Sudoku GP 2020

Round 3 results available.

The 4th round guide is out. Organizer: Czech Republic. https://gp.worldpuzzle.org/content/instruction-booklet

I definitely recommend solving the first 6, then 13 irregular (for those who think that a special shape is suitable) and then the hashtag could be something that is a bit similar to diagonal sudoku. Both also give a lot of points. But tasks 7, 8 and 9 are definitely also manageable. 7. Parity sudoku. I recommend marking which ones are even and which ones are odd. Since it is a simple task, it is possible that it is possible to define the different lines from the start and then immediately write down the variants (even or odd, respectively) and then simply continue solving. 8. Tic-Tac-Toe winner sudoku. Mark the even-even field. Even numbers can only form a row when they are on the diagonal. Be careful not to create more than one row of 3. 9. One touch sudoku. NB! Where there is no circle, there must not be the same numbers diagonally together. So in this sense, it is an untouch sudoku. I recommend first counting how many circles there are and if you find a pair, mark it and write down which number you have already matched. 10. Box sequence sudoku. If there is no gray line, then there must be no 3 consecutive numbers. This must be kept in mind often and it helps a lot. NB! If the gray line does not pass through the middle square of a 3x3 box, then there must be either 1 or 9. 11. Makodoku x is when there are pairs: 1x(2-9 all numbers) 2x3 2x4 is when there are pairs: 2 5 2 6 2 7 3 4 3 5 3 6 4 5 At first, you can probably place the numbers 1. Then you have to watch to see if there are any multiplication signs anywhere. Then start solving pluses and write down, for example, variants. You could also observe that if a small number is found somewhere where there is no sign, then there must be a large number next to it. For example, if there is no x or sign next to 2, then there must be 8 or 9. 12 Clock faces. At first, you need to look for places where there are two dots of the same color next to each other. In this case, the numbers must be increasing around both dots at the same time. Write out the variants there and it will probably start to branch. The example problem is very, very difficult. I recommend looking for another problem to practice. 14. Hashtag sudoku A bit like diagonal sudoku. I recommend solving it. The example problem is very difficult. The competition problem is probably easier. 15. Palindrome sudoku Mark out the middle of all lines and, for example, every 5th, 10th, etc. square at both ends of long lines. Then, if it doesn't branch out, I recommend starting to write out the variants by looking at both squares at the same time, where the same number must go. 16. Delimited kropki sudoku This problem is probably a monster (considering how many points it gives). I don't recommend solving it unless you are very good at solving kropki. It is important to note that this sudoku lacks kropki rules in those places where there is no gray line. And if there is a gray line and no dots, then there cannot be consecutive numbers or numbers with a difference of 2x. However, for the vast majority, I sincerely recommend not trying this problem at all. There are enough good problems to solve here and among the remaining problems there should not be any monsters that are very difficult.

The results of the 4th round are in. They are available here: https://gp.worldpuzzle.org/content/preliminary-results-wpf-gp-sudoku-4 I'll also add a table. This time I'll try the jpg format, see if anything changes. Quite a few Estonians managed to get a good result this time compared to the previous results. The results that will definitely be taken into account are made green.

The instructions for round 5 are available. Available here: https://gp.worldpuzzle.org/content/instruction-booklet The host country is India

I'll write some suggestions here on how to approach a task. 6. Anti-diagonal, 7 Thermo and 8 Arrow are described in round II. 9. Rossini It's worth remembering here that if no arrow is given, then there can be no consecutive numbers. Usually, it's good to start by solving the numbers 1 and 9, and then 2 and 8, etc. Sometimes there may be several arrows on different sides in a corner somewhere, so that an increasing sequence is created. From there, the task usually starts to branch out. 10. Triple sum Start solving by writing the first number in each row. It's probably possible to get some of the numbers right. Then it's a good idea to add all the ones together, because if you add 3 numbers, the last number must be the same as adding all the last digits of the three numbers together. Next, it's wise to count the hundreds. Usually, there's no need to calculate the tens - I usually figure out the sudoku myself first. You may also need to add up the tens to place the last 4 or 6 digits. NB! Don't forget to count the ones (for example, if the ones are 5,6 and 7, then this adds one to the tens) 11. Fortress is described in round III 12. Odd Even Count In the corner, you can only put 1,2,3 In the edge, you can only put 1,2,3,4,5. If the cell in the edge is located so that all 5 digits are in the same 3x3 box, then the number 5 cannot be there. In general, solve those circles where some digits are already given and it is possible to exclude some numbers. Since the task is the most expensive, I recommend skipping it for now. There are enough tasks to solve. 13. Three lines Here you need to be able to solve all three task types and having a good feeling for solving these tasks will help a lot. I also recommend avoiding this. If you leave out the last two tasks, there will still be enough points left to solve and it is possible to get a very good result. Good luck!

For algae!

Seekord oli neid, kes ei saanud eriti head tulemust, kui ka neid kes tegid senini parima tulemuse. Üldiselt vist oli üsna keeruline voor.

Ametlikud tulemused väljas.
Miskipärast ma ei saanud siia tabelit panna (Request entity too long) või mingi selline error tuli. Uurin ja püüan ka tabeli ikkagi lisada.

I tried to make a table into a pdf. Hopefully it works.

I'll write here again some tricks to use when solving. I've described Rossini here before, I won't write it again. 8. Online sudoku Here it's worth trying to find lines that go over the thick line and see if there is a line somewhere in the neighboring box where one of the numbers must definitely be represented. From there you can start excluding. If there's no way to branch, then there's a completely different option to try somewhere and then you'll probably quickly see whether it's correct or not. 10. Between sudoku 1 and 9 cannot be placed on the line. It's worth writing out some options in each circle and then seeing if it's not possible to put some numbers there. 11. Odd Even Bridge sudoku At the beginning, count all the lengths of the lines. If the length of the line is an even number, then both circles have either even numbers or both circles have odd numbers. Also, if the length of the line is 5, for example, there aren't many options. Numbers greater than 5 cannot be written in the circle. It is possible that you also have to mark even and odd numbers here. For example, if the length of the line is 13 and if there is, for example, 7 in one circle, then there can only be 6 or 7 in the second circle. However, if, for example, there cannot be either 6 or 7 in the second circle, then neither can be in the first circle. 12. Diagonally consecutive Sudoku It is very important to realize here that in places where there is no line, there cannot be consecutive numbers. This is a rather complex variant, which also gives more points. This can be a rather time-consuming sudoku. I recommend other difficult tasks rather than doing anything else. 13. Frame Sudoku It is worth looking for those rows/columns/boxes where, for example, two sums have already been given. Then it is possible to calculate the third. The sum of all numbers in one row/column/box is 45. In general, however, this is a kind of sudoku where you mark out the variants and then, once the variants have been marked out, you have to play through each box row by row to see which variants are possible. Considering that it scores 104 points, it's probably a monster.