Easy Puzzle #15 - 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	4			8	1			6	3		Easy Puzzle #15 - October 15, 2005
2		2		9	7			4			Original puzzle as published on joe-ks.com…
3		8	9			5	7	2
4		1	3	2	6			8	9
5					3		2
6		9		4	5				7
7							6
8	8			7	2		5	9
9		6	7	5	8		3	1
	A	B	C	D	E	F	G	H	I
1	4			8	1	2		6	3		Step 1: #2 is in Rows 2 & 3: #2 MUST go in Cell F1…
2		2		9	7			4
3		8	9			5	7	2
4		1	3	2	6			8	9		Step 2: #9 is in Rows 4 & 6: #9 MUST go in Cell F5…
5					3	9	2				(cf #9 in Column D @ D2 excludes use of Cell D5)
6		9		4	5				7
7							6				Step 3: #6 is in Rows 7 & 9: #6 MUST go in Cell F8…
8	8			7	2	6	5	9
9		6	7	5	8		3	1
	A	B	C	D	E	F	G	H	I
1	4			8	1	2	9	6	3		Step 4: Row #9 needs #9: #9 MUST go in Cell A9…
2		2		9	7			4			(#9 in Column F @ F5 excludes use of Cell F9, &
3		8	9			5	7	2			#9 in Column # @ I4 excludes use of Cell I9)
4		1	3	2	6			8	9
5					3	9	2				Step 5: #9 is in Rows 2 & 3: #9 MUST go in Cell G1…
6		9		4	5				7
7							6
8	8			7	2	6	5	9
9	9	6	7	5	8		3	1
	A	B	C	D	E	F	G	H	I
1	4			8	1	2	9	6	3		Step 6: Complete Row 9: need #s 2 & 4…
2		2		9	7			4			#2 can't go in Cell F9 (cf #2 in Column F @ F1), so
3		8	9			5	7	2			#2 MUST go in Cell I9, & therefore #4 MUST go in Cell F9
4		1	3	2	6			8	9
5					3	9	2
6		9		4	5				7		Step 7: #7 is in Columns G & I: #7 MUST go in Cell H7…
7							6	7
8	8			7	2	6	5	9
9	9	6	7	5	8	4	3	1	2
	A	B	C	D	E	F	G	H	I
1	4	7	5	8	1	2	9	6	3		Step 8: Complete Row 1: need #s 5 & 7…
2		2		9	7			4			#7 can't go in Cell C1 (cf #7 in Column C @ C9), so
3		8	9			5	7	2			#7 MUST go in Cell B1, & therefore #5 MUST go in Cell C1
4		1	3	2	6			8	9
5					3	9	2
6		9		4	5				7
7							6	7
8	8			7	2	6	5	9
9	9	6	7	5	8	4	3	1	2
	A	B	C	D	E	F	G	H	I
1	4	7	5	8	1	2	9	6	3		Step 9: #6 is in Columns E & F: #6 MUST go in Cell D3…
2		2		9	7			4
3		8	9	6		5	7	2
4		1	3	2	6			8	9		Step 10: #6 is in Columns G & H: #6 MUST go in Cell I5…
5					3	9	2		6
6		9		4	5				7
7							6	7
8	8			7	2	6	5	9
9	9	6	7	5	8	4	3	1	2
	A	B	C	D	E	F	G	H	I
1	4	7	5	8	1	2	9	6	3		Step 11: #4 is in Rows 1 & 2: #4 MUST go in Cell E3…
2		2		9	7			4
3		8	9	6	4	5	7	2
4		1	3	2	6			8	9		Step 12: #3 is in Rows 4 & 5: #3 MUST go in Cell H6…
5					3	9	2		6		(#3 in Column G @ G9 excludes use of Cell G6)
6		9		4	5			3	7
7							6	7
8	8			7	2	6	5	9
9	9	6	7	5	8	4	3	1	2
	A	B	C	D	E	F	G	H	I
1	4	7	5	8	1	2	9	6	3		Step 13: Complete Block BB: #3 MUST go in Cell F2…
2		2		9	7	3		4
3		8	9	6	4	5	7	2
4		1	3	2	6			8	9		Step 14: Complete Block II: need #s 4 & 8…
5					3	9	2		6		#8 can't go in Cell I8 (cf #8 in Row 8 @ A8), so
6		9		4	5			3	7		#8 MUST go in Cell I7, & therefore #4 MUST go in Cell I8
7							6	7	8
8	8			7	2	6	5	9	4
9	9	6	7	5	8	4	3	1	2
	A	B	C	D	E	F	G	H	I
1	4	7	5	8	1	2	9	6	3		Step 15: Complete Row 3: need #s 1 & 3…
2		2		9	7	3		4			#3 can't go in Cell I3 (cf #3 in Column I @ I1), so
3	3	8	9	6	4	5	7	2	1		#3 MUST go in Cell A3, & therefore #1 MUST go in Cell I3
4		1	3	2	6			8	9
5					3	9	2		6		Step 16: Block FF needs #1: #1 MUST go in Cell G6…
6		9		4	5		1	3	7		(cf #1 in Row 4 @ B4 excludes G4, & #1 in Column H
7							6	7	8		@ H9 excludes H5)
8	8			7	2	6	5	9	4
9	9	6	7	5	8	4	3	1	2
	A	B	C	D	E	F	G	H	I