Chess Engine Puzzle (High Difficulty)

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Nathanael Russell
Posts: 803
Joined: Sat Jan 31, 2015 11:50 pm
Location: Philadelphia, USA

Chess Engine Puzzle (High Difficulty)

Post by Nathanael Russell »

Image

White to move and win.

How long does it take for your favorite chess engine to find 1.Nf6+ (Advantage White)?
Core_Engine_Tester_CCRL
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: Chess Engine Puzzle (High Difficulty)

Post by kgburcham »

[D] 8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - -

Engine: Deep Rybka 4.1 SSE42 x64 (4096 MB)
by Vasik Rajlich

21.03 0:15 -1.94++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 Nxd8+ 6.Kf5 e2 7.Be4 e1Q 8.Bf3+ (16.722.319) 1086 TB:124
21.01 0:15 -1.79++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 Nxd8+ 6.Kf5 e2 7.Be4 (16.936.204) 1078 TB:124
21.01 0:16 -1.39++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 Nxd8+ 6.Kf5 e2 7.Be4 (17.435.651) 1066 TB:125
21.01 0:17 -0.59++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 Nxd8+ 6.Kf5 e2 7.Be4 (18.649.393) 1054 TB:130
21.01 0:19 +1.01++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 Nxd8+ 6.Kf5 e2 7.Be4 (20.471.733) 1052 TB:140
21.01 0:59 +4.21++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 (63.944.235) 1071 TB:2.077
21.01 1:05 +4.21++ 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Nf7+ 5.Ke6 (70.846.054) 1082 TB:2.077


Engine: Houdini 4 Pro x64 (4096 MB)
by Robert Houdart

27/65 0:35 -1.69++ 1.Nf6+ (948.629.220) 26961 TB:69.074
27/65 0:35 -1.52++ 1.Nf6+ (968.231.192) 26937 TB:72.040
other best move - reduce depth to 24
24/65 0:36 -1.15++ 1.Nf6+ (972.776.128) 26922 TB:72.264
24/65 0:36 -0.29++ 1.Nf6+ (986.245.631) 26881 TB:73.372
24/73 0:44 +2.14++ 1.Nf6+ (1.181.110.066) 26837 TB:100.054
24/86 1:38 +3.24 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Ba3 7.Bd1+ Kh3 8.Qxe3 Nb4+ 9.Kb5 c2 10.g4+ Kg2 11.Qd2+ Kg3 12.Qc3+ Kh4 13.Qe1+ Kh3 14.Qe3+ (2.816.966.996) 28591 TB:277.277
no chess program was born totally from one mind. all chess programs have many ideas from many minds.
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Chess Engine Puzzle (High Difficulty)

Post by zullil »

Nathanael Russell wrote: White to move and win.

How long does it take for your favorite chess engine to find 1.Nf6+ (Advantage White)?
Add this to the list of positions that Stockfish struggles with:

Code: Select all

info depth 47 seldepth 63 multipv 1 score cp -217 lowerbound nodes 33177979556 nps 37955255 hashfull 999 tbhits 0 time 874134 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -211 lowerbound nodes 33539573440 nps 37950911 hashfull 999 tbhits 0 time 883762 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -201 lowerbound nodes 34034951948 nps 37978358 hashfull 999 tbhits 0 time 896167 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -187 lowerbound nodes 34490820374 nps 38003482 hashfull 999 tbhits 0 time 907570 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -167 lowerbound nodes 35562258612 nps 38120854 hashfull 999 tbhits 0 time 932882 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -135 lowerbound nodes 36152565479 nps 38131233 hashfull 999 tbhits 0 time 948109 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -88 lowerbound nodes 38789858719 nps 38221429 hashfull 999 tbhits 0 time 1014872 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp -18 lowerbound nodes 39454127323 nps 38215042 hashfull 999 tbhits 0 time 1032424 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp 86 lowerbound nodes 40475040234 nps 38237713 hashfull 999 tbhits 0 time 1058511 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp 243 lowerbound nodes 41815603191 nps 38264889 hashfull 999 tbhits 0 time 1092793 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 63 multipv 1 score cp 479 lowerbound nodes 45690789415 nps 38516414 hashfull 999 tbhits 0 time 1186268 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 104 multipv 1 score cp 833 lowerbound nodes 59023482429 nps 39526859 hashfull 999 tbhits 0 time 1493250 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 104 multipv 1 score cp 1364 lowerbound nodes 66899426746 nps 39915554 hashfull 999 tbhits 0 time 1676024 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 104 multipv 1 score cp 2160 lowerbound nodes 71089487227 nps 39982096 hashfull 999 tbhits 0 time 1778033 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 currmove d1e2 currmovenumber 5
info depth 47 seldepth 104 multipv 1 score cp 1563 upperbound nodes 73624773693 nps 40031674 hashfull 999 tbhits 0 time 1839163 pv g4f6 h7g7
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 seldepth 104 multipv 1 score cp 2458 lowerbound nodes 78492338360 nps 40129130 hashfull 999 tbhits 0 time 1955994 pv g4f6
info depth 47 currmove g4f6 currmovenumber 1
info depth 47 currmove d1a4 currmovenumber 5
info depth 47 seldepth 104 multipv 1 score cp 4302 nodes 91200281237 nps 41291758 hashfull 999 tbhits 0 time 2208680 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 d8f6 g4g3 f6e5 g3f2 e5h2 f2e1 h2g1 e1e2 g1g2 e2e1 d6e5 c5c4 g2g1 e1e2 e5d5 a6c7 d5c4 e2f3 c2d1 e3e2 g1f1 f3e4 f1e2 e4f5 c4b4 c7e6 e2h2 e6f4 d1c2 f5g4 b4c3 g5h3 c2d1 g4h4 h2h1 h4g5 h1e1 g5f6 e1h4 f6e5 h4h6 f4d5 c3c4 h3f4 h6g7 e5e4 g7d4 e4f5 d1c2 f5e6 c4c5 e6e7 d4e5 e7f7 e5f5 f7g8 c2b3 g8g7 b3d5 f4g6 f5d3 g7f6 d3f3 f6g5 f3e3 g5f6
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MMoisan
Posts: 70
Joined: Thu Sep 13, 2012 1:42 am

Re: Chess Engine Puzzle (High Difficulty)

Post by MMoisan »

Code: Select all

New game
8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1

Analysis by Sting SF 5 64bit:

...

