Medium Puzzle #38 - 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	1	7					8		9		Medium Puzzle #38 - November 7, 2005
2	6	8						3			Original puzzle as published © joe-ks.com
3			4	3	7		6		2
4			7	1	2
5			1	6	3
6						9	1	2	3
7	3		8			2	9	7	5
8		1				3	2	6	4
9	2		5			7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7					8		9		Step 1: #7 is in Columns B & C: #7 MUST go in Cell A8…
2	6	8						3
3			4	3	7		6	1	2		Step 2: #1 is in Columns G & I: #1 MUST go in Cell H3
4			7	1	2						(#1 in Row 1 @ A1 excludes use of Cell H1)
5			1	6	3
6						9	1	2	3
7	3		8			2	9	7	5
8	7	1				3	2	6	4
9	2		5			7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3				8		9		Step 3: #8 is in Rows 1 & 2: #8 MUST go in Cell F3...
2	6	8						3
3			4	3	7	8	6	1	2		Step 4: #3 is in Rows 5 & 6: #3 MUST go in Cell B4
4		3	7	1	2						(#3 in Column A @ A7 excludes use of Cell A4)
5			1	6	3
6						9	1	2	3		Step 5: #3 is now in Columns A & B: #3 MUST go in Cell C1
7	3		8			2	9	7	5		(#3 in Row 2 @ H2 excludes use of Cell C2)
8	7	1				3	2	6	4
9	2		5			7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3				8		9		Step 6: Block A needs #2: #2 MUST go in Cell C2
2	6	8	2					3			(#2 in Row 3 @ I3 excludes use of Cells A3 & B3)
3			4	3	7	8	6	1	2
4		3	7	1	2						Step 7: now #2 is in Column A & C: #2 MUST go in Cell B5
5		2	1	6	3						(#2 in Row 6 @ H6 excludes use of Cell B6)
6						9	1	2	3
7	3		8		1	2	9	7	5		Step 8: #1 is in Rows 8 & 9: #1 MUST go in Cell E7
8	7	1				3	2	6	4		(#1 in Column D @ D4 excludes use of Cell D7)
9	2		5			7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3				8		9		Step 9: #1 is in Columns D & E: #1 MUST go in Cell F2
2	6	8	2			1		3			(#1 in Row 1 @ A1 excludes use of Cell F1)
3			4	3	7	8	6	1	2
4		3	7	1	2				6		Step 10: #6 is in Columns G & H: #6 MUST go in Cell I4
5		2	1	6	3						(#6 in Row 5 @ D5 excludes use of Cell I5)
6						9	1	2	3
7	3		8		1	2	9	7	5
8	7	1				3	2	6	4
9	2		5			7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3				8		9		Step 11: Complete Row 7: need #s 4 & 6…
2	6	8	2			1		3
3			4	3	7	8	6	1	2		Step 12: #6 is now in Columns A & B: #6 MUST go in Cell C6
4		3	7	1	2				6
5		2	1	6	3						Step 13: Complete Column C: #9 MUST go in Cell C8…
6			6			9	1	2	3
7	3	6	8	4	1	2	9	7	5		Step 14: Complete Block GG: #4 MUST go in Cell B9…
8	7	1	9			3	2	6	4
9	2	4	5			7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3			6	8		9		Step 15: Complete Row 9: need #s 6 & 9…
2	6	8	2			1		3			#6 can't go in Cell D9 (cf #6 in Column D @ D5), so
3			4	3	7	8	6	1	2		#6 MUST go in Cel E9, & therefore #9 MUST go in Cell D9
4		3	7	1	2				6
5		2	1	6	3				8		Step 16: #6 is now in Columns D & E: #6 MUST go in Cell F1
6			6			9	1	2	3
7	3	6	8	4	1	2	9	7	5		Step 17: #8 is in Columns G & H: #8 MUST go in Cell I5…
8	7	1	9			3	2	6	4
9	2	4	5	9	6	7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3			6	8		9		Step 18: #7 is in Columns E & F: #7 MUST go in Cell D6...
2	6	8	2			1		3	7
3			4	3	7	8	6	1	2		Step 19: #7 is now in Rows 4 & 6: #7 MUST go in Cell G5
4		3	7	1	2				6		(#7 in Column H @ H7 excludes use of Cell H5)
5		2	1	6	3		7		8
6			6	7		9	1	2	3		Step 20: Complet Column I: #7 MUST go in Cell I2...
7	3	6	8	4	1	2	9	7	5
8	7	1	9			3	2	6	4
9	2	4	5	9	6	7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3			6	8		9		Step 21: Block EE needs #8: #8 MUST go in Cell E6
2	6	8	2			1		3	7		(#8 in Column F @ F8 excludes use of Cells F4 & F5)
3			4	3	7	8	6	1	2
4	8	3	7	1	2				6		Step 22: #8 is now in Columns 5 & 6: #8 MUST go in Cell A4
5		2	1	6	3		7		8
6			6	7	8	9	1	2	3		Step 23: Complete Row 8: need #s 5 & 8…
7	3	6	8	4	1	2	9	7	5		#8 can't go in Cell E8 (cf #8 from Step 21 @ E6), so
8	7	1	9	8	5	3	2	6	4		#8 MUST go in Cell D8, & therefore #5 MUST go in Cell E8
9	2	4	5	9	6	7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3			6	8		9		Step 24: Block DD needs #9: #9 MUST go in Cell A5
2	6	8	2			1		3	7		(#9 in Row 6 @ F6 excludes use of Cells A6 & B6)
3			4	3	7	8	6	1	2
4	8	3	7	1	2			9	6		Step 25: #9 is now in Rows 5 & 6: #9 MUST go in Cell H4
5	9	2	1	6	3		7		8		(#9 in Column G @ G7 excludes use of Cell G4)
6			6	7	8	9	1	2	3
7	3	6	8	4	1	2	9	7	5
8	7	1	9	8	5	3	2	6	4
9	2	4	5	9	6	7	3	8	1
	A	B	C	D	E	F	G	H	I
1	1	7	3			6	8		9		Step 26: Complete Block AA: need #s 5 & 9…
2	6	8	2		9	1		3	7		#9 can't go in Cell A3 (cf #9 in Column A @ A5), so
3	5	9	4	3	7	8	6	1	2		#9 MUST go in Cell B3, & therefore #5 MUST go in Cell A3
4	8	3	7	1	2			9	6
5	9	2	1	6	3		7		8		Step 27: #9 is now in Rows 1 & 3: #9 MUST go in Cell E2
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