An interesting Laokoon-like offer was possible after 55. ... 23-29! 56. 24x33 12-18! 57. 22x13 48-26!! White who played to win should accept draw after 58.13-9. Without black 14 and white 25 the position will be winning for black.    

55. ... 23-29 56. 24x33 12-18 57. 22x13 48-26 58. 13-09 26x35 59. 09x20