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Jul 01 VH

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ZeroAssoluto

Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy

Posted: Fri Jul 01, 2022 9:11 am Post subject: Jul 01 VH

Hi everyone,

Code:

+--------------+-------------+-----------+
| 1 267 5 | 247 267 3 | 8 9 24 |
| 2349 23 349 | 24 5 8 | 7 1 6 |
| 246 8 47 | 1 267 9 | 24 3 5 |
+--------------+-------------+-----------+
| 8 27 6 | 9 3 5 | 24 247 1 |
| 49 5 49 | 8 27 1 | 6 27 3 |
| 23 1 37 | 267 4 26 | 5 8 9 |
+--------------+-------------+-----------+
| 5 4 2 | 3 1 7 | 9 6 8 |
| 7 9 1 | 256 8 246 | 3 245 24 |
| 36 36 8 | 25 9 24 | 1 245 7 |
+--------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing 2,3,7 in r24c2,r6c3 and -3 in r2c3
Skyscraper
with number 7 in r36c3,r16c4 and -7 in r1c2,r3c5
with number 7 in r3c35,r6c34 and -7 in r1c4,r5c5
with number 7 in r14c2,r16c4 and -7 in r6c3
2-String Kite
with number 7 in r14c2,r6c34 and -7 in r1c4
with number 7 in r3c35,r16c4 and -7 in r6c3
W-Wing
2,3 in r2c2,r6c1 SL with number 3 in r9c12 and -2 in r23c1,r4c2
2,3 in r2c2,r6c1 SL with number 3 in r26c3 and -2 in r23c1,r4c2
Colors with number 7
color1 = r1c24,r3c5,r4c8,r5c5,r6c3
color2 = r3c3,r4c2,r5c8,r6c4
and delete color1

Ciao Gianni

TomC

Joined: 30 Oct 2020
Posts: 358
Location: Wales

Posted: Fri Jul 01, 2022 12:34 pm Post subject:

r6c1=2 to solve

Code:

+------------------+-------------+-----------+
| 1 267 5 | 247 267 3 | 8 9 24 |
| 2349 d23 349 | 24 5 8 | 7 1 6 |
| 246 8 47 | 1 267 9 | 24 3 5 |
+------------------+-------------+-----------+
| 8 c27 6 | 9 3 5 | 24 247 1 |
| 49 5 49 | 8 27 1 | 6 27 3 |
| a23 1 b37 | 267 4 26 | 5 8 9 |
+------------------+-------------+-----------+
| 5 4 2 | 3 1 7 | 9 6 8 |
| 7 9 1 | 256 8 246 | 3 245 24 |
| -36 -36 8 | 25 9 24 | 1 245 7 |
+------------------+-------------+-----------+

If a=3, b=7, c=2, d=3 leads to no <3>'s in box 7 or column 3

Is the <23> pair in "a" + "d" a W-wing?

YES, if you use the strong links on <3> in box 7 or column 3, you get if a=3, d=2 or if d=3, a=2
NO, if you follow the XY chain you get if a=3, d=3

So "a" cannot be <3> to resolve this situation

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