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Up Topic The Rybka Lounge / Test Positions / It seems to be easy
- - By dorszcz (*) Date 2018-12-06 12:10
It's strange but most engines have problem with it.

E8500 2x3.16GHz, 5-men Syzygy on SSD:

Stockfish 10 didn't find the move in 60 minutes.
asmFishWCP_2018-10-17 found it in 32 minutes.
Sting 10.1 needed only 1 second.

Find checkmate. If your engine shows +4, +7 , +12 etc. for white it means it's wrong move.

5brq/4p1kp/4K1Np/2p4p/2P4B/4N2B/4P3/8 w - - 0 1

Author Viktor Syzonenko
Parent - - By Vinvin (***) Date 2018-12-06 12:52 Edited 2018-12-06 12:55
Stockfish-Matefinder 10 finds it immediately as Sting :


MateFinder.10.x64.bmi2:
...
16/25  00:00   650k  5.800k  +1,68  1.Nxh8 Kxh8 2.Kf7 e6 3.Bxe6 Bg7 4.Be7 h4 5.Bf5 Ra8 6.Bxh4 h5 7.Be7 Ra7 8.Ke6 Bd4 9.Nd5 Ra6+ 10.Kd7 Ra4
17/26  00:00   992k  6.125k  +1,75  1.Nxh8 Kxh8 2.Kf7 Bg7 3.Bxe7 h4 4.Bxc5 Be5 5.Bf5 Rg3 6.Ng4 Bg7 7.Bd6 h5 8.Nf6 Rc3 9.Nxh5 Bd4
18/27  00:00   1.628k  6.435k  +2,10  1.Nxh8 Kxh8 2.Kf7 Bg7 3.Bxe7 Rb8 4.Bf5 Rb7 5.Be4 Ra7 6.Nf5 Bc3 7.Ke6 Ra6+ 8.Kd7 Ra4 9.Bd5 h4
19/25  00:00   2.268k  6.499k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
20/12  00:00   2.495k  6.567k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
21/12  00:00   2.704k  6.610k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
22/12  00:00   2.975k  6.715k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
23/12  00:00   3.267k  6.793k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
24/12  00:00   3.314k  6.805k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
25/12  00:00   3.806k  6.920k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
26/12  00:00   4.050k  7.019k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
27/12  00:00   4.667k  7.146k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
28/12  00:00   4.734k  7.163k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
29/12  00:00   5.415k  7.298k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
30/12  00:00   6.351k  7.368k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
31/12  00:00   7.697k  7.720k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
32/12  00:01   8.093k  7.858k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
33/12  00:01   9.220k  8.202k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
34/12  00:01   12.046k  8.949k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
35/12  00:01   13.770k  9.323k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
36/12  00:01   14.666k  9.437k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
37/12  00:01   17.222k  9.396k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
38/12  00:02   21.547k  9.632k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
39/12  00:02   25.757k  9.861k  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5+
Parent - By user923005 (****) Date 2018-12-06 22:46
And for mates in 7 or less like this one, Chest is a very good choice:
Q:\>chest319 -b -M 1000 -z7 emat.epd
5brq/4p1kp/4K1Np/2p4p/2P4B/4N2B/4P3/8 w - - acn 190815; acs 0; bm Nf5+; ce 32756; dm 6;
pv Nf5+ Kxg6 Ng7 Kxg7 e3 Kg6 Bf5+ Kg7 Bg3 h4 Be5#;
Parent - - By cc2150dx (**) Date 2018-12-07 16:43
Houdini 6 finds it in 1:41

