{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2025-12-14T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":45238,"title":"Checkmate","description":"* The positions of different chess pieces are given in a cell  *p* . \r\n* The position of the king is given as *x*\r\n\r\nDetermine if the opponent king is in check for individual scenerios.\r\n\r\n* x='Kg7'\r\n* p={'Qe5','Qg5','Qb5','Qa7'}\r\n\r\noutput= [1,1,0,1]\r\n\r\nN.b.any invalid position should produce 0.\r\nu may imagine p as the white pieces and x as the black king for clarity.","description_html":"\u003cul\u003e\u003cli\u003eThe positions of different chess pieces are given in a cell  \u003cb\u003ep\u003c/b\u003e .\u003c/li\u003e\u003cli\u003eThe position of the king is given as \u003cb\u003ex\u003c/b\u003e\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eDetermine if the opponent king is in check for individual scenerios.\u003c/p\u003e\u003cul\u003e\u003cli\u003ex='Kg7'\u003c/li\u003e\u003cli\u003ep={'Qe5','Qg5','Qb5','Qa7'}\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eoutput= [1,1,0,1]\u003c/p\u003e\u003cp\u003eN.b.any invalid position should produce 0.\r\nu may imagine p as the white pieces and x as the black king for clarity.\u003c/p\u003e","function_template":"function y=checkmate(x,p)\r\n  y = x;\r\nend","test_suite":"%%\r\nx='Kg7';\r\np={'Qe5','Qg5','Qb5','Qa7'}\r\ny_correct = [1,1,0,1];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Kg7';\r\np={'Qe5','Rg5','Bb5','Na7','h6'}\r\ny_correct = [1,1,0,0,1];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Ka3';\r\np={'Qe5','Rg5','Bb5','Na7','h6'}\r\ny_correct = [0,0,0,0,0];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Ka3';\r\np={'a2','Rg5','Be7','Nc4','Nb1'}\r\ny_correct = [0,0,1,1,1];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Ka3';\r\np={'a2','Rg5','Be7','Nc5','Kb2'}\r\ny_correct = [0,0,1,0,0];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Kf2';\r\np={'Ra2','Rg5','Bh4','Bg1','Nd3','Kf3','Ng1','e1','Qg4','Qf7'}\r\ny_correct = [1,0,1,1,1,0,0,0,0,1];\r\nassert(isequal(checkmate(x,p),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":5,"created_by":363598,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2019-12-21T00:09:28.000Z","updated_at":"2026-01-23T12:59:27.000Z","published_at":"2019-12-21T00:12:53.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe positions of different chess pieces are given in a cell \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ep\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e .\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe position of the king is given as\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ex\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eDetermine if the opponent king is in check for individual scenerios.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ex='Kg7'\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ep={'Qe5','Qg5','Qb5','Qa7'}\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eoutput= [1,1,0,1]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eN.b.any invalid position should produce 0. u may imagine p as the white pieces and x as the black king for clarity.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":45239,"title":"Checkmate-02","description":"This is an extension of the problem \u003chttps://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\u003e\r\n\r\nIf the king is in check, examine the next move of the king. List all those possible moves by which king can avoid the check by the next move.\r\n\r\nOtherwise 'checkmate'.\r\n\r\n* r = king's location\r\n* p = position of opponent's pieces\r\n\r\n* if the king is currently not in check, then he doesn't need to move. so return empty. \r\n\r\n* for simplicity, assume that the king cannot take out opponent's pieces.\r\n","description_html":"\u003cp\u003eThis is an extension of the problem \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\"\u003ehttps://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\u003c/a\u003e\u003c/p\u003e\u003cp\u003eIf the king is in check, examine the next move of the king. List all those possible moves by which king can avoid the check by the next move.\u003c/p\u003e\u003cp\u003eOtherwise 'checkmate'.\u003c/p\u003e\u003cul\u003e\u003cli\u003er = king's location\u003c/li\u003e\u003cli\u003ep = position of opponent's pieces\u003c/li\u003e\u003c/ul\u003e\u003cul\u003e\u003cli\u003eif the king is currently not in check, then he doesn't need to move. so return empty.\u003c/li\u003e\u003c/ul\u003e\u003cul\u003e\u003cli\u003efor simplicity, assume that the king cannot take out opponent's pieces.