The main line:

1...Bc4+! 2.Bd5! Bxd5+! 3.exd5 e2! 4.d8Q! e1Q+ 5.Kd7 c1Q! 6.Qb8+! Ka6 7.c8Q+ Qxc8+ 8.Qxc8+ Kb5 9.Qc6+ Kb4 10.Qb6+! Kc3 11.Qc5+ Kb2 12.Qd4+ Kc2 13.Qc4+ Kb2 14.Qd4+ Kb1! 15.Qd3+! Ka2! 16.e8Q! f1Q 17.Qa8+ Kb2 18.Qh8+! Ka2/Ka3 19.Qa8+!=.

½ - ½. 

Perpetual check (positional draw).

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The main line with the variations:

1...Bc4+! [1...d1Q 2.e8Q Qg4+ 3.Ke5 Qg3+ 4.Ke6 Qh3+ 5.Ke5 Qh2+ 6.Ke6 Qh6+ 7.Ke5 Qg5+ 8.Ke6 Bxb7 9.Qb8+ Ka6 10.Qxb7+ Kxb7 11.c8Q+ Ka7 12.Qc7+ Ka6 13.Qc6+ Ka5 14.Qc3+=; 1...f1Q 2.e8Q Qh3+ (2...Bxb7? 3.Qb8+ Ka6 4.Qxb7+ Kxb7 5.c8Q+ Ka7 6.Qc7+ Ka6 7.Qc6+ Ka7 8.Qc5+ Ka6 9.Qa3+ Kb5 10.Qxb3+ Ka6 11.Qa4+ Kb7 12.Ke7 Qa6 13.Qb4+ Qb6 14.Qxb6+ Kxb6 15.d8Q++-) 3.Ke5=; 1...c1Q? 2.e8Q Bxb7 3.Qb8+ Ka6 4.c8Q Bxc8 5.dxc8Q+ Qxc8+ 6.Qxc8+ Kb5 7.Qb7+ Kc4 8.Qd5+ Kc3 9.d7 f1Q 10.d8Q+-; 1...Kxb7? 2.c8Q++-; 1...Bxb7 2.e8Q d1Q (2...f1Q 3.Qb8+ Ka6 4.Qxb7+ Kxb7 5.c8Q+ Ka7 6.Qc5++- see 1...f1Q and 2...Bxb7?; 2...c1Q 3.Qb8++- see 1...c1Q?) 3.Qb8+ Ka6 4.Qxb7+ Ka5 5.Qa7+ (5.c8Q Qg4+=) 5...Kb4 6.c8Q Qg4+=] 2.Bd5! [2.Ke5? c1Q 3.c8Q Qb2+ 4.Kf5 f1Q+–+; 2.Kf5? f1Q+–+; 2.Kf6? f1Q+–+] 2...Bxd5+! [2...d1Q 3.e8Q Qg4+ 4.Ke5 Qg7+ 5.Ke6 Qg4+=; 2...f1Q? 3.e8Q Qh3+ 4.Ke5 Qh2+ 5.Kd4 d1Q+ 6.Kc5 Qd4+ 7.Kxd4 Qd2+ 8.Ke5 Qh2+ 9.Kf6 Qf4+ 10.Kg7 Qg4+ 11.Kf8 Qf4+ 12.Qf7 Qxd6+ 13.Qe7 Qh6+ 14.Qg7 Qd6+ 15.Ke8 Qxc7 16.Qd4++-; 2...c1Q? 3.e8Q d1Q (3...f1Q 4.Qb8++-) 4.Qb8++-] 3.exd5 [3.Kxd5? d1Q+–+] 3...e2! [3...c1Q? 4.d8Q d1Q 5.Qb8+ Ka6 6.c8Q++-; 3...d1Q 4.e8Q Qg4+ 5.Ke5!=; 3...f1Q 4.e8Q Qh3+ 5.Ke7=] 4.d8Q! [4.c8Q?/e8Q? e1Q+–+] 4...e1Q+ [4...c1Q? 5.Qb8+ Ka6 6.c8Q++-; 4...d1Q?/f1Q? 5.c8N+ Ka8 6.Qa5++-] 5.Kd7 [5.Kf7? f1Q+–+] 5...c1Q! [5...d1Q? 6.Qb8+ Ka6 7.c8Q++-; 5...f1Q? 6.c8N+ Ka8 7.Qa5++-] 6.Qb8+! [6.c8Q? Qxc8+ 7.Qxc8 f1Q 8.e8Q Qb5+–+; 6.e8Q? Qxe8+ with  7.Kxe8 f1Q 8.Qb8+ (8.c8Q Qxc8 9.Qxc8 d1Q–+) 8...Ka6 9.c8Q+ Qxc8+ 10.Qxc8+ Kb5 11.Qb7+ Kc5 12.Qc6+ Kb4 13.Qb7+ Qb5+–+  and  7.Qxe8 f1Q 8.Qb8+ (8.c8Q Qf5+–+) 8...Ka6 9.c8Q+ Qxc8+ 10.Qxc8+ Kb5 11.Qb7+ Ka5 12.Qa7+ Qa6–+] 6...Ka6 7.c8Q+ [7.e8Q? Qxe8+ 8.Kxe8 (8.Qxe8 f1Q 9.c8Q+ Qxc8+ 10.Qxc8+ Kb5–+ see 6.e8Q?) 8...f1Q–+ see 6.e8Q?] 7...Qxc8+ [7...Ka5? 