamp"},{"cell":[13,13],"type":"chair"},{"cell":[13,14],"type":"table"},{"cell":[13,15],"type":"chair"},{"cell":[14,2],"type":"table"},{"cell":[14,3],"type":"chair"},{"cell":[14,5],"type":"stairs"},{"cell":[14,8],"type":"billiard"},{"cell":[14,11],"type":"statue"},{"cell":[14,12],"type":"plant"},{"cell":[15,3],"type":"table"},{"cell":[15,13],"type":"plant"},{"cell":[16,2],"type":"sink"},{"cell":[16,5],"type":"cabinet"},{"cell":[16,6],"type":"bookcase"},{"cell":[16,16],"type":"statue"}],"wallFeatures":[],"extras":[],"cellSize":46},"persons":[{"id":"A","name":"Aldous","gender":"M","role":"family","color":"#c62828","avatar":{"bg":"#5a6e3d","skin":"#f0cdb0","hair":"#c9c3b8","style":"bald","shirt":"#4e342e","mustache":true,"mustacheColor":"#c9c3b8"},"clue":"He was beside a <b>potted plant</b>. He swapped places with <b>another man</b>.","job":"the host’s brother, a retired colonel","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Aldous\"><rect width=\"80\" height=\"80\" fill=\"#5a6e3d\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#4e342e\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f0cdb0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f0cdb0\"/><path d=\"M26 30 Q26 22 30 20 L30 34 Q26 34 26 30 Z\" fill=\"#c9c3b8\"/><path d=\"M54 30 Q54 22 50 20 L50 34 Q54 34 54 30 Z\" fill=\"#c9c3b8\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><path d=\"M33 41 Q40 37 47 41 Q40 43 33 41 Z\" fill=\"#c9c3b8\"/></svg>","solverRole":"family","constraints":[{"type":"swap_gender","gender":"M"},{"type":"beside","obj":"plant"}]},{"id":"B","name":"Bryony","gender":"F","role":"family","color":"#2e7d32","avatar":{"bg":"#6e2c4b","skin":"#f6d8c0","hair":"#d9b464","style":"bun","shirt":"#5b2c6f","necklace":true,"earrings":true},"clue":"<b>Somebody else</b> was beside the <b>same sink</b> as her. A <b>desk</b> was somewhere in her <b>row</b>.","job":"the host’s wife","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Bryony\"><rect width=\"80\" height=\"80\" fill=\"#6e2c4b\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#5b2c6f\"/><path d=\"M31 58 Q40 66 49 58\" fill=\"none\" stroke=\"#f3e2b3\" stroke-width=\"2\" stroke-dasharray=\"2 2\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f6d8c0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f6d8c0\"/><circle cx=\"40\" cy=\"15\" r=\"7\" fill=\"#d9b464\"/><path d=\"M26 32 Q26 16 40 16 Q54 16 54 32 Q50 24 40 24 Q30 24 26 32 Z\" fill=\"#d9b464\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"26\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/><circle cx=\"54\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/></svg>","solverRole":"family","constraints":[{"type":"someone_share_object","obj":"sink"},{"type":"row_has","obj":"desk"}]},{"id":"C","name":"Clifford","gender":"M","role":"family","color":"#1565c0","avatar":{"bg":"#2f4858","skin":"#f1c8a5","hair":"#2b1c14","style":"slick","shirt":"#151318","glasses":true,"bow":true},"clue":"A <b>carpet</b> was somewhere in his <b>column</b>. Before the dark, he was in a <b>corner of his area</b>.","job":"the host’s nephew, a young barrister","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Clifford\"><rect width=\"80\" height=\"80\" fill=\"#2f4858\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#151318\"/><path d=\"M40 60 l-8 -4 v8 z M40 60 l8 -4 v8 z\" fill=\"#b8302b\"/><circle cx=\"40\" cy=\"60\" r=\"2\" fill=\"#7a1f1c\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f1c8a5\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f1c8a5\"/><path d=\"M26 30 Q27 16 44 15 Q56 15 55 26 Q48 22 40 23 Q30 24 26 30 Z\" fill=\"#2b1c14\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"34\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><circle