Interesting mate in 8

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Dann Corbit
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Interesting mate in 8

Post by Dann Corbit » Wed Jan 13, 2021 8:26 pm


Rf3 is mate in 8.
There are a couple other mating moves.
And engines like Bg2 which probably wins.
But the thing that is interesting to me is that I think most humans would play the obvious looking Rf3.
Stockfish took a long time to find it on my machine.
Winning plan: Rf3 Qc7 Rh7 Qf7 Rh8+ Kxh8 gxf7 g5 Rxf6 Kg7 f8=R Rxf8 Qxg5+ Kh8 Rh6#
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

Jim Logan
Posts: 56
Joined: Thu Mar 09, 2006 3:14 am
Location: Nevada, USA

Re: Interesting mate in 8

Post by Jim Logan » Wed Jan 13, 2021 10:30 pm

Stockfish 1/11 development version took a long time. So did Fritz 17. Houdini 6.03 pext solved it it a flash though.

Terje
Posts: 292
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Full name: Terje Kirstihagen

Re: Interesting mate in 8

Post by Terje » Thu Jan 14, 2021 4:34 am

Weiss liked Kg2 solving it to a mate in 9 before switching to Rf3 mate in 8. Took 4 minutes or so :oops:

An old Crystal did the same in 10 seconds..

Jim Logan
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Location: Nevada, USA

Re: Interesting mate in 8

Post by Jim Logan » Thu Jan 14, 2021 5:13 am

It appears old engines have an easier time with this - Deep Junior Yokohama, Deep Rybka 4.1 SSE2 x64, and Zappa Mexico II x64 solve this instantly. At least on my 6-core i5.

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JVMerlino
Posts: 1046
Joined: Wed Mar 08, 2006 9:15 pm
Location: San Francisco, California

Re: Interesting mate in 8

Post by JVMerlino » Thu Jan 14, 2021 6:04 am

Myrddin took 90 seconds to give a Mate in 9 with Kg2. But, no surprise, the great old mate-finder The King from CM9000 finds Re3 and announces Mate in 8 in eight seconds.

Code: Select all

Time	Depth	Score	Positions	Moves
0:00	1/3	4.17	2247		1.Qh3 Kf8 2.Qh8+ Ke7 3.Qxg7+ Kd6
					4.Qxb7 Bxb7
0:00	1/4	4.57	7786		1.Qh3 Kf8 2.Qh8+ Ke7 3.Qxg7+ Kd6
					4.Qxb7 Bxb7 5.Rh7 Rab8
0:00	1/5	4.77	28655		1.Qh3 Kf8 2.Qh8+ Ke7 3.Qxg7+ Kd6
					4.Qxb7 Bxb7 5.Bg2 Ke5 6.Rh7
0:00	1/6	4.71	78661		1.Qh3 Kf8 2.Qh8+ Ke7 3.Qxg7+ Kd6
					4.Qxb7 Bxb7 5.Bg2 Ke5 6.Rh7 Rab8
0:00	1/6	4.74	205349		1.Kg2 Qc7 2.Qh3 Kf8 3.Qh8+ Ke7
					4.Qxg7+ Kd8 5.Qxc7+ Kxc7 6.Rh7+
					Kd6 7.Bd3 Rab8
0:00	1/7	6.66	343940		1.Kg2 Qc7 2.Rfh1 Qxh2+ 3.Rxh2 dxe4
					4.Qh3 e3+ 5.Kg1 Kf8 6.Qh8+ Ke7
					7.Qxg7+ Kd6 8.Qxf6 Rab8
0:00	1/7	7.42	550133		1.Rf4 Qc7 2.Qg3 Qxf4 3.Qxf4 dxe4
					4.Qc7 e3+ 5.Qxc6 Rab8
0:00	1/8	8.16	979727		1.Rf4 Qc7 2.Qg3 Qxf4 3.Qxf4 Rac8
					4.Qh4 Kf8 5.Qh8+ Ke7 6.Qxg7+ Kd6
					7.Bd3
0:01	1/8	Mate11	1519603		1.Kg2 Qc7 2.Rh7 d4 3.Rfh1 Bxe4+
					4.Qxe4 Kf8 5.Nd5 Qf7 6.Rh8+ Qg8
					7.Rxg8+ Kxg8 8.Rh8+ Kxh8 9.Qh4+
					Kg8 10.Qh7+ Kf8 11.Qh8#
0:01	1/9	Mate09	2114706		1.Kg2 Qc7 2.Rh7 d4 3.Rfh1 Bxe4+
					4.Qxe4 Kf8 5.Nd5 Qf7 6.Rh8+ Qg8
					7.Rxg8+ Kxg8 8.Qh4 exd5 9.Qh8#
0:02	1/10	Mate09	3523860		1.Kg2 Qc7 2.Rh7 d4 3.Rfh1 Bxe4+
					4.Qxe4 Kf8 5.Nd5 Qf7 6.Rh8+ Qg8
					7.Rxg8+ Kxg8 8.Qh4 exd5 9.Qh8#
0:05	2/11	Mate09	8649013		1.Kg2 Qc7 2.Rh7 d4 3.Rfh1 Bxe4+
					4.Qxe4 Kf8 5.Nd5 Qf7 6.Rh8+ Qg8
					7.Rxg8+ Kxg8 8.Qh4 exd5 9.Qh8#
0:08	2/11	Mate08	14950823	1.Rf3 Qc7 2.Rh7 Qd6 3.Rh8+ Kxh8
					4.Rxf6 Kg8 5.Qh3 Qh2+ 6.Qxh2 gxf6
					7.Qh7+ Kf8 8.Qf7#

