Easy Puzzle #24 - 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			8				2	6			Easy Puzzle #24 - October 24, 2005
2	2		4	9	8						One possible Solution Method follows below…
3	5	1		6				3	8
4	7		6		1			9
5		2		3		4		1
6		9			6		3		2
7	6	8				1			3
8					5	9	8		6
9		5	2				7
	A	B	C	D	E	F	G	H	I
1			8				2	6			Step 1: #6 is in Columns A & C: #6 MUST go in Cell B2
2	2	6	4	9	8						(cf #6 in Row 1 @ I1 excludes use of Cell B1)
3	5	1		6				3	8
4	7		6		1			9			Step 2: #8 is in Columns G & I: #8 MUST go in Cell H6
5		2		3		4		1
6		9			6		3	8	2
7	6	8				1			3
8					5	9	8		6
9		5	2				7
	A	B	C	D	E	F	G	H	I
1			8				2	6			Step 3: #8 is in Column B & C: #8 MUST go in Cell A5
2	2	6	4	9	8						(cf #8 in row 6 @ H6 excludes use of Cell A6)
3	5	1		6				3	8
4	7		6		1			9			Step 4: #9 is in Columns D & F: #9 MUST go in Cell E5…
5	8	2		3	9	4		1
6		9			6		3	8	2
7	6	8				1			3
8					5	9	8		6
9		5	2				7
	A	B	C	D	E	F	G	H	I
1			8				2	6			Step 5: #6 is in Columns H & I: #6 MUST go in Cell G5
2	2	6	4	9	8						(cf #6 in row 4 @ C4 excludes use of Cell G4)
3	5	1		6				3	8
4	7		6		1			9
5	8	2		3	9	4	6	1
6		9			6		3	8	2
7	6	8				1			3
8					5	9	8		6
9		5	2				7
	A	B	C	D	E	F	G	H	I
1			8				2	6			Step 6: Block II needs #1: #1 MUST go in Cell I9
2	2	6	4	9	8		1				(NB: #1 in Column H @ H5 excludes use of H7,H8,H9
3	5	1		6				3	8		& #1 in Row 7 @ F7 excludes use of G7)
4	7		6		1			9
5	8	2		3	9	4	6	1			Step 7: Block CC needs #1: #1 MUST go in Cell G2
6		9			6		3	8	2		(cf #1 in Columns H & I exclude Cells H2, I1 & I2,
7	6	8				1			3		& #1 in Row 3 @ B3 excludes Cell G3)
8					5	9	8		6
9		5	2				7		1
	A	B	C	D	E	F	G	H	I
1			8	1			2	6			Step 8: #1 is in Rows 2 & 3: #1 MUST go in Cell D1
2	2	6	4	9	8		1				(#1 in Column E @ E4 excludes use of Cell E1, &
3	5	1		6				3	8		#1 in Column F @ F7 excludes use of Cell F1)
4	7	3	6		1			9
5	8	2		3	9	4	6	1			Step 9: #3 is in Rows 5 & 6: #3 MUST go in Cell B4…
6		9			6		3	8	2
7	6	8				1			3
8					5	9	8		6
9		5	2				7		1
	A	B	C	D	E	F	G	H	I
1			8	1			2	6			Step 10:  Block DD needs #4: #4 MUST go in Cell A6
2	2	6	4	9	8		1				(NB: #4 in Column C @ C2 excludes use of C5 & C6
3	5	1		6				3	8
4	7	3	6		1			9
5	8	2		3	9	4	6	1
6	4	9			6		3	8	2
7	6	8				1			3
8					5	9	8		6
9		5	2				7		1
	A	B	C	D	E	F	G	H	I
1			8	1			2	6			Step 11: Complete Block DD: need #s 1 & 5…
2	2	6	4	9	8		1				#1 can't go in Cell C5 (cf #1 in Row 5 @ H5), so
3	5	1		6				3	8		#1 MUST go in Cell C6, & therefore #5 MUST go in Cell C5
4	7	3	6		1			9
5	8	2	5	3	9	4	6	1			Step 12: #1 is in Rows 7 & 9: #1 MUST go in Cell A8
6	4	9	1		6		3	8	2		(cf #1 in Column B @ B3 excludes use of Cell B8, &
7	6	8				1			3		#1 in Column C @ C6 excludes use of Cell C8)
8	1				5	9	8		6
