Very Deep Mate

[Terry McCracken]

Start Your Engines!

[d]r2q1rnk/1p1bb1pp/p2p4/3NppP1/P2BPP2/3Q3R/1PP1B2P/6RK w - - 0 1

Have Fun....

[Eelco de Groot]

Hello Terry,

Toga Blueberry does not yet find a matescore, but thinks that fxe5 is a very good move:


[D]r2q1rnk/1p1bb1pp/p2p4/3NppP1/P2BPP2/3Q3R/1PP1B2P/6RK w - -

Engine: Toga II MP Blueberry Winfinder Beta (256 MB, Athlon 2009 MHz single core)
by Fabien Letouzey, Thomas Gaksch and Zach Wegner

1/07 0:00 +1.13 1.Nxe7 Nxe7 (37)

1/17 0:00 +1.18 1.Bb6 fxe4 2.Qxe4 (1.704)

1/17 0:00 +1.74 1.g6 Bh4 (2.314)

2/18 0:00 +1.37 1.g6 Bh4 2.Bf2 (3.492)

3/20 0:00 +1.94++ 1.g6 h6 2.Bb6 fxe4 3.Qxe4 Bf5 (10.000)

4/22 0:00 +1.38 1.g6 h6 2.Bb6 fxe4 3.Qxe4 Bf5 4.Qb4 (14.309)

5/25 0:00 +1.64 1.g6 h6 2.Bb6 fxe4 3.Qxe4 Bf5 4.Qb4 Qd7 (37.085)

6/26 0:00 +1.07 1.g6 h6 2.Bb6 fxe4 3.Qb3 Qe8 4.Nc7 Bxa4 (108.573)

6/28 0:00 +2.04++ 1.fxe5 fxe4 2.Rxh7+ Kxh7 3.Qxe4+ Bf5
4.Qh4+ Nh6 5.Nxe7 Qb6 (228.413)

7/38 0:02 +4.60++ 1.fxe5 fxe4 2.Rxh7+ Kxh7 3.Qxe4+ Bf5
4.Qh4+ Nh6 5.Nxe7 dxe5 6.Bxe5 Rf7
7.Bxg7 Rxe7 8.Qxh6+ Kg8 9.Bc4+ Re6
10.Bxe6+ Bxe6 11.Qh8+ Kf7 (1.522.196) 710

8/52 0:06 +5.15++ 1.fxe5 Bxg5 2.e6 Bxe6 3.Bxg7+ Kxg7
4.Qc3+ Rf6 5.Rxg5+ Kf8 6.Rxg8+ Bxg8
7.Nxf6 Rc8 8.Rg3 Rxc3 9.Rxg8+ Kf7
10.Rxd8 Rxc2 (4.714.514) 726

9/52 0:19 +5.93++ 1.fxe5 Bxg5 2.e6 Bf6 3.e7 Qxe7
4.Nxe7 Nxe7 5.Rh5 Bc6 6.Bxf6 Rxf6
7.Bf3 f4 8.Rhg5 Rg8 9.Qd4 (14.102.373) 727

10/52 0:26 +5.85 1.fxe5 Bxg5 2.e6 Bf6 3.e7 Qxe7
4.Bxf6 Rxf6 5.Nxe7 Nxe7 6.Rh5 Bxa4
7.Qg3 Rf7 8.Qh3 h6 (19.736.462) 733

11/58 1:40 +7.10++ 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 fxe4
10.Qxe4 Nh6 11.Ne7 Rf6 12.Qxb7 (74.905.451) 742

12/62 2:40 +6.81 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh4+ Kg7
13.exf5 Rxd7 (119.726.067) 747

13/110 9:41 +8.10++ 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 fxe4
10.Nc7 Rf6 11.Qe8 Rxe8 12.dxe8Q Rf2
13.Qxe4 (432.053.712) 742

Eelco

[Eelco de Groot]

Hiarcs 11.2 has about the same analysis result and quickly plays 1. fxe5, within 7 plies, and does not change its move in twenty minutes:


[D]r2q1rnk/1p1bb1pp/p2p4/3NppP1/P2BPP2/3Q3R/1PP1B2P/6RK w - -

Engine: HIARCS 11.2 SP Default (256 MB)
by Mark John Uniacke

7/28 0:00 +1.26 1.fxe5 fxe4 2.Rxh7+ Kxh7 3.Qxe4+ Bf5
4.Qh4+ Nh6 5.Nxe7 dxe5 6.gxh6 Qxd4 (141.512) 266