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MikeB
Posts: 4549
Joined: Thu Mar 09, 2006 5:34 am
Location: Pen Argyl, Pennsylvania

Re: Interesting mate in 8

Post by MikeB » Thu Jan 14, 2021 6:34 am

BD is not as fast as Crystal

mover viewpoint fewer / Multi-PV setting = 1 / more
exclude: none best +tail
dep score nodes time (not shown: tbhits knps seldep)
23 10 seconds
23 #8 869.6M 0:08.83 Rf3 Qc7 Rh7 Qf7 Rh8+ Kxh8 gxf7 g5 Rxf6 Kg7 f8=R Rxf8 Qxg5+ Kh8 Rh6#
22 #8 195.7M 0:01.91 Rf3 Qc7 Rh7 Qf7 Rh8+ Kxh8 gxf7 g5 Rxf6 Kg7 f8=R Rxf8 Qxg5+ Kh8 Rh6#
21 #9 110.7M 0:01.07 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
20 #9 46.6M 0:00.46 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
19 #9 43.3M 0:00.42 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
18 #9 38.6M 0:00.37 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
17 #9 38.6M 0:00.37 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
16 #9 38.6M 0:00.37 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
15 #9 38.5M 0:00.37 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
14 +5.48 6.01M 0:00.06 Bg2 d4 Qh3 Bxg2+ Rxg2 Rab8 Ne2 Kf8 Nxd4 Ke7 Qxe6+ Kd8 Qd6+ Kc8 Rf3 Qxf3 Qc5+ Kb7 Nxf3 Rbd8 a5 Re6 Kh2
13 +5.35 5.65M 0:00.06 Bg2 d4 Qh3 Bxg2+ Rxg2 Rab8 Ne2 d3 cxd3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Rf8 Qd4+ Qd5 Rxf8 Rxf8
12 +5.16 5.49M 0:00.06 Bg2 d4 Qh3 Bxg2+ Rxg2 Rab8 Qh7+ Kf8 Ne2 d3 cxd3 Ke7 Qxg7+ Kd6 Qxf6 Rh8+ Kg1 Rhf8 Qd4+ Qd5 Qxd5+ exd5 g7
11 +5.06 2.57M 0:00.03 Bg2 d4 Qh3 Bxg2+ Rxg2 Rab8 Qh7+ Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Rxb7 Ne4+ Ke5 Nxf6 Rh8+ Kg1 Rg7 Rg4 d3 cxd3
10 +3.55 891741 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2 f5 g7 Rg8 Rh7 Bc6 a5 Rab8 b3
9 +3.86 545557 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2 Bc6 Rxf6
8 +3.81 341104 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bd3 Rh8 Rxf6
7 +3.85 255871 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2
6 +4.01 213819 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7
5 +4.07 189201 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7
4 +4.12 179202 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7
3 +4.14 155644 0:00.01 Qh3 Kf8 Qh8+ Ke7
2 +4.89 40855 0:00.01 Qh3 Kf8
1 NNUE evaluation using eval.bin enabled
1 Found 510 tablebases
1 +3.23 6982 0:00.00 Bg2
0 #

