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Posts: 9 Country : China | Leaf Card posted @ 2010-03-01 7:44 AM maybe because of the missing in vx sudoku, all the reply above are discussing variants, could you give me some reply for classic sudoku. like we metion in IB, all the puzzles are low level technology, 1-6 solvable by singles, 7 solvable by pointing, others need pair triplet and xwing, introduced in many japanese sudoku books. and we alse do some work on guessing part for 7-10. let me show you the analysis by sudoku explainer(a sudoku analysis software) Analyzing Sudoku #1 59 Hidden Single Hardest technique: Hidden Single Difficulty: 1.2 Analyzing Sudoku #2 57 Hidden Single Hardest technique: Hidden Single Difficulty: 1.5 Analyzing Sudoku #3 57 Hidden Single Hardest technique: Hidden Single Difficulty: 1.5 Analyzing Sudoku #4 51 Hidden Single 5 Direct Hidden Pair 1 Naked Single Hardest technique: Naked Single Difficulty: 2.3 Analyzing Sudoku #5 50 Hidden Single 3 Direct Hidden Pair 4 Naked Single Hardest technique: Naked Single Difficulty: 2.3 Analyzing Sudoku #6 50 Hidden Single 1 Direct Pointing 3 Direct Hidden Pair 3 Naked Single Hardest technique: Naked Single Difficulty: 2.3 Analyzing Sudoku #7 48 Hidden Single 1 Direct Pointing 6 Direct Hidden Pair 2 Direct Hidden Triplet 4 Pointing Hardest technique: Pointing Difficulty: 2.6 Analyzing Sudoku #8 51 Hidden Single 4 Direct Hidden Pair 2 Naked Single 4 Pointing 1 Claiming 2 Naked Pair 1 X-Wing Hardest technique: X-Wing Difficulty: 3.2 Analyzing Sudoku #9 53 Hidden Single 2 Direct Hidden Pair 1 Naked Single 1 Direct Hidden Triplet 6 Pointing 1 Claiming 1 Hidden Pair 1 Naked Triplet Hardest technique: Naked Triplet Difficulty: 3.6 Analyzing Sudoku #10 57 Hidden Single 1 Direct Hidden Pair 1 Direct Hidden Triplet 12 Pointing 2 Claiming 9 Naked Pair Hardest technique: Naked Pair Difficulty: 3.0 we know players like to get more score puzzles first, so we put the puzzle seems easier at last with high score. compare with your step and analysis, maybe you will have a new feeling with the ten puzzles, and i wonder someone can tell us your feeling, or you solve time for every puzzle, if all puzzles according with the theme metioned in IB, or something you want to tell us. thank you! :) |
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Posts: 45 ![]() ![]() Country : India | adityasaraf007 posted @ 2010-03-01 11:22 AM mtronic - 2010-02-28 9:08 PM adityasaraf007 - 2010-02-28 8:44 PM Average Sudoku Average Sudoku did not have a unique solution: 324 157 698 615 298 734 987 364 125 241 689 573 536 742 981 879 513 246 193 425 867 762 831 459 458 976 312 4 & 8 in Boxes 8 & 9 can be interchanged among themselves. Please correct me if I am wrong. On the 7th line ... 2-5-8 would mean, that there is horizontal line over 5. So they can't be this way, only the other position is correct. Thanks for correcting me. I thought that the converse might not be true, so I didn't check for that. |
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Posts: 349 ![]() ![]() ![]() ![]() ![]() Country : India | amitsowani posted @ 2010-03-01 12:54 PM Thanks for the awesome analysis. Nice way to rate the classics. I think all the techniques that you have used are absolutely acceptable in competitive sudokus. These techniques can be identified by participants without breaking their head too much or being tempted to resort to trial and error. :) |
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![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Country : India | debmohanty posted @ 2010-03-01 2:06 PM score / Results has been updated to show the split between Round1 and Round2. Couple of observations 1. The average score in Round1 is much higher than average score in Round2. So, probably Round2 should have been longer. 2. Many players didn't attempt Round2. (so, either many players are just interested in Classics OR some players gave up after finding Round1 little tough) Only Zafer completed Round1 with 4 minutes of bonus time. So really a good show from considering many other good players solved only 5-7 in Round1 |
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Posts: 774 ![]() ![]() ![]() ![]() ![]() ![]() Country : India | rakesh_rai posted @ 2010-03-01 7:54 PM As already noted, scores in this mock are very low, implying that the test became tougher than it was perhaps planned by the organisers. We can perhaps infer that two short 50 minute formats can work well in an offline competition, but it is not optimal for online contests. Round 1: Two contestants completed all 10. So timing wise, it was planned ok. If we use the grades from scanraid, we arrive at the following: 1 119 moderate 2 126 moderate 3 101 moderate 4 82 moderate 5 106 moderate 6 84 moderate 7 154 tough 8 306 tough 9 166 tough 10 194 tough I am not sure about the accuracy of this system but this does imply that the 20 pointer was tougher than the 40 and 50 pointers. And the 90 pointer was not tougher than the 70 pointer. In fact, classic 8 was attempted by the least number of contestants (another reason could be that it is difficult to reach to number 8, whether you start from 1 or 10). But overall, the points distibution was good as all "moderate"s had less points than "tough"s. Round II: Consecutive sudoku was nice with logical steps needed to proceed. Thats the only one I can comment on since I got stuck in most others I tried, and solved diagonal the hard way. Here, we probably tried to fit in more sudokus than the alloted time. In 50 minutes, 5 or 6 sudokus (of the level in the mock) would have been perfect. The main regret is that most participants were unable to even try out a majority of sudokus. Another reason for people skipping round 2 could be the rigid "20 minute gap" constraint between the rounds. If the two rounds were independent, we would have seen more scores in round 2. |
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Posts: 148 ![]() ![]() ![]() Country : France | Ours brun posted @ 2010-03-02 7:53 PM I had some informatic problems during round 1 so I could try only the easier puzzles, which were very pleasant to solve. I think 50' was a good timing for this round. Then I tried round 2 but did mistake on mistake and so I decided to stop playing and relax. :bleh: I came back on the puzzles later, and my impression is that puzzles were globally hard, and some really tough. It would have been great to have the round last about one hour and a half. Finally, the 20' break between the two rounds didn't bother me. |
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Posts: 25 ![]() Country : United States | cnarrikkattu posted @ 2010-03-03 4:54 AM I would be a bit careful about relying on scanraid ratings for human solving. It doesn't seem to correspond too well with actual testing. For example, see Nick Baxter's remarks about the USSC puzzles here (and from direct experience, the 3rd puzzle of the third round was pretty much the toughest one of the bunch). |
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Posts: 148 ![]() ![]() ![]() Country : France | Ours brun posted @ 2010-03-03 7:25 PM I agree with this, Scanraid's ratings are sometimes far away from what we could expect. Of course every software will sometimes deliver "strange" scores according to us, but Sudoku Explainer is generally considered more reliable. Anyway I didn't try the tough puzzles yet, so I can't tell about my own experience... |