\u003c/li\u003e\u003c/ul\u003e","function_template":"function pos=checkmate_2(r,p)\r\n  y = x;\r\nend","test_suite":"%%\r\nr = 'Kd4';\r\np={'Qe3','Rh3','Nc1','c6'};\r\npos = {'Kd5','Kc4'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kg6';\r\np={'Qe3','Rh3','Nc1','c6','Ke7'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kc8';\r\np={'Qe3','Rh3','Nc1','c6','Ke7','h5','Ba6'};\r\npos = {'Kc7','Kb8'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kh1';\r\np={'Qa3','Rb3','Nf2','c6','Kf7','h5','Ba6'};\r\npos = {'Kh2','Kg2','Kg1'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kg6';\r\np={'Qe3','Rh3','Nc1','c6'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kd4';\r\np={'Rh2','Na1','d1'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kb2';\r\np={'Na2','Na1','Na3'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kb2';\r\np={'Na2','Na1','Na3','c1','c3'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kb2';\r\np={'Na2','Na1','Na3','Bg7' };\r\npos = 'checkmate';\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kg6';\r\np={'Nf5','Rg1','g4','Qe2','Bf1','Kc3' };\r\npos =  {'Kh7','Kf7','Kf6'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Ka1';\r\np={'Qa3','Rb3','Nf2','c6','Kf7','h5','Ba6'};\r\npos =  'checkmate';\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nfiletext = fileread('checkmate_2.m');\r\nassert(isempty(strfind(filetext, 'regexp')),'regexp() forbidden')\r\nassert(isempty(strfind(filetext, 'regexprep')),'regexprep() forbidden')\r\nassert(isempty(strfind(filetext, 'strfind')),'strfind() forbidden')\r\nassert(isempty(strfind(filetext, 'strcmp')),'strcmp() forbidden')\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":14,"created_by":363598,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":10,"test_suite_updated_at":"2019-12-29T04:16:28.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2019-12-21T01:40:07.000Z","updated_at":"2026-01-23T13:22:55.000Z","published_at":"2019-12-21T21:38:46.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis is an extension of the problem\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026lt;https://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026gt;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf the king is in check, examine the next move of the king. List all those possible moves by which king can avoid the check by the next move.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOtherwise 'checkmate'.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003er = king's location\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ep = position of opponent's pieces\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eif the king is currently not in check, then he doesn't need to move. so return empty.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003efor simplicity, assume that the king cannot take out opponent's pieces.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" 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.\u003c/li\u003e\u003cli\u003eThe position of the king is given as \u003cb\u003ex\u003c/b\u003e\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eDetermine if the opponent king is in check for individual scenerios.\u003c/p\u003e\u003cul\u003e\u003cli\u003ex='Kg7'\u003c/li\u003e\u003cli\u003ep={'Qe5','Qg5','Qb5','Qa7'}\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eoutput= [1,1,0,1]\u003c/p\u003e\u003cp\u003eN.b.any invalid position should produce 0.\r\nu may imagine p as the white pieces and x as the black king for clarity.\u003c/p\u003e","function_template":"function y=checkmate(x,p)\r\n  y = x;\r\nend","test_suite":"%%\r\nx='Kg7';\r\np={'Qe5','Qg5','Qb5','Qa7'}\r\ny_correct = [1,1,0,1];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Kg7';\r\np={'Qe5','Rg5','Bb5','Na7','h6'}\r\ny_correct = [1,1,0,0,1];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Ka3';\r\np={'Qe5','Rg5','Bb5','Na7','h6'}\r\ny_correct = [0,0,0,0,0];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Ka3';\r\np={'a2','Rg5','Be7','Nc4','Nb1'}\r\ny_correct = [0,0,1,1,1];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Ka3';\r\np={'a2','Rg5','Be7','Nc5','Kb2'}\r\ny_correct = [0,0,1,0,0];\r\nassert(isequal(checkmate(x,p),y_correct))\r\n\r\n%%\r\nx='Kf2';\r\np={'Ra2','Rg5','Bh4','Bg1','Nd3','Kf3','Ng1','e1','Qg4','Qf7'}\r\ny_correct = [1,0,1,1,1,0,0,0,0,1];\r\nassert(isequal(checkmate(x,p),y_correct))","published":true,"deleted":false,"likes_count":3,"comments_count":5,"created_by":363598,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2019-12-21T00:09:28.000Z","updated_at":"2026-01-23T12:59:27.000Z","published_at":"2019-12-21T00:12:53.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe positions of different chess pieces are given in a cell \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ep\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e .\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe position of the king is given as\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:b/\u003e\u003c/w:rPr\u003e\u003cw:t\u003ex\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eDetermine if the opponent king is in check for individual scenerios.