BD with Night Nurse with pretty fast
mover viewpoint fewer / Multi-PV setting = 1 / more
exclude: none best +tail
dep score nodes time (not shown: tbhits knps seldep)

21 #8 145.5M 0:01.38 Rf3 Qc7 Rh7 Qf7 Rh8+ Kxh8 gxf7 g5 Rxf6 Kg7 f8=R Rxf8 Qxg5+ Kh8 Rh6#
20 #9 95.3M 0:00.89 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
19 #9 84.6M 0:00.78 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
18 #9 76.1M 0:00.69 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Qxe4 Kf8 Nd5 Qf7 Rh8+ Qg8 Rxg8+ Kxg8 Qh4 exd5 Qh8#
17 #10 71.1M 0:00.64 Kg2 Qc7 Rh7 Qa7 Qh3 Kf8 Rxf6+ Ke7 Qxe6+ Kd8 Qxc6 Qd7 Rd6 Ra7 Nxd5 Rxe4 Rxd7+ Rxd7 Qa8#
16 +7.63 24.7M 0:00.24 Kg2 Qa7 Qf4 Qd7 Qh4 Kf8 Rxf6+ Ke7 Rf7+ Kd6 Qg3+ e5 Nxd5 Rac8 Qa3+ Ke6 Rxd7 Bxd7 Qh3+ Kd6 Qd3 Be6 Nf6+ Ke7 Nxe8 Rxe8 Qxa6 Rd8 Rh7 Rg8 Rh5 Rd8 Qa7+ Rd7 Qc5+ Rd6 Rxe5
15 +5.48 11.1M 0:00.12 Kg2 Qc7 Rfh1 Qxh2+ Kxh2 f5 Bg2 Rab8 b3 Rb4 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qf6 d4 Bxc6 Kxc6 g7 Rbb8
14 +4.02 6.81M 0:00.08 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Ra7 Rh7 Rb8 Rd1+ Ke5 Bf3 Rxh7+ gxh7 Kf6
13 +3.94 4.72M 0:00.05 Bg2 Rab8 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 b3 Qxf6 Rxf6 Ke7 Rf7+ Kd6 Rhh7 Rg8 g7
12 +4.06 3.86M 0:00.04 Bg2 Rab8 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 b3 Qxf6 Rxf6 Ke7 Rf7+ Kd6 g7 Rg8 Ne2 Rb7 Rxb7 Bxb7 Rh7 Ke7
11 +3.99 3.32M 0:00.04 Bg2 Kf8 Qc5+ Kg8 Qd4 Qxb2 Qh4 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Rab8 Rh5 Rb4 Nxd5 Qxf6 Nxf6 Rc8 Bxc6
10 +3.86 2.24M 0:00.03 Bg2 Kf8 Qc5+ Kg8 Qd4 Qxb2 Qh4 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Qb4 Rh7
9 +2.71 2.09M 0:00.02 Bg2 Rab8 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Rf8 Qd4
8 +4.00 343402 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Qb4 Qf4+ Kc5 Bg2
7 +4.30 289738 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Kc8 Rh7 Bd7
6 +4.16 256541 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Qb6 Qf4+ Kd7
5 +3.92 177407 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Kc8
4 +4.01 143205 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8
3 +4.20 123035 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Kc8
2 +4.39 103641 0:00.01 Qh3 Kf8
1 NNUE evaluation using ninu.bin enabled
1 +1.59 18880 0:00.01 Bf3 Qxb2
0 #

