Endgame Riddle Botvinnik vs Pachman – Solution

A few weeks ago, Karsten Müller treated ChessBase readers to another endgame riddle. Charles Sullivan had come across an interesting endgame with opposite-coloured bishops that occurred in Botvinnik vs Pachman, Chess Olympiad Leipzig 1960, and Charles was curious whether Pachman had a draw with best play. The ChessBase readers came up with more than one answer.