{"format":"murdoku-puzzle/1","id":"chess","version":1,"difficulty":"expert","level":10,"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":"The Chess Club","tagline":"Corvin Chess Club · Saturday evening · the last round of the championship","author":"mathace","concept":"Murdoku – Manuel Garand (murdoku.com); unofficial fan-made case","created":"2026-09-24","story":"The last round of the Corvin Chess Club championship, Saturday evening. At nine the chief arbiter stopped the clocks for the prize-giving announcement – and in the Library, where the top board was being played, Vladimir, the reigning champion, was found dead beside his chessboard, the position still on the board. Sixteen people were in the club: eight players in four unfinished games, two officials, two members of the café staff and four spectators. Nobody saw who sat across from the champion. Read every statement, work out which four boards were in play, find everyone’s square on the plan and unmask the murderer – the opponent who was alone with Vladimir in the Library.","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 (chessboards, tables, bookcases, the counter, the screens…) cannot be occupied; the chairs, the stool, the benches, the armchairs and the sofa can. 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.","<i>“Right beside an area where nobody was”</i> = on a square that touches an empty area directly – left, right, above or below, across the wall.","Directions refer to rows and columns, not to the same line: <i>“exactly one row north of him was a woman”</i> = the person in the row directly above is a woman, in any column; <i>“north of Adrian”</i> = in a row further up, in any column.","The murderer was <b>alone with the victim</b>: nobody else was in that area."],"special":["<b>Four games:</b> eight chessboards stand in the club, and <b>exactly four games</b> were in progress. Beside a board in play there were <b>exactly two people – the two opponents</b>; beside every other board there was <b>nobody</b>. <b>Every player was beside a chessboard</b>; the officials, the café staff and the spectators were never beside one.","<b>Across the board:</b> since every row and column holds one person, the two opponents at a board always take its <b>row and its column</b> – one of them is beside the board in its row, the other in its column. So two boards in the same row or column cannot both be in play. In a statement, <i>“my opponent”</i> is the other person beside the same board."]},"roleNames":{"player":"player","official":"official","staff":"café staff","spectator":"spectator","victim":"victim"},"personGroups":[{"id":"players","name":"The players","persons":["A","B","C","D","E","F","G","V"]},{"id":"officials","name":"Officials","persons":["H","I"]},{"id":"staff","name":"Café 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stroke-width=\"1.2\"/>"}},"wallTypes":{},"objects":[{"cell":[1,1],"type":"rack"},{"cell":[1,5],"type":"plant"},{"cell":[1,6],"type":"counter"},{"cell":[1,7],"type":"counter"},{"cell":[1,8],"type":"kettle"},{"cell":[1,13],"type":"vending"},{"cell":[1,14],"type":"shelf"},{"cell":[1,16],"type":"stove"},{"cell":[2,1],"type":"painting"},{"cell":[2,9],"type":"chair"},{"cell":[2,10],"type":"table"},{"cell":[2,11],"type":"chair"},{"cell":[2,16],"type":"sink"},{"cell":[3,1],"type":"rack"},{"cell":[3,7],"type":"chessboard"},{"cell":[3,11],"type":"chair"},{"cell":[3,12],"type":"table"},{"cell":[3,13],"type":"chair"},{"cell":[4,6],"type":"plant"},{"cell":[4,11],"type":"plant"},{"cell":[4,12],"type":"bookcase"},{"cell":[4,13],"type":"bookcase"},{"cell":[4,16],"type":"tv"},{"cell":[5,3],"type":"chessboard"},{"cell":[5,8],"type":"chessboard"},{"cell":[5,11],"type":"