Bluefish with Night Nurse finds Kg2 mate-in-9
mover viewpoint fewer / Multi-PV setting = 1 / more
exclude: none best +tail
dep score nodes time (not shown: tbhits knps seldep)
45 #9 4.59G 0:35.10 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
44 #9 4.18G 0:32.06 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
43 30 seconds
43 #9 3.85G 0:29.60 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
42 #9 3.56G 0:27.46 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
41 #9 3.32G 0:25.67 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
40 #9 3.13G 0:24.20 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
39 #9 2.96G 0:22.90 Kg2 Qc7 Rh7 d4 Rfh1 Bxe4+ Nxe4 Qxc2+ Kg3 Qc7+ Kf3 Kf8 Qa3+ Qd6 Qxd6+ Re7 Rh8#
38 #9 2.81G 0:21.70 Kg2 Qc7 Rh7 Bb7 Rfh1 Kf8 Nxd5 Qxc2+ Kg3 Qc7+ Kf3 Qg3+ Kxg3 exd5 Qc5+ Re7 Rh8#
37 #9 2.67G 0:20.60 Kg2 Qc7 Rh7 Bb7 Rfh1 Kf8 Nxd5 Qxc2+ Kg3 Qc7+ Kf3 Qg3+ Kxg3 exd5 Qc5+ Re7 Rh8#
36 20 seconds
36 #9 2.57G 0:19.75 Kg2 Qc7 Rh7 Bb7 Rfh1 Kf8 Nxd5 Qxc2+ Kg3 Qc7+ Kf3 Qg3+ Kxg3 exd5 Qc5+ Re7 Rh8#
35 #10 2.48G 0:19.05 Kg2 Qc7 Rh7 Bb7 Qh3 Kf8 Rxf6+ Ke7 Rxe6+ Kd7 Rxg7+ Re7 Rf6+ Kd8 Rf8+ Re8 Rxe8+ Kxe8 Qh8#
34 #10 2.38G 0:18.20 Kg2 Qc7 Rh7 Bb7 Qh3 Kf8 Rxf6+ Ke7 Rxe6+ Kd7 Rxg7+ Re7 Rf6+ Kd8 Rf8+ Re8 Rxe8+ Kxe8 Qh8#
33 #10 2.33G 0:17.81 Kg2 Qc7 Rh7 Bb7 Qh3 Kf8 Rxf6+ Ke7 Rxe6+ Kd7 Rxg7+ Re7 Rf6+ Kd8 Rf8+ Re8 Rxe8+ Kxe8 Qh8#
32 #13 2.19G 0:16.58 Kg2 Qc7 Rfh1 Qxh2+ Rxh2 Rad8 Qc5 Bd7 Nxd5 exd5 Bxd5+ Be6 Bxe6+ Rxe6 Qc7 Re2+ Kf3 Re3+ Kxe3 Re8+ Kf2 Re7 Qb8+ Re8 Qxe8#
31 #13 2.12G 0:15.94 Kg2 Qc7 Rfh1 Qxh2+ Rxh2 Rad8 Qc5 Bd7 Nxd5 exd5 Bxd5+ Be6 Bxe6+ Rxe6 Qc7 Re2+ Kf3 Re3+ Kxe3 Re8+ Kf2 Re7 Qb8+ Re8 Qxe8#
30 #13 2.07G 0:15.51 Kg2 Qc7 Rfh1 Qxh2+ Rxh2 Rad8 Qc5 Bd7 Nxd5 exd5 Bxd5+ Be6 Bxe6+ Rxe6 Qc7 Re2+ Kf3 Re3+ Kxe3 Re8+ Kf2 Re7 Qb8+ Re8 Qxe8#
29 #15 1.99G 0:14.77 Kg2 Qc7 Rfh1 Qxh2+ Rxh2 d4 Qh3 Kf8 Bxc6 Ke7 Ne4 Kd8 Qa3 Kc8 Bxe8 Ra7 Qd6 Rc7 Bd7+ Kb7 Qb4+ Ka7 Qxd4+ Rc5 Qxc5+ Kb7 Nd6+ Ka8 Rh8#
29 +94.15! 1.97G 0:14.64 Kg2!
29 +79.52! 1.96G 0:14.58 Kg2!
29 +67.89! 1.96G 0:14.52 Kg2!
29 +58.38! 1.95G 0:14.49 Kg2!
29 +41.71? 1.95G 0:14.48 Kg2 Qc7?
29 +67.91! 1.95G 0:14.48 Kg2!
29 +62.85! 1.95G 0:14.48 Kg2!
29 +58.71! 1.95G 0:14.48 Kg2!
29 +55.33! 1.95G 0:14.48 Kg2!
29 +52.54! 1.95G 0:14.48 Kg2!