cx=\"46\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><line x1=\"39\" y1=\"35\" x2=\"41\" y2=\"35\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/></svg>","solverRole":"family","constraints":[{"type":"before","atom":{"type":"corner_of_area"}},{"type":"col_has","obj":"carpet"}]},{"id":"D","name":"Daphne","gender":"F","role":"family","color":"#6a1b9a","avatar":{"bg":"#8c3a5a","skin":"#f6d8c0","hair":"#b7482c","style":"bob","shirt":"#2a9d8f","headband":"#f2d24a","earrings":true},"clue":"She was <b>not</b> beside a <b>potted plant</b>. Before the dark, she was in the <b>Gallery</b>.","job":"the host’s daughter","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Daphne\"><rect width=\"80\" height=\"80\" fill=\"#8c3a5a\"/><path d=\"M22 40 Q22 14 40 14 Q58 14 58 40 L58 58 L22 58 Z\" fill=\"#b7482c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#2a9d8f\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f6d8c0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f6d8c0\"/><path d=\"M26 36 Q26 16 40 16 Q54 16 54 36 Q52 24 40 24 Q28 24 26 36 Z\" fill=\"#b7482c\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><rect x=\"26\" y=\"23\" width=\"28\" height=\"5\" rx=\"2\" fill=\"#f2d24a\"/><circle cx=\"26\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/><circle cx=\"54\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/></svg>","solverRole":"family","constraints":[{"type":"not_beside","obj":"plant"},{"type":"before","atom":{"type":"area","areas":["Gallery"]}}]},{"id":"E","name":"Euphemia","gender":"F","role":"guest","color":"#e65100","avatar":{"bg":"#3b2f4a","skin":"#e9c6a4","hair":"#1c1a1a","style":"bob","shirt":"#7a2f6f","turban":"#2a6f6f","necklace":true},"clue":"An <b>armchair</b> was somewhere in her area. She swapped places with a <b>member of staff</b>.","job":"a fashionable lady novelist","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Euphemia\"><rect width=\"80\" height=\"80\" fill=\"#3b2f4a\"/><path d=\"M22 40 Q22 14 40 14 Q58 14 58 40 L58 58 L22 58 Z\" fill=\"#1c1a1a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#7a2f6f\"/><path d=\"M31 58 Q40 66 49 58\" fill=\"none\" stroke=\"#f3e2b3\" stroke-width=\"2\" stroke-dasharray=\"2 2\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#e9c6a4\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e9c6a4\"/><path d=\"M26 36 Q26 16 40 16 Q54 16 54 36 Q52 24 40 24 Q28 24 26 36 Z\" fill=\"#1c1a1a\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><path d=\"M24 31 Q25 7 40 7 Q55 7 56 31 Q48 20 40 20 Q32 20 24 31 Z\" fill=\"#2a6f6f\"/><path d=\"M27 20 Q40 30 53 20\" fill=\"none\" stroke=\"rgba(0,0,0,.12)\" stroke-width=\"2\"/><path d=\"M32 12 Q40 4 50 12\" fill=\"none\" stroke=\"rgba(0,0,0,.12)\" stroke-width=\"2\"/></svg>","solverRole":"guest","constraints":[{"type":"area_has","obj":"armchair"},{"type":"swap_role","role":"staff"}]},{"id":"F","name":"Francis","gender":"M","role":"guest","color":"#00838f","avatar":{"bg":"#7a6a3c","skin":"#f0cdb0","hair":"#5a3a22","style":"short","shirt":"#264653","beard":true,"scarf":"#c0392b"},"clue":"There was <b>a family member</b> in his area. Before the dark, an <b>armchair</b> was somewhere in his <b>column</b>.","job":"a London art dealer","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Francis\"><rect width=\"80\" height=\"80\" fill=\"#7a6a3c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#264653\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f0cdb0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f0cdb0\"/><path d=\"M26 32 Q26 15 40 15 Q54 15 54 32 Q50 24 40 24 Q30 24 26 32 