tv"},{"cell":[5,12],"type":"chair"},{"cell":[6,7],"type":"chair"},{"cell":[6,14],"type":"chessboard"},{"cell":[7,2],"type":"table"},{"cell":[7,10],"type":"desk"},{"cell":[7,12],"type":"table"},{"cell":[7,13],"type":"chair"},{"cell":[8,4],"type":"chessboard"},{"cell":[8,8],"type":"chair"},{"cell":[8,10],"type":"chair"},{"cell":[8,12],"type":"plant"},{"cell":[9,1],"type":"vending"},{"cell":[9,4],"type":"bench"},{"cell":[9,11],"type":"lamp"},{"cell":[9,13],"type":"trophy"},{"cell":[9,16],"type":"cabinet"},{"cell":[10,3],"type":"chessboard"},{"cell":[10,8],"type":"chessboard"},{"cell":[10,12],"type":"globe"},{"cell":[10,15],"type":"trophy"},{"cell":[11,1],"type":"bookcase"},{"cell":[11,2],"type":"bookcase"},{"cell":[11,3],"type":"bookcase"},{"cell":[11,6],"type":"table"},{"cell":[11,7],"type":"stool"},{"cell":[11,10],"type":"lamp"},{"cell":[11,11],"type":"plant"},{"cell":[11,13],"type":"tv"},{"cell":[11,16],"type":"painting"},{"cell":[12,6],"type":"cabinet"},{"cell":[12,10],"type":"safe"},{"cell":[12,13],"type":"sofa"},{"cell":[12,14],"type":"sofa"},{"cell":[13,2],"type":"chessboard"},{"cell":[13,7],"type":"desk"},{"cell":[13,8],"type":"chair"},{"cell":[13,12],"type":"table"},{"cell":[13,15],"type":"armchair"},{"cell":[14,4],"type":"lamp"},{"cell":[14,5],"type":"shelf"},{"cell":[14,9],"type":"cabinet"},{"cell":[14,12],"type":"lamp"},{"cell":[14,13],"type":"plant"},{"cell":[14,16],"type":"statue"},{"cell":[15,3],"type":"armchair"},{"cell":[15,4],"type":"plant"},{"cell":[15,11],"type":"umbrella"},{"cell":[15,14],"type":"bench"},{"cell":[16,1],"type":"bookcase"},{"cell":[16,4],"type":"planter"},{"cell":[16,6],"type":"bench"},{"cell":[16,10],"type":"fountain"},{"cell":[16,16],"type":"planter"}],"wallFeatures":[],"extras":[],"cellSize":46},"persons":[{"id":"A","name":"Adrian","gender":"M","role":"player","color":"#c62828","avatar":{"bg":"#2f4858","skin":"#f1c8a5","hair":"#5a3a22","style":"short","shirt":"#264653","headband":"#f0b429"},"clue":"He was in the <b>Tournament Hall</b>.","job":"junior champion","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Adrian\"><rect width=\"80\" height=\"80\" fill=\"#2f4858\"/><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=\"#f1c8a5\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#f1c8a5\"/><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\"/><rect x=\"26\" y=\"23\" width=\"28\" height=\"5\" rx=\"2\" fill=\"#f0b429\"/></svg>","solverRole":"player","constraints":[{"type":"area","areas":["Tournament 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He was <b>not</b> beside a <b>chair</b>.","job":"the club’s oldest member","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Gerald\"><rect width=\"80\" height=\"80\" fill=\"#35607a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#8b5a2b\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#e4b998\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e4b998\"/><path d=\"M26 30 Q27 16 44 15 Q56 15 55 26 Q48 22 40 23 Q30 24 26 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\"/><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=\"#c9c3b8\"/></svg>","solverRole":"player","constraints":[{"type":"rel","q":"B","dir":"S"},{"type":"not_beside","obj":"chair"},{"type":"beside","obj":"chessboard","rule":true}]},{"id":"H","name":"Hermione","gender":"F","role":"official","color":"#5d4037","avatar":{"bg":"#8c3a5a","skin":"#f1c8a5","hair":"#5a3a22","style":"long","shirt":"#2f3b4c","scarf":"#f2d24a"},"clue":"She was <b>not alone</b> in her area.","job":"chief arbiter","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Hermione\"><rect width=\"80\" height=\"80\" fill=\"#8c3a5a\"/><path d=\"M22 42 Q20 14 40 14 Q60 14 58 42 L62 72 L18 72 