FEN:
5brq/4p1kp/4K1Np/2p2N1p/2P4B/7B/4P3/8 b - - 1 1


Houdini 6:
14/32  00:00   2,340k  11,941k  +1.73  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-d5 Rg8-g7+ Kf7-e6 Rg7-g1 e2-e3 Rg1-e1 Ke6-f7 Bd4-g7 Be7xc5 Re1-c1 Bf5-d3 h5-h4 Kf7-e6
15/34  00:00   4,193k  12,083k  +1.78  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 h5-h4 Be7xh4 Rg8-a8 Bh4-e7 Ra8-a5 Bf5-e4 Be5-b2 Ne3-f5 h6-h5 Be4-d5
16/34  00:00   4,871k  12,147k  +1.71  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 h5-h4 Ne3-d5 Rg8-g5 Be7xg5 h6xg5 e2-e4 Be5-d4 Nd5-f6 Bd4-c3 Kf7-e6
17/38  00:00   6,404k  12,175k  +1.72  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-a1 Ne3-f5 Rg8-g1 Be7xc5 Rg1-c1 Nf5-d6 Ba1-g7 Bh3-f5 h5-h4 Bc5-f2 Rc1-h1 c4-c5 h4-h3 Kf7-e6
18/38  00:00   8,595k  12,296k  +1.72  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-d5 Rg8-g7+ Kf7-e6 Rg7-g1 e2-e3 Rg1-e1 Be7-h4 Re1-h1 e3xd4 Rh1xh4 d4xc5 Rh4xc4 Ke6-d6 Kh8-g7 c5-c6
19/48  00:00   11,112k  12,333k  +1.87  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-d5 Rg8-g7+ Kf7-e6 Rg7-g1 e2-e3 Rg1-e1 Be7-h4 Re1-h1 e3xd4 Rh1xh4 d4xc5 Rh4xc4 Ke6-d6 Kh8-g7 c5-c6 h5-h4 c6-c7 Rc4xc7 Nd5xc7
20/48  00:01   23,049k  12,358k  +1.97  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-a1 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a2 Bg2-f3 Ra2-c2 Nf5-e3 Rc2-a2 Bf3xh5 Ra2-a4 Bh5-f3 h6-h5 Bf3xh5 Ba1-d4 Bh5-f3 h7-h6 Ne3-f5 Ra4xc4 Nf5xd4
21/48  00:04   51,196k  12,606k  +2.21  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 h5-h4 Be7xc5 Rg8-a8 Ne3-g4 Ra8-a5 Bc5-b6 Ra5-a6 c4-c5 Be5-d4 e2-e3 Bd4-g7 Ng4-h2 Ra6-a8 e3-e4 Ra8-b8 Kf7-e6 Kh8-g8 Nh2-f3
21/48  00:04   52,781k  12,602k  +2.21  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 h5-h4 Be7xc5 Rg8-a8 Ne3-g4 Ra8-a5 Bc5-b6 Ra5-a6 c4-c5 Be5-d4 e2-e3 Bd4-g7 Ng4-h2 Ra6-a8 e3-e4 Ra8-b8 Kf7-e6 Kh8-g8 Nh2-f3
22/50+  00:06   80,378k  12,551k  +2.28  Ng6xh8
22/50-  00:06   85,254k  12,544k  +2.21  Ng6xh8 Kg7xh8
22/50+  00:07   93,816k  12,567k  +2.28  Ng6xh8
22/50-  00:07   97,390k  12,563k  +2.19  Ng6xh8 Kg7xh8
22/50+  00:08   112,509k  12,579k  +2.31  Ng6xh8
22/51  00:12   161,742k  12,568k  +2.34  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-b2 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a7 e2-e4 h5-h4 Kf7-e6 Ra7-a6+ Be7-d6 Bb2-c1 Nf5xh4 Ra6-a4 Ke6-d5 Ra4-a2 Bg2-f3 Ra2-d2+ Kd5-e6 Rd2-c2 Ke6-f7 Bc1-b2 e4-e5 Rc2xc4 e5-e6