29 +50.23! 1.95G 0:14.48 Kg2!
29 +48.15! 1.95G 0:14.48 Kg2!
29 +46.38! 1.95G 0:14.48 Kg2!
29 +45.00! 1.95G 0:14.48 Kg2!
29 +43.82! 1.92G 0:14.24 Kg2!
28 10 seconds
28 +42.89 1.91G 0:14.16 Kg2 Qc7 Rfh1 Qxh2+ Rxh2 dxe4 Qc5 Rad8 Qxc6 Re7 Qxe4 Ree8 Qb7 Rd2+ Kg1 Rg2+ Rxg2 Rf8 Qe7
28 +46.61! 1.91G 0:14.14 Kg2!
28 +38.50! 1.90G 0:14.10 Kg2!
28 +31.75! 1.85G 0:13.68 Kg2!
28 +26.72! 1.84G 0:13.59 Kg2!
28 +22.71! 1.82G 0:13.45 Kg2!
28 +19.51! 1.80G 0:13.37 Kg2!
28 +16.95! 1.80G 0:13.34 Kg2!
28 +14.92! 1.80G 0:13.33 Kg2!
28 +13.31! 1.66G 0:12.35 Kg2!
28 +12.04! 1.62G 0:12.06 Kg2!
28 +10.20? 1.57G 0:11.70 Kg2 Qc7?
28 +12.86! 1.48G 0:11.06 Kg2!
28 +12.24! 1.40G 0:10.47 Kg2!
28 +11.75! 1.30G 0:09.81 Kg2!
28 +11.37! 1.24G 0:09.40 Kg2!
28 +11.08! 1.16G 0:08.80 Kg2!
28 +10.86! 1.06G 0:08.07 Kg2!
27 +10.64 885.1M 0:06.83 Kg2 d4 Rfh1 Kf8 Qxd4 Ke7 Qc5+ Kd7 Rd1+ Kc7 Qd6+ Kb6 a5+ Ka7 Qc5+ Kb8 Bxc6 Ra7 Qd6+ Qc7 Bxe8 Qxd6 Rxd6 Rc7 Rh8 Rc5 Rxa6 Rxa5 Rxa5
27 +10.01! 771.4M 0:06.01 Kg2!
27 +9.48! 684.6M 0:05.38 Kg2!
27 +9.07! 612.2M 0:04.85 Kg2!
27 +8.75! 580.3M 0:04.62 Kg2!
27 +8.51! 553.7M 0:04.42 Kg2!
27 +8.32! 532.0M 0:04.26 Kg2!
26 +8.14 476.2M 0:03.84 Kg2 Bxa4 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Reb8 Qg7 Bc6 Qxf6 Rb4 Rd1 Re8 g7 Kc7 Qf7+ Kb6 Bf3 Rxb2 Qxe8 Bxe8 g8=Q Rxc2+ Ne2
26 +7.46! 453.1M 0:03.66 Kg2!
26 +6.91! 440.5M 0:03.56 Kg2!
26 +6.48! 436.0M 0:03.53 Kg2!
26 +6.15! 419.4M 0:03.40 Kg2!
26 +5.90! 408.9M 0:03.31 Kg2!
26 +5.71! 398.9M 0:03.23 Kg2!
26 +5.57! 382.9M 0:03.10 Kg2!
25 +5.43 331.0M 0:02.67 Kg2 Qc7 Rfh1 Qxh2+ Rxh2 Rad8 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxf6 Rd7 Bd3 Kc7 Bxa6 d4+ Kf2 Kb6 Be2 Kb7 a5 dxc3 Qxc3 Rc7 Qc5 Ka8 Qb6
24 +4.02 175.8M 0:01.41 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 Rh8 Rg1 Ke5 Kg2 Rhd8 Kf3 Rd2 g7 Rg8 Rh8 Rxg7 Rxg7 Rxc2 Rg2 Rc4 Re2+ Kd6 a5 Ra4 Bxa6
23 +3.83 130.5M 0:01.05 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 Rg8 Rg1 Kc5 b3 a5 Rf7 Rbf8 Rd1 Kb4 Rxf8 Rxf8 g7 Rg8 Rd7 Kc3 Rc7+ Kd4 Kg2 Ke5 Kf2 Kf6
22 +3.74 86.3M 0:00.70 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 a5 Rg1 Ke5 Rf7 Rf8 Re1+ Kf4 Rxe6 Kg5 Rxf8 Rxf8 Kg2 Rg8 Bf3 Kh6 b3 Rc8 c4 Rg8
21 +3.64 48.4M 0:00.40 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 Rg8 Rg1 a5 Rf7 Rgf8 Rd1+ Ke5 Rxf8 Rxf8 g7 Rg8 Rd7 Kf6 b4 axb4 a5 Kg6