1.Nxe3 
  -+  (-2.54 --)   Depth: 16   00:00:06  4530kN
1.Nxe3 
  -+  (-2.66 --)   Depth: 16   00:00:06  5312kN
1.Nxe3 Ba5 2.Be2 Nb8 3.Ke7 Kg8 4.g4 Nc6+ 5.Kd6 Nd4 6.Bd3 Kf7 7.Kxc5 Nge6+ 8.Kd5 Ke7 9.Nf5+ Nxf5 10.Bxf5 c2 11.Bxc2 Kxd7 12.Bf5 
  -+  (-2.66)   Depth: 16   00:00:06  5652kN
1.Nxe3 
  -+  (-2.78 --)   Depth: 17   00:00:07  7157kN
1.Nxe3 Ba5 2.Be2 Nb8 3.Ke7 Kg8 4.Bc4+ Kg7 5.Bd3 Nf7 6.Nf5+ Kg8 7.Bc2 Nc6+ 8.Ke8 Nce5 9.Bd1 c4 10.Ke7 Bd8+ 11.Ke6 Kh7 
  -+  (-2.58)   Depth: 17   00:00:07  7547kN
1.Nxe3 
  -+  (-2.70 --)   Depth: 18   00:00:08  9125kN
1.Nxe3 
  -+  (-2.82 --)   Depth: 18   00:00:08  10682kN
1.Nxe3 Ba5 2.Be2 Nb8 3.Bd3+ Kg8 4.Bf5 Nf7+ 5.Kd5 Bc7 6.Be6 Nxd7 7.Bxd7 Bxg3 8.Nc2 Ne5 9.Be8 Kg7 10.Bb5 h5 11.Kxc5 
  -+  (-2.82)   Depth: 18   00:00:09  12268kN
1.d8Q 
  -+  (-2.70 ++)   Depth: 19   00:00:09  15132kN
1.d8Q 
  -+  (-2.58 ++)   Depth: 19   00:00:09  15319kN
1.d8Q 
  -+  (-2.40 ++)   Depth: 19   00:00:10  15660kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 e2 4.Bxe2 c4 5.Bxc4 Ba5+ 6.Ke7 Nc5 7.Ne3 Kg6 8.Kd6 Ne4+ 9.Ke5 Nxg3 10.Bd3+ Kg5 11.Nd5 h5 12.Kd4 Nf5+ 13.Ke5 
  -+  (-2.62)   Depth: 19   00:00:10  16887kN
1.d8Q 
  -+  (-2.50 ++)   Depth: 20   00:00:10  18147kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 e2 4.Bxe2 c4 5.Bxc4 Ba5+ 6.Ke7 Nc5 7.Ne3 Kg6 8.Kd6 Ne4+ 9.Kc6 Nxg3 10.Bd3+ Kg5 11.Bc2 Bd8 12.Kc5 h5 13.Nd5 
  -+  (-2.50)   Depth: 20   00:00:11  19503kN
1.d8Q 
  -+  (-2.38 ++)   Depth: 21   00:00:11  21225kN
1.d8Q 
  -+  (-2.26 ++)   Depth: 21   00:00:12  22127kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 e2 4.Bxe2 Ba5+ 5.Kd7 Nb4 6.Ne3 Kg6 7.Bd1 Bb6 8.Kd6 c4 9.Nc2 Nd3 10.Kd5 Kf6 11.Be2 Ne5 12.Ke4 Bf2 13.g4 Ke6 
  -+  (-2.38)   Depth: 21   00:00:12  24306kN
1.d8Q 
  -+  (-2.26 ++)   Depth: 22   00:00:13  27724kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 e2 4.Bxe2 Ba5+ 5.Kd7 Nb4 6.Ne3 Bb6 7.Bf3 Kg6 8.Kd6 Kg5 9.Be4 Ba7 10.Bh7 h5 11.Be4 c4 12.Nc2 Nd3 13.Kd5 
  -+  (-2.26)   Depth: 22   00:00:14  30173kN
1.d8Q 
  -+  (-2.38 --)   Depth: 23   00:00:15  33431kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Kd7 Bc7 5.Nxe3 Bxg3 6.Kc6 Nb8+ 7.Kb5 Bf2 8.Bc2+ Kg7 9.Nf5+ Kf6 10.Nxh6 Bd4 11.Nf5 Nd7 12.Kc4 Ke5 13.Kb3 Kd5 14.Ne7+ Ke5 
  -+  (-2.26)   Depth: 23   00:00:16  36879kN
1.d8Q 
  -+  (-2.34 --)   Depth: 24   00:00:18  41861kN
1.d8Q 
  -+  (-2.42 --)   Depth: 24   00:00:19  44645kN
1.d8Q 
  -+  (-2.54 --)   Depth: 24   00:00:20  48544kN
1.d8Q 