Z\" fill=\"#5a3a22\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#2f3b4c\"/><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 36 Q26 16 40 16 Q54 16 54 36 Q52 24 40 24 Q28 24 26 36 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=\"M30 58 Q40 70 50 58 L48 66 Q40 76 32 66 Z\" fill=\"#f2d24a\"/></svg>","solverRole":"official","constraints":[{"type":"not_alone"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"I","name":"Irving","gender":"M","role":"official","color":"#827717","avatar":{"bg":"#4e6f8a","skin":"#e9c6a4","hair":"#1c1a1a","style":"short","shirt":"#1b1b1b","bow":true},"clue":"A <b>bookcase</b> was somewhere in his area. He and <b>Kevin</b> were on the <b>same diagonal</b>.","job":"tournament director","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Irving\"><rect width=\"80\" height=\"80\" fill=\"#4e6f8a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#1b1b1b\"/><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=\"#e9c6a4\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e9c6a4\"/><path d=\"M26 32 Q26 15 40 15 Q54 15 54 32 Q50 24 40 24 Q30 24 26 32 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\"/></svg>","solverRole":"official","constraints":[{"type":"area_has","obj":"bookcase"},{"type":"same_diagonal","q":"K"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"J","name":"Joanna","gender":"F","role":"staff","color":"#283593","avatar":{"bg":"#5a2a2a","skin":"#f0cdb0","hair":"#d9b464","style":"ponytail","shirt":"#f4efe6","apron":true},"clue":"She was in the <b>Café</b>.","job":"barista","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Joanna\"><rect width=\"80\" height=\"80\" fill=\"#5a2a2a\"/><path d=\"M50 30 Q64 34 60 62 L54 62 Q56 40 48 36 Z\" fill=\"#d9b464\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#f4efe6\"/><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 33 Q26 16 40 16 Q54 16 54 33 Q50 24 40 24 Q30 24 26 33 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\"/></svg>","solverRole":"staff","constraints":[{"type":"area","areas":["Cafe"]},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"K","name":"Kevin","gender":"M","role":"staff","color":"#33691e","avatar":{"bg":"#2f3b4c","skin":"#e7b98f","hair":"#2b1c14","style":"short","shirt":"#f4efe6","apron":true,"mustache":true},"clue":"He was sitting in a <b>chair</b>.","job":"waiter","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Kevin\"><rect width=\"80\" height=\"80\" fill=\"#2f3b4c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#f4efe6\"/><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=\"#e7b98f\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e7b98f\"/><path d=\"M26 32 Q26 15 40 15 Q54 15 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\"/><path d=\"M33 41 Q40 37 47 41 Q40 43 33 41 Z\" fill=\"#3a2a1c\"/></svg>","solverRole":"staff","constraints":[{"type":"on","obj":"chair"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"L","name":"Lena","gender":"F","role":"spectator","color":"#37474f","avatar":{"bg":"#6e2c4b","skin":"#f6d8c0","hair":"#b7482c","style":"bun","shirt":"#7a5a9a","earrings":true},"clue":"She was in a <b>corner of her area</b>. A <b>chair</b> was somewhere in her <b>row</b>.","job":"Adrian’s mother","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Lena\"><rect width=\"80\" height=\"80\" fill=\"#6e2c4b\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#7a5a9a\"/><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=\"#b7482c\"/><path d=\"M26 32 Q26 16 40 16 Q54 16 54 32 Q50 24 40 24 Q30 24 26 32 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\"/><circle cx=\"26\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/><circle