Z\" fill=\"#5a3a22\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><path d=\"M27 38 Q30 52 40 53 Q50 52 53 38 Q50 47 40 48 Q30 47 27 38 Z\" fill=\"#5a3a22\"/><path d=\"M30 58 Q40 70 50 58 L48 66 Q40 76 32 66 Z\" fill=\"#c0392b\"/></svg>","solverRole":"guest","constraints":[{"type":"before","atom":{"type":"col_has","obj":"armchair"}},{"type":"with_role","role":"family"}]},{"id":"G","name":"Geraldine","gender":"F","role":"guest","color":"#ad1457","avatar":{"bg":"#4e6f8a","skin":"#f1c8a5","hair":"#8a8278","style":"bun","shirt":"#37474f","glasses":true},"clue":"The <b>billiard table</b> was somewhere in her area. She swapped places with a <b>man</b>.","job":"the vicar’s wife","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Geraldine\"><rect width=\"80\" height=\"80\" fill=\"#4e6f8a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#37474f\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f1c8a5\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f1c8a5\"/><circle cx=\"40\" cy=\"15\" r=\"7\" fill=\"#8a8278\"/><path d=\"M26 32 Q26 16 40 16 Q54 16 54 32 Q50 24 40 24 Q30 24 26 32 Z\" fill=\"#8a8278\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"34\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><circle cx=\"46\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><line x1=\"39\" y1=\"35\" x2=\"41\" y2=\"35\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/></svg>","solverRole":"guest","constraints":[{"type":"area_has","obj":"billiard"},{"type":"swap_gender","gender":"M"}]},{"id":"H","name":"Harvey","gender":"M","role":"guest","color":"#5d4037","avatar":{"bg":"#7a3c3c","skin":"#e7b98f","hair":"#1c1a1a","style":"slick","shirt":"#f4efe6","mustache":true,"mustacheColor":"#1c1a1a"},"clue":"There was a <b>woman</b> in his area. Before the dark, he was in the <b>first column</b>.","job":"an American film producer","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Harvey\"><rect width=\"80\" height=\"80\" fill=\"#7a3c3c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#f4efe6\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#e7b98f\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e7b98f\"/><path d=\"M26 30 Q27 16 44 15 Q56 15 55 26 Q48 22 40 23 Q30 24 26 30 Z\" fill=\"#1c1a1a\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><path d=\"M33 41 Q40 37 47 41 Q40 43 33 41 Z\" fill=\"#1c1a1a\"/></svg>","solverRole":"guest","constraints":[{"type":"with_gender","gender":"F"},{"type":"before","atom":{"type":"col","cols":[1]}}]},{"id":"I","name":"Isabel","gender":"F","role":"guest","color":"#827717","avatar":{"bg":"#6e4a2c","skin":"#f6d8c0","hair":"#e2c26a","style":"curly","shirt":"#b71c1c","earrings":true,"necklace":true},"clue":"A <b>wooden chair</b> was somewhere in her area. Before the dark, she was in the <b>Music Room</b>.","job":"a young actress","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Isabel\"><rect width=\"80\" height=\"80\" fill=\"#6e4a2c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#b71c1c\"/><path d=\"M31 58 Q40 66 49 58\" fill=\"none\" stroke=\"#f3e2b3\" stroke-width=\"2\" stroke-dasharray=\"2 2\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f6d8c0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f6d8c0\"/><path d=\"M25 34 q-3 -8 4 -10 q0 -8 8 -7 q3 -4 8 -1 q6 -3 9 3 q7 0 5 8 q4 4 -1 9 q-6 -14 -16 -12 q-9 -1 -17 10 Z\" fill=\"#e2c26a\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"26\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/><circle cx=\"54\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/></svg>","solverRole":"guest","constraints":[{"type":"area_has","obj":"chair"},{"type":"before","atom":{"type":"area","areas":["Music