Not quite.
You are thinking of the end of 1997-98. Our last 4 games were
25th April H WBA L2-4 (Stuart pen, Marcelo)
28th April A Tranmere D3-3 (Quinn, Saunders, Devlin)
30th April A Crewe L1-2 (Hamilton)
3rd May A Stockport L0-1
Had Birmingham won their last game that Stockport defeat would have meant we failed to get the last play off place. As it was they drew 0-0, and we qualified on goals scored, which for some strange reason replaced goal difference that season. Had GD applied, Birmingham would have got 6th place.