Stuck on Nov. 18 Washington Post

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Stuck on Nov. 18 Washington Post

Postby Sandy Kimble » Fri Nov 18, 2005 7:05 pm

I smugly thought I was really good at these, but am stumped with today's hard puzzle in the Washington Post. Can anyone suggest anything?

So far I have:




I checked the answers and these are correct, but I can't find another move.
Sandy Kimble
Posts: 3
Joined: 18 November 2005

Postby simes » Fri Nov 18, 2005 7:10 pm

There's a hidden pair 7 and 9 in row 3. After that you can place a 1 in r3c9.

Posts: 324
Joined: 11 March 2005
Location: UK

Postby masb » Sat Nov 26, 2005 2:27 am

simes wrote:There's a 7 and 9 in row 3. After that you can place a 1 in r3c9.


That is true but probably not the only next step. My solver program, Numbler (see comes up with:

Code: Select all
Box Row @ 3> r3c4x4 r3c5x4
Box Column @ 5> r7c5x5
Row Box @ 2> r1c9x8 r3c7x8 r3c8x8 r3c9x8
Quad Box r1c2=1 r3c1x3 r3c1x6 r3c2x8
Single Row r3c9=1
Box Column @ 1> r7c3x8 r8c3=5

After that it is just singles. The first step is box 3 only having 4s on row 3 so that 4 can be eliminated from r3c4 and r3c5. The next step is similar on box 5. The "x" means remove a pencil candidate and "=" means set a cell to that value. The reference cells or boxes are given between "@" and ">".
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Joined: 17 November 2005

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