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Posts: 4
Location: Russia | %D0%9F%D1%80%D0%BE%D1%88%D1%83+%D0%B0%D0%B4%D0%BC%D0%B8%D0%BD%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0+%D0%9E%D0%A2%D0%9C%D0%95%D
2%D0%BE%D1%80%D0%B0+%D0%9E%D0%A2%D0%9C%D0%95%D0%9D%D0%98%D0%A2%D0%AC+%D0%BC%D0%BE%D1%8E+%D0%B7%D0%B0%D1%8F%D0%B2%D0%BA%D1%83%2E
%D0%B7%D0%B0%D1%8F%D0%B2%D0%BA%D1%83%2E
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1907
  
Location: India | kiwijam - 2025-04-26 2:58 AM
A question for LMI:
Simple explanation here I think, unless I misunderstood the question. Two posts were pending approval as they were first time posts from people, and some of us were away for the weekend and slow to approve it. |
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Posts: 1869
Location: India | Optimizer SubmissionsSubmissions to Optimizer puzzles here. Puzzles are not checked for correctness. If you notice any incorrect submissions, please help Riad by reporting them.
Puzzle 10 : S not cross checked
Puzzle 11 : N not cross checked, Hitori not solved
Puzzle 12 : S, L not cross checked. puzzle not solved.
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Moscow Puzzle Cup 2016 Author
Posts: 249
Location: Russia | Preliminary+results+have+been+published%2E+%0D%0AI+ask+Christian+to+check+his+Hitori%2E+%0D%0ANikola&#
#43;check+his+Hitori%2E+%0D%0ANikola+and+Du%D1%81%2C+please+check+your+answers+to+puzzle+12%2E+The
ur+answers+to+puzzle+12%2E+The+lines+should+not+overlap%2E+
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Posts: 190
Location: New Zealand | Oh+wow%2C+thank+you+for+a+great+contest+Riad%21+The+puzzles+were+hard%2C+but+they+are+
#43;were+hard%2C+but+they+are+always+hard%2E+And+thank+you+to+all+the+contestants+with+sho
o+all+the+contestants+with+short+names%2E+%F0%9F%98%8E%0D%0AI+don%27t+think+anybody+has+got+100
t+think+anybody+has+got+100+points+before%2E+If+it+is+useful+for+others%2C+I+will+shar
eful+for+others%2C+I+will+share+some+thoughts+on+how+I+approached+them%2E%0D%0A%0D%0AOpti%2DSumdoku%3A
pproached+them%2E%0D%0A%0D%0AOpti%2DSumdoku%3A+%0D%0AThe+first+step+was+to+find+a+grid+with+a+high+
43;find+a+grid+with+a+high+Samedoku+score%2E+I+looked+at+patterns+for+each+digit+separatel
;patterns+for+each+digit+separately%2E+It+is+not+possible+to+place+a+digit+in+9+cells+
;place+a+digit+in+9+cells+so+that+it+counts+18+times+to+the+sum+%28when+every+digi
;to+the+sum+%28when+every+digit+can+see+another+digit+in+both+diagonal+directions%29%2E+The
;both+diagonal+directions%29%2E+The+best+possible+is+16+times+%28see+the+9s+in+my+solution%29%
8see+the+9s+in+my+solution%29%2E+But+not+all+digits+can+be+16+%2D+the+best+grid+ov
be+16+%2D+the+best+grid+overall+has+%7B16%2C+15%2C+15%2C+14%2C+14%2C+14%2C+14%2C+14%2C+
;14%2C+14%2C+14%2C+14%2C+14%2C+14%7D+for+the+Samedoku%2E+I+think+Carlos+has+the+same+grid&
hink+Carlos+has+the+same+grid+as+me%2E%0D%0AThe+second+step+is+to+take+away+as+many+di
is+to+take+away+as+many+digits+as+possible%2E+Check+for+uniqueness%2C+try+another+digit%2E+
uniqueness%2C+try+another+digit%2E+Eventually+you+will+get+down+to+%7E22+clues%2E%0D%0AThe+last+st
to+%7E22+clues%2E%0D%0AThe+last+step+is+to+choose+which+digit+goes+in+each+part+of+the+
3;goes+in+each+part+of+the+grid+pattern%2E+Calculate+16%2F15%2F14+minus+the+number+of+hints
4+minus+the+number+of+hints+remaining+%28e%2Eg%2E+9+gets+the+best+place+%3D+16%2D1%2C+8
+best+place+%3D+16%2D1%2C+8+gets+the+14%2D0%2C+7+gets+15%2D2%29%2E+%0D%0APlease+don%27t+try
%2D2%29%2E+%0D%0APlease+don%27t+try+to+solve+my+classic+sudoku%21+It+is+unique%2C+but+it+needs
3;It+is+unique%2C+but+it+needs+a+lot+of+Xwings%2C+Ywings%2C+chains%2E%2E%2E+%F0%9F%98%AD%0D%0A%0D%0ANa
#43;chains%2E%2E%2E+%F0%9F%98%AD%0D%0A%0D%0AName+Hitori%3A%0D%0AI+decided+to+use+all+the+2%2Dletter+and+3+
+all+the+2%2Dletter+and+3+words%2C+and+many+4s%2C+and+I+ignored+all+5%5FPLUS%5F+words%2E%0
#43;ignored+all+5%5FPLUS%5F+words%2E%0D%0AIt+is+easy+to+have+too+many+blacks%2C+or+not+enough+
;many+blacks%2C+or+not+enough+blacks%2C+so+I+started+by+trying+to+intersect+many+4%2Dwords+