22/51  00:12   161,920k  12,567k  +2.34  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-b2 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a7 e2-e4 h5-h4 Kf7-e6 Ra7-a6+ Be7-d6 Bb2-c1 Nf5xh4 Ra6-a4 Ke6-d5 Ra4-a2 Bg2-f3 Ra2-d2+ Kd5-e6 Rd2-c2 Ke6-f7 Bc1-b2 e4-e5 Rc2xc4 e5-e6
23/51+  00:13   174,216k  12,579k  +2.41  Ng6xh8
23/51+  00:16   206,388k  12,582k  +2.48  Ng6xh8
23/51-  00:16   208,785k  12,570k  +2.41  Ng6xh8 Kg7xh8
23/51  00:17   214,128k  12,564k  +2.30  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-b2 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a7 e2-e4 h5-h4 Kf7-e6 Ra7-a6+ Be7-d6 Bb2-c1 Nf5xh4 Bc1-g5 Nh4-f5 h6-h5 Ke6-d5 h5-h4 e4-e5 Ra6-a2 Bg2-e4 h4-h3 e5-e6 h3-h2 e6-e7 Bg5xe7 Bd6xe7 Kh8-g8
23/51  00:17   215,252k  12,562k  +2.30  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-b2 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a7 e2-e4 h5-h4 Kf7-e6 Ra7-a6+ Be7-d6 Bb2-c1 Nf5xh4 Bc1-g5 Nh4-f5 h6-h5 Ke6-d5 h5-h4 e4-e5 Ra6-a2 Bg2-e4 h4-h3 e5-e6 h3-h2 e6-e7 Bg5xe7 Bd6xe7 Kh8-g8
24/53+  00:18   226,758k  12,580k  +2.37  Ng6xh8
24/53+  00:18   235,176k  12,594k  +2.44  Ng6xh8
24/60+  00:23   293,788k  12,579k  +2.55  Ng6xh8
24/60  00:28   361,884k  12,555k  +2.47  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 h5-h4 Be7xc5 h6-h5 Ne3-d5 Rg8-g2 Bc5-e3 Rg2xe2 c4-c5 h4-h3 Bf5xh3 Re2-c2 Kf7-e6 Be5-g3 Bh3-f5 Rc2-c4 Nd5-b6 Rc4-h4 c5-c6 Kh8-g7 Ke6-d7 Bg3-e5 Nb6-d5 Rh4-c4 Bf5-d3 Rc4xc6 Kd7xc6
24/60  00:28   363,647k  12,555k  +2.47  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 h5-h4 Be7xc5 h6-h5 Ne3-d5 Rg8-g2 Bc5-e3 Rg2xe2 c4-c5 h4-h3 Bf5xh3 Re2-c2 Kf7-e6 Be5-g3 Bh3-f5 Rc2-c4 Nd5-b6 Rc4-h4 c5-c6 Kh8-g7 Ke6-d7 Bg3-e5 Nb6-d5 Rh4-c4 Bf5-d3 Rc4xc6 Kd7xc6
25/60  00:31   399,345k  12,542k  +2.41  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-c2 Bd4-b2 Be7xc5 h5-h4 e2-e4 Rg8-g7+ Kf7-e6 Rg7-g2 Nc2-b4 Bb2-a3 Bc5-d4+ Kh8-g8 Nb4-d5 Rg2-d2 Bd4-c3 Rd2-c2 e4-e5 Rc2-f2 Bc3-d4 Rf2-f3 Bf5-e4 Rf3-f1 c4-c5 Ba3xc5 Bd4xc5 h4-h3 Ke6-d7 Rf1-e1 e5-e6 h3-h2
25/60  00:32   403,152k  12,542k  +2.41  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-c2 Bd4-b2 Be7xc5 h5-h4 e2-e4 Rg8-g7+ Kf7-e6 Rg7-g2 Nc2-b4 Bb2-a3 Bc5-d4+ Kh8-g8 Nb4-d5 Rg2-d2 Bd4-c3 Rd2-c2 e4-e5 Rc2-f2 Bc3-d4 Rf2-f3 Bf5-e4 Rf3-f1 c4-c5 Ba3xc5 Bd4xc5 h4-h3 Ke6-d7 Rf1-e1 e5-e6 h3-h2
