# sudoku

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explanations:-
this is step:- 3

The 3, then 6 and 5 in the top row all had only one option. ie. if you look at c6r1 and check the known numbers from 1 to 9 already in row1, col6 and box2, the only one missing is 3.

The possible numbers were then updated in associated cells.

The new 3 in row 1 with the 3 in box 1 makes a 3 in box 3 which leaves a 7 in the last cell in the box.

The 7 in box 3 makes a 2 in c6r3.

.

c1
c2
c3

c4
c5
c6

c7
c8
c9

7 8
 4569
1
 3459
 3
3

 36
6
 356
5
2
r1
box

1
2
&
3
 259
 box 1
1
 259

 2579
 3579
6
 37
3
 box 3
8
4
r2
 256
3
 2456
8
 2457
 27
2
1
 567
7
9
r3
4
 25
7
 256
 235678
9
 28
1
 68
r4
box

4
5
&
6
 82
 box 4
9
3
 267
 12678
 1278
5
 box 6
4
 678
r5
 825
6 1   4
 23578
 1278
9
 23
 78
r6
3
 257
8
 2679
 12679
4
 27
 269
 1567
r7
box

7
8
&
9
 2569
 box 7
4
 2569
3
 126789
 1278

 278
 269
 15678
r8
1
 27
 269

 2679
 26789
5   4
 269
3
r9
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