  -+  (-2.72 --)   Depth: 24   00:00:22  58191kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Kd7 Bc7 5.Nxe3 Bxg3 6.Nd5 Be5 7.Ke6 Bd4 8.Kf7 Nb4 9.Nxb4 cxb4 10.Bc2+ Kh8 11.Kg6 Kg8 12.Kxh6 Kf7 13.Kg5 Ke6 14.Kf4 Kd5 15.Bb3+ Kc6 16.Bc2 Kc5 17.Ke4 
  -+  (-2.66)   Depth: 24   00:00:24  63217kN
1.d8Q 
  -+  (-2.78 --)   Depth: 25   00:00:28  75455kN
1.d8Q 
  -+  (-2.90 --)   Depth: 25   00:00:32  89945kN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Kd7 Bc7 5.Nxe3 Bxg3 6.Nd5 Be5 7.Ke6 Bg7 8.Bc2+ Kg8 9.Ne7+ Kf8 10.Nd5 Bd4 11.Kf5 Kg7 12.Kg4 Nb8 13.Kf5 Nc6 14.Ba4 Ne5 15.Bc2 h5 16.Kg5 
  -+  (-3.03)   Depth: 25   00:00:36  104MN
1.d8Q 
  -+  (-2.90 ++)   Depth: 26   00:00:40  119MN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Bc2+ Kg8 4.Nxe3 Nc6+ 5.Kd7 Nd4 6.Bd3 Nb8+ 7.Kc7 Nbc6 8.Be4 Ne5 9.Kb6 Kg7 10.Kc7 Nf7 11.Kb6 Kf6 12.Ng4+ Kg5 13.Ne3 Ne5 14.Ka6 Ne2 15.Nf5 Nd4 
  -+  (-2.90)   Depth: 26   00:00:59  180MN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Ke7 e2 5.Bxe2 Nb4 6.Ne3 Bc7 7.Kf7 Kh8 8.Bd1 Bxg3 9.Kg6 Bf4 10.Nc2 Nd3 11.Be2 c4 12.Kf6 Be5+ 13.Kf5 Kg7 14.Bf3 Bf4 15.Bh5 Kf8 16.Ke4 
  -+  (-2.90)   Depth: 27   00:01:50  329MN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Ke8 e2 5.Bxe2 Nb4 6.Ne3 Kg7 7.Bd1 Bc7 8.Ke7 Kg6 9.g4 Kg5 10.Ke6 Bf4 11.Nc2 Nd3 12.Kd5 Nf2 13.Bf3 Nxg4 14.Kxc5 h5 15.Kd4 h4 16.Kxc3 h3 17.Kd4 h2 18.Ne1 Kf5 19.Be4+ Ke6 
  -+  (-2.90)   Depth: 28   00:02:20  437MN
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Ke7 e2 5.Bxe2 Nb4 6.Ne3 Bc7 7.Kf7 Bxg3 8.Bd1 Kh8 9.Kg6 Bf2 10.Nc2 Nd3 11.Kxh6 Nb2 12.Be2 
  -+  (-2.90)   Depth: 29   00:02:57  559MN
1.Nf6+ 
  -+  (-2.82 ++)   Depth: 30   00:03:59  737MN
1.Nf6+ 
  -+  (-2.74 ++)   Depth: 30   00:04:27  838MN
1.Nf6+ 
  -+  (-2.62 ++)   Depth: 30   00:04:29  845MN
1.Nf6+ 
  -+  (-2.44 ++)   Depth: 30   00:04:30  850MN
1.Nf6+ 
  -+  (-2.17 ++)   Depth: 30   00:04:33  861MN
1.Nf6+ 
  -+  (-1.76 ++)   Depth: 30   00:05:05  939MN
1.Nf6+ 
  -/+  (-1.15 ++)   Depth: 30   00:05:14  968MN
1.Nf6+ 
  =  (-0.23 ++)   Depth: 30   00:05:20  988MN
1.Nf6+ 
  +/-  (1.13 ++)   Depth: 30   00:05:55  1100MN
1.Nf6+ 
  +-  (3.18 ++)   Depth: 30   00:06:15  1158MN
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qf6 Kxg3 6.Qe5+ Kf2 7.Qf4+ Ke2 8.Qg4+ Ke1 9.Ke5 Kf2 10.Qf4+ Kg2 11.Qxe3 Nc7 12.Kf5 Nd5 13.Qe2+ Kg3 14.Qe5+ Kf2 15.Qxd5 Nf3 16.Ke4 Nd4 17.Kd3 Kg3 18.Qd6+ Kg4 19.Qxh6 Kf5 20.Qh7+ Ke6 21.Qg6+ Ke7 22.Kc4 
  +-  (4.96)   Depth: 30   00:07:24  1356MN
1.Nf6+ 
  +-  (5.09 ++)   Depth: 31   00:07:54  1469MN
1.Nf6+ 
  +-  (5.21 ++)   Depth: 31   00:08:10  1532MN
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Chess Engine Puzzle (High Difficulty)

