SudokuSolver Forum

There are five puzzles and four difficulties to choose from.
All five puzzles have the same solution.

A) Novice.
B) Apprentice (mainstream edition).
C) Master-1 (1 Skyscraper).
D) Master-2 (1 XY-Chain).
E) Guru.



Regular Clueless Special #4A (Novice)

Rating based on required solving techniques:  Moderate

000080000050000078700060904290000005100000000000000007009008006400007051067030400
710000409000000000200580006008000093000000800100000000000903000650010034000000000
000000060030800001200460700001000024300000080002000000000000915610072000040000000
800603004010090603000000879040000050307000000000000700650000090090004030000030000
700600008090004026006097100067000000050000600100000900304060009870901400000000000
000004600230700000060000095750000000100000000000000249000500831020609500548000000
000900630006103580071005000102000000900000024000000096003450960020000400600080300
000070000058069700907800500100000089095000030006000070604700001001030206020000000
009000080040309150070408000700000060003000800080000005600590070030000006001000000



Regular Clueless Special #4B (Apprentice)

Rating based on required solving techniques:  Moderate

000080000050000078700060904290000000100000000000000007009008006400000051067030400
710000409000000000200580006008000093000000800100000000000903000650010034000000000
000000060030800001200400700000000024300000080002000000000000015610072000040000000
800003004010090603000000879040000050307000000000000700650000090090004000000030000
700600008090004026006097100067000000050000000100000900000060009870901400000000000
000004600230700000060000095750000000100000000000000249000500801020609500548000000
000900030006103580071000000102000000900000024000000006000450960000000000600080300
000070000008069700907800500100000009005000030006000070004700001001030206020000000
000000080040309100070408000000000060003000800080000005600590070030000006001000000



Regular Clueless Special #4C (Master-1)

Rating based on required solving techniques:  Barely Extra Hard

000080000050000078700060904290000000100000000000000007009008006400000051067030400
710000409000000000200580006008000093000000800100000000000903000650010034000000000
000000060030800001200400700000000024300000080002000000000000015610072000040000000
800003004010090603000000879040000050307000000000000700650000090090004000000030000
700600008090004026006097100007000000050000000100000900000060009870901400000000000
000004600230700000060000095050000000100000000000000249000500801020609500548000000
000900030006103580071000000102000000900000024000000006000450960000000000600080300
000070000008069700907800500100000089005000030006000070004700001001030206020000000
000000080040309100070408000000000060003000800080000005600590070030000006001000000



Regular Clueless Special #4D (Master-2)

Rating based on required solving techniques:  Barely Ultra Hard

000000000050000078700060904290000000100000000000000007009008006400000051067030400
710000409000000000200580006008000093000000800100000000000903000650010034000000000
000000060030800001200400700000000024300000080002000000000000015610072000040000000
800003004010090603000000879040000050307000000000000700650000090090004000000030000
700600008090004026006097100067000000050000000100000900000060009870901400000000000
000004600230700000060000095050000000100000000000000249000000801020609500548000000
000900030006103580071000000102000000900000024000000006000450960000000000600080300
000070000008069700907800500100000089005000030006000070004700001001030206020000000
000000080040309100070408000000000060003000800080000005600590070030000006001000000



Regular Clueless Special #4E (Guru)

Rating based on required solving techniques:  Ultra Hard

000080000050000078700060904290000000100000000000000007009008006400000051067030400
710000409000000000200580006008000093000000800100000000000903000650010034000000000
000000060030800001200400700000000024300000080002000000000000015610072000040000000
800003004010090603000000879040000050307000000000000700650000090090004000000030000
700000008090004026006097100067000000050000000100000900004060009870901400000000000
000004000230700000060000095750000000100000000000000249000500801020609500548000000
000900030006103580071000000102000000900000024000000006000450960000000000600080300
000070000008069700907800500100000009095000030006000070004700001001030206020000000
000000080040309100070408000000000060003000800080000005600590070030000006001000000

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Quis custodiet ipsos custodes?

Normal: [D  Y-m-d,  G:i]     PM->email: [D, d M Y H:i:s]

Just finished the 4C. Had to re-start once, but the second time I did find the "promissed" skyscraper.
Nice puzzle Børge thanks

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Nothing can both be and not be

There is also a remote pair in 4C

_________________
Jean-Christophe
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.

Is Remote Pairs a new separate solver in 1.3b2?
Unfortunately I have not found the time to try out 1.3b2 yet. With my solver sequence, the required techniques list for 4C produced by 1.3b1 is:

388 Naked Singles
148 Hidden Singles
 64 Intersections
  3 Naked Pairs
  3 Naked Triplets
  1 Naked Quads
  2 Hidden Pairs
  1 Skyscraper

_________________
Quis custodiet ipsos custodes?

Normal: [D  Y-m-d,  G:i]     PM->email: [D, d M Y H:i:s]

No, I spotted it myself...

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Jean-Christophe
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.

Am wondering if we found the same Remote Pair. Looked like a Skyscraper with "34" in all four cells?

It was this remote pair:


Note: 4D can be solved with one UR Type 1.

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Jean-Christophe
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.

What does it mean UR Type 1?
Could not find it referenced in Sudopedia
Closest thing is Unique Rectangle, but there is nothing about "Type 1"

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Nothing can both be and not be

It's called Uniqueness Test 1 in Sudopedia. But most people call this Unique Rectangle (UR) Type 1.

It's located in:

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Jean-Christophe
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.

A question/suggestion:
If there is a standard notation for referring to cells in multi grid Sudokus, I would very much like to learn it and I suggest that we then adopt it here.
JC, I have nothing against your notation, but personally I prefer putting the grid (being the largest object) first, like this:

_________________
Quis custodiet ipsos custodes?

Normal: [D  Y-m-d,  G:i]     PM->email: [D, d M Y H:i:s]