26/64+  00:33   417,487k  12,536k  +2.48  Ng6xh8
26/64-  00:34   432,903k  12,519k  +2.41  Ng6xh8 Kg7xh8
26/64+  00:35   447,089k  12,510k  +2.48  Ng6xh8
26/64-  00:36   461,339k  12,490k  +2.39  Ng6xh8 Kg7xh8
26/64+  00:37   472,746k  12,483k  +2.51  Ng6xh8
26/64  00:45   571,460k  12,454k  +2.58  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-a1 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a2 Bg2-f3 h5-h4 Be7xh4 h6-h5 Kf7-e6 Ra2-a6+ Ke6-d5 Ba1-f6 Bh4-f2 h5-h4 Nf5xh4 Kh8-g7 Kd5xc5 Ra6-a1 Nh4-f5+ Kg7-g6 Nf5-e3 h7-h5 Kc5-d5 Ra1-a8 c4-c5 Ra8-d8+ Kd5-c4 Rd8-e8 Ne3-d5 Bf6-g5
26/64  00:45   571,558k  12,454k  +2.58  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-a1 Ne3-f5 Rg8-a8 Bh3-g2 Ra8-a2 Bg2-f3 h5-h4 Be7xh4 h6-h5 Kf7-e6 Ra2-a6+ Ke6-d5 Ba1-f6 Bh4-f2 h5-h4 Nf5xh4 Kh8-g7 Kd5xc5 Ra6-a1 Nh4-f5+ Kg7-g6 Nf5-e3 h7-h5 Kc5-d5 Ra1-a8 c4-c5 Ra8-d8+ Kd5-c4 Rd8-e8 Ne3-d5 Bf6-g5
27/64+  00:52   656,477k  12,445k  +2.65  Ng6xh8
27/64-  00:58   729,432k  12,438k  +2.58  Ng6xh8 Kg7xh8
27/64-  00:59   738,641k  12,438k  +2.47  Ng6xh8 Kg7xh8
27/64+  01:00   753,907k  12,440k  +2.56  Ng6xh8
27/64+  01:14   923,326k  12,377k  +2.76  Ng6xh8
27/64  01:27   1,080,335k  12,354k  +2.75  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-c2 Bd4-e5 Be7xc5 Rg8-g2 Bc5-e3 Rg2xe2 c4-c5 Re2-g2 Kf7-e6 Be5-b2 Be3xh6 Rg2-g3 c5-c6 Rg3-c3 Ke6-d7 Rc3-c5 c6-c7 Bb2-e5 c7-c8Q+ Rc5xc8 Kd7xc8 Be5-g7 Bh6-g5 Bg7-f8 Kc8-d7 Kh8-g8 Nc2-d4 Bf8-c5 Nd4-e6 Bc5-a3
27/64  01:27   1,080,525k  12,353k  +2.75  Ng6xh8 Kg7xh8 Ke6-f7 Bf8-g7 Bh4xe7 Bg7-e5 Bh3-f5 Be5-d4 Ne3-c2 Bd4-e5 Be7xc5 Rg8-g2 Bc5-e3 Rg2xe2 c4-c5 Re2-g2 Kf7-e6 Be5-b2 Be3xh6 Rg2-g3 c5-c6 Rg3-c3 Ke6-d7 Rc3-c5 c6-c7 Bb2-e5 c7-c8Q+ Rc5xc8 Kd7xc8 Be5-g7 Bh6-g5 Bg7-f8 Kc8-d7 Kh8-g8 Nc2-d4 Bf8-c5 Nd4-e6 Bc5-a3
28/64+  01:38   1,210,611k  12,344k  +2.82  Ng6xh8
28/64-  01:41   1,253,230k  12,340k  +2.75  Ng6xh8 Kg7xh8
28/64+  01:41   1,258,066k  12,342k  +M6  Ne3-f5+
28/64  01:41   1,258,434k  12,342k  +M6  Ne3-f5+ Kg7xg6 Nf5-g7 Kg6xg7 e2-e4 Kg7-g6 Bh3-f5+ Kg6-g7 Bh4-g3 h5-h4 Bg3-e5+
Parent - By zbu Date 2019-02-05 14:31
Rybka 4.1 found in 42s
Parent - - By Peter Grayson (****) Date 2019-02-06 08:36
Sometimes the old school engines are better at finding these types of mates ...

