... by: Serban

# 620 A9=4 B2=6 Basics to 26

1. if F8=5 => F4=7 F6=8 basics to 39
2. X-chain x=6 => [ J4,CE5,A7,D8 ]<>6 ;
X-chain x=9 => GH4<>9 => A7=9 OR G4=4 solve

... by: Frans Goosens

With trial and error

Combination A3=237 and G9=269

************************************************************
A3=2 G9=2 Wrong, Undo calculation

All reset to initial position

************************************************************
A3=2 G9=6 ( A7=9 ) Solved,

Total solving time is : 25 sec.
Number of logical steps is : 2981

... by: SM

I don't like Magic Singles/Pairs (like r2c1=9 & r5c7=6). Here's an alternative.

r89c29 can't be solved by 29 (deadly configuration), but that's exactly what would happen if r8c2=2:
bilocation of 2 in r8c89 and r7c9 forces r7c9=2.
bilocation of 9 in r7c2 and r8c2 forces r7c2=9.
so far so easy; for the final stretch (forcing 1 or 2 into r8c9):
8c2=2 → r5c2=1 → r5c7≠1 → r2c7=1 → r2c7≠5 → r89c7=5 → r8c9≠5

Context: [URL of the solver on this site that isn't allowed to be referred to]?bd=S9B01052gaaag1k8i080dbc0f488b8g1d8386079i042e08au1z02928z624309027e5m033m1v050l2l033e093738086048062q014i049w844gbc058qc807c2018k06bd4h8bc04xde9w844407458zck5hci0403

... by: Serban

# 620 A9=4 B2=6 Basics to 26

1. if B4=5 => F4=7 basics to 28
2. X-chain x=6 => G4<>6 ; X-chain x=9 => G4<>9 ; => G4=H3=D1=E5=B6=4 solve

... by: Dieter

#620 - basics: A9=4; B2=6
strategy: try to get hidden pairs or triplets
E3 = (1,2,4,7)
basic checks: E3=1, E3=2 failed
E3=7 & F2=2 solve

... by: Serban

# 620 A9=4 B2=6 Basics to 26

1. Number 5 n=3 e=6 N=27 Nc=52 Ns=2 => B4=H6=5 solve

2. Number 6 n =3 e=6 N=23 Nc=20 Ns=6 => E7=J5=6 solve

3. Box 5 DEF456 n=4 e=5 Nc=12 Ns=4 => D5=5 & [E5=4 OR D6=6] solve
Note : F6=8