user20721: ICCF uses pure numerical notation counting each square by row and column  eg  11 to 88.  So Pd4 often written just d4 -  would be 2224 so there can never be any confusion should two pieces be able to move to the same square. 
If One used that notation in an OTB tournament would FIDE accept it or would that be a problem?

user19877: Neither appears to allow numerical notation.
FIDE requires algebraic notation. 

Article 8: The recording of the moves
  8.1.1     
In the course of play each player is required to record his own moves
  and those of his opponent in the correct manner, move after move, as
  clearly and legibly as possible, in the algebraic notation (Appendix
  C), on the ‘scoresheet’ prescribed for the competition.

The USCF prefers algebraic, but also permits descriptive or "computer notation".


The Recording of Games15A. Manner of keeping score.In the course of play each player is required to record the game (both the player’s
  and the opponent’s moves), move after move, as clearly and legibly as
  possible, on the scoresheetprescribed for the competition. Algebraic
  notationis standard, but descriptive or computer notation is
  permitted.


I cannot find a definition for "computer notation" in their rules.

20721: <p>ICCF uses pure numerical notation counting each square by row and column  eg  11 to 88.  So Pd4 often written just d4 -  would be 2224 so there can never be any confusion should two pieces be able to move to the same square. </p>

<p>If One used that notation in an OTB tournament would FIDE accept it or would that be a problem?</p>
 19877: <p>Neither appears to allow numerical notation.</p>

<p><a href="https://old.fide.com/fide/handbook.html?id=208&amp;view=article" rel="noreferrer">FIDE requires algebraic notation.</a> </p>

<blockquote>
  <p>Article 8: The recording of the moves
  8.1.1     </p>
  
  <p>In the course of play each player is required to record his own moves
  and those of his opponent in the correct manner, move after move, as
  clearly and legibly as possible, in the algebraic notation (Appendix
  C), on the ‘scoresheet’ prescribed for the competition.</p>
</blockquote>

<p><a href="http://www.uschess.org/docs/gov/chessrules/US_Chess_Rule_Book-%20Online_Only_Edition_v7.1-1.2.11-7.19.19.pdf" rel="noreferrer">The USCF prefers algebraic, but also permits descriptive or "computer notation".</a></p>

<blockquote>
  <ol start="15">
  <li>The Recording of Games15A. Manner of keeping score.In the course of play each player is required to record the game (both the player’s
  and the opponent’s moves), move after move, as clearly and legibly as
  possible, on the scoresheetprescribed for the competition. Algebraic
  notationis standard, but descriptive or computer notation is
  permitted.</li>
  </ol>
</blockquote>

<p>I cannot find a definition for "computer notation" in their rules.</p>