Post by peter »

Hi!

24 threads, 32G hash:
8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1

Analysis by Fire 4 x64:

1.Nf6+ Kg6 2.Bh5+ Kxf6 3.d8Q+ Kg7 4.Qe7+ Kg8 5.Qxe3 c2 6.Bg6
+/- (0.72) Depth: 7 00:00:00 7kN
...
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Nf4+ Kf5 4.Nd5 Ne4+ 5.Ke7 Ba5 6.Nxe3+ Kg5 7.Nc4 Bc7 8.Bc2
-/+ (-1.36) Depth: 9 00:00:00 220kN
1.Nxe3 Ba5 2.Bc2+ Kg7 3.Nf5+ Kf6 4.Nxh6 Bc7+ 5.Kc6 Nf3 6.Ng8+ Ke6 7.Bb3+ Ke5
-/+ (-1.30) Depth: 9 00:00:00 309kN
...
1.d8Q Nf7+ 2.Ke7 Nxd8 3.Kxd8 Ba5+ 4.Kd7 e2 5.Bxe2 Nb4 6.Ne3 Bb6 7.Bd1 Kg6 8.Ke6 Ba7 9.Nc2 h5 10.Nxb4 cxb4 11.Kd5 Bf2 12.Kc4 Bxg3 13.Kxb4 Be5 14.Kb3 Kg5 15.Bf3 h4 16.Bg2 Kf4 17.Kc2 Kg3 18.Be4 h3 19.Kd3 Kf4 20.Bd5 Bf6 21.Bc6 Kg3 22.Be4 h2 23.Bc6 Be5 24.Kc2 Kg4 25.Be4 Kg5 26.Kd3 Kh4 27.Kc2 Bh8 28.Kd3 Kg3 29.Ke3
-/+ (-1.02) Depth: 21 00:00:04 28776kN
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Ba3 7.Bd1+ Kh3 8.Qxe3 Nb4+ 9.Kb5 Nd3 10.g4+ Kg2 11.Qd4 Nf2 12.Bc2 Bb2 13.Kxc4 Nf3 14.Qf4 Nh3 15.Qf6 Nf2 16.Bf5 Nd2+ 17.Kb4 Nf3 18.Qc6 Kg3 19.Qd6+ Kg2 20.Kb3 Kf1 21.Qb6 Kg2 22.Qc6 Kg3 23.Qd6+ Kg2 24.Qf4 Ng5 25.Qe3 Nf3 26.Bd7 Ng5 27.Bc6+ Kf1 28.Qd4 Ke2 29.Kc2 Ke1 30.Qe5+ Kf1 31.Bb5+
+/- (1.60) Depth: 21 00:00:40 418MN
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Bc5 7.Qe5 Kf3 8.Qf4+ Kg2 9.Qxc4 Nb4+ 10.Kxc5 Nxc2 11.Qe2+ Kxg3 12.Qxc2 Kf3 13.Qf5+ Kg2 14.Qe5 Kf2 15.Qh2+ Kf3 16.Qxh6 c2 17.Qh1+ Kf2 18.Qc1 e2 19.Qxc2 Nf3 20.Kb4 Kf1 21.Qc4 Kf2 22.Qc5+ Kf1 23.Qb5 Kf2 24.Qxe2+ Kxe2 25.Kc5 Kf2 26.Kd6 Ke2 27.Kd5 Nd4
...
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Bc5 7.Qe5 Kh3 8.Kb5 Nb4 9.Bf5+ Kg2 10.Kxc5 Nd3+ 11.Bxd3 cxd3 12.Qxe3 d2 13.Qe2+ Kh3 14.Qf1+ Kxg3 15.Qd3+ Nf3 16.Kc4 h5 17.Kxc3 h4 18.Qf1 h3 19.Kd3 h2 20.Qh1 Kf2 21.Ke4 Ng5+ 22.Kf4 Ne6+ 23.Kg4 Nd4 24.Qxh2+ Ke1 25.Qh1+ Ke2 26.Qe4+
+- (1.62) Depth: 24 00:01:30 971MN
...
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Ba3 7.Bd1+ Kh3 8.Qxe3 Nb4+ 9.Kb5 c2 10.g4+ Kh4 11.Qe1+ Kh3 12.Qc3+ Kh4 13.Bxc2 Nxc2 14.Qxc2 Bd6 15.Qxc4 Be5 16.Kc5 Kg3 17.Qe2 Bf4 18.Kd5 Kh4 19.Kd4 Kg3 20.Kd3 Bb8 21.Qd1 Bf4 22.Kd4 Nh3 23.Kc4 Nf2 24.Qe1 Kf3 25.Qf1 Kg3 26.Qg1+ Kf3 27.Qe1 Nxg4 28.Qd1+ Kg3 29.Qxg4+ Kxg4
+/- (1.58) Depth: 26 00:02:17 1569MN
...
1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Ba3 7.Bd1+ Kh3 8.Qxe3 Nb4+ 9.Kb5 c2 10.g4+ Kg2 11.Qd2+ Kg3 12.Qc3+ Kh4 13.Bxc2 Nxc2 14.Qxc2 Bd6 15.Qxc4 h5 16.Qd4 Bg3 17.Kb4 Nf3 18.Qe4 hxg4 19.Qxf3 gxf3
+/- (1.37) Depth: 26 00:03:34 2664MN
K9.2 was rather quick finding this under these conditions too at single trials but then again took some time again, especially as for showing a pv longer then just one ply to overcome the fail high.
Still waiting for that for half an hour here right now.
:)
8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1

