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  Topic: Chicago Tribune 8/4/17
JC Van Hay

Replies: 6
Views: 7076

PostForum: Other puzzles   Posted: Tue Oct 31, 2017 9:15 pm   Subject: Chicago Tribune 8/4/17
5r1c1 -> 1 solution
8r1c1 -> 0 solution

An optimized interpretation :
+-----------------+-------------------+--------------------+
| 5-8 17 2 | (48) 6 5(4) | 1 ...
  Topic: VH++101317
JC Van Hay

Replies: 2
Views: 4597

PostForum: Other puzzles   Posted: Mon Oct 30, 2017 12:17 am   Subject: VH++101317
9 singles
Skyscraper{2C36} -> -{2r9c1, 2r8c45}; 2 singles
Claiming{6C3} -> -{6r23c1, 6r12c2}
Jellyfish{6R25C16} -> -{6r39c8, 6r9c7}
Pointing{7B9} -> -{7r1c9}; 2 singles
Claiming{8C4} ...
  Topic: Can you spot the next move?
JC Van Hay

Replies: 4
Views: 5398

PostForum: Other puzzles   Posted: Fri Oct 13, 2017 9:21 am   Subject: Can you spot the next move?
1. Sudoku rule : a candidate for a digit d missing from all the valid solutions of the digit d is excluded.
+----------------------+-----------------+--------------------+
| 19 3 59 | 7 ...
  Topic: Bonus VH for 101017
JC Van Hay

Replies: 3
Views: 4521

PostForum: Other puzzles   Posted: Tue Oct 10, 2017 12:48 pm   Subject: Bonus VH for 101017
B6 -> 1 unique solution :
+--------------------+---------------+------------------+
| 19 12 7 | 8 4 5 | 239 6 23 |
| 589 2568 268 | 26 7 3 | 29 1 4 ...
  Topic: very hard VIIi
JC Van Hay

Replies: 2
Views: 2619

PostForum: Other puzzles   Posted: Thu Aug 31, 2017 7:59 pm   Subject: very hard VIIi
3 singles; HP(18)r47c6; LC(5B8, 6B2)
+-----------------------+----------------+-----------------------+
| -6(34) 9(34) 169(4) | 7 8 9(3) | 169 2 5 ...
  Topic: very hard VII
JC Van Hay

Replies: 2
Views: 2710

PostForum: Other puzzles   Posted: Mon Aug 28, 2017 9:33 am   Subject: very hard VII
+-------------------+--------------------+------------------+
| 78(9) 2 5789 | 1589 3 1459 | 6 78 145 |
| 378 1 3578 | 58 2568 56(24) | 5(4) ...
  Topic: sett.sudoku 18082017
JC Van Hay

Replies: 1
Views: 2808

PostForum: Other puzzles   Posted: Sat Aug 26, 2017 8:27 am   Subject: sett.sudoku 18082017
2L2C4 + (58)L4C4 -> 0 solution; L2C1=2 and stte
  Topic: Aug 23 VH
JC Van Hay

Replies: 15
Views: 12995

PostForum: Daily Sudoku puzzles   Posted: Wed Aug 23, 2017 8:30 am   Subject: Aug 23 VH
r3c8=r8c5=8 Rolling Eyes
  Topic: Aug 23 VH
JC Van Hay

Replies: 15
Views: 12995

PostForum: Daily Sudoku puzzles   Posted: Wed Aug 23, 2017 5:51 am   Subject: Aug 23 VH
Only 1r7c2 [1r3c9] belongs [doesn't belong] to all the solutions of the 1s; stte

Interpretation :
Grouped Kite {1R2, 1C9} -> -1r9c1; r7c2=1 and stte
[Skyscraper {1C57} -> -1r3c9]
  Topic: very hard VI
JC Van Hay

Replies: 2
Views: 2924

PostForum: Other puzzles   Posted: Mon Aug 21, 2017 8:30 pm   Subject: very hard VI
8 singles; exclusions by the solutions of the 3s, the 5s and C2
+-------------------------+-------------------+-------------------+
| 2 56 89 | 7 159 159 | 1389 3468 1489 ...
  Topic: very extreme I
JC Van Hay

