Calcudoku puzzle forumhttps://www.calcudoku.org/forum/ Step by step solution of an 9x9https://www.calcudoku.org/forum/viewtopic.php?f=3&t=120 Page 1 of 1

 Author: jomapil  [ Wed Nov 30, 2011 6:35 pm ] Post subject: Step by step solution of an 9x9 I beg your goodwill to the presentation of this puzzle. It's my first one and also the first contact with the tools used. Anyway I thank for your critiques,opinions, alternative steps and suggestions.I limited the most the text and pretended that the "step by step" was exactlya "step by step" exhaustive and complete for other begginers (save the obvious).I advise the eventual interested to draw the diagram and to accompany, writingeverything on the paper.And now, as almost always, I'm sorry for my English ( To write this text I consulted the dictionary 8 times ). Uploaded with [url=http://www.calcudoku.org/im/forum/img_f3_t120_p998_i1.png]ImageShack.us[/url]1) green2) yellow: "192*"=[4,6,8]3) brown: "1008x"=[2,7,8,9]4) blue5) grey: "252*"=[1,4,7,9]Uploaded with [url=http://www.calcudoku.org/im/forum/img_f3_t120_p998_i1.png]ImageShack.us[/url]6) green: Analysing row 6 : "48*"<<>>7, "2880x"<<>>7 --> e1=7. "280*"=[1,5,7,8],[2,4,5,7]. "48#"=[2,3,8],[3,4,4]. Analysing column 8 --> h6=9. Analysing row 6 --> b6=7.7) yellow: h5=1 --> c5=8,c4=1. "4-"(a4)=[2,3,9],[1,4,9]. c4=1 -->"4-"=[2,3,9]. "2-"=[2,4],[3,5]. a6=2,3,4,8, i6=2,3,4,8.8) brown: "2880x"=[1,5,8,8,9],[2,4,5,8,9].9) "6-"=[1,7],[2,8]. h7=8 and i7=1 --> "2880x"<<>>[1,5,8,8,9] --> "2880x"=[2,4,5,8,9].10) There should be a 8 in the column h of "192x" and in the column i of "2880x", i.e. "192x"(hhhh) and "2880x"(iiii) or vice versa. Then, all the other 8s of those columns must disappear. So h9<>8, i9<>8 --> g9=8. Uploaded with [url=http://www.calcudoku.org/im/forum/img_f3_t120_p998_i1.png]ImageShack.us[/url] 11) In the column i it lacks (1,3). So "4-"(i2)=[x,1],[x,3] --> "4-"(i2)=[1,5],[3,7] and "4-"(i2)(+)=[6,10]. (h+++)+(i+++)= 45+45= 90. Knowing the sum of all the cages of the two columns, "2880x"(+)=2+4+5+8+9=28 and so on, we have: 85 + "4-"(i2)(+) + h2 - g9=90 --> h2 + "4-"(i2)(+) = g9 +5 "4-"(i2)(+)=[6,10]. If (4-)(i2)(+) = 6 --> h2=7 unique possibility If (4-)(i2)(+) = 10 --> h2=3 impossible After this h2=7, g2=5, [f1,g1]=[2,4].Uploaded with [url=http://www.calcudoku.org/im/forum/img_f3_t120_p998_i1.png]ImageShack.us[/url]12) green: h9=2, i9=7, h7=5 e5=5 --> f5=3, d5<>3 --> d5=[2,4] --> d6=[2,3,8], e6=[2,4,8], h1=[6,8]. 13) yellow: i4=6 --> h3=[4,8] --> h1=6. i1=3 --> "4-"(i2)=[1,5] --> i2=1, i3=5. a=[7], b=[7] --> e1=7. "16+"=[7,1,8],[7,2,7],[7,3,6],[7,4,5] __> e2=3,f2=6, a2=9, b2=8, d2=2 -- > "48x"=[4,3,4], a6=[2,8], i6=[2,8] g8=[4,7] --> g1=2, f1=4, b1=1, a1=8. Uploaded with [url=http://www.calcudoku.org/im/forum/img_f3_t120_p998_i1.png]ImageShack.us[/url]14) green: a6=2, i6=8, i7=[2,4], a4=3, b4=2, b8=5, b9=4, f9=1, f8=[4,7] --> c8=2, c7=7.15) yellow: "112x"=[1,2,7,8] --> d3=7, e3=1, e4=8 --> f4=4, f3=8 --> g4=7, g8=4, f8=7. f=[...,2,8,9,...] --> "0-"=[2,9], f7=8, f6=2, i7=4, "252x"=[1,2,3,6,7] --> a6=2, b7=3, a7=6, a8=1, a4=3, e8=6. To complete now the puzzle, it is very simple. The hardest of this puzzle is the number 11). If anyone uses a different method I wolud like to know.

 Author: honkhonk  [ Wed Nov 30, 2011 7:57 pm ] Post subject: Re: Step by step solution of an 9x9 Quite a walkthrough jomapil! It's nice to have look at other solver's strategies...About step 11, You write column i lacks [1,3], this is true but also the columns h and i lack a 6 (image 2). Based on the information in that image 6 can only be in either h1 or i1, hence "9+"=[6,3]. Thus "4-"<> [7,3] but only "4-"=[1,5].If I have correctly followed your walkthrough, does this help?

 Author: jomapil  [ Thu Dec 01, 2011 12:55 am ] Post subject: Re: Step by step solution of an 9x9 Good point and thank you, Honkhonk.It's good to see other solutions, because they teaches us more tricks.I hope more variations on my solution.

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