... by: osiguy

My sincerest apologies. i'm working on a solver. i copy pasted wrong. this should solve it. again my copy/paste apologies.

634915728 952487613 871362954 243176589 598234176 167859432 419728365 385691247 726543891

... by: osiguy

I created a solver, this is the answer i believe it is correct. Kind of wondering if people here are interested or if its ok to share my code for help and accuracy

I think i had a typo earlier

634915728952487613871362954243176589598234176167859432419728365385691247726543891

... by: osiguy

I created a solver, this is the answer i believe it is correct

63491572895248761387136295424362954243176589598234176167859432419728365385691247726543891

... by: Frans Goosens

#686

Combination 2-digits cells

C6=2 No solution, Undo calculation
C6=7 No solution, Undo calculation
E1=5 ( E2=9 ) Solved,

Total solving time is : 8 sec.
Number of logical steps is : 721

... by: Frans Goosens

#686

Combinatie 2-cijferige cellen

C6=2 Geen oplossing, Ongedaan gemaakt.
C6=7 Geen oplossing, Ongedaan gemaakt.
E1=5 ( E2=9 ) Opgelost,

Totale oplostijd is: 7 sec.
Aantal logische stappen is : 721

... by: Envy E

From previous comments

D2 not 7 9
G1 not 5 7
H4 not 5
E5 not 9

+8 H4 +6 H7 +3+5+9 G7 G8 G9 +1+2 J8 J9 +9 J2 +7 E2 +5 E1 +3 E3+3 C4 +3 A2 +4 A3 +4 G1 +8 H1 H2 -8 H4

H4 set to 6

... by: Envy E

Once 7 is eliminated from G1

-5+7 J4 +7 G3 +1+2 B3 C3 +5+9 H3 H5

5 eliminated from H4

-9+5 H5 +7 J4 +7 G3 +1+2 B3 C3 +9 H3 +5 F3 +7 E2 +9 E2

9 eliminated from E5

... by: Envy E

-4 G1 +4 G3

Set G3 to 4 and let Solver takes steps

This leads to a unique rectangle eliminating 5 and 7 from G1

... by: Envy E

Start from where Solver runs out of known solutions

-4 D2 +4 D1 +4 G3 +1+2+7 A3 B3 C3 +5+7+9 E1 E2 F3 +2-4 D2

... by: Serban

# 686 A1=6 C9=J5=4 C7=9 Basics 27

1. C2=G4=7 solve

2. C2=7 & E1=5 solve

3. C2=7 & H3=5 solve

... by: Dieter

#686 - initially populated cells: 23 = 28,4 %
No solver used, solver = brain.
basics: C9=J5=4; A1=6; C7=9
populated cells: 27 = 33,3 %
Strategy: numbers 4,6,8,1,9 occur most frequently, combine two cells.
combinations of D1 = (1,2,4,5,7) and D4 = (1,5,6,7)
after basic checks 1 matrix left: D1/D4 = 2/1
D1/D4 = 2/1 solves with J4=5

Optimization:
D1=2 & J4=5 solve.

... by: Yves

F4=8 or G6=8 or F6=9

... by: Serban

# 686 A1=6 C9=J5=4 C7=9 Basics 27

1. F4=8 OR G6=8 solve

2. F6=9 OR G3=9 solve