... by: Envy E

After Solver runs out of known solutions B9 = 1 4 7

+1 B9 +9 B8 +6 C8 +48 C1 B2 +3 B1
+4 B9 +8 B2 +3 B1
+7 B9 +4 6 F2 F9 +3 F3

3 eliminated from A3 B3 D1

... by: Frans Goosens

#646

Combination 2-digits cells

A4=1 Wrong, Undo calculation
A4=3 ( B8=9 ) Solved,

Total solving time is : 36 sec.
Number of logical steps is : 4519

... by: Serban

# 646 Basics to 25
1. Column 8 n=5 e=4 Nc=5 Ns=2 => D8=1 solve
Note: H8=2

2. Row F n=3 e=6 Nc=17 Ns=1 => F3=4 solve

3. Row C n=4 e=5 Nc=11 Ns=3 => C5=9 & [C1=8 OR C4=5 OR C9=4] solve
Note: C9=4

4. Row G n=4 e=5 Nc=9 Ns=4 => G5=6 basics to 46
4a. XY-Chain 1679 [B38,D8,F9] => B9<>7 => A7=7 solve


1a. XY-Chain 1679 [B38,D8,F9] => B9<>7 => A7=7 solve
Note: Nx=4
Basics to 25

... by: Dieter

#646 - populated cells = 25 = 30,9%
basics: E6=3, A5=4, B8=7

strategy: try to get hidden pairs or triplets. No solver used.
combinations of C5 = (4,5,8,9) and G5 = (1,3,6,7) as numbers 8,9,3,5,7 are populated most.
C5/G5 = (9/6) solves

... by: Serban

# 646 Basics to 25

1. Number 8 n=4 e=5 N=14 Nc=7 Ns=4 => J5=8 solve

2. Number 9 n=4 e=5 N=16 Nc=11 Ns=7 => B8=9 solve
Note: E9=H7=9

... by: Hrudaya

C1=8, G1=7 solved

... by: Hrudaya

C1=8, G1=7
SOLVED