Room"]}}]},{"id":"J","name":"Julian","gender":"M","role":"guest","color":"#283593","avatar":{"bg":"#35607a","skin":"#f0cdb0","hair":"#8a5a2b","style":"short","shirt":"#4e342e","glasses":true,"mustache":true,"mustacheColor":"#8a5a2b"},"clue":"He was the <b>only man</b> sitting in a <b>wooden chair</b>. Before the dark, he was sitting in an <b>armchair</b>.","job":"the village doctor","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Julian\"><rect width=\"80\" height=\"80\" fill=\"#35607a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#4e342e\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f0cdb0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f0cdb0\"/><path d=\"M26 32 Q26 15 40 15 Q54 15 54 32 Q50 24 40 24 Q30 24 26 32 Z\" fill=\"#8a5a2b\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"34\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><circle cx=\"46\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><line x1=\"39\" y1=\"35\" x2=\"41\" y2=\"35\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><path d=\"M33 41 Q40 37 47 41 Q40 43 33 41 Z\" fill=\"#8a5a2b\"/></svg>","solverRole":"guest","constraints":[{"type":"only_on","obj":"chair","gender":"M"},{"type":"before","atom":{"type":"on","obj":"armchair"}}]},{"id":"K","name":"Kathleen","gender":"F","role":"guest","color":"#33691e","avatar":{"bg":"#5a2a6e","skin":"#e9c6a4","hair":"#5a3a22","style":"ponytail","shirt":"#e0b050","earrings":true},"clue":"Somebody else in her area was beside a <b>staircase</b>. She was on an <b>armchair</b>, a <b>carpet</b>, a <b>wooden chair</b> or a <b>sofa</b>.","job":"a society photographer","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Kathleen\"><rect width=\"80\" height=\"80\" fill=\"#5a2a6e\"/><path d=\"M50 30 Q64 34 60 62 L54 62 Q56 40 48 36 Z\" fill=\"#5a3a22\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#e0b050\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#e9c6a4\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e9c6a4\"/><path d=\"M26 33 Q26 16 40 16 Q54 16 54 33 Q50 24 40 24 Q30 24 26 33 Z\" fill=\"#5a3a22\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"26\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/><circle cx=\"54\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/></svg>","solverRole":"guest","constraints":[{"type":"with_beside","obj":"stairs"},{"type":"on_any","objs":["armchair","carpet","chair","sofa"]}]},{"id":"L","name":"Lawrence","gender":"M","role":"staff","color":"#37474f","avatar":{"bg":"#2f3b4c","skin":"#f0cdb0","hair":"#2b2b2b","style":"bald","shirt":"#151318","bow":true},"clue":"He and <b>Harvey</b> were beside the <b>same kind of thing</b>. He was on an <b>armchair</b>, a <b>carpet</b>, a <b>wooden chair</b> or a <b>sofa</b>.","job":"the butler","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Lawrence\"><rect width=\"80\" height=\"80\" fill=\"#2f3b4c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#151318\"/><path d=\"M40 60 l-8 -4 v8 z M40 60 l8 -4 v8 z\" fill=\"#b8302b\"/><circle cx=\"40\" cy=\"60\" r=\"2\" fill=\"#7a1f1c\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f0cdb0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f0cdb0\"/><path d=\"M26 30 Q26 22 30 20 L30 34 Q26 34 26 30 Z\" fill=\"#2b2b2b\"/><path d=\"M54 30 Q54 22 50 20 L50 34 Q54 34 54 30 Z\" fill=\"#2b2b2b\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/></svg>","solverRole":"staff","constraints":[{"type":"same_object_type","q":"H"},{"type":"on_any","objs":["armchair","carpet","chair","sofa"]}]},{"id":"M","name":"Mildred","gender":"F","role":"staff","color":"#bf360c","avatar":{"bg":"#4a2f3b","skin":"#f6d8c0","hair":"#2b1c14","style":"bun","shirt":"#151318","apron":true,"headband":"#f4efe6"},"clue":"Somebody