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## Discussion...

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## ... by: James Havard

Top box row 47 subs and 68 seconds to get 4 solution subs. Two together gives a singles solution A6=3 B8=1

## ... by: Frans Goosens

Combination 2-digits cells

C1=5 No solution, Undo calculation
C1=7 No solution, Undo calculation
E4=1 No solution, Undo calculation
E4=9 No solution, Undo calculation
F8=4 No solution, Undo calculation
F8=9 ( C7=2 ) Solved,

#525--------------------------Solution
002 810 700-------------652 813 749
400 200 000-------------439 276 815
080 009 060-------------781 459 263

000 600 020-------------973 685 124
005 040 300-------------825 941 376
100 007 008-------------164 327 598

090 000 050-------------298 134 657
006 000 400-------------516 798 432
300 000 001-------------347 562 981

Total solving time is : 24 sec.
Number of logical steps is : 3731

## ... by: Herwi

D6=5 & F4=3 plus singles

## ... by: Serban

# 525 X-chain x=1 => H6<>1 Basics to 23

1. Box 2 DEF123 n=2 e=7 Nc=72 Ns=5 => D1=9 D3=3 solve
2. Box 3 GHJ123 n=3 e=6 Nc=33 Ns=31 => G3=8 J3=7 solve
3. Box 5 DEF456 n=3 e=6 Nc=22 Ns=6 => D6=5 E6=1 solve
4. Box 8 DEF789 n=3 e=6 Nc=12 Ns=10 =>D9=4 E9=6 solve
5. Box 9 GHJ789 n=3 e=6 Nc=46 Ns=17 =>G9=7 J7=9 basics to 47
X-chain x=5 => [C4,H56]<>5 x=8 => G6<>8 =>H6=D5=8 solve

## ... by: Valery

File "#525".
Trial and error.
Total solving time is: 2 sec.
The number of cycles: 11.

1. set E4 = 9
2. set E8 = 7
The number of selected cells: 2.

002 810 700..........652 813 749
400 200 000..........439 276 815
080 009 060..........781 459 263

000 600 020..........973 685 124
005 040 300..........825 941 376
100 007 008..........164 327 598

090 000 050..........298 134 657
006 000 400..........516 798 432
300 000 001..........347 562 981

## Archive

Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
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I had also included David Filmer's puzzles before #200 in the list.