9		5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3		8	1			2	6			Step 13: Complete Row 5: #7 MUST go in Cell I5…
2	2	6	4	9	8		1
3	5	1		6				3	8		Step 14: Block AA needs #3: #3 MUST go in Cell A1
4	7	3	6		1			9			(#3 in Column B excludes Cell B1, & #3 in Row 3 @ H3
5	8	2	5	3	9	4	6	1	7		excludes use of Cell C3)
6	4	9	1		6		3	8	2
7	6	8				1			3		Step 15: Now #3 is in Columns A & B: #3 MUST go in Cell C8
8	1		3		5	9	8		6		(#3 in Row 7 @ I7 excludes use of Cell C7)
9		5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1			2	6			Step 16: Complete Block AA: need #s 7 & 9…
2	2	6	4	9	8		1				#9 can't go in Cell B1 (cf #9 in Column B @ B6), so
3	5	1	9	6				3	8		#9 MUST go in Cell C3, & therefore #7 MUST go in Cell B1
4	7	3	6		1			9
5	8	2	5	3	9	4	6	1	7
6	4	9	1		6		3	8	2
7	6	8				1			3
8	1		3		5	9	8		6
9		5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1			2	6			Step 17: Complete Column A: #9 MUST go in Cell A9…
2	2	6	4	9	8		1
3	5	1	9	6				3	8		Step 18: Complete Column B: #4 MUST go in Cell B8...
4	7	3	6		1			9
5	8	2	5	3	9	4	6	1	7		Step 19: Complete Column C (& Block GG):
6	4	9	1		6		3	8	2		#7 MUST go in Cell C7…
7	6	8	7			1			3
8	1	4	3		5	9	8		6
9	9	5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1			2	6	9		Step 20: Block II needs #9: #9 MUST go in Cell G7
2	2	6	4	9	8		1				(cf #9 in Column H excludes use of Cells, H7, H8 & H9)
3	5	1	9	6				3	8
4	7	3	6		1			9			Step 21: Now #9 is in Columns G & H: #9 MUST go in Cell I1
5	8	2	5	3	9	4	6	1	7		(cf #9 in Row 2 @ D2 excludes use of Cell I2)
6	4	9	1		6		3	8	2
7	6	8	7			1	9		3
8	1	4	3		5	9	8		6
9	9	5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 22: Complete Row 1: need #s 4 & 5…
2	2	6	4	9	8		1				#4 can't go in Cell F1 (cf #4 in Column 4 @ F5), so
3	5	1	9	6				3	8		#4 MUST go in Cell E1, & therefore #5 MUST go in Cell F1
4	7	3	6		1			9
5	8	2	5	3	9	4	6	1	7		Step 23: Complete Row 6: need #s 5 & 7…
6	4	9	1	5	6	7	3	8	2		#5 can't go in Cell F6 (see #5 added in Step 22 @ F1), so
7	6	8	7			1	9		3		#5 MUST go in Cell D6, & therefore #7 MUST go in Cell F6
8	1	4	3		5	9	8		6
9	9	5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 24: Block CC needs #4: #4 MUST go in Cell G3
2	2	6	4	9	8		1				(cf #4 in Row 2 @ C2 excludes use of Cells H2 & I2)
3	5	1	9	6			4	3	8
4	7	3	6		1			9	4		Step 25: Block FF needs #4: #4 MUST go in Cell I4
5	8	2	5	3	9	4	6	1	7		(cf #4 added in Step 24 excludes use of Cell G4)
6	4	9	1	5	6	7	3	8	2
7	6	8	7			1	9		3
8	1	4	3		5	9	8		6
9	9	5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 26: Complete Row 3: need #s 2 & 7…
2	2	6	4	9	8		1				#7 can't go in Cell F3 (cf #7 in Column F @ F6), so
3	5	1	9	6	7	2	4	3	8		#7 MUST go in Cell E3, & therefore #2 MUST go in Cell F3
4	7	3	6		1		5	9	4
5	8	2	5	3	9	4	6	1	7		Step 27: Complete Block FF: #5 MUST go in Cell G4...