else in her area was on a <b>carpet</b>. Before the dark, she was in the <b>Hall</b>.","job":"the housemaid","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Mildred\"><rect width=\"80\" height=\"80\" fill=\"#4a2f3b\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#151318\"/><path d=\"M28 80 L30 62 Q40 58 50 62 L52 80 Z\" fill=\"#f4efe6\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f6d8c0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f6d8c0\"/><circle cx=\"40\" cy=\"15\" r=\"7\" fill=\"#2b1c14\"/><path d=\"M26 32 Q26 16 40 16 Q54 16 54 32 Q50 24 40 24 Q30 24 26 32 Z\" fill=\"#2b1c14\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><rect x=\"26\" y=\"23\" width=\"28\" height=\"5\" rx=\"2\" fill=\"#f4efe6\"/></svg>","solverRole":"staff","constraints":[{"type":"with_on","obj":"carpet"},{"type":"before","atom":{"type":"area","areas":["Hall"]}}]},{"id":"N","name":"Nell","gender":"F","role":"staff","color":"#4e342e","avatar":{"bg":"#5a6e3d","skin":"#f0cdb0","hair":"#c9c3b8","style":"bob","shirt":"#8a5a44","apron":true},"clue":"Before the dark, a <b>cabinet</b> was somewhere in her <b>column</b>, and a <b>potted plant</b> was somewhere in her <b>row</b>.","job":"the cook","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Nell\"><rect width=\"80\" height=\"80\" fill=\"#5a6e3d\"/><path d=\"M22 40 Q22 14 40 14 Q58 14 58 40 L58 58 L22 58 Z\" fill=\"#c9c3b8\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#8a5a44\"/><path d=\"M28 80 L30 62 Q40 58 50 62 L52 80 Z\" fill=\"#f4efe6\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f0cdb0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f0cdb0\"/><path d=\"M26 36 Q26 16 40 16 Q54 16 54 36 Q52 24 40 24 Q28 24 26 36 Z\" fill=\"#c9c3b8\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/></svg>","solverRole":"staff","constraints":[{"type":"before","atom":{"type":"col_has","obj":"cabinet"}},{"type":"before","atom":{"type":"row_has","obj":"plant"}}]},{"id":"O","name":"Oscar","gender":"M","role":"staff","color":"#00695c","avatar":{"bg":"#3d5a6e","skin":"#f1c8a5","hair":"#d9b464","style":"slick","shirt":"#151318","bow":true,"mustache":true,"mustacheColor":"#b08a3c"},"clue":"He was beside a <b>carpet</b>.","job":"the hired pianist","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Oscar\"><rect width=\"80\" height=\"80\" fill=\"#3d5a6e\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#151318\"/><path d=\"M40 60 l-8 -4 v8 z M40 60 l8 -4 v8 z\" fill=\"#b8302b\"/><circle cx=\"40\" cy=\"60\" r=\"2\" fill=\"#7a1f1c\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f1c8a5\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f1c8a5\"/><path d=\"M26 30 Q27 16 44 15 Q56 15 55 26 Q48 22 40 23 Q30 24 26 30 Z\" fill=\"#d9b464\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><path d=\"M33 41 Q40 37 47 41 Q40 43 33 41 Z\" fill=\"#b08a3c\"/></svg>","solverRole":"staff","constraints":[{"type":"beside","obj":"carpet"}]},{"id":"V","name":"Verner","gender":"M","role":"victim","color":"#1b1b1b","avatar":{"bg":"#5a2a2a","skin":"#f0cdb0","hair":"#e8e4dc","style":"short","shirt":"#2b2b38","beard":true,"glasses":true},"clue":"<b>The victim.