20 +3.65 37.3M 0:00.31 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 a5 Rg1 Ke5 Rf7 Rf8 Re1+ Kd6 Rd1+ Ke5 Rxf8 Rxf8 g7 Rg8 Rd7 Kf4 Kg2 Kg5
19 +3.38 25.6M 0:00.22 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 a5 Rf7 Rh8+ Kg2 Rhf8 Rd1+ Ke5 Rdd7 Rxf7 Rxf7 Rg8 g7 Kf4 Rc7 Kg5 Kf3 Kg6
18 +3.44 17.3M 0:00.16 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Rh7 Rg8 Rg1 a5 Rf7 Rgf8 Rd1+ Ke5 Re1+ Kd6 Rxf8
17 +3.16 12.3M 0:00.11 Bg2 f5 Qh3 Kf8 Nxd5 Bxd5 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bxb7 Rab8 Bxa6 Rg8 Rg1 Rxb2 g7 Rb4 Rh8 Rxg7 Rxg7 Rxa4 Bb5 Ra1+ Kg2 Ke5
16 +2.88 6.65M 0:00.06 Qh3 Kf8 Nxd5 exd5 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Bd3 Qxf6 Rxf6 Bd7 Rh7 Be6 Kg2 Rb8 b3 Rb6 Kf2 Rg8 Ra7 Ke8 g7
15 +2.81 5.26M 0:00.05 Qh3 Kf8 Nxd5 exd5 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Bd3 Qxf6 Rxf6 Bxa4 Rh7 Bd7 Rd6 Ra7 Bf5 Re1+ Kh2
14 +2.68 3.97M 0:00.04 Qh3 Kf8 Nxd5 exd5 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Bd3 Bd7 Rh7 Qxf6 Rxf6
13 +2.08 3.07M 0:00.03 Qh3 Kf8 Nxd5 exd5 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Bd3 Qxf6 Rxf6 Bxa4 Rh7 Bd7 Rd6 Ra7 Kg1 Rc7
12 +2.02 2.63M 0:00.03 Qh3 Kf8 Nxd5 exd5 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Rh7 Qxf6 Rxf6 Rxe4 Rd6+ Ke8 Rxc6 Re1+ Kh2
11 +2.12 1.14M 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2 f5 Ne2 Rg8
10 +1.95 1.10M 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2 f5 Ne2
9 +2.18 458711 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2 Rab8 Rxf6
8 +2.06 355940 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd6 Qxb7 Bxb7 Bg2 Rac8 Kg1 Rc7 Rxf6
7 +2.94 133052 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Qxe7+ Kxe7
6 +2.87 121767 0:00.01 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Qxe7+ Kxe7 Bd3
5 +2.87 108950 0:00.00 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7
4 +2.84 97676 0:00.00 Qh3 Kf8 Qh8+ Ke7 Qxg7+ Kd8 Qxf6+ Qe7 Qxe7+ Kxe7
3 +2.89 85322 0:00.00 Qh3 Kf8 Qh8+ Ke7
2 +2.82 32769 0:00.00 Qh3 Kf8
1 NNUE evaluation using ninu.bin enabled
1 +1.77 17940 0:00.00 Bd3 Qxb2
0 #
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Jouni
Posts: 2328
Joined: Wed Mar 08, 2006 7:15 pm

