Easy Puzzle #23 - 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	1	3		9	7			8	6		Easy Puzzle #23 - October 23, 2005
2	2	4		8		1			5		Original puzzle as published on joe-ks.com…
3					5	2	4
4	6	5				7		4
5	4		3				6		7
6		8		4				5	3
7			7		2
8	5			6		9		7	8
9	9	6			4	3		1	2
	A	B	C	D	E	F	G	H	I
1	1	3		9	7	4		8	6		Step 1: #4 is in Rows 2 & 3: #4 MUST go in Cell F1…
2	2	4		8		1			5
3					5	2	4
4	6	5				7		4			Step 2: #7 is in Rows 4 & 5: #7 MUST go in Cell A6
5	4		3				6		7		(cf #7 in Column C @ C7 excludes use of Cell C6)
6	7	8		4				5	3
7			7		2
8	5			6		9		7	8
9	9	6			4	3		1	2
	A	B	C	D	E	F	G	H	I
1	1	3		9	7	4		8	6		Step 3: #3 is in Columns B & C: #3 MUST go in Cell A7…
2	2	4		8		1			5
3					5	2	4
4	6	5				7		4			Step 4: #7 is in Columns E & F: #7 MUST go in Cell D9
5	4		3				6		7		(cf #7 in Row 7 @ C7 excludes use of Cell D7)
6	7	8		4				5	3
7	3		7		2				4		Step 5: #4 is in Column G & H: #4 MUST go in Cell I7…
8	5			6		9		7	8
9	9	6		7	4	3		1	2
	A	B	C	D	E	F	G	H	I
1	1	3		9	7	4		8	6		Step 6: Complete Column A: #8 MUST go in Cell A3…
2	2	4		8		1			5
3	8				5	2	4
4	6	5				7	8	4			Step 7: #8 is in Columns H & I: #8 MUST go in Cell G4
5	4		3				6		7		(cf #8 in Row 6 @ B6 excludes use of G6)
6	7	8		4				5	3
7	3		7		2				4
8	5			6		9		7	8
9	9	6		7	4	3		1	2
	A	B	C	D	E	F	G	H	I
1	1	3		9	7	4		8	6		Step 8: Complete Block BB: need #s 3 & 6…
2	2	4		8	6	1	7		5		#6 can't go in Cell D3 (cf #6 in Column D @ D8), so
3	8			3	5	2	4				#6 MUST go in Cell E2, & therefore #3 MUST go in Cell D3
4	6	5				7	8	4
5	4		3				6		7		Step 9: #7 is in Columns H & I: #7 MUST go in Cell G2
6	7	8		4				5	3		(cf #7 in Row 1 @ E1 excludes use of Cell G1)
7	3		7		2				4
8	5			6		9		7	8
9	9	6		7	4	3		1	2
	A	B	C	D	E	F	G	H	I
1	1	3		9	7	4		8	6		Step 10: Complete Row 2: need #s 3 & 9…
2	2	4	9	8	6	1	7	3	5		#3 can't go in Cell C2 (cf #3 in Column C @ C5), so
3	8			3	5	2	4				#3 MUST go in Cell H2, & therefore #9 MUST go in Cell C2
4	6	5				7	8	4
5	4		3				6		7		Step 11: Complete Row 9: need #s 5 & 8…
6	7	8		4				5	3		#8 can't go in Cell G9 (cf #8 in Column G @ G4), so
7	3		7		2				4		#8 MUST go in Cell C9, & therefore #5 MUST go in Cell G9
8	5			6		9		7	8
9	9	6	8	7	4	3	5	1	2
	A	B	C	D	E	F	G	H	I
1	1	3	5	9	7	4	2	8	6		Step 12: Complete Row 1: need #s 2 & 5…
2	2	4	9	8	6	1	7	3	5		#5 can't go in Cell G1 (cf #5 in Column G @ G9), so
3	8			3	5	2	4				#5 MUST go in Cell C1, & therefore #2 MUST go in Cell G1
4	6	5				7	8	4
5	4		3				6		7		Step 13: Block GG needs #4: #4 MUST go in Cell C8
6	7	8		4				5	3		(cf #4 in Column B @ B2 excludes use of Cells B7 & B8)
7	3		7		2				4
8	5		4	6		9		7	8
9	9	6	8	7	4	3	5	1	2
	A	B	C	D	E	F	G	H	I
1	1	3	5	9	7	4	2	8	6		Step 14: #7 is in Columns A & C: #7 MUST go in Cell B3…
2	2	4	9	8	6	1	7	3	5
3	8	7	6	3	5	2	4				Step 15: Now only 1 cell left in Block AA:
4	6	5				7	8	4			#6 MUST go in Cell C3…
5	4		3				6	2	7
6	7	8		4				5	3		Step 16: #2 is in Columns G & I: #2 MUST go in Cell H5…
7	3		7		2				4
8	5		4	6		9		7	8
9	9	6	8	7	4	3	5	1	2
	A	B	C	D	E	F	G	H	I
1	1	3	5	9	7	4	2	8	6		Step 17: Complete Block CC: need #s 1 & 9…
2	2	4	9	8	6	1	7	3	5		#1 can't go in Cell H3 (cf #1 in Column H @ H9), so
3	8	7	6	3	5	2	4	9	1		#1 MUST go in Cell I3, & therefore #9 MUST go in Cell H3
4	6	5				7	8	4
5	4		3				6	2	7		Step 18: Complete Block GG: need #s 1 & 2…
6	7	8		4				5	3		#2 can't go in Cell B7 (cf #2 in Row 7 @ E7), so
7	3	1	7		2				4		#2 MUST go in Cell B8, & therefore #1 MUST go in Cell B7
8	5	2	4	6		9		7	8
9	9	6	8	7	4	3	5	1	2
	A	B	C	D	E	F	G	H	I
1	1	3	5	9	7	4	2	8	6		Step 19: Complete Column B: #9 MUST go in Cell B5…
2	2	4	9	8	6	1	7	3	5
3	8	7	6	3	5	2	4	9	1		Step 20: Complete Column H: #6 MUST go in Cell H7…
4	6	5				7	8	4	9
5	4	9	3				6	2	7		Step 21: Complete Column I: #9 MUST go in Cell I4…
6	7	8		4				5	3
7	3	1	7		2