Easy Puzzle #48 - 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					5						Easy Puzzle #48 - November 17, 2005
2			3	1	7	9	4				Original puzzle as published © joe-ks.com
3	4	6	9	2		3	5	1	7
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8			2	8	4	7	9
9					6
	A	B	C	D	E	F	G	H	I
1			8		5		2				Step 1: #8 is in Columns A & B: #8 MUST go in Cell C1...
2			3	1	7	9	4
3	4	6	9	2	8	3	5	1	7		Step 2: #8 is in Columns D & F: #8 MUST go in Cell E3...
4	8	2	4
5	3	9	6								Step 3: #2 is in Columns H & I: #2 MUST go in Cell G1...
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8			2	8	4	7	9
9					6
	A	B	C	D	E	F	G	H	I
1			8		5	6	2				Step 4: Complete Column C: #1 MUST go in Cell C9...
2			3	1	7	9	4
3	4	6	9	2	8	3	5	1	7		Step 5: #6 is in Columns D & E: #6 MUST go in Cell F1...
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8			2	8	4	7	9
9			1		6
	A	B	C	D	E	F	G	H	I
1	1		8	4	5	6	2				Step 6: Complete Block BB: #4 MUST go in Cell D1...
2			3	1	7	9	4
3	4	6	9	2	8	3	5	1	7		Step 7: #1 is in Columns B & C: #1 MUST go in Cell A1
4	8	2	4								(#1 in Row 2 @ D2 excludes use of Cell A2)
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8			2	8	4	7	9
9			1		6
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 8: Block AA needs #7: #7 MUST go in Cell B1
2			3	1	7	9	4				(#7 in Row 2 @ E2 excludes use of Cells A2, B2 & C2)
3	4	6	9	2	8	3	5	1	7
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8			2	8	4	7	9
9			1		6
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 9: Complete Block AA: need #s 2 & 5…
2	2	5	3	1	7	9	4				#2 can't go in Cell B2 (cf #2 in Column B @ B4), so
3	4	6	9	2	8	3	5	1	7		#2 MUST go in Cell A2, & therefore #5 MUST go in Cell B2
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8			2	8	4	7	9
9			1		6
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 10: Complete Column A: need #s 5 & 6…
2	2	5	3	1	7	9	4				#6 can't go in Cell A9 (cf #6 in Row 9 @ E9), so
3	4	6	9	2	8	3	5	1	7		#6 MUST go in Cell A8, & therefore #5 MUST go in Cell A9
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6		2	8	4	7	9
9	5		1		6
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 11: Complete Block GG: need #s 3 & 4…
2	2	5	3	1	7	9	4				#4 can't go in Cell B8 (cf #4 in Row 8 @ E8), so
3	4	6	9	2	8	3	5	1	7		#4 MUST go in Cell B9, & therefore #3 MUST go in Cell B8
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9
9	5	4	1		6
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 12: Complete Block HH: need #s 2 & 9…
2	2	5	3	1	7	9	4				#2 can't go in Cell D9 (cf #2 in Column D @ D3), so
3	4	6	9	2	8	3	5	1	7		#2 MUST go in Cell F9, & therefore #9 MUST go in Cell D9
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 13: Complete Row 8: need #s 1 & 5…
2	2	5	3	1	7	9	4				#1 can't go in Cell H8 (cf #1 in Column H @ H3), so
3	4	6	9	2	8	3	5	1	7		#1 MUST go in Cell I8, & therefore #5 MUST go in Cell H8
4	8	2	4
5	3	9	6
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 14: Complete Column D: need #s 3 & 7…
