In this game John could won three times.

First
Analysis by Stockfish 120419 64 POPCNT:

1. +- (9.43): 33.Rea1 f4 34.gxf4 Bxf4 35.Nxb7 Qxb7 36.Bf3 Qb5 37.Qe2 Rf7 38.Rxa6 Qd7 39.c6 Qe8 40.Ra7 Bg5 41.Rxf7 Qxf7 42.Kg2 Bd8 43.Rf1 Bc7 44.Be4 Qe7 45.Qg4 Rf8 46.Rf6 Bd8 47.Bd4 Rxf6 48.exf6 Qf7 49.b5 Bxf6 50.Bxf6 Qxf6 51.c7

2. +- (8.33): 33.Rxa6 Bxa6 34.Qxa6 Qc7 35.Kg2 Bxc5 36.bxc5 Qxc5 37.Bc4 g6 38.Rd1 Kg7 39.Bd4 Qc7 40.Kf2 h6 41.Qa2 Rb4 42.Bxe6 Rxd4 43.Rxd4 Qc5 44.Qd5 Qxd5 45.Bxd5 Rxe5 46.Nb7 Re7 47.Nc5 Kf6 48.Bc6 Rg7 49.Rd6+ Ke5 50.Re6+ Kd4 51.Na6 Kd3 52.Nb4+ Kd4 53.Nd5 Kc5 54.Ne7

Second

Analysis by Stockfish 120419 64 POPCNT:

1. +- (47.95): 52.Qxf5 Qxc3 53.e7 Qd2+ 54.Kh3 Qh6+ 55.Kg4 Qd6 56.Be4 g6 57.exd8R+ Qxd8 58.Qe5+ Kg8 59.Bd5+ Kf8 60.Qh8+ Ke7 61.Qxh7+ Kd6 62.Qxg6+ Kc5 63.Qc6+ Kb4 64.h4 Qf8 65.h5 Qg7+ 66.Kh3 Qh8 67.h6 Qf8 68.Qb6+ Ka4 69.Be4 Qf1+ 70.Kh4 Qe2 71.Qd4+ Ka5 72.Qc5+ Ka6 73.Qc6+ Ka5 74.h7 Qh2+ 75.Kg4 Kb4 76.Qd5 Ka3 77.Qa8+ Kb4

Followed moves (52.Qd4 etc.) were done in the game but John didn't finded right way.

2. +- (15.39): 52.Qd4 Qe7 53.Qe5 Rf8 54.Bd4 h6 55.Bc6 Rf6 56.Bd7 Kh7 57.Bc5 Qd8 58.e7 Qxd7 59.e8Q Qb7+ 60.Kh3 Qf3 61.Qe2 Qxe2 62.Qxe2 Rg6 63.Qe8 h5 64.Qe5 Rg4 65.Qxf5+ g6 66.Qf7+ Kh6 67.Bf8+ Kg5 68.Be7+ Kh6

Third. John should move white color bishop!

Analysis by Stockfish 120419 64 POPCNT:

1. +- (#19): 57.Bd7 Kh7 58.Bc5 Qd8 59.e7 Qxd7 60.e8Q Qxe8 61.Qxe8 h5 62.Qd7 Kg8 63.Bd4 Rg6 64.Qe8+ Kh7 65.Qf7 f4 66.Qf5 Kh6 67.Qxf4+ Kh7 68.Qe4 Kh6 69.Be3+ Kh7 70.Qf5 Kg8 71.Qxg6 Kf8 72.Bc5+ Kg8 73.Qxh5 g6 74.Qxg6+ Kh8 75.Bd4#