Analysis by Komodo 9.2 64-bit:

1.Nf6+ Kg7
+/= (0.70 --) Depth: 7 00:00:00 48kN
...
1.Nf6+ Kg7
-+ (-2.09 --) Depth: 9 00:00:00 347kN
...
1.d8Q Nf7+
-+ (-2.89 --) Depth: 35 00:02:37 3582MN
1.Nf6+
-+ (-2.65 ++) Depth: 35 00:04:00 5658MN
...
1.Nf6+
+- (4.28 ++) Depth: 35 00:07:13 10250MN
Peter.
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User avatar
Kotlov
Posts: 266
Joined: Fri Jul 10, 2015 9:23 pm
Location: Russia

Re: Chess Engine Puzzle (High Difficulty)

Post by Kotlov »

http://www.chess.com/forum/view/general ... is-endgame
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Chess Engine Puzzle (High Difficulty)

Post by zullil »

peter wrote: K9.2 was rather quick finding this under these conditions too at single trials but then again took some time again, especially as for showing a pv longer then just one ply to overcome the fail high.
Still waiting for that for half an hour here right now.
:)
8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1

Analysis by Komodo 9.2 64-bit:

1.Nf6+ Kg7
+/= (0.70 --) Depth: 7 00:00:00 48kN
...
1.Nf6+ Kg7
-+ (-2.09 --) Depth: 9 00:00:00 347kN
...
1.d8Q Nf7+
-+ (-2.89 --) Depth: 35 00:02:37 3582MN
1.Nf6+
-+ (-2.65 ++) Depth: 35 00:04:00 5658MN
...
1.Nf6+
+- (4.28 ++) Depth: 35 00:07:13 10250MN
My Komodo was a bit luckier:

