... by: Dieter
#685 - initially populated cells: 24 = 29,6 %No solver used, solver = brain.
basics: A6=7
populated cells: 25 = 30,9 %
Strategy: numbers 6,7,4,5,8 occur most frequently, combine two cells.
combinations of C1 = (4,5,6,9) and D4 = (1,2,4,6,9)
after basic checks 2 matrices left: C1/D4 = 4/4 and 4/6
C1/D4 = 4/4 solves with B8=8
Optimization:
C1=4 & B8=8 solve.