Replies: 2
Views: 2836

PostForum: Other puzzles   Posted: Thu Aug 17, 2017 5:22 pm   Subject: very extreme I
The following Symmetric Pigeonhole Matrix :
+---------------------+-----------------------+------------------------+
| 25678 2689 2789 | 3579 (589) 1 | 2357-6 4 (367& ...
  Topic: sett.sudoku 12082017
JC Van Hay

Replies: 3
Views: 3465

PostForum: Other puzzles   Posted: Mon Aug 14, 2017 12:15 pm   Subject: sett.sudoku 12082017
SSTS to the end :
Basics : 11 singles; X-Wing(3R15) -> -{3r9c5, 3r3c8}; Grouped Kite(8R1C9) -> -{8r9c5}; r9c5=6
XY-Wing(348)r58c5,r6c4 -> -{8r9c4}; stte
  Topic: VH+081017
JC Van Hay

Replies: 11
Views: 6653

PostForum: Other puzzles   Posted: Sat Aug 12, 2017 3:05 pm   Subject: VH+081017
Hi Paolo, to avoid any confusion, here is my definition of basics :

Basics : application of the Sudoku puzzle "basic" rule : a candidate is (placed/excluded) if it (belongs/doesn't belong ...
  Topic: VH+081017
JC Van Hay

Replies: 11
Views: 6653

PostForum: Other puzzles   Posted: Sat Aug 12, 2017 12:30 pm   Subject: VH+081017
Hi Paolo,

In my solution, I optimized the rational basics, otherwise they would lead to 7 singles !

JC
  Topic: VH+081017
JC Van Hay

Replies: 11
Views: 6653

PostForum: Other puzzles   Posted: Sat Aug 12, 2017 10:21 am   Subject: Re: VH+801017
(4=175)r7c469 - (5=6)r7c3 - (6=4)r1c123, r2c23 - (4)r2c5 = (4)r3c4 - (4)r7c4 (a loop) => - 4 r7c2, r89c4; stteHi Clement,

Interesting loop, however

1. your hyper-condensed Eureka notation doe ...
  Topic: VH+081017
JC Van Hay

Replies: 11
Views: 6653

PostForum: Other puzzles   Posted: Thu Aug 10, 2017 10:29 pm   Subject: VH+081017
3 singles; exclusions by the solutions of the 4s, C1; 1 single
+---------------------+-----------------------+-----------------------+
| 13 1378 38 | 5 6 1237 | 4 1237 ...
  Topic: very hard V
JC Van Hay

Replies: 3
Views: 3602

PostForum: Other puzzles   Posted: Thu Aug 10, 2017 4:01 pm   Subject: very hard V
8 singles
Exclusions by the solutions of the 2s, 4s
Exclusions by the solutions of B9, R8; 4 singles

6r2c7 -> 0 solution via the exclusions by the solutions of the 9s, C8 and the 1s; 5 singles ...
  Topic: sett.sudoku 04082017
JC Van Hay

Replies: 11
Views: 6510

PostForum: Other puzzles   Posted: Tue Aug 08, 2017 4:25 pm   Subject: sett.sudoku 04082017
Hi Paolo,

Using your constraints in step 2, one can write the following mixed block matrix :
|2r46c7 2r5c8|
|2r3c2 2r5c2| 2r8c2
&2r8c5 4r8c5 &
& ...
  Topic: sett.sudoku 04082017
JC Van Hay

Replies: 11
Views: 6510

PostForum: Other puzzles   Posted: Mon Aug 07, 2017 11:45 pm   Subject: sett.sudoku 04082017
Hi Paolo,

your step 2 : the solutions of your 5 constraints {(24)r28c5, 2C2B26} effectively exclude {2r3c7, 2r8c2}. To wit : 2r2c5 -> 2r3c2 , while 4r2c5 -> 2r8c2, EmptyRectangle(2C2, 2B6). T ...
  Topic: sett.sudoku 04082017
JC Van Hay

Replies: 11
Views: 6510

PostForum: Other puzzles   Posted: Mon Aug 07, 2017 7:08 pm   Subject: sett.sudoku 04082017
Hi Paolo,

your
step 6 is included in step 2;
step 8 is to be corrected, for example : {8C3, 6R2, (62)r4c1, 2C7} -> -8r6c7;
step 10 : r1c8=2.

JC
 
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