ng+to+intersect+many+4%2Dwords+together%2E%0D%0AI+found+a+4x4+with+6+4%2Dwords+inside%2C+I+put
th+6+4%2Dwords+inside%2C+I+put+that+in+the+bottom%2Dleft+corner%2E+I+found+another+4x4+wit
ner%2E+I+found+another+4x4+with+6+words+inside%2E+When+I+put+that+in+the+bottom%2Dright%2C
;put+that+in+the+bottom%2Dright%2C+the+common+letters+%28e%2Eg%2E+ADEM%2DENDO%29+helped+fill+90%25+
3;ADEM%2DENDO%29+helped+fill+90%25+of+those+cells+with+black+or+white%2E+I+filled+the+top%2Dri
#43;white%2E+I+filled+the+top%2Dright+with+4%2Dwords+too%2C+sometimes+choosing+letters+for+Hitori%2C&#
s+choosing+letters+for+Hitori%2C+sometimes+choosing+for+intersection%2E+At+the+end+I+put+the&#
%2E+At+the+end+I+put+the+final+2%2D+and+3%2Dwords+in+the+gaps%2E+I+had+two+empty&#
;the+gaps%2E+I+had+two+empty+cells%2E+One+I+used+to+finish+the+Hitori%2C+and+one+was&#
sh+the+Hitori%2C+and+one+was+a+bonus+point%2E%0D%0A%0D%0AThreads+With+Knots%3A%0D%0AI+wanted+to+st
;With+Knots%3A%0D%0AI+wanted+to+start+with+long+diagonal+lines+for+the+1st%2C+3rd%2C+5th%2C+7t
or+the+1st%2C+3rd%2C+5th%2C+7th+sections+to+get+a+high+length%2E+I+put+small+numbers+n
ength%2E+I+put+small+numbers+near+the+corners%2E+The+8%2C5%2C3%2C7+clues+define+knots+1+to+
C7+clues+define+knots+1+to+7%2E+The+2+clue+is+not+needed%2C+but+it+did+give+lots&#
eded%2C+but+it+did+give+lots+of+empty+squares+on+the+long+diagonal%2E+%0D%0AThen+I+switche
g+diagonal%2E+%0D%0AThen+I+switched+to+finding+a+unique+solution+with+small+clues%2E+Thread+le
+with+small+clues%2E+Thread+length+was+less+important+now%2E+Putting+clues+on+the+same+par
;Putting+clues+on+the+same+parity%2Fcolour+diagonals+helped+too%2E+I+found+two+medium+numbers+
43;I+found+two+medium+numbers+%289%2C+13%29+to+finish%2E%0D%0ASP1+and+EKBM+both+had+much+bette
3;and+EKBM+both+had+much+better+clues+than+me%2C+but+my+long+thread+was+important%2E+It
long+thread+was+important%2E+It+is+possible+to+have+length+%3E+100%2C+but+then+you+need
3E+100%2C+but+then+you+need+too+many+big+clues+to+make+it+unique%2E
43;it+unique%2E
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Posts: 12
Location: Japan | Riad, thanks for organizing a great contest!
And congratulations to kiwijam for a perfect win!!!
Thanks also to the LMI team for running the event.
I had not participated in this contest for a few years, but I really enjoyed it.
I especially like prob. 7 and 12.
I didn't have time to fix my solution for 12 because it was the last day of the contest when I realized that the length of lines was important.I regret that.
Anyway, I think prob.12 is a really good optimization setup!
I like optimization puzzles very much, and I am very happy to see the April Contest where I can enjoy them.
I'm planning to hold an optimization contest at a local site in Japan.
I hope that the fun of optimization will spread more and more.
Edited by SP1 2025-04-29 10:13 PM
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Moscow Puzzle Cup 2016 Author
Posts: 249
Location: Russia | Thanks a lot to everyone!
Congratulations to James, Takuma and Paul!
Success in optimization problems in 2025 earned more points than ever. James had a very impressive victory. Only two participants managed to score points in all optimizations. Takuma, great result! Interestingly written in the two posts above. I wish Takuma success in organizing the optimization contest in Japan.
There were questions like: Why ban word overlapping in Hitori? I think through the answer format so that it is convenient for the organizers. A lot of parentheses can prevent Deb from forming grids with solutions. For clarity, it is better to place the parentheses sequentially. Thanks to the LMI team, Deb and Prasanna, and a special thanks to Kota for the long-term support! |
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Posts: 19
Location: United Kingdom | Thanks Riad and well done James! Are there solutions available to the puzzles? I had a tough time with some of them and was hoping to work through them with the solutions. |
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WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent
Riad Khanmagomedov's April Contest — 18th to 27th April 2025