Code: Select all

info depth 33 time 80389 nodes 1589011097 score cp -248 lowerbound nps 19766523 hashfull 63 tbhits 0 pv g4f6
info depth 33 time 81141 nodes 1606777166 score cp -241 lowerbound nps 19802040 hashfull 63 tbhits 0 pv g4f6
info depth 33 time 81797 nodes 1621384547 score cp -231 lowerbound nps 19822053 hashfull 64 tbhits 0 pv g4f6
info depth 33 time 82278 nodes 1631638708 score cp -216 lowerbound nps 19830801 hashfull 64 tbhits 0 pv g4f6
info depth 33 time 82374 nodes 1633627596 score cp -194 lowerbound nps 19831835 hashfull 64 tbhits 0 pv g4f6
info depth 33 time 82585 nodes 1637702551 score cp -161 lowerbound nps 19830268 hashfull 64 tbhits 0 pv g4f6
info depth 33 time 82930 nodes 1644540013 score cp -112 lowerbound nps 19830220 hashfull 65 tbhits 0 pv g4f6
info depth 33 time 83160 nodes 1649111308 score cp -39 lowerbound nps 19830583 hashfull 65 tbhits 0 pv g4f6
info depth 33 time 86322 nodes 1713496728 score cp 70 lowerbound nps 19850058 hashfull 67 tbhits 0 pv g4f6
info depth 33 time 128340 nodes 2520250395 score cp 233 lowerbound nps 19637294 hashfull 100 tbhits 0 pv g4f6
info depth 33 time 239802 nodes 4784046197 score cp 476 nps 19949901 hashfull 183 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4g3 d8e8 c5c4 d6c6 b4c5 e8e5 g3g2 e5d5 g2g3 d5c4 c3c2 d1c2 g5f3 c6b7 a6b8 b7b8 c5b4 c4e2 b4d2 c2d1 f3h2 e2h5 g3g2 h5h6 g2g3 h6g5 g3f2 g5f4 f2g2 f4e4 g2g3 e4e5 g3g2 b8b7 d2c1 e5d5 g2f2 d5c4 c1d2 c4h4 f2g2 d1c2 h2f3 c2e4 d2c1 h4g4 g2f1 e4f3
info depth 34 time 239804 nodes 4784055584 nps 19949857 hashfull 183
info depth 34 time 292788 nodes 5941839851 score cp 476 nps 20294000 hashfull 221 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4h3 d8c8 h3g2 c8a6 c5c4 d6d5 c3c2 a6a2 b4d2 a2c2 c4c3 g3g4 g2f2 c2d3 g5h3 d3e2 f2g1 e2f3 g1h2 d5c4 h3g5 f3e2 h2g3 c4d3 g3h3 e2f1 h3g3 f1g1 g3h4 g1h2 g5h3 h2h1 h4g3 h1f3 g3h2 d1e2 h3g5 f3f6 h2g3 d3c2 g5h3 f6f3 g3h4 g4g5 h4g5 f3h3 g5f6 h3h6 f6e5 h6g5
info depth 35 time 292883 nodes 5943927051 nps 20294544 hashfull 221
info depth 35 time 357844 nodes 7421159959 score cp 483 lowerbound nps 20738533 hashfull 267 tbhits 0 pv g4f6
info depth 35 time 358278 nodes 7430087397 score cp 486 nps 20738329 hashfull 267 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4h3 d8c8 h3g2 c8a6 c5c4 d6d5 c3c2 a6a2 b4d2 a2c2 c4c3 g3g4 g2f2 c2d3 g5h3 d3e2 f2g1 e2f3 g1h2 d1e2 h3g5 f3f5 h2h3 d5c4 h3g2 f5f1 g2g3 c4d3 g5h3 f1f3 g3h4 f3f6 h4g3 f6d6 g3g2 d6e5 h3g1 e5e4 g2g3 e2d1 g1h3 e4f3 g3h2 d1e2 h3g5 f3f6 h2g3 f6d6 g3g2 d6e5 g5h3
info depth 36 time 358279 nodes 7430089778 nps 20738278 hashfull 267
info depth 36 time 404479 nodes 8590539256 score cp 493 lowerbound nps 21238529 hashfull 296 tbhits 0 pv g4f6
info depth 36 time 421498 nodes 9047120087 score cp 500 lowerbound nps 21464206 hashfull 306 tbhits 0 pv g4f6
info depth 36 time 452957 nodes 9899955447 score cp 510 lowerbound nps 21856280 hashfull 323 tbhits 0 pv g4f6