</b> He was found in the <b>Library</b>, in an <b>armchair</b>.","job":"the host, a shipping magnate","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Verner\"><rect width=\"80\" height=\"80\" fill=\"#5a2a2a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#2b2b38\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#f0cdb0\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f0cdb0\"/><path d=\"M26 32 Q26 15 40 15 Q54 15 54 32 Q50 24 40 24 Q30 24 26 32 Z\" fill=\"#e8e4dc\"/><circle cx=\"34\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><circle cx=\"46\" cy=\"35\" r=\"1.6\" fill=\"#2b2b2b\"/><path d=\"M36 43 Q40 46 44 43\" fill=\"none\" stroke=\"#a5735a\" stroke-width=\"1.4\"/><circle cx=\"34\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><circle cx=\"46\" cy=\"35\" r=\"5\" fill=\"none\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><line x1=\"39\" y1=\"35\" x2=\"41\" y2=\"35\" stroke=\"#2b2b2b\" stroke-width=\"1.4\"/><path d=\"M27 38 Q30 52 40 53 Q50 52 53 38 Q50 47 40 48 Q30 47 27 38 Z\" fill=\"#e8e4dc\"/><path d=\"M12 12 L68 68 M68 12 L12 68\" stroke=\"#e0362e\" stroke-width=\"5\" stroke-linecap=\"round\" opacity=\".9\"/></svg>","solverRole":"family","constraints":[{"type":"area","areas":["Library"]},{"type":"on","obj":"armchair"}]}],"victim":"V","murderer":"E","verdict":{"solved":"Case closed! {name} is the murderer – before the dark she was alone with the victim, then she swapped places with Lawrence. Time: {time}.","who":"Lawrence was found with the victim, but he had swapped places with Euphemia – before the dark, {name} was the one alone with Verner."},"solution":{"A":[6,4],"B":[12,1],"C":[1,14],"D":[15,11],"E":[7,7],"F":[5,16],"G":[16,8],"H":[13,2],"I":[14,15],"J":[8,12],"K":[11,9],"L":[3,3],"M":[10,10],"N":[9,6],"O":[4,13],"V":[2,5]},"walkthrough":[{"place":["B"],"cand":{"V":[[2,5],[3,3]],"K":[[9,8],[11,9]]},"text":"Start with what the board shows now. Bryony has a desk in her row (row 2 or 12) and shares a sink with somebody: only R12C1, beside the Kitchen sink R13C1, fits – <b>Bryony is at R12C1</b>. The second person at that sink cannot be at R14C1, in her column, so <b>somebody is at R13C2</b>: row 13 and column 2 are taken as well. Harvey was in the first column before the dark; that column now holds Bryony, so <b>Harvey swapped places with Bryony</b>. Kathleen is on a seat or a carpet in a room where somebody else is beside a staircase. The Gallery has neither seat nor carpet, so she is on a carpet in the Hall, R9C8 or R11C9, and the person beside the staircase R9C10 is at R8C10 or R10C10 (R9C9 would block both carpets) – <b>column 10 is taken</b>. Verner sits in one of the two armchairs of the Library, R2C5 or R3C3."},{"place":["A"],"cand":{"V":[[2,5],[3,3]],"K":[[9,8],[11,9]]},"text":"Now the swaps. A sentence that begins with “Before the dark” describes the square where the speaker’s partner is now. Daphne was in the Gallery, so her partner is there now. The Gallery has no seat, no carpet and no billiard table, and none of its columns holds a carpet – that rules out Julian, Kathleen, Lawrence, Mildred, Isabel, Euphemia, Geraldine and Clifford; Aldous swapped with a man, Harvey with Bryony. <b>Daphne swapped with Francis or Nell.</b> Euphemia swapped with a member of staff – not Oscar, who stayed, and not Mildred, whose partner is now in the Hall, a room without an armchair: <b>Lawrence or Nell.</b> Geraldine swapped with a man – not Aldous (he swapped with a man himself), not Harvey, not Julian (his partner now sits in an armchair, and the Billiard Room has none) and not Clifford (his partner is now in a corner of an area, but the free corners of the Billiard Room are R12C6 and R12C7, in Bryony’s row, and R16C10, in the taken column 10): <b>Francis or Lawrence.