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ex='Kg7'\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ep={'Qe5','Qg5','Qb5','Qa7'}\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eoutput= [1,1,0,1]\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eN.b.any invalid position should produce 0. u may imagine p as the white pieces and x as the black king for clarity.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"},{"id":45239,"title":"Checkmate-02","description":"This is an extension of the problem \u003chttps://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\u003e\r\n\r\nIf the king is in check, examine the next move of the king. List all those possible moves by which king can avoid the check by the next move.\r\n\r\nOtherwise 'checkmate'.\r\n\r\n* r = king's location\r\n* p = position of opponent's pieces\r\n\r\n* if the king is currently not in check, then he doesn't need to move. so return empty. \r\n\r\n* for simplicity, assume that the king cannot take out opponent's pieces.\r\n","description_html":"\u003cp\u003eThis is an extension of the problem \u003ca href = \"https://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\"\u003ehttps://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\u003c/a\u003e\u003c/p\u003e\u003cp\u003eIf the king is in check, examine the next move of the king. List all those possible moves by which king can avoid the check by the next move.\u003c/p\u003e\u003cp\u003eOtherwise 'checkmate'.\u003c/p\u003e\u003cul\u003e\u003cli\u003er = king's location\u003c/li\u003e\u003cli\u003ep = position of opponent's pieces\u003c/li\u003e\u003c/ul\u003e\u003cul\u003e\u003cli\u003eif the king is currently not in check, then he doesn't need to move. so return empty.\u003c/li\u003e\u003c/ul\u003e\u003cul\u003e\u003cli\u003efor simplicity, assume that the king cannot take out opponent's pieces.\u003c/li\u003e\u003c/ul\u003e","function_template":"function pos=checkmate_2(r,p)\r\n  y = x;\r\nend","test_suite":"%%\r\nr = 'Kd4';\r\np={'Qe3','Rh3','Nc1','c6'};\r\npos = {'Kd5','Kc4'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kg6';\r\np={'Qe3','Rh3','Nc1','c6','Ke7'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kc8';\r\np={'Qe3','Rh3','Nc1','c6','Ke7','h5','Ba6'};\r\npos = {'Kc7','Kb8'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kh1';\r\np={'Qa3','Rb3','Nf2','c6','Kf7','h5','Ba6'};\r\npos = {'Kh2','Kg2','Kg1'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kg6';\r\np={'Qe3','Rh3','Nc1','c6'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kd4';\r\np={'Rh2','Na1','d1'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kb2';\r\np={'Na2','Na1','Na3'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kb2';\r\np={'Na2','Na1','Na3','c1','c3'};\r\npos = [];\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kb2';\r\np={'Na2','Na1','Na3','Bg7' };\r\npos = 'checkmate';\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Kg6';\r\np={'Nf5','Rg1','g4','Qe2','Bf1','Kc3' };\r\npos =  {'Kh7','Kf7','Kf6'};\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nr = 'Ka1';\r\np={'Qa3','Rb3','Nf2','c6','Kf7','h5','Ba6'};\r\npos =  'checkmate';\r\nassert(isequal(checkmate_2(r,p),pos))\r\n\r\n%%\r\nfiletext = fileread('checkmate_2.m');\r\nassert(isempty(strfind(filetext, 'regexp')),'regexp() forbidden')\r\nassert(isempty(strfind(filetext, 'regexprep')),'regexprep() forbidden')\r\nassert(isempty(strfind(filetext, 'strfind')),'strfind() forbidden')\r\nassert(isempty(strfind(filetext, 'strcmp')),'strcmp() forbidden')\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":14,"created_by":363598,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":10,"test_suite_updated_at":"2019-12-29T04:16:28.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2019-12-21T01:40:07.000Z","updated_at":"2026-01-23T13:22:55.000Z","published_at":"2019-12-21T21:38:46.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis is an extension of the problem\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026lt;https://www.mathworks.com/matlabcentral/cody/problems/45238-checkmate\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026gt;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf the king is in check, examine the next move of the king. List all those possible moves by which king can avoid the check by the next move.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOtherwise 'checkmate'.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003er = king's location\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003ep = position of opponent's pieces\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eif the king is currently not in check, then he doesn't need to move. so return empty.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"1\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003efor simplicity, assume that the king cannot take out opponent's pieces.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" 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