cx=\"54\" cy=\"41\" r=\"1.8\" fill=\"#f0c95a\"/></svg>","solverRole":"spectator","constraints":[{"type":"corner_of_area"},{"type":"row_has","obj":"chair"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"M","name":"Miriam","gender":"F","role":"spectator","color":"#bf360c","avatar":{"bg":"#1b2a33","skin":"#e4b998","hair":"#1c1a1a","style":"bob","shirt":"#3f8a4a","glasses":true},"clue":"She was beside the <b>fountain</b>.","job":"chess columnist","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Miriam\"><rect width=\"80\" height=\"80\" fill=\"#1b2a33\"/><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=\"#3f8a4a\"/><rect x=\"34\" y=\"44\" width=\"12\" height=\"13\" fill=\"#e4b998\"/><ellipse cx=\"40\" cy=\"34\" rx=\"14\" ry=\"16\" fill=\"#e4b998\"/><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\"/><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":"spectator","constraints":[{"type":"beside","obj":"fountain"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"N","name":"Nicholas","gender":"M","role":"spectator","color":"#4e342e","avatar":{"bg":"#7a6a3c","skin":"#f1c8a5","hair":"#c9c3b8","style":"bald","shirt":"#8a949c","glasses":true},"clue":"A <b>painting</b> was somewhere in his <b>column</b>.","job":"club treasurer","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Nicholas\"><rect width=\"80\" height=\"80\" fill=\"#7a6a3c\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#8a949c\"/><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 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\"/><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":"spectator","constraints":[{"type":"col_has","obj":"painting"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"O","name":"Ophelia","gender":"F","role":"spectator","color":"#00695c","avatar":{"bg":"#3d5a6e","skin":"#f6d8c0","hair":"#5a3a22","style":"long","shirt":"#e8c0d0","headband":"#f0b429"},"clue":"She was <b>sitting on a seat</b> (an <b>armchair</b>, a <b>bench</b>, a <b>chair</b>, a <b>sofa</b> or the <b>stool</b>). <b>Exactly one row north</b> of her was a <b>woman</b>.","job":"chess student","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Ophelia\"><rect width=\"80\" height=\"80\" fill=\"#3d5a6e\"/><path d=\"M22 42 Q20 14 40 14 Q60 14 58 42 L62 72 L18 72 Z\" fill=\"#5a3a22\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#e8c0d0\"/><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=\"#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\"/><rect x=\"26\" y=\"23\" width=\"28\" height=\"5\" rx=\"2\" fill=\"#f0b429\"/></svg>","solverRole":"spectator","constraints":[{"type":"on_any","objs":["armchair","bench","chair","sofa","stool"]},{"type":"rel_any","dir":"N","exact":1,"gender":"F"},{"type":"not_beside","obj":"chessboard","rule":true}]},{"id":"V","name":"Vladimir","gender":"M","role":"victim","color":"#1b1b1b","avatar":{"bg":"#5a2a2a","skin":"#e9c6a4","hair":"#5a3a22","style":"slick","shirt":"#1b1b1b","beard":true},"clue":"<b>The victim.</b> He was found in the <b>Library</b>, beside the <b>chessboard</b> – alone with the murderer.","job":"the reigning champion","avatarSvg":"<svg viewBox=\"0 0 80 80\" xmlns=\"http://www.w3.org/2000/svg\" role=\"img\" aria-label=\"Vladimir\"><rect width=\"80\" height=\"80\" fill=\"#5a2a2a\"/><path d=\"M10 80 Q12 56 40 54 Q68 56 70 80 Z\" fill=\"#1b1b1b\"/><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 30 Q27 16 44 15 Q56 15 55 26 Q48 22 40 23 Q30 24 26 30 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=\"M12 12 L68 68 M68 12 L12 