8.Qa7++-] 8.Qxc8+ [8.Kxc8? f1Q–+] 8...Kb5 9.Qc6+ [wastes time: 9.Qb7+? Kc4 10.Qc6+ Kb4 (10...Kd3 11.Qb5+ Kc3 12.Qc5+= see 11.Qc5+ in the main line; 10...Kd4 11.Qb6+ Kc4 12.Qc6+= see the position after 9.Qb7+? Kc4 10.Qc6+) 11.Qb6+= see 10.Qb6+ in the main line] 9...Kb4 10.Qb6+! [10.e8Q? Qxe8+ 11.Kxe8 f1Q 12.d7 Qe2+ 13.Kf7/Kf8 Qf2+ 14.Ke8 d1Q 15.d8Q Qh5+–+] 10...Kc3 11.Qc5+ [11.e8Q? Qxe8+ 12.Kxe8 f1Q 13.d7 Qe2+ 14.Kf7 Qh5+ 15.Ke7 Qh4+ 16.Ke8 d1Q 17.d8Q Qdh5+–+] 11...Kb2 12.Qd4+ [12.e8Q? Qxe8+ 13.Kxe8 f1Q 14.d7 Qe2+ 15.Kf7 Qh5+ 16.Ke7 Qe5+ 17.Kf8 d1Q 18.d8Q Qf3+–+] 12...Kc2 13.Qc4+ [13.e8Q? Qxe8+ 14.Kxe8 f1Q 15.d7 Qe2+ 16.Kf7 d1Q 17.Qxd1+ Kxd1 18.d8Q Qh5+ 19.Ke6 (19.Ke7 Qg5+ 20.Ke8 Qxd8+ 21.Kxd8 b2–+) 19...b2–+] 13...Kb2 14.Qd4+ [14.e8Q? Qxe8+ 15.Kxe8 d1Q 16.d7 Qe1+ 17.Kf7 f1Q+ 18.Qxf1 Qxf1+ 19.Ke8 Qb5 20.Ke7 Qxd5–+] 14...Kb1! [14...Kc1? 15.Qc3+ Kd1 16.Qxb3+ Kc1 17.e8Q Qxe8+ 18.Kxe8 f1Q 19.Qc3+ Kd1 20.Qa1+ Ke2 21.Qxf1+ Kxf1 22.d7+-] 15.Qd3+! [15.e8Q? d1Q 16.Qxd1+ Qxd1 17.Qg6+ (17.Qe4+ Ka2 18.Qa4+ Kb2–+) 17...Ka2 18.Qg2 Qg1 19.Qh3 f1Q–+] 15...Ka2! [15...Kb2 16.Qd4+= see 14.Qd4+ in the main line] 16.e8Q! [16.Qa6+? Kb2 17.e8Q d1Q 18.Qh8+ Qc3–+] 16...f1Q [16...d1Q 17.Qa8+ Kb2 18.Qh8+!= perpetual check] 17.Qa8+ [17.Qxf1? Qxf1 18.Qa8+ Kb1 19.Kc7/Ke7 d1Q–+] 17...Kb2 18.Qh8+! [18.Qd4+? Kc2 19.Qah8 (19.Qc5+ Kb1–+; 19.Qc6+/Qc8+ Kb1–+) 19...Qb5+ 20.Kc7 Qc1 21.d7 d1Q 22.d8Q Qxd4 23.Qxd4 Kb1+ 24.Kd6 Qh6+ 25.Q8f6 Qa6+ 26.Ke7 Qh7+ 27.Qg7 Qb7+ 28.Kf8 Qf5+ 29.Qdf6 Qfc8+–+] 18...Ka2/Ka3 19.Qa8+!=.

Perpetual check (positional draw).

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Themes:  Refusal to capture undefended pieces.  Various tries.  Multiple promotions to Queen.  Strong counter play by Black.  Play covers all the chess-board.  Perpetual check (positional draw).

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