New game
5brq/4p1kp/4K1Np/2p4p/2P4B/4N2B/4P3/8 w - - 0 1


Analysis by Deep Fritz 8:

1.Nxh8 Kxh8 2.Kd5 Rg6 3.Kxc5 e6+ 4.Kc6 e5+ 5.Kd5
  +-  (2.27)   Depth: 7/13   00:00:00  19kN
1.Nxh8 Kxh8 2.Kd5 Rg6 3.Kxc5 e6+ 4.Kc6 e5+ 5.Kd5
  +-  (2.27)   Depth: 8/13   00:00:00  30kN
1.Nxe7
  +-  (2.27)   Depth: 8/14   00:00:00  37kN
1.Nxe7
  +-  (2.48)   Depth: 8/17   00:00:00  37kN
1.Nxe7
  +-  (2.76)   Depth: 9/23   00:00:00  52kN
1.Nxe7 Bxe7 2.Nf5+ Kg6 3.Nxe7+ Kg7 4.Bf6+ Kf8 5.Bxh8 Rxh8 6.Ng8
  +-  (2.79)   Depth: 9/23   00:00:00  56kN
1.Nxe7 Bxe7 2.Nf5+ Kg6 3.Nxe7+ Kg7 4.Bf6+ Kf8 5.Bxh8 Rxh8 6.Ng8
  +-  (2.79)   Depth: 10/19   00:00:00  100kN
1.Nf5+
  +-  (#6)   Depth: 10/19   00:00:00  125kN
1.Nf5+
  +-  (#6)   Depth: 10/23   00:00:00  159kN

(Grayson, Newport, South Wales 06.02.2019)

Analysis by Deep HIARCS 14 WCSC NL:

1.Nxh8 Kxh8 2.Kd5 e5 3.Be6 Rg6 4.Nf5 Bg7 5.Bf7
  +/-  (1.42)   Depth: 18/34   00:00:01  1353kN
1.Nxh8 Kxh8 2.Kd5 Rg1 3.Be6 Bg7 4.Bxe7 Re1 5.Nf5 Rxe2 6.Nxg7 Rd2+ 7.Ke5 Kxg7 8.Bxc5 Kg6 9.Bd4
  +/-  (1.49)   Depth: 18/35   00:00:02  2473kN
1.Nxh8 Kxh8 2.Kd5 Rg1 3.Be6 Bg7 4.Bxe7 Re1 5.Nf5 Rxe2 6.Nxg7 Rd2+ 7.Ke5 Kxg7 8.Bxc5 h4 9.Bd4 Kf8 10.c5 Ke7 11.Bf5 Kd8 12.Bc3 Re2+ 13.Kd6 Re7 14.Ba5+
  +/-  (1.41)   Depth: 19/35   00:00:02  2664kN
1.Nxh8 Kxh8 2.Kd5 Bg7 3.Bxe7
  +/-  (1.60)   Depth: 20/38   00:00:02  3652kN
1.Nxh8 Kxh8 2.Kd5 Rg1 3.Be6 Bg7 4.Bxe7 Re1 5.Nf5 Rxe2 6.Nxg7 Rd2+ 7.Ke5 Kxg7 8.Bxc5 Rd1 9.Bd4 Kf8 10.Bf5 Re1+ 11.Kd5 Rf1
  +/-  (1.39)   Depth: 21/43   00:00:04  8167kN
1.Nxh8 Kxh8 2.Kd5 Rg1 3.Be6 Bg7 4.Bxe7 Re1 5.Nf5 Rxe2 6.Nxg7 Rd2+ 7.Ke5 Kxg7 8.Bxc5 Rd1 9.Bd4 Kf8 10.Bf5 Ke8 11.c5 Kd8 12.Bf2 Kc7 13.Be4 Rd2 14.Bg3
  +/-  (1.54)   Depth: 22/43   00:00:04  8811kN
1.Nf5+
  +-  (#6)   Depth: 22/43   00:00:04  8849kN
1.Nf5+ Kxg6 2.Ng7 Kxg7
  +-  (#6)   Depth: 22/43   00:00:04  8862kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 23/43   00:00:04  8989kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 24/43   00:00:04  9146kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 25/43   00:00:05  9351kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 26/43   00:00:05  9580kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 27/43   00:00:05  9892kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 28/43   00:00:05  10290kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 29/43   00:00:05  10815kN
1.Nf5+ Kxg6 2.Ng7 Kxg7 3.e4 Kg6 4.Bf5+ Kg7 5.Bg3 h4 6.Be5#
  +-  (#6)   Depth: 30/43   00:00:05  11416kN
Parent - By zbu Date 2019-02-08 06:58
FEN:
5brq/4p1kp/4K1Np/2p4p/2P4B/4N2B/4P3/8 w - - 0 1


