Astounding draw!

[David Dahlem]

[d]Q1Q2nk1/4bp2/3r2p1/7p/7P/2p5/8/5K2 b - - 0 45

Kosten - Zelcic Bozen 1992

The c3-pawn will fall, after which the unusual constellation of two Queens versus Rook, Knight and Bishop arises. Despite this huge advantage, it turns out White cannot take Black's fortress, which he needed 35 moves to recognize:
45...Re6 46.Qxc3 Bf6 47.Qcc8 Bg7 48.Qab7 Re5 49.Kf2 Re6 50.Qcc7 Rf6+ 51.Ke3 Rf5 52.Qbc8 Rf1 53.Ke2 Rf6 54.Qc4 Re6+ 55.Kd3 Rf6 56.Kc2 Rf2+ 57.Kb3 Rf6 58.Ka4 Rf2 59.Kb5 Rf6 60.Qd8 Rf3 61.Kb6 Rf6+ 62.Kc7 Rf3 63.Qd2 Rf5 64.Kc8 Rf6 65.Qd8 Rf5 66.Qe7 Rf6 67.Qcc5 Re6 68.Qd8 Bh6 69.Qf2 Bg7 70.Qg5 Re8+ 71.Kb7 Ne6 72.Qd5 Re7+ 73.Kc6 Nf8 74.Qd8 Re6+ 75.Kb5 Bh6 76.Qa8 Bg7 77.Qf4 Re7 78.Kc6 Re6+ 79.Kd5 Re7 80.Qf3 Be5 81.Qf1 and a draw was agreed.

[d]Q4nk1/4rp2/6p1/3Kb2p/7P/8/8/5Q2 b - - 0 81

Any engine show a score close to a draw, even in the final position?

[zamar]

Nice example of how two queens do not work well together! This is a well known fact for top players.

[David Dahlem]

Nice example of how two queens do not work well together! This is a well known fact for top players.

[d]6Q1/1q6/6p1/p2R1p1p/6kP/6P1/4P1K1/q7 b - - 0 1

Another example, the two queens can't prevent being mated:
Thornton - Horrocks 1984

Spark 0.3a:

20/41 00:57 72.893.662 1.268.399 -M16 Qa1f6 Kg2h2 Qb7b6 Rd5xf5 Kg4xf5 Qg8d5+ Qf6e5 Qd5f3+ Kf5e6 Qf3g2 Qb6b2 Qg2c6+ Ke6e7 Kh2h1 Qb2b1+ Kh1h2 Qe5xe2+ Qc6g2 Qb1a2 Qg2xe2+ Qa2xe2+ Kh2g1 Ke7e6 g3g4 h5xg4 h4h5 g4g3 h5xg6 Qe2f2+ Kg1h1 Qf2h2+
21/41 01:13 100.411.489 1.362.657 -M15 Qa1f6 Kg2h2 Qb7b6 Rd5xf5 Kg4xf5 Qg8d5+ Qf6e5 Qd5f3+ Kf5e6 Qf3g2 Qb6b2 Qg2c6+ Ke6e7 Kh2h1 Qe5xg3 Qc6c5+ Ke7f7 Qc5a7+ Kf7f6 Qa7a6+ Kf6g7 Qa6a7+ Kg7h6 Qa7e3+ Qg3xe3 Kh1g2 Qb2xe2+ Kg2h1 Qe3c1+
22/41 01:33 138.186.985 1.476.451 -M15 Qa1f6 Kg2h2 Qb7b6 Rd5xf5 Kg4xf5 Qg8d5+ Qf6e5 Qd5f3+ Kf5e6 Qf3g2 Qb6b2 Qg2c6+ Ke6e7 Kh2h1 Qe5xg3 Qc6c5+ Ke7f7 Qc5a7+ Kf7f6 Qa7a6+ Kf6g7 Qa6a7+ Kg7h6 Qa7e3+ Qg3xe3 Kh1g2 Qb2xe2+ Kg2h1 Qe3c1+
23/41 02:19 224.951.165 1.617.620 -M15 Qa1f6 Kg2h2 Qb7b6 Rd5xf5 Kg4xf5 Qg8d5+ Qf6e5 Qd5f3+ Kf5e6 Qf3g2 Qb6b2 Qg2c6+ Ke6e7 Kh2h1 Qe5xg3 Qc6c5+ Ke7f7 Qc5a7+ Kf7f6 Qa7a6+ Kf6g7 Qa6a7+ Kg7h6 Qa7e3+ Qg3xe3 Kh1g2 Qb2xe2+ Kg2h1 Qe3c1+
24/41 03:41 380.274.969 1.717.538 -M15 Qa1f6 Kg2h2 Qb7b6 Rd5xf5 Kg4xf5 Qg8d5+ Qf6e5 Qd5f3+ Kf5e6 Qf3g2 Qb6b2 Qg2c6+ Ke6e7 Kh2h1 Qe5xg3 Qc6c5+ Ke7f7 Qc5a7+ Kf7f6 Qa7a6+ Kf6g7 Qa6a7+ Kg7h6 Qa7e3+ Qg3xe3 Kh1g2 Qb2xe2+ Kg2h1 Qe3c1+
25/41 07:27 780.874.321 1.745.395 -M15 Qa1f6 Kg2h2 Qb7b6 Rd5xf5 Kg4xf5 Qg8d5+ Qf6e5 Qd5f3+ Kf5e6 Qf3g2 Qb6b2 Qg2c6+ Ke6e7 Kh2h1 Qe5xg3 Qc6c5+ Ke7f7 Qc5a7+ Kf7f6 Qa7a6+ Kf6g7 Qa6a7+ Kg7h6 Qa7e3+ Qg3xe3 Kh1g2 Qb2xe2+ Kg2h1 Qe3c1+

[Vinvin]

Nice example of how two queens do not work well together! This is a well known fact for top players.

[d]6Q1/1q6/6p1/p2R1p1p/6kP/6P1/4P1K1/q7 b - - 0 1

Another example, the two queens can't prevent being mated:

The black wins easily in this position ...

[Andre]

Look at this one

[d]Q7/2q5/1p6/1kp5/8/2P3p1/PP1KP3/7q w - - 0 8

8.a4+ Kc4 9.Qg8+!! Qd5+ 10.Kc2 Qxg8 11.e4 and 12.b3 mate

This is the end of a very famous study

[zullil]

Look at this one

[d]Q7/2q5/1p6/1kp5/8/2P3p1/PP1KP3/7q w - - 0 8

8.a4+ Kc4 9.Qg8+!! Qd5+ 10.Kc2 Qxg8 11.e4 and 12.b3 mate

This is the end of a very famous study

What's the winning line for White if Black plays 9.Qf7 instead of 9.Qd5+ ?

[zullil]

Look at this one

[d]Q7/2q5/1p6/1kp5/8/2P3p1/PP1KP3/7q w - - 0 8

8.a4+ Kc4 9.Qg8+!! Qd5+ 10.Kc2 Qxg8 11.e4 and 12.b3 mate

This is the end of a very famous study

What's the winning line for White if Black plays 9.Qf7 instead of 9.Qd5+ ?

Nevermind.