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immpy
Joined: 06 May 2017
Posts: 571
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 Posted: Tue May 23, 2017 10:05 am Post subject: VH+ 052317 |
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Enjoy the journey...
| Code: |
+-------+-------+-------+
| . 3 . | . . . | . 7 . |
| . . . | 4 6 7 | . . . |
| . . 2 | . . . | 5 . . |
+-------+-------+-------+
| . . . | . 2 8 | . . 7 |
| . . 6 | . . . | 8 . . |
| 8 . . | . 4 6 | . . 9 |
+-------+-------+-------+
| . . 3 | . . . | 7 . . |
| 6 . . | . 8 9 | . . 4 |
| . 5 . | . . . | . 1 . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Tue May 23, 2017 12:22 pm Post subject: |
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Basics :
5 singles : L3C2=6, L3C1=7, L3C8=L4C7=4, L4C8=6
{2B2, 3B2, 5B2, 5R8C9B5, 8C28, (48)C3, 7B7, 9R3, 9R19, (89)C8, (89)R7, (23)R2, (69)C7}
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V
-{2r1c79, 3r3c9, 5r1c13, 5r157c4, 5r5c18, 5r7c8, 8r2c39, 8r7c9, (19)r1c3, (79)r9c3, 7r8c4, 9r1c45, 9r2457c1, 9r2c7, (23)r2c8, 2r7c8, (124)r7c2, 1r2c79, 1r1c7, (23)r9c7}
2 singles : L6C7=1, L5C2=4
{1R2, 7B4, 9B4, (27)C2, (79)R5} -> -{1r1c1, 7r6c4, 9r4c4, 1r8c2, (13)r5c4, (135)r5c5}
{(15)r17c5} -> -{1r3c5}
| Code: | +---------------+----------------+---------------+
| 49 3 48 | 128 15 125 | 69 7 168 |
| 15 189 159 | 4 6 7 | 23 89 23 |
| 7 6 2 | 1389 39 13 | 5 4 18 |
+---------------+----------------+---------------+
| 135 19 159 | 135 2 8 | 4 6 7 |
| 123 4 6 | 79 79 135 | 8 23 235 |
| 8 27 57 | 35 4 6 | 1 235 9 |
+---------------+----------------+---------------+
| 124 89 3 | 126 15 1245 | 7 89 256 |
| 6 27 17 | 1235 8 9 | 23 235 4 |
| 249 5 48 | 2367 37 234 | 69 1 2368 |
+---------------+----------------+---------------+
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Analysis of the puzzle from (49)L1C1
1. 4r1c1 -> 23 singles; {1R157} -> -{1r24c1}; 3 singles; BUG+2 :
| Code: | +-------------+------------+--------------+
| 4 3 8 | 2 15 15 | 9 7 6 |
| 5 19 19 | 4 6 7 | 23 8 23 |
| 7 6 2 | 8 9 3 | 5 4 1 |
+-------------+------------+--------------+
| 3 19 159 | 15 2 8 | 4 6 7 |
| 12 4 6 | 9 7 15 | 8 23 235 |
| 8 27 57 | 3 4 6 | 1 25 9 |
+-------------+------------+--------------+
| 12 8 3 | 6 15 4 | 7 9 25 |
| 6 27 17 | 15 8 9 | 23 235 4 |
| 9 5 4 | 7 3 2 | 6 1 8 |
+-------------+------------+--------------+
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a. 4r1c1 + 1r4c3 -> 1 solution
b. 4r1c1 + 5r4c3 -> 2 solutions [DP(23)r2c79.r5c89.r8c78]
c. 4r1c1 + 9r4c3 -> 1 solution
2. 9r1c1 -> BUG+1 : 3 solutions
| Code: | +------------+-------------+-----------+
| 9 3 4 | 128 15 25 | 6 7 18 |
| 15 8 15 | 4 6 7 | 2 9 3 |
| 7 6 2 | 18 9 3 | 5 4 18 |
+------------+-------------+-----------+
| 35 1 9 | 35 2 8 | 4 6 7 |
| 23 4 6 | 9 7 1 | 8 23 5 |
| 8 27 57 | 35 4 6 | 1 23 9 |
+------------+-------------+-----------+
| 14 9 3 | 6 15 45 | 7 8 2 |
| 6 27 17 | 12 8 9 | 3 5 4 |
| 24 5 8 | 7 3 24 | 9 1 6 |
+------------+-------------+-----------+
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Conclusion : the puzzle has 7 solutions |
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