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rakesh_rai
Posts: 774
  
Country : India | Guest - 2016-02-12 8:45 AM
>>>And also please give some starting clues for x sum frame 9*9 from IB.
IB X sum frame 9x9: C4R4 = 4 (singlet). Concentrate on C5... C5R4 and C5R6 must contain (2,6). So, R5C4 and R5C6 must contain (3,8). Also observe that, C3R4 = C7R6 = 8.
Can you explain how you got (2,6 ) and (3,8 ) ? |
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rakesh_rai
Posts: 774
Country : India | >>>And also please give some starting clues for x sum frame 9*9 from IB.
The starting approach has to be to find the possibilities for X, without forgetting classic rules.
For example, in the IB, if we look at column 6, the first three numbers can have three numbers from 3,5,8 and 9. So the possible values of X are 16, 17, 20 or 22.
Now look at row 6. The possible values for first three numbers are 2,6,7,8 and 9. Using these numbers, we cannot make 20. So X cannot be 20. Also, if X=16, then we need to have 2,6 and 8 as first three numbers. Then we cannot place any number in R6C5. So X cannot be 16 either.
The possible values for X are now 17 or 22.
Similarly, you can deduct that X cannot be 17 as it leads to a contradiction in Boxes 4/5/6.
Once X is identified as 22, there are only two ways to make 22 (589 or 679). You will be able to solve easily after that.
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harmeets
| harmeets posted @ 2016-02-12 11:11 AM >>>Can you explain how you got (2,6) and (3,8) ?
In column C5, the middle 3 numbers (in r4,r5,r6) must add up to 12. Two numbers are 4 and 2, so 3rd one must be 6.
Why the middle numbers add to 12? Because in C5, 1st 3 numbers (r1,r2,r3) = (45 - X - 12), and last 3 numbers (r7,r8,r9) = X. So middle 3 numbers = (45 - (45 - X - 12) - X) = 12.
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vopani
Posts: 739
Country : India | vopani posted @ 2016-02-12 4:03 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Many puzzles were worth too much or too little | |
Really nice sudokus! I was lost on both the Average sudokus... but otherwise it went smooth.
QuadMax 9x9 and X-Frame 9x9 were my favourites. Thanks Harmeet and Rakesh. |
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An LMI player
| An LMI player posted @ 2016-02-12 4:12 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Fairly Nice | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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marred
Posts: 12
Country : Poland | marred posted @ 2016-02-12 5:29 PM | How well did the variants represent the theme of the test ? | were not represented well | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Below Average | | | Which set of puzzles did you like the most? | Classic Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth too much or too little | |
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An LMI player
| An LMI player posted @ 2016-02-12 7:49 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Fairly Nice | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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An LMI player
| An LMI player posted @ 2016-02-12 10:13 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Fairly Nice | | | Which set of puzzles did you like the most? | X Sum Frame Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Many puzzles were worth too much or too little | |
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margareta456
Posts: 30
Country : Poland | | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | Consecutive Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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MrLiang
Posts: 44
Country : Thailand | MrLiang posted @ 2016-02-12 10:46 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | X Sum Frame Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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Swagatam
Posts: 45
Country : India | | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Average | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Many puzzles were worth too much or too little | |
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wgryciuk
Posts: 24
Country : Poland | | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | Consecutive Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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David McNeill
Posts: 63
Country : United Kingdom | | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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RameshLMI
Posts: 51
Country : India | | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | X Sum Frame Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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Vishal
Posts: 22
Country : India | Vishal posted @ 2016-02-13 5:14 PM | How well did the variants represent the theme of the test ? | representation could have been better | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Fairly Nice | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth too much or too little | |
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TiiT
Posts: 139
Country : Estonia | TiiT posted @ 2016-02-13 6:29 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Below Average | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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ghirsch
Posts: 102
Country : United States | ghirsch posted @ 2016-02-13 10:05 PM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | X Sum Frame Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
Thanks for another great test Rakesh and Harmeet. All of the puzzles I solved were very nice, but my favorites were QuadMax 2 and X Sum Frame 2 (I really liked the deductions for X in this one ). |
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gaurav.kjain
Posts: 52
Country : India | Really nice sudokus....Liked construction of all of them.
Hats off, Rakesh and Harmeet.
Kropki seems to be a no starter for me logically, Rakesh/Harmeet, please provide me THE logical starting point.
Technically for me 2015-16 SM is ended as, I will be co-authoring last round of SM along with Amit.
All the rounds were really great and I enjoyed them a lot. Thanks for the authors and organizers for all great SM rounds throughout the year.
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rakesh_rai
Posts: 774
Country : India | gaurav.kjain - 2016-02-13 11:14 PM
Kropki seems to be a no starter for me logically, Rakesh/Harmeet, please provide me THE logical starting point.
I guess you are referring to the 9x9.
(1 ) One starting point is R1C3/C4 -> one of them has to be 3. You can find out easily that the 3 must go in R1C4. You can then fill out all cells in row 1. R1C1 cannot be 5 (look at the long sequence in col 1 ) so it will be 1.
(2 ) R5C1 is even (count odd/even in box4 ). Using this, we can complete col 1, as there is only one place for the number 2.
After this, it should be simpler. |
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detuned
Posts: 152
Country : United Kingdom | detuned posted @ 2016-02-14 12:20 AM | How well did the variants represent the theme of the test ? | representation could have been better | | | What did you think about the puzzle quality of the test? | Fairly Nice | | | Which set of puzzles did you like the most? | Classic Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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kishy72
Posts: 419
Country : India | kishy72 posted @ 2016-02-14 1:16 AM | How well did the variants represent the theme of the test ? | representation could have been better | | | What was your opinion of the distribution of easy/hard puzzles? | Too many hard puzzles | | | What did you think about the puzzle quality of the test? | Fairly Nice | | | Which set of puzzles did you like the most? | QuadMax 4Odd 4Even | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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An LMI player
| An LMI player posted @ 2016-02-14 1:51 AM | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | X Sum Frame Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Many puzzles were worth too much or too little | |
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forcolin
Posts: 172
Country : ITALY | The puzzles were all right but the point distribution was rather poor. IMHO for the big kropki 16 points were faaaaaar too many, while the big average with only 13 points was underrated. |
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gaurav.kjain
Posts: 52
Country : India | rakesh_rai - 2016-02-13 11:54 PM gaurav.kjain - 2016-02-13 11:14 PM
Kropki seems to be a no starter for me logically, Rakesh/Harmeet, please provide me THE logical starting point.
I guess you are referring to the 9x9. (1 ) One starting point is R1C3/C4 -> one of them has to be 3. You can find out easily that the 3 must go in R1C4. You can then fill out all cells in row 1. R1C1 cannot be 5 (look at the long sequence in col 1 ) so it will be 1. (2 ) R5C1 is even (count odd/even in box4 ). Using this, we can complete col 1, as there is only one place for the number 2. After this, it should be simpler. Thanks a lot Rakesh, I really forgot to use Even/Odd marking , it makes it so easy which was looking a non starter to me , I remember Prasanna also mentioned it earlier. |
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neerajmehrotra
Posts: 329
Country : India | | How well did the variants represent the theme of the test ? | variations represented the theme well | | | What was your opinion of the distribution of easy/hard puzzles? | Just right | | | What did you think about the puzzle quality of the test? | Very nice | | | Which set of puzzles did you like the most? | Kropki Sudoku | | | Of the puzzles you solved/attempted, how well did the point values reflect the difficulty? | Most puzzles were worth the right amount | |
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@ 2016-02-12 8:59 AM (#20964 - in reply to #20963) (#20964) Top