I would like to invite you to participate in the sixth Serbian Open Championship in solving optimizer puzzles. Competition will start on Friday, November 29th. The puzzles will be available for download on website http://puzzleserbia.rs.
This year there will be only one competition week and 3 puzzles with separately point system. All other details will be published in the contest file.
I could not see an English version of the rules, so I will post one here. Nikola, please confirm if this looks correct to you?
Puzzle 1: Nanro
Normal Nanro rules. Choose one of the multiple solutions.
Score: 1 point for every digit used that is not a "2". Maximize your score.
Puzzle 2: Pentominoes
Fit the 12 pentominoes into the grid. They cannot touch each other, not even diagonally. They can be rotated and reflected.
Score: For each row and column, multiply the lengths of the white (=non-pentomino) blocks together. Then sum these 26 values together. Maximize your score.
Transfer to Puzzle 3:
In the left half (13x13) of the final grid, highlight all fields that correspond to a digit "2" in your solution to puzzle 1.
In the right half (13x13) of the final grid, highlight all fields that correspond to a pentomino in your solution to puzzle 2 (and also that are not on the border of puzzle 2).
Puzzle 3: Letter Pairs
Place some or all of the given words into the grid so that they read either across (left to right) or down (top to bottom), without crossing or overlapping each other. Ignore space characters in the word list, only A-Z characters are used. [2013 is the International Year of Water Cooperation.] A 'letter pair' is formed when the same letter appears in two adjacent cells. But there must be no groups containing three or more of the same letter connected together, anywhere in the grid.
Score: Each letter pair is worth 1 point, but if either cell of the letter pair is highlighted then that letter pair is worth 2 points instead. Maximize your score.
For puzzles 1 and 2, the best ten scores are awarded 12, 10, 9, 8, 7, 6, 5, 4, 3, and 2 points. Any other correct solution will be awarded 1 point.
For puzzle 3, the best ten scores are awarded 18, 16, 14, 12, 10, 8, 6, 4, 3, and 2 points. Any other correct solution will be awarded 1 point.
The winner is the contestant that gets the highest total of these three numbers. If there is a tie, the better score in puzzle 3 wins, and if that is equal too then the earliest submission will win.
Please be careful when sending solutions. In the event that a solution does not meet one of the rules for that puzzle, your score will be 0.
Scan your solution, or enter the numbers, letters and pentomino colours into the supplied Word file. In the accompanying text make sure to include your name, country and the scores achieved for each task. Send to the email address email@example.com no later than Sunday 8th December at 22.00 Central European Time. Have fun!
Hmmm, this is going to be complex. Sacrifising points in puzzle 1 by writing more 2's than necessary can get you more points in puzzle 3. It might even be the case for puzzle 2, but I think it's harder to work that there. And puzzle 3 is worth more points in the final rankings. I don't know if that's a good thing, considering you have no clue where you are in the rankings, so you have no idea if you are doing good enough.
We have 24 participants from 9 countries. Some problems with e-mail address are noticed so here is a list of names in submission order. Please let me know if your name is not on the list as soon as possible.
Participants: Mihajlo Dzudzar, Cedomir Milanovic, Dragan Stojanovic, Rakesh Rai, Branko Ceranic, Milovan Kovacevic, Victor Boiko, Davor Gavranovic, Gerhard Richter, Tomoaki Tokunaga, Matus Demiger, Dejan Spasic, Harmeet Singh, Anuraag Sahay, Rauno Parnits, Jovan Novakovic, Ravi Kumar Macherla, Petar Parlic, Marko Obradovic, Zoran Tanasic, Rade Goljovic, Urmas Raude, Kresimir Stracenski and Danijel Milosevic.