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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jun 19, 2010 3:20 pm Post subject: Puzzle 10/06/19: (B) BBDB Turbot |
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Peterj: I'm pretty sure this puzzle has at least one turbot step.
| Code: | +-----------------------+
| 5 4 . | . . . | . . 6 |
| 6 . 3 | . 7 . | 1 . . |
| . 2 1 | . 4 . | 8 . 3 |
|-------+-------+-------|
| . . . | 4 . . | 3 . . |
| . 7 2 | . 3 . | . . . |
| . . . | . . 7 | 6 . . |
|-------+-------+-------|
| . 6 4 | 2 . 5 | . 8 . |
| . . . | . . . | 5 3 . |
| 2 . 5 | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Code: | after basics
+--------------------------------------------------------------+
| 5 4 789 | 3 189 189 | 2 79 6 |
| 6 89 3 | 589 7 2 | 1 459 459 |
| 79 2 1 | 569 4 69 | 8 579 3 |
|--------------------+--------------------+--------------------|
| 189 5 6 | 4 2 189 | 3 19 7 |
| 1489 7 2 | 1689 3 1689 | 49 1459 4589 |
| 1489 3 89 | 189 5 7 | 6 2 489 |
|--------------------+--------------------+--------------------|
| 3 6 4 | 2 19 5 | 7 8 19 |
| 789 189 789 | 189 6 4 | 5 3 2 |
| 2 189 5 | 7 189 3 | 49 6 149 |
+--------------------------------------------------------------+
# 66 eliminations remain
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Jun 20, 2010 9:04 am Post subject: |
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Definitely had turbot moves in it for me!
Four steps (or three if one allows oneself a simple xy-chain)
| Quote: | kite(8) (8)r2c2=r2c4 - r1c5=r9c5; r9c2<>8
skyscraper(8) (8)r1c3=r1c6 -r4c6=r4c1; r6c3<>8
xy-wing(78-9) r1c3; r2c89<>9
kite(9) (9)r2c4=r2c2 - r3c1=r8c1; r8c4<>9 |
last two steps can be replaced by...
| Quote: | | xy-chain (9=7)r1c8 - (7=8)r1c3 - (8=7)r8c3 - (7=9)r8c1 - (9=1)r8c4 - (1=9)r7c5; r1c5<>9 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sun Jun 20, 2010 10:39 am Post subject: |
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V similar
| Quote: | ER removes 8 from r8c4
Skyscraper removes 8 from r6c3
<789> XY Wing vertex at r1c3; r2c89<>9
Colouring contradiction removes a stack of 9s (six in all) to solve the puzzle |
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