68\" stroke=\"#e0362e\" stroke-width=\"5\" stroke-linecap=\"round\" opacity=\".9\"/></svg>","solverRole":"player","constraints":[{"type":"area","areas":["Library"]},{"type":"beside","obj":"chessboard"}]}],"victim":"V","murderer":"D","solution":{"J":[1,10],"B":[2,7],"G":[3,6],"F":[4,3],"A":[5,4],"I":[6,12],"K":[7,13],"L":[8,15],"H":[9,5],"C":[10,9],"E":[11,8],"N":[12,16],"V":[13,1],"D":[14,2],"O":[15,14],"M":[16,11]},"walkthrough":[{"place":[],"cand":{"A":[[4,3],[5,4],[5,7],[5,9],[6,3],[6,8],[7,4],[8,3],[8,5]],"B":[[2,7],[3,6],[3,8],[4,3],[4,7],[5,4],[5,7],[5,9],[5,14],[6,3],[6,8],[6,13],[6,15],[7,4],[7,14],[8,3],[8,5],[12,2],[13,1],[13,3]],"C":[[3,6],[3,8],[5,4],[5,7],[5,9],[5,14],[6,3],[6,8],[6,13],[6,15],[8,3],[8,5],[10,4],[10,7],[10,9],[13,1],[13,3]],"D":[[4,3],[5,4],[5,7],[5,9],[5,14],[6,3],[6,8],[6,13],[6,15],[7,4],[7,14],[8,3],[8,5],[9,3],[10,4],[10,7],[10,9],[11,8],[12,2],[13,1],[13,3],[14,2]],"E":[[2,7],[3,6],[3,8],[4,3],[4,7],[5,4],[5,7],[5,9],[5,14],[6,3],[6,8],[6,13],[6,15],[7,4],[7,14],[8,3],[8,5],[9,3],[10,4],[10,7],[10,9],[11,8],[12,2],[13,1],[13,3],[14,2]],"F":[[4,3],[8,3],[11,8]],"G":[[3,6],[3,8],[4,3],[4,7],[5,4],[5,9],[5,14],[6,3],[6,15],[7,4],[8,3],[8,5],[9,3],[10,4],[10,7],[10,9],[11,8],[12,2],[13,1],[13,3],[14,2]],"I":[[4,14],[5,12],[5,13],[5,15],[6,12],[6,16],[7,15],[7,16],[8,14]],"J":[[1,9],[1,10],[1,11],[1,12],[2,5],[2,6],[2,8],[2,9],[2,11],[2,12],[2,13],[3,5],[3,9],[3,10],[3,11],[3,13],[3,14],[4,8],[4,9],[4,10]],"K":[[2,9],[2,11],[3,11],[3,13],[5,12],[6,7],[7,13],[8,8],[8,10]],"L":[[2,5],[2,14],[3,3],[3,4],[3,5],[3,14],[3,15],[3,16],[5,1],[6,11],[7,9],[7,11],[7,16],[8,1],[8,9],[8,11],[8,14],[8,15],[8,16]],"M":[[15,10],[16,9],[16,11]],"N":[[3,16],[4,1],[5,1],[5,16],[6,1],[6,16],[7,1],[7,16],[8,1],[8,16],[10,1],[10,16],[12,1],[12,16],[14,1],[15,1],[15,16]],"O":[[2,9],[2,11],[3,11],[3,13],[5,12],[6,7],[7,13],[8,8],[8,10],[9,4],[11,7],[12,13],[12,14],[15,3],[15,14],[16,6]],"V":[[12,2],[13,1],[13,3],[14,2]]},"text":"Four games at eight boards. Vladimir was found at the Library board R13C2, so he is on one of its four neighbouring squares – R12C2, R14C2, R13C1 or R13C3 – and his opponent, the murderer, across the board on the other axis: one of them in row 13, the other in column 2, and nobody else in the Library. Only players sit at boards, so the murderer is one of the seven players, and row 13 and column 2 are closed to everybody else: the Office chair R13C8 and the squares R5C2 and R10C2 are out, and the Blitz board R10C3 can only be reached from R10C4 and R9C3. Francesca sat at a board with an official in her room, right beside an area where nobody was: of the 28 board squares only R4C3 (next to the Cloakroom and the Foyer), R8C3 (next to the Blitz Room) and R11C8 (next to the Office) border a room that may be empty – the Hall has Adrian, the Café has Joanna, the Library is full, and the other board squares touch no other room at all. Irving has a bookcase in his room: the Library is out of bounds, so he is in the Analysis Room, never beside its board. Kevin sits on a chair on Irving’s diagonal – nine chairs are left (R13C8 is in row 13). Miriam is beside the fountain: R15C10, R16C9 or R16C11. Nicholas is in the column of one of the two paintings: column 1 or column 16. Joanna is in the Café; Lena needs a corner of a room in a row that has a chair – rows 2, 3, 5, 6, 7 or 8."},{"place":[],"cand":{"A":[[5,4],[5,7],[5,9],[6,8],[7,4],[8,5]],"B":[[2,7],[3,6],[3,8],[4,7],[5,4],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[7,4],[7,14],[8,5],[13,1]],"C":[[3,6],[3,8],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[8,5],[10,7],[10,9],[13,1]],"D":[[5,14],[6,13],[6,15],[7,14],[10,7],[10,9],[11,8],[13,1],[14,2]],"E":[[2,7],[3,6],[3,8],[4,7],[5,4],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[7,4],[7,14],[8,5],[10,7],[10,9],[11,8],[13,1],[14,2]],"F":[[4,3],[8,3]],"G":[[3,6],[3,8],[4,7],[5,4],[5,9],[5,14],[6,15],[7,4],[8,5],[10,7],[10,9],[11,8],[13,1],[14,2]],"H":