Easy Puzzle #7 - One Possible Solution Approach…
	NB:  There is only one final solution to this Sudoku puzzle…
	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		2	7			9		Easy Puzzle #7 - October 7, 2005
2				9					4		Original puzzle as published on joe-ks.com…
3	7	9			3			2
4					6	3	8	9
5				2	7		3	4	1
6		1	7	4	9	8
7			3	7			6	5
8	8	7		3	4			1	2
9		6	1		5	9	4	7
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 1: #4 is in Rows 1 & 2: where does it go in Row 3?
2				9					4		Only 2 possibilities: @ Cell D3 or F3… but #4 is in
3	7	9			3	4		2			Column D (@ D6), so #4 MUST go in Cell F3…
4					6	3	8	9
5				2	7		3	4	1		Step #2: #3 is in Rows 7 & 8: #3 MUST go in Cell I9…
6		1	7	4	9	8
7			3	7			6	5
8	8	7		3	4			1	2
9		6	1		5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 3: Block EE needs a #1: #1 MUST go in Cell D4…
2				9			7		4		(because #4 is in Row 5 @ H5 which excludes Cell F5)
3	7	9			3	4		2			(OR #1 is in Rows 5 & 6: #1 MUST go in Cell D4…)
4				1	6	3	8	9
5				2	7		3	4	1		Step 4: #5 is in Rows 7 & 9: #5 MUST go in Cell C8…
6		1	7	4	9	8
7			3	7			6	5			Step 5: #7 is in Rows 1 & 3: #7 MUST go in Cell G2…
8	8	7	5	3	4			1	2		(because #7 is in Column H @ H9 which excludes Cell H2)
9		6	1		5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 6: Only 1 cell left in Block EE:
2				9			7		4		#5 MUST go in Cell F5…
3	7	9			3	4		2
4				1	6	3	8	9			Step 7: Row 8 needs 2 more #s: #6 & #9:
5				2	7	5	3	4	1		#9 can't go in Cell F8 since #9 is in Column F (F9):
6		1	7	4	9	8					therefore #6 MUST go in Cell F8 and #9 in Cell G8…
7			3	7			6	5
8	8	7	5	3	4	6	9	1	2
9		6	1		5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 8: #7 is in Rows 5 & 6: #7 MUST go in Cell I4…
2				9			7		4
3	7	9			3	4		2			Step 9: #9 is in Rows 8 & 9: #9 MUST go in Cell A7
4				1	6	3	8	9	7		(because #9 is in Column B @ B3 & excludes Cell B7)
5				2	7	5	3	4	1
6		1	7	4	9	8
7	9		3	7			6	5
8	8	7	5	3	4	6	9	1	2
9		6	1		5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 10: Now we have #9 in Columns A & B:
2				9			7		4		#9 MUST go in Cell C5 (NB: #9 is in Row 4 & excludes C4)
3	7	9			3	4		2
4				1	6	3	8	9	7		Step 11: Only need 1 # in Block II: #8 goes in I7…
5			9	2	7	5	3	4	1
6		1	7	4	9	8					Step 12: Block HH requires #s 1, 2 & 8:
7	9		3	7			6	5	8		Since #8 can't go in cells E7 or F7 (#8 is already in Row 7)
8	8	7	5	3	4	6	9	1	2		#8 MUST go in Cell D9…
9		6	1	8	5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 13: #8 is in Columns D & F: #8 MUST go in Cell E2…
2				9	8		7		4
3	7	9			3	4		2			Step 14: Only need 1 # for Column E: #1 MUST go in Cell E7.
4				1	6	3	8	9	7
5			9	2	7	5	3	4	1		Step 15: #2 is in Columns H & I: #2 MUST go in Cell G6…
6		1	7	4	9	8	2
7	9		3	7	1		6	5	8
8	8	7	5	3	4	6	9	1	2
9		6	1	8	5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 16: Block FF needs 2 #s: #5 & 6:
2				9	8		7		4		#5 MUST go in Cell I6 (since #5 is in Column H @ H7);
3	7	9			3	4		2			only cell left in Block FF is H6 which must be #6…
4				1	6	3	8	9	7
5			9	2	7	5	3	4	1		Step 17: Row 9 needs 1 more #: #2 MUST go in Cell A9…
6		1	7	4	9	8	2	6	5
7	9		3	7	1		6	5	8
8	8	7	5	3	4	6	9	1	2
9	2	6	1	8	5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 18: Block HH needs 1 #: #2 MUST go in Cell F7…
2				9	8		7		4
3	7	9			3	4		2			Step 19: Block GG needs 1 #: #4 MUST go in Cell B7…
4	4			1	6	3	8	9	7
5			9	2	7	5	3	4	1		Step 20: #4 is now in Columns B & C: # 4 MUST go in Cell A4
6		1	7	4	9	8	2	6	5		because #4's in Rows 5 & 6 exclude Cells A5 & A6;
7	9	4	3	7	1	2	6	5	8
8	8	7	5	3	4	6	9	1	2
9	2	6	1	8	5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 21: Column F needs 1#: #1 MUST go in Cell F2…
2				9	8	1	7		4
3	7	9			3	4		2			Step 22: #5 is in Rows 5 & 6: #5 MUST go in Cell B4
4	4	5	2	1	6	3	8	9	7		(because #5 in Column C @ C8 excludes Cell C4)
5			9	2	7	5	3	4	1
6		1	7	4	9	8	2	6	5		Step 23: #2 is in Rows 5 & 6: #2 MUST go in Cell C4…
7	9	4	3	7	1	2	6	5	8		(NB: this also is the last remaining cell for Row 4…)
8	8	7	5	3	4	6	9	1	2
9	2	6	1	8	5	9	4	7	3
	A	B	C	D	E	F	G	H	I
1			4		2	7			9		Step 24: Row 5 needs 2 more #s: #6 & 8:
2				9	8	1	7		4		#6 MUST go in Cell A5 (since #6 is in Column B @ B9)
3	7	9			3	4		2			and the last remaining cell in Row 5: Cell B5 MUST be #8
4	4	5	2	1	6	3	8	9	7
5	6	8	9	2	7	5	3	4	1		Step 25: Onlly 1 cell left in Block DD:
6	3	1	7	4	9	8	2	6	5		#3 MUST go in Cell A6…
7	9	4	3	7	1	2	6	5	8