8/28 0:00 +1.51++ 1.fxe5 (222.241) 268

8/29 0:02 +4.03 1.fxe5 dxe5 2.Bxe5 Re8 3.Bxg7+ (626.865) 263

9/31 0:03 +4.28 1.fxe5 fxe4 2.Rxh7+ Kxh7 3.Qxe4+ (842.516) 260

10/32 0:04 +4.53++ 1.fxe5 (1.246.452) 263

10/33 0:05 +5.14 1.fxe5 Bxg5 2.e6 Bxe6 3.Bxg7+ Kxg7
4.Qc3+ (1.440.426) 262

11/33 0:08 +5.37 1.fxe5 fxe4 2.e6 exd3 3.Bxd3 (2.153.757) 260

12/33 0:14 +5.62++ 1.fxe5 (3.821.066) 257

12/39 0:41 +6.25 1.fxe5 Bxg5 2.e6 Bf6 3.e7 Qe8 4.Rxg7 Kxg7
5.Rg3+ Qg6 6.Rxg6+ hxg6 7.exf8Q+ Rxf8
8.Nxf6 Nxf6 9.exf5 Bxf5 10.Qc3 Be4+
11.Kg1 (11.543.612) 276

13/39 1:03 +6.50++ 1.fxe5 (16.876.203) 265

13/39 1:43 +7.76 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.Qh5+ Kg7
10.Qxg5+ Kh7 11.Qh4+ Nh6 12.exd7 (26.718.619) 257

14/39 2:54 +8.01++ 1.fxe5 (44.027.048) 252

14/39 3:09 +8.01 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh4+ Kg7
13.exf5 (48.852.642) 257

15/39 5:00 +8.26++ 1.fxe5 (74.303.891) 247

15/40 6:40 +8.68 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh5+ Kg7
13.exf5 (99.330.677) 247

16/41 11:28 +8.93++ 1.fxe5 (165.597.294) 240

16/43 16:24 +9.31 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh4+ Kg7
13.exf5 Rxd7 14.f6+ (241.243.425) 244

best move: f4xe5 time: 20:12.422 min n/s: 255.920 nodes: 310.239.470

[Terry McCracken]

Hiarcs 11.2 has about the same analysis result and quickly plays 1. fxe5, within 7 plies, and does not change its move in twenty minutes:


[D]r2q1rnk/1p1bb1pp/p2p4/3NppP1/P2BPP2/3Q3R/1PP1B2P/6RK w - -

Engine: HIARCS 11.2 SP Default (256 MB)
by Mark John Uniacke

7/28 0:00 +1.26 1.fxe5 fxe4 2.Rxh7+ Kxh7 3.Qxe4+ Bf5
4.Qh4+ Nh6 5.Nxe7 dxe5 6.gxh6 Qxd4 (141.512) 266

8/28 0:00 +1.51++ 1.fxe5 (222.241) 268

8/29 0:02 +4.03 1.fxe5 dxe5 2.Bxe5 Re8 3.Bxg7+ (626.865) 263

9/31 0:03 +4.28 1.fxe5 fxe4 2.Rxh7+ Kxh7 3.Qxe4+ (842.516) 260

10/32 0:04 +4.53++ 1.fxe5 (1.246.452) 263

10/33 0:05 +5.14 1.fxe5 Bxg5 2.e6 Bxe6 3.Bxg7+ Kxg7
4.Qc3+ (1.440.426) 262

11/33 0:08 +5.37 1.fxe5 fxe4 2.e6 exd3 3.Bxd3 (2.153.757) 260

12/33 0:14 +5.62++ 1.fxe5 (3.821.066) 257

12/39 0:41 +6.25 1.fxe5 Bxg5 2.e6 Bf6 3.e7 Qe8 4.Rxg7 Kxg7
5.Rg3+ Qg6 6.Rxg6+ hxg6 7.exf8Q+ Rxf8
8.Nxf6 Nxf6 9.exf5 Bxf5 10.Qc3 Be4+
11.Kg1 (11.543.612) 276

13/39 1:03 +6.50++ 1.fxe5 (16.876.203) 265

13/39 1:43 +7.76 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.Qh5+ Kg7
10.Qxg5+ Kh7 11.Qh4+ Nh6 12.exd7 (26.718.619) 257

14/39 2:54 +8.01++ 1.fxe5 (44.027.048) 252

14/39 3:09 +8.01 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh4+ Kg7
13.exf5 (48.852.642) 257

15/39 5:00 +8.26++ 1.fxe5 (74.303.891) 247

15/40 6:40 +8.68 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh5+ Kg7
13.exf5 (99.330.677) 247

16/41 11:28 +8.93++ 1.fxe5 (165.597.294) 240

16/43 16:24 +9.31 1.fxe5 Bxg5 2.e6 Bf6 3.Rxg7 Bxg7
4.Bxg7+ Kxg7 5.Qg3+ Kh8 6.Qg6 h6
7.Rg3 Qg5 8.Rxg5 hxg5 9.exd7 Rad8
10.Qh5+ Kg7 11.Qxg5+ Kh8 12.Qh4+ Kg7
13.exf5 Rxd7 14.f6+ (241.243.425) 244

best move: f4xe5 time: 20:12.422 min n/s: 255.920 nodes: 310.239.470

Yes, 1. fe is the right move, but the mate is so far away, I doubt any engine in the world on any hardware could see the forced mate.

This would include Deep Blue, when it was active and Hydra today as well.

Best Terry