Critter-16a-64bit:
17/44  00:01        4,959k  5,226k  +1.39  Ng6xh8 Kg7xh8 Ne3-f5 Rg8-g1 e2-e4 Kh8-g8 Nf5xe7+ Kg8-h8 Ne7-f5 Bf8-g7 Nf5xg7 Kh8xg7 Ke6-e7 Rg1-g5 Bh3-f5 Kg7-g8 Ke7-d6 Rg5-g2 Kd6xc5 Rg2-h2 Bh4-g3 Rh2-g2 Bg3-e1 Kg8-f7 Bf5xh7
17/44+  00:01        5,101k  5,237k  +1.47  Ne3-f5+ Kg7xg6 Bh4xe7 Bf8xe7 Nf5xe7+ Kg6-g5 Ne7xg8 Qh8xg8+ Ke6-d6 Qg8xc4
17/44+  00:01        5,102k  5,159k  +22.93  Ne3-f5+ Kg7xg6 Bh4xe7 Bf8xe7 Nf5xe7+ Kg6-g5 Ne7xg8 Qh8xg8+ Ke6-d6 Qg8xc4
17/44  00:01        5,108k  5,160k  +M6  Ne3-f5+ Kg7xg6 Nf5-g7 Kg6xg7 e2-e4 Kg7-g6 Bh3-f5+ Kg6-g7 Bh4-g3 h5-h4 Bg3-e5+
Parent - By Vinvin (***) Date 2019-02-10 00:12
You can download SF MateFinder here : http://chess.ultimaiq.net/stockfish.html

with 1 core @4 GHz
Matefinder_190203:
...
20/36  00:00   1 175 046  1 669 099  +3,09  1.Nxh8 Kxh8 2.Nf5 Bg7 3.Bxe7 Ra8 4.Bxc5 Ra2 5.Nxg7 Kxg7 6.e4 Rh2 7.Bd4+ Kf8 8.Bf5 h4 9.Kd5 Rh1 10.c5 h3 11.c6
21/27  00:00   1 624 371  1 649 107  +3,25  1.Nxh8 Kxh8 2.Nf5 Rg1 3.Kf7 Bg7 4.Nxg7 Rxg7+ 5.Kf8 Rg8+ 6.Kxe7 Rg7+ 7.Kd6 Rg6+ 8.Be6 Kg7 9.Ke7 Rg5 10.e4 Rg6 11.e5 Rg5
22/42  00:01   2 595 839  1 711 166  +3,43  1.Nxh8 Kxh8 2.Nf5 Rg6+ 3.Kf7 e6 4.Ne7 Bxe7 5.Kxe7 Rg7+ 6.Kd6 Kg8 7.Bf6 Rg3 8.Bxe6+ Kf8 9.e4 h4 10.Bxh4 Rg6 11.e5 h5 12.Bf6 Rh6 13.Kxc5
23/32  00:01   3 287 164  1 704 076  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
24/12  00:02   3 465 134  1 718 816  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
25/12  00:02   3 719 691  1 735 740  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
26/12  00:02   3 904 955  1 752 672  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
27/12  00:02   4 160 098  1 765 746  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
28/12  00:02   4 408 810  1 778 463  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
29/12  00:02   4 727 663  1 818 331  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
30/12  00:02   5 142 970  1 816 020  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
31/12  00:03   5 608 185  1 864 423  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
32/12  00:03   6 409 737  1 946 473  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
33/12  00:03   7 070 606  2 002 437  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
34/12  00:03   8 254 914  2 087 737  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
35/12  00:04   9 071 993  2 135 591  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
36/12  00:04   10 446 172  2 195 957  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
37/12  00:05   11 343 480  2 222 033  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
38/12  00:05   13 107 519  2 264 993  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
39/12  00:06   14 275 388  2 284 062  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
40/12  00:06   14 815 913  2 273 774  +M6  1.Nf5+ Kxg6 2.Ng7 Kxg7 3.Bg2 Kg6 4.Be4+ Kg7 5.Bg3 h4 6.Be5+
- By McBrain Date 2019-02-08 02:22
McCain-X1-m ("m" for matefinder version - soon to be released - single thread)