</b> Three women with only three possible partners between them: <b>Francis, Lawrence and Nell swapped with Daphne, Euphemia and Geraldine</b>, in some order. Isabel’s partner is now in the Music Room, and her own area has a wooden chair: the partner is not Kathleen (she is in the Hall), not Julian or Mildred (Isabel would now be in an armchair or in the Hall, in a room without a wooden chair) and not Aldous (he swapped with a man) – <b>Isabel swapped with Clifford</b>. The only man left for Aldous is Julian: <b>Aldous swapped with Julian</b>, and <b>Kathleen with Mildred</b>. Julian was sitting in an armchair before the dark, so Aldous sits in one now, beside a potted plant: <b>Aldous is at R6C4</b>."},{"cand":{"V":[[2,5],[3,3]],"K":[[9,8],[11,9]]},"text":"How do the three pairs go together? Suppose Daphne had swapped with Francis. Then Geraldine swapped with Lawrence and Euphemia with Nell. Euphemia would be on Nell’s old square – a cabinet in its column, a potted plant in its row – in a room with an armchair: that is R7C4, R7C5 or R7C10; column 4 is Aldous’s and column 10 is taken, so she would be at R7C5. Francis would be in the Gallery, where Daphne was, and he needs a family member there. Bryony is in the Kitchen, Aldous in the Drawing Room, Clifford in the Music Room, where Isabel was, and Verner – for Francis’s sentence the victim is a family member too – in the Library. Only Daphne is left; but she would be on Francis’s old square, with an armchair in her column, and of the columns with an armchair the Gallery reaches only columns 4 and 5 – both taken. Contradiction: <b>Daphne swapped with Nell</b>, so <b>Euphemia swapped with Lawrence</b> and <b>Geraldine with Francis</b>. All seven pairs are known: <b>Aldous–Julian, Bryony–Harvey, Clifford–Isabel, Daphne–Nell, Euphemia–Lawrence, Francis–Geraldine, Kathleen–Mildred</b>. But who was alone with Verner before the dark depends on who is with him in the Library now – and that can still be Euphemia, Francis, Lawrence or Oscar."},{"place":["K"],"cand":{"V":[[2,5],[3,3]],"G":[[15,8],[16,8]],"M":[[8,10],[10,10]],"I":[[5,11],[7,14],[8,16],[10,16],[14,15],[16,3]],"D":[[5,5],[5,11],[5,12],[7,5],[7,11],[7,12],[15,5],[15,11]]},"text":"Read the pairs back onto the board. Geraldine is on Francis’s old square, with an armchair in her column – in the Billiard Room that is column 8 (column 10 is taken), and R13C8 lies in the taken row 13: she is at R15C8 or R16C8. Column 8 is hers, so <b>Kathleen is at R11C9</b>. Nell is in the Gallery; Clifford is in the Music Room, in column 11 or 14 (a carpet in his column); Isabel is in a corner of a room with a wooden chair: R5C11, R7C14, R8C16, R10C16, R14C15 or R16C3. Daphne’s square has a cabinet in its column and a potted plant in its row, but she is not beside a potted plant: R5C5, R5C11, R5C12, R7C5, R7C11, R7C12, R15C5 or R15C11. Who is beside the staircase, at R8C10 or R10C10? Not Oscar (no carpet beside those squares), not Harvey (he would be beside nothing but the staircase, and Lawrence, on a seat or a carpet, is never beside one), not Francis (no family member can join him in the Hall), and everybody else is tied to another room or to a seat. <b>It is Mildred</b> – with Kathleen on the carpet, as Mildred’s statement says."},{"place":["H","L","V"],"cand":{"G":[[15,8],[16,8]],"M":[[8,10],[10,10]],"I":[[5,11],[7,14],[8,16],[10,16],[14,15]],"D":[[5,11],[5,12],[7,11],[7,12],[15,11]]},"text":"Lawrence is on a seat or a carpet, beside some object, and not on a wooden chair (Julian is the only man on one). Row 6 and column 8 are taken, and R2C3 would block both of Verner’s armchairs – so Lawrence is in the armchair R3C3 (beside a table and a carpet) or on a sofa: R5C12 (beside a wooden chair and the sofa), R5C13, R7C3 or R8C3 (beside the sofa only). The person at R13C2 can only be Harvey or Francis. Suppose it were Francis. Column 16 can only hold Francis or Isabel (it has no seat and no carpet, and nothing there is beside a table, a carpet, a wooden