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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

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2 7
  

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8
3   

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  B = 2

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7 9
  

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  C = 8

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  F = 3

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6   

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3   

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  D = 2

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1   

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9   

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5
8 2   

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2
8   

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3   

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  I = 2

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  K = 5

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4 3
  J = 5

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1   

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2   E = 8

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9   G = 3

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  H = 2

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5 8
  

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