Re: Interesting mate in 8

Post by Jouni » Thu Jan 14, 2021 2:00 pm

Dann You should invest for faster CPU :) . Stockfish solves fast:

Analysis by Stockfish 110121:

1.Kg2 Qc7 2.Rh7 d4 3.Rfh1 Bxe4+ 4.Qxe4 Kf8 5.Nd5 Qf7 6.Rh8+ Qg8 7.Rxg8+ Kxg8 8.Qh4 exd5 9.Qh8#
+- (#9) Depth: 52/18 00:00:02 24026kN, tb=29
1.Rf3 Qc7 2.Rh7 Qf7 3.Rh8+ Kxh8 4.gxf7 g5 5.Rxf6 Kg7 6.f8R Rxf8 7.Qxg5+ Kh8 8.Rh6#
+- (#8) Depth: 53/18 00:00:02 28540kN, tb=29
Jouni

Dann Corbit
Posts: 11859
Joined: Wed Mar 08, 2006 7:57 pm
Location: Redmond, WA USA
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Re: Interesting mate in 8

Post by Dann Corbit » Thu Jan 14, 2021 5:54 pm

I guess mine loaded up on krill and he wasn't very hungry.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

MikeGL
Posts: 990
Joined: Thu Sep 01, 2011 12:49 pm

Re: Interesting mate in 8

Post by MikeGL » Thu Jan 14, 2021 6:20 pm

Dann Corbit wrote:
Wed Jan 13, 2021 8:26 pm

Rf3 is mate in 8.
There are a couple other mating moves.
And engines like Bg2 which probably wins.
But the thing that is interesting to me is that I think most humans would play the obvious looking Rf3.
Stockfish took a long time to find it on my machine.
Winning plan: Rf3 Qc7 Rh7 Qf7 Rh8+ Kxh8 gxf7 g5 Rxf6 Kg7 f8=R Rxf8 Qxg5+ Kh8 Rh6#
Good position. Thanks for sharing.

I checked with my 12 year old laptop, 32-bit and set to use only single core for this position
SF12 with NNUE: Takes forever and prefers Bg2 (single core)
SF12 untick / disable NNUE: Finds mate #8 within 14 seconds. (single core)
I told my wife that a husband is like a fine wine; he gets better with age. The next day, she locked me in the cellar.

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