An idea for a different type of tournament

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jp
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Joined: Mon Apr 23, 2018 7:54 am

Re: An idea for a different type of tournament

Post by jp »

fastgm wrote: ↑Mon Jan 25, 2021 4:58 pm I was interested in the following position. The initial position with five pieces less for black. How many moves does white need to checkmate?

[d]2b1kb2/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1
To solve the position, I used Stockfish 11. In my experience, the most exact engine when it comes to mate problems.
After 60 hours on a 10-core with 32 GB hash, Stockfish found a checkmate in 22 moves.

Stockfish 11 64 POPCNT:
96/44 60:29:31 4.669.383.221.790 21.441.650 +M22 1.e4 g6 2.Nc3 c6 3.Qe2 h5 4.Qe3 b6 5.Qd4 f6 6.Qa4 a6 7.Qd4 b5 8.Qb6 d6 9.Qxc6+ Bd7 10.Qxa6 Kf7 11.Nd5 Be6 12.Nc7 Bd7 13.Bxb5 Bg4 14.Qa8 h4 15.h3 Bc8 16.Qxc8 f5 17.Qe8+ Kg7 18.Ne6+ Kf6 19.Nxf8 fxe4 20.Qxg6+ Ke5 21.Qg5+ Kd4 22.c3+

and all black moves after 1.e4:
62/31 2:21:16 158.317.142.203 18.676.162 -M15 1. ... f5 2.Qh5+ g6 3.Qxh7 d6 4.Qxg6+ Kd8 5.d4 f4 6.Bxf4 a6 7.Bg5 Bf5 8.Qf7 Bxe4 9.Qxf8+ Kd7 10.Qxe7+ Kc6 11.Qxe4+ Kb6 12.Bd8 a5 13.Qe8 a4 14.Qb5+ Ka7 15.Bxc7 Ka8 16.Qxa4+
62/33 2:21:16 158.317.142.203 18.676.162 -M16 1. ... f6 2.Qh5+ g6 3.Qxh7 d6 4.Qxg6+ Kd7 5.Nc3 c6 6.Nf3 a6 7.Nd4 Bh6 8.Qxh6 f5 9.Qg7 fxe4 10.Nf5 Kc7 11.Qxe7+ Bd7 12.Qxd6+ Kb6 13.Qb8 Bxf5 14.Na4+ Ka5 15.Qd8+ Kxa4 16.b3+ Kb4 17.Qb6+
62/33 2:21:16 158.317.142.203 18.676.162 -M16 1. ... h5 2.Qxh5 g6 3.Qh7 d5 4.exd5 Bg4 5.Bb5+ c6 6.dxc6 bxc6 7.Bxc6+ Kd8 8.Qxf7 Kc7 9.Qxf8 Kxc6 10.Qxe7 Bd7 11.Nf3 Bc8 12.Ne5+ Kb6 13.Nc3 Bd7 14.Qxd7 a6 15.Nc4+ Kc5 16.d4+ Kxc4 17.Qa4+
62/39 2:21:16 158.317.142.203 18.676.162 -M16 1. ... Kd8 2.Qh5 Ke8 3.Qxh7 d6 4.Nf3 Bg4 5.Ng5 Kd7 6.Qg8 Bh5 7.Qxf8 a6 8.Nxf7 Bxf7 9.Qxf7 Kd8 10.d4 Kd7 11.Nc3 c6 12.Bg5 Kc7 13.Qxe7+ Kb6 14.Qxd6 a5 15.Qb8 c5 16.Bd8+ Kc6 17.Qc7+