2	2	5	3	1	7	9	4				#3 can't go in Cell D5 (cf #3 in Row 5 @ A5), so
3	4	6	9	2	8	3	5	1	7		#3 MUST go in Cell D4, & therefore #7 MUST go in Cell D5
4	8	2	4	3
5	3	9	6	7
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 15: Complete Column E: need #s 1 & 2…
2	2	5	3	1	7	9	4				#2 can't go in Cell E4 (cf #2 in Row 4 @ E4), so
3	4	6	9	2	8	3	5	1	7		#2 MUST go in Cell E5, & therefore #1 MUST go in Cell E4
4	8	2	4	3	1
5	3	9	6	7	2
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 16: Complete Block EE: need #s 4 & 5…
2	2	5	3	1	7	9	4				#4 can't go in Cell F4 (cf #4 in Row 4 @ C4), so
3	4	6	9	2	8	3	5	1	7		#4 MUST go in Cell F5, & therefore #5 MUST go in Cell F4
4	8	2	4	3	1	5
5	3	9	6	7	2	4
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 17: Row 5 needs #1: #1 MUST go in Cell G5
2	2	5	3	1	7	9	4				(#1 in Column H @ H3 excludes use of Cell H5, &
3	4	6	9	2	8	3	5	1	7		#1 in Column I @ I8 excludes use of Cell I5)
4	8	2	4	3	1	5
5	3	9	6	7	2	4	1
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 18: Complete Row 5: need #s 5 & 8…
2	2	5	3	1	7	9	4				#5 can't go in Cell H5 (cf #5 in Column H @ H8), so
3	4	6	9	2	8	3	5	1	7		#5 MUST go in Cell I5, & therefore #8 MUST go in Cell H5
4	8	2	4	3	1	5
5	3	9	6	7	2	4	1	8	5
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 19: Complete Column G: need #s 7 & 8…
2	2	5	3	1	7	9	4				#8 can't go in Cell G4 (cf #8 in Row 4 @ A4), so
3	4	6	9	2	8	3	5	1	7		#8 MUST go in Cell G9, & therefore #7 MUST go in Cell G4
4	8	2	4	3	1	5	7
5	3	9	6	7	2	4	1	8	5		Step 20: #7 is now in Columns G & I: #7 MUST go in Cell H9…
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2		Step 21: Complete Block II: #3 MUST go in Cell I9…
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2	8	7	3
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2				Step 22: Complete Row 2: need #s 6 & 8…
2	2	5	3	1	7	9	4	6	8		#8 can't go in Cell H2 (cf #8 in Column H @ H5), so
3	4	6	9	2	8	3	5	1	7		#8 MUST go in Cell I2, & therefore #6 MUST go in Cell H2
4	8	2	4	3	1	5	7		6
5	3	9	6	7	2	4	1	8	5		Step 23: #6 is now in Columns G & H: #6 MUST go in Cell I4...
6	7	1	5	6	9	8	3	2	4
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2	8	7	3
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2	3	9		Step 24: Complete Column I: #9 MUST go in Cell I1...
2	2	5	3	1	7	9	4	6	8
3	4	6	9	2	8	3	5	1	7		Step 25: Complete Block CC: #3 MUST go in Cell H1...
4	8	2	4	3	1	5	7	9	6
5	3	9	6	7	2	4	1	8	5		Step 26: Complete Block FF (& Puzzle):
6	7	1	5	6	9	8	3	2	4		#9 MUST go in Cell H4.
7	9	8	7	5	3	1	6	4	2
8	6	3	2	8	4	7	9	5	1
9	5	4	1	9	6	2	8	7	3
	A	B	C	D	E	F	G	H	I
1	1	7	8	4	5	6	2	3	9	45	Final Proof:
2	2	5	3	1	7	9	4	6	8	45	- All Rows add up to 45;
3	4	6	9	2	8	3	5	1	7	45
4	8	2	4	3	1	5	7	9	6	45
5	3	9	6	7	2	4	1	8	5	45
6	7	1	5	6	9	8	3	2	4	45
7	9	8	7	5	3	1	6	4	2	45
8	6	3	2	8	4	7	9	5	1	45
9	5	4	1	9	6	2	8	7	3	45
	45	45	45	45	45	45	45	45	45		- All Columns add up to 45;
	45			45			45				- All 3x3 Blocks add up to 45…
	45			45			45
	45			45			45