[[4,4],[4,5],[5,5],[5,6],[5,10],[6,4],[6,5],[6,6],[6,7],[6,9],[6,10],[6,11],[7,5],[7,6],[7,7],[7,8],[8,6],[8,7],[8,8],[9,5],[9,6],[9,7],[9,8],[9,9],[9,10]],"I":[[4,14],[5,12],[5,13],[5,15],[6,12],[7,15],[8,14]],"J":[[1,9],[1,10],[1,11],[1,12]],"K":[[2,9],[3,11],[3,13],[7,13],[8,10]],"L":[[2,5],[2,14],[3,4],[3,5],[3,14],[3,15],[6,11],[7,9],[7,11],[8,9],[8,11],[8,14],[8,15]],"M":[[15,10],[16,9],[16,11]],"N":[[3,16],[5,16],[6,16],[7,16],[8,16],[10,16],[12,16],[15,16]],"O":[[2,9],[2,11],[3,11],[3,13],[5,12],[6,7],[7,13],[8,8],[8,10],[9,4],[11,7],[12,13],[12,14],[15,14],[16,6]],"V":[[13,1],[14,2]]},"text":"<b>Could Francesca be at R11C8?</b> Then the Blitz board R10C8 is in play, her opponent sits at R10C7 or R10C9, and row 10 and column 8 are theirs. Her official is Hermione (Irving is in the Analysis Room), who must be in the Blitz Room away from the boards, outside row 10, row 11 (Francesca’s) and column 2: only the bench R9C4 is left – in column 4. But the Hall’s boards need column 4: R5C4 is the only row-side square of R5C3 (R5C2 is in column 2), R7C4 the only column-side square of R8C4, and R5C8 has just lost its only column-side square R6C8 to column 8. No Hall board could be in play – yet Adrian is in the Hall at a board. So <b>Francesca is at R4C3 or R8C3</b>, in column 3 of the Tournament Hall, and Hermione is with her in the Hall. Column 3 is Francesca’s: the Blitz board R10C3 loses R9C3 and is empty. Row 13 has a single usable square left, R13C1 (R13C3 is in column 3), so Vladimir or his opponent is at R13C1 and the other one at R14C2, the only usable square of row 14 (its Office, Lounge and Courtyard squares suit nobody). Column 1 is theirs, so Nicholas is in column 16 – and every square of column 16 is reserved for him. Row 1 can only hold Joanna: R1C9–R1C12. Kevin’s chair needs an Analysis Room square on its diagonal that is not beside the board: R2C9 (Irving at R5C12), R3C11 (R5C13 or R7C15), R3C13 (R4C14 or R5C15), R7C13 (R6C12, R5C15 or R8C14) or R8C10 (R6C12, R5C13 or R4C14); R2C11, R5C12, R6C7 and R8C8 have none."},{"place":[],"cand":{"A":[[5,4],[7,4]],"B":[[2,7],[3,6],[3,8],[4,7],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[7,14],[8,5],[13,1]],"C":[[3,6],[3,8],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[8,5],[10,7],[10,9],[13,1]],"D":[[5,14],[6,13],[6,15],[7,14],[10,7],[10,9],[11,8],[13,1],[14,2]],"E":[[2,7],[3,6],[3,8],[4,7],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[7,14],[8,5],[10,7],[10,9],[11,8],[13,1],[14,2]],"F":[[4,3],[8,3]],"G":[[3,6],[3,8],[4,7],[5,9],[5,14],[6,15],[8,5],[10,7],[10,9],[11,8],[13,1],[14,2]],"H":[[9,5],[9,6],[9,7],[9,9],[9,10]],"I":[[4,14],[5,12],[5,13],[5,15],[6,12],[7,15],[8,14]],"J":[[1,9],[1,10],[1,11],[1,12]],"K":[[2,9],[3,11],[3,13],[7,13],[8,10]],"L":[[2,5],[2,14],[3,5],[3,14],[3,15],[6,11],[7,9],[7,11],[8,9],[8,11],[8,14],[8,15]],"M":[[15,10],[16,9],[16,11]],"N":[[3,16],[5,16],[6,16],[7,16],[8,16],[10,16],[12,16],[15,16]],"O":[[2,9],[2,11],[3,11],[3,13],[5,12],[6,7],[7,13],[8,8],[8,10],[11,7],[12,13],[12,14],[15,14],[16,6]],"V":[[13,1],[14,2]]},"text":"Adrian is in the Hall beside a board, outside columns 2 and 3: R5C4, R5C7, R5C9, R6C8, R7C4 or R8C5. <b>Not at the R5C8 board</b> (R5C7, R5C9 or R6C8): that game would take column 8, and R11C8, the only column-side square of the Blitz board R10C8, would be lost – R10C8 dead. Then row 10 could hold only Nicholas at R10C16 (R10C1 is in column 1, the row’s other squares suit nobody) and row 11 only Ophelia on the stool R11C7 – but Ophelia needs a woman exactly one row north of her, and Nicholas is a man. <b>Not at R8C5 either:</b> his opponent would sit at R7C4, the only column-side square of R8C4, taking column 4; Francesca could