9x9 Tim Stellmach 2017.txt

Order 3: digits 9; houses 27, cells 81.

Grid.grid1: initial copying

pending={a1, a2, a5, b1, b4, b5, b6, c2, c3, c8, d1, d5, d9, e1, e4, e6, e9, f1, f5, f9, g2, g7, g8, h4, h5, h6, h9, i5, i8, i9}

deduce.grid1: naked-singles

deduce.grid1. Solved.

grid1
1 2 3 4 5 6 7 8 9
a 5 3 4 6 7 8 9 1 2
b 6 7 2 1 9 5 3 4 8
c 1 9 8 3 4 2 5 6 7
d 8 5 9 7 6 1 4 2 3
e 4 2 6 8 5 3 7 9 1
f 7 1 3 9 2 4 8 5 6
g 9 6 1 5 3 7 2 8 4
h 2 8 7 4 1 9 6 3 5
i 3 4 5 2 8 6 1 7 9

grid1. Copying solution to raw grid.