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## How to Solve Su Doku Puzzles without pencil marks or reduce the number of pencil marks needed to sovle a puzzle

See Su Doku Puzzle below
Strategy

A.      A = 3 : The clue "3" in cell (row 5 column 1) eliminates "3" from column 1. The clue "3" in cell (row 9 column 3) eliminates "3" from column 3. The clue "3" in cell (row 2 column 4) eliminates "3" from row 2. Cell (row 1 column 2) is the only cell that can have "3" in Box 1.

B.      B = 2 : The clue "2" in cell (row 9 column 4) eliminates "2" from column 4. The clue "2" in cell (row 6 column 5) eliminates "2" from column 5. The clue "2" in cell (row 3 column 2) eliminates "2" from row 3. Cell (row 2 column 6) is the only cell that can have "2" in Box 2.

C.    C = 8 : The clue "8" in cell (row 5 column 7) eliminates "8" from column 7. The clue "8" in cell (row 8 column 9) eliminates "8" from column 9. The clue "8" in cell (row 1 column 6) eliminates "8" from row 1. Cell (row 3 column 8) is the only cell that can have "8" in Box 3.

D.    D = 2 : The clue "2" in cell (row 6 column 5) eliminates "2" from row 6. The clue "2" in cell (row 4 column 9) eliminates "2" from row 4. The clue "2" in cell (row 3 column 2) eliminates "2" from column 2. Cell (row 5 column 3) is the only cell that can have "2" in Box 4.

E.    E = 8 : The clue "8" in cell (row 6 column 4) eliminates "8" from column 4. The clue "8" in cell (row 1 column 6) eliminates "8" from column 6. The clue "8" in cell (row 8 column 9) eliminates "8" from row 8. Cell (row 9 column 5) is the only cell that can have "8" in Box 8.

F.    F = 3 : The clue "3" in cell (row 1 column 2) - see A - eliminates "3" from row 1. The clue "3" in cell (row 2 column 4) eliminates "3" from row 2. The clue "3" in cell (row 6 column 7) eliminates "3" from column 7. Cell (row 3 column 9) is the only cell that can have "3" in Box 3.

G.    G = 3 : The clue "3" in cell (row 6 column 7) eliminates "3" from column 7. The clue "3" in cell (row 3 column 9) - see F - eliminates "3" from column 9. The clue "3" in cell (row 9 column 3) eliminates "3" from row 9. Cell (row 7 column 8) is the only cell that can have "3" in Box 9.

H.    H = 2 : The clue "2" in cell (row 9 column 4) eliminates "2" from row 9. The clue "2" in cell (row 4 column 9) eliminates "2" from column 9. Cell (row 8 column 7) is the only cell that can have "2" in Box 9.

I.    I = 2 : The clue "2" in cell (row 3 column 2) eliminates "2" from column 2. The clue "2" in cell (row 5 column 3) eliminates "2" from column 3. The clue "2" in cell (row 9 column 4) eliminates "2" from row 9. The clue "2" in cell (row 8 column 7) eliminates "2" from row 8. Cell (row 7 column 1) is the only cell that can have "2" in Box 7.

J.    J = 5 : The clue "5" in cell (row 5 column 6) eliminates "5" from column 6. The clue "5" in cell (row 8 column 8) eliminates "5" from row 8. Cell (row 7 column 4) is the only cell that can have "5" in Box 8.

K.    K = 5 : The clue "5" in cell (row 7 column 4) eliminates "5" from row 7. The clue "5" in cell (row 8 column 8) eliminates "5" from row 8. Cell (row 9 column 1) is the only cell that can have "5" in Box 7.

 4 A = 3_ _ _ _ _ _ 2 7
 _ _ 8 3 _ B = 2_ _ _ _
 _ _ _ _ 7 9 _ C = 8_ F = 3_
 _ 6 _ 3 _ D = 2_ 1 _ _
 _ _ _ 9 _ 5 8 2 _
 _ _ 2 8 _ _ 3 _ _
 I = 2_ _ _ _ _ _ K = 5_ 4 3
 J = 5_ 1 _ _ _ _ 2 E = 8_ _
 9 G = 3_ _ H = 2_ 5 8 _ _ _

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