dep  score  nodes  time  (not shown:  tbhits  knps  seldep)
19      #6   1.40M    0:00.72  Nf5+ Kxg6 Ng7 Kxg7 e4 Kg6 Bf5+ Kg7 Bg3 h4 Be5#
18      #6   647398  0:00.46  Nf5+ Kxg6 Ng7 Kxg7 e4 Kg6 Bf5+ Kg7 Bg3 h4 Be5#
17  +1.27   526524  0:00.38  Nxh8 Kxh8 Kf7 e6 Bxe6 Bg7 Be7 h4 Bf5 Ra8 Bxh4 h5 Be7 h4 Bxh4 Ra7+ Ke6 Ra2 Bd3 Bd4 Nf5
16  +1.29   252217  0:00.18  Nxh8 Kxh8 Kf7 Bg7 Bxe7 Bb2 Bxc5 Rg3 Bf5 h4 Nd1 Ba1 Bf2 Rg7+ Ke6 Rc7 Kd5
15  +1.17   210711  0:00.15  Nxh8 Kxh8 Kf7 Bg7 Bxe7 Bb2 Bxc5 Rg6 Bf5 Rc6 Be7 Bd4 Be4 Rc7 Nf5 Be5
14  +1.28   115606  0:00.08  Nxh8 Kxh8 Kf7 e5 Nf5 Bg7 Be7 e4 Bxc5 Bc3 Ke6 h4 Kd5 h5 Be7 e3 Nxe3
13  +1.05   72768    0:00.05  Nxh8 Kxh8 Kf7 e6 Bxe6 Bg7 Be7 Be5 Nf5 Rg2 Bxc5 Rxe2 Bd5
12  +1.06   62917    0:00.05  Nxh8 Kxh8 Kf7 e6 Bxe6 Bg7 Be7 Be5 Bxc5 Rg7+ Ke8 Rc7 Bf8 Rc6
11  +1.02   15239    0:00.01  Nxh8 Kxh8 Bf5 Rg7 Bd3 Rg8 Bf2 Bg7 Nf5 Ra8 Bxc5
10  +1.00   9371      0:00.01  Nxh8 Kxh8 Bf5 Rg7 Nd5 Rg1 Nxe7 Rg2 Bf6+ Bg7
  9  +0.98   4634      0:00.01  Nxh8 Kxh8 Bf5 Bg7 Nd5 Re8 Bxe7
  8  +0.87   3604      0:00.00  Nxh8 Kxh8 Bf5 Rg7 Kd5 e6+ Bxe6 Be7
  7  +0.87   1687      0:00.00  Nxh8 Kxh8 Kd5 e5 Kxe5 Rg1 Bf5
  6  +0.82   698        0:00.00  Nxh8 Kxh8 Kd5 Rg6 Be6
  5  +0.72   496        0:00.00  Nxh8 Kxh8 Kd5 Rg6 Kxc5
  4  +0.72   369        0:00.00  Nxh8 Kxh8 Kd5 Rg6
  3  +0.63   232        0:00.00  Nxh8 Kxh8 Bf5
  2  +0.54   71          0:00.00  Nxh8 Kxh8
  1  +0.54   38          0:00.00  Nxh8 Kxh8
  1  Found 1511 tablebases
  0  #
Up Topic The Rybka Lounge / Test Positions / It seems to be easy

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