62/35 2:21:16 158.317.142.203 18.676.162 -M17 1. ... a5 2.Qh5 a4 3.Qxh7 a3 4.Nxa3 d5 5.exd5 Bg4 6.Bb5+ c6 7.dxc6 bxc6 8.Bxc6+ Bd7 9.Qf5 e6 10.Bxd7+ Ke7 11.Qc5+ Kxd7 12.Qxf8 f6 13.Qxg7+ Kd6 14.Nb5+ Kc6 15.Qc7+ Kxb5 16.Qd6 Ka4 17.Qc5 e5 18.b3+
62/37 2:21:16 158.317.142.203 18.676.162 -M18 1. ... c5 2.Qh5 c4 3.Qc5 Kd8 4.Qa5+ b6 5.Qxa7 e6 6.Qxb6+ Ke8 7.Bxc4 g5 8.Nc3 Be7 9.Qb8 Kd8 10.Na4 h6 11.Nb6 Bc5 12.Qxc8+ Ke7 13.Qxc5+ d6 14.Nc8+ Kf6 15.Nxd6 g4 16.Qc7 h5 17.Qxf7+ Ke5 18.Qxe6+ Kd4 19.Qd5+
62/37 2:21:16 158.317.142.203 18.676.162 -M18 1. ... b5 2.Qh5 c6 3.Qxh7 g5 4.Nf3 f6 5.Qg6+ Kd8 6.Qg8 Ke8 7.e5 a5 8.Bd3 f5 9.Nxg5 f4 10.Qf7+ Kd8 11.Qxf8+ Kc7 12.Qxe7 Kb7 13.Qd8 f3 14.Nf7 fxg2 15.Nd6+ Ka6 16.Rg1 a4 17.Qc7 Bb7 18.b4 axb3 19.axb3+
62/39 2:21:16 158.317.142.203 18.676.162 -M19 1. ... e5 2.Qh5 c6 3.Nf3 d6 4.Qxh7 Be7 5.Qg8+ Kd7 6.Qxg7 Kd8 7.Qg8+ Kd7 8.Qxf7 Kd8 9.Nc3 Bg4 10.Qg8+ Kc7 11.Qxg4 Bf6 12.Qg8 Bd8 13.Ng5 Bxg5 14.Qxg5 Kd7 15.Qg7+ Kc8 16.Ba6 bxa6 17.0-0 a5 18.f4 exf4 19.Rxf4 c5 20.Rf8+
62/39 2:21:16 158.317.142.203 18.676.162 -M19 1. ... c6 2.Qh5 d6 3.Qxh7 e5 4.Nf3 Be7 5.Qg8+ Kd7 6.Qxg7 Kd8 7.Qg8+ Kd7 8.Qxf7 Kd8 9.Nc3 Bg4 10.Qg8+ Kc7 11.Qxg4 Bf6 12.Qg8 Bd8 13.Ng5 Bxg5 14.Qxg5 Kd7 15.Qg7+ Kc8 16.Ba6 bxa6 17.0-0 a5 18.f4 exf4 19.Rxf4 c5 20.Rf8+
62/39 2:21:16 158.317.142.203 18.676.162 -M19 1. ... g5 2.Qh5 Bg7 3.Qxg5 Kf8 4.Qc5 c6 5.Qxa7 Ke8 6.Qa8 Kd8 7.Qa5+ b6 8.Qxb6+ Ke8 9.Qc7 e6 10.Qxc8+ Ke7 11.Nc3 f5 12.Nf3 Bf6 13.e5 Bg7 14.Na4 Bh6 15.Nc5 Kf7 16.Qxd7+ Kg8 17.Qe8+ Bf8 18.Nxe6 h5 19.Qxf8+ Kh7 20.Qg7+
62/39 2:21:16 158.317.142.203 18.676.162 -M19 1. ... b6 2.Qh5 h6 3.Qe5 d6 4.Qd5 a6 5.Qc6+ Kd8 6.Nc3 e6 7.Nb5 Bd7 8.Qxc7+ Ke8 9.Qb8+ Ke7 10.Qxd6+ Ke8 11.Nc7+ Kd8 12.Nxe6+ fxe6 13.Qxf8+ Kc7 14.b4 Bc6 15.Bb2 b5 16.Be5+ Kd7 17.Bd6 Bxe4 18.Qe7+ Kc6 19.Qc7+ Kd5 20.Qc5+