chair or a sofa, as Harvey must be), so Isabel is at R8C16 or R10C16, and with Mildred she fills rows 8 and 10. Row 14 can only hold Francis, Isabel or Julian (Harvey would need a woman in the Morning Room, and that could only be Isabel, in the same row), so Julian is at R14C3; column 3 is his, which puts Lawrence on the sofa in row 5 and Verner at R2C5. Rows 15 and 16 need a second person in addition to Geraldine, and only Daphne is left for that, at R15C11 – so Clifford is in column 14. Now Harvey: like Lawrence he must be beside a wooden chair or a sofa, with a woman in his area. In the Music Room (R3C12, R4C13) there is no woman; in the Dining Room, where Isabel is, R7C12 and R9C12 are beside a wooden chair but no sofa – that needs Lawrence at R5C12, in the same column – and R9C14 is in Clifford’s column. Harvey has no square. So <b>Harvey is at R13C2</b>, beside a sink and a table; Lawrence must be beside a table too: <b>Lawrence is at R3C3</b>, and <b>Verner at R2C5</b>."},{"place":["D","G"],"cand":{"M":[[8,10],[10,10]],"E":[[5,7],[7,7]],"N":[[4,6],[5,6],[8,6],[9,6],[10,6]],"C":[[1,14],[4,14],[5,14],[7,14]],"I":[[7,14],[8,16],[10,16],[14,15]]},"text":"Lawrence was found with Verner in the Library – but the board shows the places after the lights came on. Lawrence swapped with Euphemia, so before the dark it was <b>Euphemia who was alone with Verner</b>. Only now, with Lawrence placed, is that settled: until this moment Euphemia herself, Francis (Verner is a family member) or Oscar could have been the one in the Library. Back to the board. The Library is full and every column of the Drawing Room is taken, so Euphemia is in the Smoking Room, at R5C7 or R7C7 – column 7 is hers. Nell’s Gallery squares outside Verner’s column 5 all lie in column 6: column 6 is hers. Rows 15 and 16: one is Geraldine’s. The other can only be Daphne’s (R15C11) or Francis’s, in the Conservatory – but he would need Daphne there as his family member, again at R15C11. Either way <b>Daphne is at R15C11</b>, and so <b>Geraldine is at R16C8</b>. Column 11 is Daphne’s, so Clifford is in column 14."},{"place":["I","C","O","F","E","J","M","N"],"text":"Francis needs a family member in his area. The Library is full, the Kitchen and the Drawing Room have no free square for him, so he is with Clifford in the Music Room or with Daphne in the Conservatory – there only R14C16 is left. Row 1 can only be Clifford’s (R1C14) or Francis’s; row 14 only Isabel’s (the corner R14C15) or Francis’s (Julian’s chair R14C3 is in Lawrence’s column). If Francis were at R14C16, Clifford would be at R1C14 and Isabel would have no corner left: R5C11 is in Daphne’s column, R7C14 in Clifford’s, R8C16 and R10C16 in Francis’s. So <b>Isabel is at R14C15</b>; column 16 is then Francis’s (R4C16 or R5C16), and <b>Clifford is at R1C14</b>. Oscar is beside a carpet: R4C11, R4C15 and R5C14 are in taken columns – <b>Oscar is at R4C13</b>, hence <b>Francis at R5C16</b> and <b>Euphemia at R7C7</b>. Julian has one wooden chair left, <b>R8C12</b>; that sends <b>Mildred to R10C10</b> and <b>Nell to R9C6</b>."},{"final":true,"text":"Case closed. When the lights came on, Lawrence, the butler, sat in the other armchair of the Library, the only person in the room with the dead man – but he had only just groped his way there from the Smoking Room, where Euphemia is now. Before the dark it was Euphemia who was alone with Verner in the Library: <b>Euphemia is the murderer!</b>"}],"solver":{"rules":[{"type":"swap","fixed":["O"]}],"occupiable":["armchair","carpet","chair","sofa"]},"verification":{"tool":"tools/murdoku_solver.py","unique":true,"guessFree":true,"checked":"2026-10-05"}}