dailysudoku.com

[mokr2]

Help, I am stuck. This is what I have so far, but I don't know what to do next. Any suggestions?

X9X0 BXX4 167X 2EXX
X67X 9X20 AXXD 1XBX
3XXX 71EF 90XX 64XX
X1X2 DXXA 4XXB 9057

7C56 1X8X XXBF E24O
XXX9 0FXX X16X X7XX
0XXX E4X6 X7XC XXXX
8XBF 2X75 X904 3X61

XXXD 8E9X 7XX0 4FX6
XFXX AXX2 CXDX 73XB
X76X 3X5X FX41 0XXX
X0CX 47F1 XBXX D5E2

582C FB4E 0D17 A639
639A 5XX7 BCFE 8124
XDX7 62A3 X4XX CD0E
xx0E C918 XXXX FD75

I know that:
on row 11 the combination 2E is restricted to c1 and c10,
on row 15 the combination 1F is restricted to c1 and c3,
on row 16 the combination 4V is restricted to c1 and c2,
on row 16 the combination 236A is restricted to c9,10,11,12.

What am I missing??

Thanks a million,
Thom

[Steve R]

It's good to hear from you, Thom.

In row 5 of your grid I think only one cell will accommodate 9. Perhaps this will help.

Steve

[mokr2]

Hi Steve,

Thanks for your answer, but -- unfortunately -- I already had the 9 in r5c8, which leaves only three possible positions for 3AD on r5, and CD for r6c8, BC for r9c8 and BCD for r11c8.

Any other suggestions?

Thanks

[Steve R]

Yes, I wondered if that was the case.

To finish the puzzle I think you need to eliminate D using the x-wing based on rows 5 and 8 (cover provided by columns 6 and 9).

If x-wings are unfamiliar, you might find SadMan’s explanation helpful.

Steve

[mokr2]

Thanks, Steven, that did the trick: I finished the whole thing in 10 minutes after eliminating some of the Ds!