62/41 2:21:16 158.317.142.203 18.676.162 -M20 1. ... d6 2.Qh5 Bd7 3.Qxh7 Be6 4.Nf3 f6 5.Qh5+ g6 6.Qxg6+ Bf7 7.Qf5 e6 8.Qb5+ Ke7 9.Qxb7 Bh6 10.Qxc7+ Kf8 11.Qxd6+ Kg8 12.Nd4 Bf8 13.Qd7 f5 14.Nxe6 Bh6 15.Nd8 Bg6 16.Bc4+ Kh8 17.Nf7+ Kh7 18.Nxh6+ Kxh6 19.d4+ Kh5 20.Be2+ Kh4 21.Qd8+
62/43 2:21:16 158.317.142.203 18.676.162 -M21 1. ... e6 2.Qh5 h6 3.Qa5 Kd8 4.Qxa7 Bd6 5.Nc3 c6 6.Qd4 Kc7 7.Qxg7 f6 8.Qxf6 Bb4 9.Nf3 Bc5 10.Qxh6 Be7 11.Qg7 Kd8 12.Qh8+ Kc7 13.Nb5+ cxb5 14.Nd4 d6 15.Qe8 Bf6 16.Nxb5+ Kb8 17.Qf8 Be5 18.Qd8 d5 19.d4 Bd6 20.Qxd6+ Ka8 21.Qa3+ Kb8 22.Qa7+
62/43 2:21:16 158.317.142.203 18.676.162 -M21 1. ... d5 2.exd5 a6 3.Qf3 b5 4.Qf4 e5 5.Qxe5+ Kd8 6.Qh5 Ke8 7.Nf3 h6 8.Ne5 g6 9.Qe2 Bd6 10.Nxg6+ Kd7 11.Ne5+ Ke7 12.Qh5 Kd8 13.Nxf7+ Ke7 14.Ne5 Bxe5 15.Qxe5+ Kd8 16.Qf6+ Ke8 17.Bd3 Bg4 18.0-0 Kd7 19.Re1 Kc8 20.Re8+ Kb7 21.Qc6+ Ka7 22.Qxc7+
62/43 2:21:16 158.317.142.203 18.676.162 -M21 1. ... h6 2.Qh5 e6 3.Qa5 Kd8 4.Qxa7 Bd6 5.Nc3 c6 6.Qd4 Kc7 7.Qxg7 f6 8.Qxf6 Bb4 9.Nf3 Bc5 10.Qxh6 Be7 11.Qg7 Kd8 12.Qh8+ Kc7 13.Nb5+ cxb5 14.Nd4 d6 15.Qe8 Bf6 16.Nxb5+ Kb8 17.Qf8 Be5 18.Qd8 d5 19.d4 Bd6 20.Qxd6+ Ka8 21.Qa3+ Kb8 22.Qa7+
62/43 2:21:16 158.317.142.203 18.676.162 -M21 1. ... g6 2.Nc3 c6 3.Qe2 h5 4.Qe3 b6 5.Qd4 f6 6.Qa4 a6 7.Qd4 Bh6 8.Qxb6 Bf4 9.Nf3 a5 10.Qxa5 Bb7 11.Qa7 Bc7 12.Qxb7 Bd8 13.Nb5 h4 14.Qc8 Kf7 15.Qxd8 cxb5 16.Bxb5 g5 17.Qxd7 h3 18.Qe8+ Kg7 19.Qxe7+ Kg6 20.Be8+ Kh6 21.Qf7 hxg2 22.Qg6+
62/43 2:21:16 158.317.142.203 18.676.162 -M21 1. ... a6 2.Qh5 h6 3.Qc5 Kd8 4.Bc4 f6 5.Qh5 e6 6.Qf7 Bb4 7.Qg8+ Ke7 8.Qxg7+ Ke8 9.Qg8+ Bf8 10.Be2 d6 11.Bh5+ Kd7 12.Qxf8 c6 13.Qxf6 a5 14.d3 Kc7 15.Qe7+ Bd7 16.Be8 Kb6 17.Qxd7 d5 18.Be3+ Ka6 19.Qc7 d4 20.Bxd4 c5 21.Bxc5 b6 22.Qxb6+

Even after hours of forward- and backward analysis, I haven't been able to find a faster mate.
Is there a faster mate? Especially after the probably strongest continuation 1.e4 g6?
Maybe with the maneuver h4 and Rh3 or a4 and Ra3?
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