Easy Puzzle #12 - One Possible Solution Approach…
	NB:  There is only one final solution to this Sudoku puzzle…
	Rules: Place a number from 1-9 in each empty cell so that each row, each column AND each 3x3 block contains all the numbers from 1-9.
	A	B	C	D	E	F	G	H	I
1
2	AA			BB			CC				Reference to 3x3 Blocks AA, BB & CC
3
4
5	DD			EE			FF				Reference to 3x3 Blocks DD, EE & FF
6
7
8	GG			HH			II				Reference to 3x3 Blocks GG, HH & II
9
	A	B	C	D	E	F	G	H	I
1		2				7		5	6		Easy Puzzle #12 - October 12, 2005
2	7		8		2	4					Original puzzle as published on joe-ks.com…
3		3	4			9			7
4		8	1		3			4	9
5	4		2	5	7	1
6						8		2	5
7			3			5	9	6
8		7			4	2			3
9			5	9			8		4
	A	B	C	D	E	F	G	H	I
1		2				7	4	5	6		Step 1: #4 is in Rows 2 & 3: #4 MUST go in Cell G1…
2	7		8		2	4
3		3	4			9			7
4	5	8	1		3			4	9		Step 2: #5 is in Rows 5 & 6: #5 MUST go in Cell A4…
5	4		2	5	7	1
6						8		2	5
7		4	3			5	9	6			Step 3: #4 is in Rows 8 & 9: #4 MUST go in Cell B7
8		7			4	2			3		(cf #4 in Column 1 @ A5 excludes use of Cell A7)
9			5	9			8		4
	A	B	C	D	E	F	G	H	I
1		2				7	4	5	6		Step 4: #3 is in Columns B & C: #3 MUST go in Cell A6…
2	7		8		2	4
3		3	4			9			7
4	5	8	1		3			4	9		Step 5: #9 is in Columns D & F: #9 MUST go in Cell E6…
5	4		2	5	7	1
6	3				9	8		2	5
7		4	3			5	9	6			Step 6: #5 is in Columns H & I: #5 MUST go in Cell G8…
8		7			4	2	5		3
9			5	9			8		4
	A	B	C	D	E	F	G	H	I
1		2				7	4	5	6		Step 7: #7 is in Columns A & B: #7 MUST go in Cell C6…
2	7		8		2	4		9
3		3	4			9			7
4	5	8	1		3			4	9		Step 8: #7 is in Columns E & F: #7 MUST go in Cell D7
5	4		2	5	7	1					(cf #7 in Row 8 @ B8 excludes use of Cell D8)
6	3		7		9	8		2	5
7		4	3	7		5	9	6			Step 9: #9 is in Columns G & I: #9 MUST go in Cell H2
8		7			4	2	5		3		(cf #9 in Row 3 @ F3 excludes use of Cell H3)
9			5	9			8		4
	A	B	C	D	E	F	G	H	I
1		2	9			7	4	5	6		Step 10: Complete Column C: need #s 6 & 9…
2	7		8		2	4		9			#6 can't go in Cell C1 (cf #6 in Row 1 @ I1), so
3		3	4			9			7		#6 MUST go in Cell C8, & therefore #9 MUST go in Cell C1
4	5	8	1	2	3			4	9
5	4		2	5	7	1					Step 11: Block EE needs #2: #2 can't go in Cells F1 or D6
6	3		7		9	8		2	5		(cf #2 in Column F @ F8 & #2 in Row 6 @ H6), so
7		4	3	7		5	9	6			@2 MUST go in Cell D4…
8		7	6		4	2	5		3
9			5	9			8		4
	A	B	C	D	E	F	G	H	I
1		2	9			7	4	5	6		Step 12: Complete Block EE: need #s 4 & 6…
2	7	5	8		2	4		9			#4 can't go in Cell F4 (cf #4 in Row 4 @ H4), so
3		3	4			9			7		#4 MUST go in Cell D6, & therefore #6 MUST go in Cell F4
4	5	8	1	2	3	6		4	9		Step 13: Block AA needs #5: #5 can't go in Cells A1 or A3
5	4		2	5	7	1					(cf #5 in Column A @ A4 & #5 in Row 1 @ H1), so
6	3		7	4	9	8		2	5		#5 MUST go in Cell B2…
7		4	3	7		5	9	6	2		Step 14: Block II needs #2: #2 can't go in Cells H8 or H9
8		7	6		4	2	5		3		(cf #2 in Column H @ H6), so #2 MUST go in Cell I7…
9			5	9			8		4
	A	B	C	D	E	F	G	H	I
1	1	2	9			7	4	5	6		Step 15: Complete Block AA: need #s 1 & 6…
2	7	5	8		2	4		9			#6 can't go in Cell A1 (cf #6 in Row 1 @ I1), so
3	6	3	4			9			7		#6 MUST go in Cell A3, & therefore #1 MUST go in Cell A1
4	5	8	1	2	3	6		4	9
5	4	9	2	5	7	1					Step 16: Complete Block DD: need #s 6 & 9…
6	3	6	7	4	9	8		2	5		#9 can't go in Cell B6 (cf #9 in Row 6 @ E6), so
7		4	3	7		5	9	6	2		#9 MUST go in Cell B5, & therefore #6 MUST go in Cell B6
8		7	6		4	2	5		3
9			5	9			8	7	4		Step 17: #7 is in Rows 7 & 8: #7 MUST go in Cell H9…
	A	B	C	D	E	F	G	H	I
1	1	2	9			7	4	5	6		Step 18: Complete Column B: #1 MUST go in Cell B9…
2	7	5	8		2	4		9
3	6	3	4			9			7
4	5	8	1	2	3	6	7	4	9		Step 19: Complete Row 4: #7 MUST go in Cell G4…
5	4	9	2	5	7	1
6	3	6	7	4	9	8	1	2	5
7		4	3	7		5	9	6	2		Step 20: Complete Row 6: #1 MUST go in Cell G6…
8		7	6		4	2	5		3
9		1	5	9			8	7	4
	A	B	C	D	E	F	G	H	I
1	1	2	9			7	4	5	6		Step 21: #6 is in Rows 1 & 3: #6 MUST go in Cell D2…
2	7	5	8	6	2	4		9
3	6	3	4			9			7
4	5	8	1	2	3	6	7	4	9		Step 22: #9 is in Rows 7 & 9: #9 MUST go in Cell A8…
5	4	9	2	5	7	1
6	3	6	7	4	9	8	1	2	5
7		4	3	7		5	9	6	2		Step 23: Complete Block II: #1 MUST go in Cell H8…
8	9	7	6		4	2	5	1	3
9		1