not be at R8C3 (row 8 would be Adrian’s), so she would be at R4C3, at the R5C3 board, whose only row-side square R5C4 lies in column 4 – nobody could face her. So <b>Adrian is at R5C4 or R7C4</b>, column 4 is his, and Adrian and Francesca are opponents: either at R5C3 (Adrian R5C4, Francesca R4C3) or at R8C4 (Adrian R7C4, Francesca R8C3), because the other of the two boards needs column 4 as well. Row 9 can be filled only by Hermione – its Blitz squares are in columns 2, 3 and 4, its Hall and Trophy Room squares suit nobody else – so <b>Hermione is in row 9</b>, R9C5–R9C10. Not R9C8, though: column 8 would again kill the Blitz board R10C8 and leave Ophelia on the stool without a woman above her."},{"place":[],"cand":{"A":[[5,4],[7,4]],"B":[[2,7],[3,6],[3,8],[4,7],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[7,14],[8,5],[13,1]],"C":[[3,6],[3,8],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[8,5],[10,7],[10,9],[13,1]],"D":[[5,14],[6,13],[6,15],[7,14],[10,7],[10,9],[11,8],[13,1],[14,2]],"E":[[2,7],[3,6],[3,8],[4,7],[5,7],[5,9],[5,14],[6,8],[6,13],[6,15],[7,14],[8,5],[10,7],[10,9],[11,8],[13,1],[14,2]],"F":[[4,3],[8,3]],"G":[[3,6],[3,8],[4,7],[5,9],[5,14],[6,15],[8,5],[10,7],[10,9],[11,8],[13,1],[14,2]],"H":[[9,5],[9,6],[9,7],[9,9],[9,10]],"I":[[4,14],[5,12],[5,13],[5,15],[6,12],[7,15],[8,14]],"J":[[1,9],[1,10],[1,11],[1,12]],"K":[[7,13]],"L":[[2,5],[2,14],[3,5],[3,14],[3,15],[6,11],[7,9],[7,11],[8,9],[8,11],[8,14],[8,15]],"M":[[15,10],[16,9],[16,11]],"N":[[3,16],[5,16],[6,16],[7,16],[8,16],[10,16],[12,16],[15,16]],"O":[[2,9],[2,11],[3,11],[3,13],[5,12],[6,7],[7,13],[8,8],[8,10],[11,7],[12,13],[12,14],[15,14],[16,6]],"V":[[13,1],[14,2]]},"text":"<b>Kevin’s chair.</b> <b>R2C9?</b> Irving is at R5C12 and takes row 5, so Adrian is at R7C4 and Francesca at R8C3; R5C3 and R5C8 are dead (column 4, row 5), the Analysis board too (its column-side squares R5C14 and R7C14 are in rows 5 and 7), so the Café and Blitz games are both on and the Café’s row-side player takes row 3. Lena needs a corner in a row with a chair: rows 2 (Kevin), 3, 5, 7 and 8 are taken, and row 6 has no corner square – impossible. <b>R3C11?</b> Irving is at R5C13 or R7C15, so Irving and Adrian hold rows 5 and 7 between them; R5C8 (row 5), the Analysis board (rows 5 and 7) and the Café board (row 3 is Kevin’s) are dead, leaving R5C3, R8C4 and R10C8 for three games – but R5C3 and R8C4 both need column 4 (R5C4, R7C4). <b>R3C13?</b> Row 3 kills the Café board, and Irving – at R4C14 (column 14) or R5C15 (column 15, with column 13 Kevin’s) – kills the Analysis board; Adrian and Francesca use one of R5C3/R8C4, and R5C8 and R10C8 share column 8 (R6C8, R11C8), so only three games are possible. <b>R8C10?</b> Row 8 puts Francesca at R4C3 and Adrian at R5C4 (rows 4–5, columns 3–4); Irving is at R6C12 (R5C13 and R4C14 are in rows 5 and 4) and kills the Analysis board’s row side; R5C8, R8C4 and R10C3 are dead, so the Café and Blitz games are on, the Café’s column-side player at R2C7 (R4C7 is in row 4). Lena’s rows 2, 3, 5, 6 and 8 are gone; in row 7 her only corner is R7C11, column 11, so Miriam is at R16C9 (R15C10 is in Kevin’s column), column 9 – and the Blitz row-side player must be at R10C7, in column 7, together with the Café player at R2C7. Contradiction. <b>Kevin is at R7C13.