6	4	9	1	5	6	7	3	8	2
7	6	8	7			1	9		3
8	1	4	3		5	9	8		6
9	9	5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 28: Complete Row 4: need #s 2 & 8…
2	2	6	4	9	8		1				#2 can't go in Cell F4 (cf #2 in Column F @ F3), so
3	5	1	9	6	7	2	4	3	8		#2 MUST go in Cell D4, & therefore #8 MUST go in Cell F4
4	7	3	6	2	1	8	5	9	4
5	8	2	5	3	9	4	6	1	7		Step 29: Complete Row 8: need #s 2 & 7…
6	4	9	1	5	6	7	3	8	2		#2 can't go in Cell D8 (cf #2 added in Step 28 @ D4), so
7	6	8	7			1	9		3		#2 MUST go in Cell H8, & therefore #7 MUST go in Cell D8
8	1	4	3	7	5	9	8	2	6
9	9	5	2				7		1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 30: Complete Column D: need #s 4 & 8…
2	2	6	4	9	8		1				#8 can't go in Cell D7 (cf #8 in Row 7 @ B7), so
3	5	1	9	6	7	2	4	3	8		#8 MUST go in Cell D9, & therefore #4 MUST go in Cell D7
4	7	3	6	2	1	8	5	9	4
5	8	2	5	3	9	4	6	1	7		Step 31: Complete Block II: need #s 4 & 5…
6	4	9	1	5	6	7	3	8	2		#4 can't go in Cell H7 (cf #4 added in Step 30 @ D7), so
7	6	8	7	4		1	9	5	3		#4 MUST go in Cell H9, & therefore #5 MUST go in Cell H7
8	1	4	3	7	5	9	8	2	6
9	9	5	2	8			7	4	1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 32: Complete Block BB: #3 MUST go in Cell F2...
2	2	6	4	9	8	3	1	7	5
3	5	1	9	6	7	2	4	3	8		Step 33: Complete Block CC: need #s 5 & 7…
4	7	3	6	2	1	8	5	9	4		#7 can't go in Cell I2 (cf #7 in Column I @ I5), so
5	8	2	5	3	9	4	6	1	7		#7 MUST go in Cell H2, & therefore #5 MUST go in Cell I2
6	4	9	1	5	6	7	3	8	2
7	6	8	7	4		1	9	5	3
8	1	4	3	7	5	9	8	2	6
9	9	5	2	8			7	4	1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9		Step 34: Complete Column E: need #s 2 & 3…
2	2	6	4	9	8	3	1	7	5		#2 can't go in Cell E9 (cf #2 in Row 9 @ C9), so
3	5	1	9	6	7	2	4	3	8		#2 MUST go in Cell E7, & therefore #3 MUST go in Cell E9
4	7	3	6	2	1	8	5	9	4
5	8	2	5	3	9	4	6	1	7		Step 35: Complete Column F (& Block HH & the Puzzle):
6	4	9	1	5	6	7	3	8	2		#6 MUST go in Cell F9.
7	6	8	7	4	2	1	9	5	3
8	1	4	3	7	5	9	8	2	6
9	9	5	2	8	3	6	7	4	1
	A	B	C	D	E	F	G	H	I
1	3	7	8	1	4	5	2	6	9	45	Final Proof:
2	2	6	4	9	8	3	1	7	5	45	- All Rows add up to 45;
3	5	1	9	6	7	2	4	3	8	45
4	7	3	6	2	1	8	5	9	4	45
5	8	2	5	3	9	4	6	1	7	45
6	4	9	1	5	6	7	3	8	2	45
7	6	8	7	4	2	1	9	5	3	45
8	1	4	3	7	5	9	8	2	6	45
9	9	5	2	8	3	6	7	4	1	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