Problem with self-referral

How can I write an formula for a cell which evaluates the content of that cell, then performs the rest of the equation if the cell is blank, but leaves the cell unchanged if it is not blank?

This is for a chess tournament pairing algorithm. Each row in the table represents a unique, numbered player. The cell (actually, column of cells) is blank unless a checkbox above it is TRUE. Scores from the previous round are entered and then the table is sorted based on the running scores of the players (descending) before the checkbox is checked. The formula evaluates the following in nested IF statements:
1. Is the checkbox TRUE? (So that no pairings are made before the previous round's scores are all entered)
2. If there are an odd number of players AND this is the last player, enter "Bye".
3. If there is no player name assigned to this row, enter "".
4. If another cell in the column contains this row's player number, then LOOKUP and enter that other player's number.
5. If the cell is not blank, do not change it. (So that the rest of the formula is skipped if there is already an assignment)
6. If the row cell in the row above is blank, enter "". (So that pairings are made from the top-down)
7. Assign a match based on further criteria.
My problem so far is that the sorting falls apart if I cannot complete step #5, which gives an error for self-referral.
=IF(NOT(checkbox),"",
    IF(AND(odd number of players,this islast row of players),"Bye",
        IF(ISBLANK(player name for this row),"",
            IF(NOT(ISERROR(MATCH(player number,column of assignments,0))),
                LOOKUP(player number,column of assignments,column of player numbers),
#5 would go here!!!!
                IF(AND(ISBLANK(cell above this one),ROW()>6),"",
                    OFFSET($A8,
                        IF(ROW()+$K$2-5<=$E$2,$K$2,$K$2-$E$2),0)

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Edited by: akyra on Jan 14, 2008 4:36 AM
Edited by: akyra on Jan 14, 2008 4:37 AM
Edited by: akyra on Jan 14, 2008 4:37 AM

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