</b>"},{"place":["K","A","F","I","L","M","J","H"],"cand":{"B":[[2,7],[3,6],[13,1]],"C":[[3,6],[10,9],[13,1]],"D":[[10,9],[11,8],[13,1],[14,2]],"E":[[2,7],[3,6],[10,9],[11,8],[13,1],[14,2]],"G":[[3,6],[10,9],[11,8],[13,1],[14,2]],"N":[[12,16],[15,16]],"O":[[12,14],[15,14]],"V":[[13,1],[14,2]]},"text":"Kevin takes row 7, so <b>Adrian is at R5C4, Francesca at R4C3</b>, their game at R5C3: rows 4–5 and columns 3–4 are theirs, R8C4 and R5C8 are dead. Irving, on Kevin’s diagonal, is at R6C12, R8C14 or R5C15; R5C15 is in row 5, and the Analysis board is dead either way – its column-side squares R5C14 and R7C14 are in Adrian’s and Kevin’s rows. So the four games are the Library, R5C3, the Café board R3C7 and the Blitz board R10C8. The Café’s column-side player sits at R2C7 (R4C7 is in row 4), the Blitz column-side player at R11C8 – R3C8 is out and the Café’s row-side player is at R3C6 – and the Blitz row-side player at R10C9 (R10C7 is in the column of R2C7). Rows 12, 15 and 16 can be used only by Miriam, Nicholas and Ophelia, so those rows are theirs: row 6 is Irving’s, <b>Irving is at R6C12</b>. Column 15’s only usable square is Lena’s corner R8C15: <b>Lena is at R8C15</b>. Row 16 is Miriam’s at <b>R16C11</b> (R16C9 is in column 9, the bench R16C6 would need a woman in row 15 for Ophelia), so <b>Joanna is at R1C10</b> (columns 9, 11 and 12 are taken) and <b>Hermione at R9C5</b> (columns 6–10 are gone and R9C8 was refuted). Nicholas is at R12C16 or R15C16, Ophelia on the sofa R12C14 or the bench R15C14."},{"place":["O","N","D","V","C"],"cand":{"B":[[2,7],[3,6]],"E":[[2,7],[3,6],[11,8]],"G":[[3,6],[11,8]]},"text":"Left: Bernadette (R2C7, R3C6 or R13C1), Casimir (R3C6, R10C9, R13C1), Denise (R10C9, R11C8, R13C1, R14C2), Emmett and Gerald, Nicholas, Ophelia and Vladimir (R13C1 or R14C2). <b>Could Denise be at R11C8?</b> She is alone with a man: her opponent at R10C9 is a man and nobody else is in the Blitz Room – not Casimir (his opponent must be a man), not Emmett (he needs a man in his room), so Gerald. Gerald is south of Bernadette, so Bernadette is in the Café, and the Library’s second player is Casimir or Emmett. Ophelia needs a woman one row north of her: not on the bench R15C14 (row 14 would hold Vladimir or a man), so on the sofa R12C14, with Nicholas at R15C16. Casimir cannot play Bernadette, so he is in the Library and Emmett in the Café – where only Bernadette and Joanna are with him: no man. Contradiction, <b>Denise is not at R11C8</b>, and R11C8 belongs to Emmett or Gerald, both men. Ophelia on the sofa would need a woman in row 11, whose only usable square is R11C8 – so <b>Ophelia is on the bench R15C14</b> and <b>Nicholas at R12C16</b>. The woman one row north of Ophelia is at R14C2, the only usable square of row 14: not Bernadette (Gerald could not be south of her), so <b>Denise is at R14C2</b>, <b>Vladimir at R13C1</b>, and Denise, alone with him at the Library board, is his opponent. Bernadette is at the Café board (R13C1 is gone), so Casimir cannot face her: <b>Casimir is at R10C9</b>."},{"place":["B","G","E"],"cand":{},"text":"Bernadette sits at R2C7 or R3C6, her opponent – Emmett or Gerald – on the other square; Emmett and Gerald also share R11C8, Casimir’s opponent. <b>Could Bernadette be at R3C6?</b> Then her opponent is at R2C7, north of her – not Gerald, who is south of Bernadette – so Emmett, who needs a man in his room: the Café would hold Bernadette, Joanna and himself. Contradiction. <b>Bernadette is at R2C7</b>; Emmett cannot face her either (no man would be with him), so <b>Gerald is at R3C6</b> – south of Bernadette, beside no chair – and <b>Emmett at R11C8</b>, facing Casimir, the man with him. Everyone is placed."},{"final":true,"text":"Case closed: the top board in the Library was Vladimir against Denise, the correspondence champion – alone with him when the clocks were stopped. <b>Denise is the murderer!</b>"}],"solver":{"rules":[{"type":"obj_pairs","obj":"chessboard","pairs":4}],"occupiable":["chair","stool","bench","armchair","sofa"]},"verification":{"tool":"tools/murdoku_solver.py","unique":true,"guessFree":true,"checked":"2026-09-24"}}