info depth 36 time 496023 nodes 11105839237 score cp 525 lowerbound nps 22389766 hashfull 346 tbhits 0 pv g4f6
info depth 36 time 520840 nodes 11787133611 score cp 547 lowerbound nps 22631006 hashfull 360 tbhits 0 pv g4f6
info depth 36 time 532784 nodes 12092114676 score cp 580 lowerbound nps 22696091 hashfull 367 tbhits 0 pv g4f6
info depth 36 time 535430 nodes 12158063168 score cp 585 nps 22707058 hashfull 369 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4g3 d8e8 c5c4 d6c6 g3f2 e8h5 b4f8 h5e2 f2g3 e2e3 g3g2 e3e2 g2g3 e2g4 g3f2 g4c4 a6b4 c6b5 c3c2 d1c2 b4c2 c4c2 f2g3 c2c7 g3f3 c7c3 f3e4 c3f6 f8a3 f6c6 e4f4 c6c7 f4g4 c7c4 g4h5 c4e2 h5h4 e2e3 h4g4 e3a3 g4f5 a3d6 g5f7 d6d3 f5f6 b5c5 f7g5 d3c3 f6g6 c5d5 g6f7 c3c7 f7f8 c7d8
info depth 37 time 535430 nodes 12158066746 nps 22707065 hashfull 369
info depth 37 time 558394 nodes 12756904108 score cp 585 nps 22845704 hashfull 383 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4g3 d8e8 c5c4 d6c6 g3f2 e8h5 b4f8 h5h2 f2f1 h2e2 f1g1 e2e3 g1g2 e3e2 g2g3 e2g4 g3f2 g4c4 a6b4 c6b5 c3c2 d1c2 b4c2 c4c2 f2e3 c2c3 e3e4 c3f6 f8a3 f6c6 e4f4 c6c7 f4g4 c7d7 g4f4 d7d2 f4g4 d2d4 g4h5 d4d1 h5g6 d1d3 g6g7 d3c3 g7g6 c3a3 g5h7 a3d3 g6g7 d3g3 g7f7 g3f3 f7g7 f3g4
info depth 38 time 559542 nodes 12784901923 nps 22848869 hashfull 384
info depth 38 time 568258 nodes 13001439592 score cp 585 nps 22879465 hashfull 389 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4g3 d8e8 c5c4 d6c6 g3f2 e8h5 b4f8 h5h2 f2f1 h2e2 f1g1 e2e3 g1g2 e3e2 g2g3 e2g4 g3f2 g4c4 a6b4 c6b5 c3c2 d1c2 b4c2 c4c2 f2e3 c2c3 e3e4 c3f6 f8a3 f6c6 e4f4 c6c7 f4g4 c7d7 g4f4 d7d2 f4g4 d2d4 g4h5 d4d1 h5g6 d1d3 g6g7 d3c3 g7g6 c3a3 g5h7 a3d3 g6g7 d3g3 g7f7 g3b3 f7g7 b3c3
info depth 39 time 573680 nodes 13112418784 nps 22856677 hashfull 393
info depth 39 time 670058 nodes 15574038603 score cp 592 lowerbound nps 23242821 hashfull 451 tbhits 0 pv g4f6
info depth 39 time 769650 nodes 18480864077 score cp 599 lowerbound nps 24012036 hashfull 499 tbhits 0 pv g4f6
info depth 39 time 804275 nodes 19494486005 score cp 609 lowerbound nps 24238582 hashfull 516 tbhits 0 pv g4f6
info depth 39 time 843032 nodes 20619729968 score cp 624 lowerbound nps 24458983 hashfull 534 tbhits 0 pv g4f6
info depth 39 time 854518 nodes 20946614756 score cp 641 nps 24512783 hashfull 540 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4h3 d8c8 h3g2 c8a6 c5c4 d6d5 c3c2 a6a2 b4d2 a2c2 c4c3 g3g4 g2f2 c2d3 f2g3 d3f1 g3h4 f1f5 h4g3 d1e2 g3h3 d5d4 h3g3 d4c4 c3c2 f5c2 g3f2 c2d1 d2e1 d1d3 e1d2 e2d1 f2g2 d3d5 g2g1 d5e5 d2e1 e5e3 e1f2 e3c1 g1f1 c1c3 f1g2 c3f6 f2g3 f6c6 g2f2 c6e8
info depth 40 time 854519 nodes 20946618330 nps 24512759 hashfull 540
info depth 40 time 879335 nodes 21618325994 score cp 641 nps 24584829 hashfull 553 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4h3 d8c8 h3g2 c8a6 c5c4 d6d5 c3c2 a6a2 b4d2 a2c2 c4c3 g3g4 g2f2 c2d3 f2g3 d3f1 g3h4 f1f5 h4g3 d1e2 g3h3 d5d4 h3g3 d4c4 c3c2 f5c2 g3f2 c2d1 d2e1 d1d3 e1d2 e2d1 f2g2 d3d5 g2g1 d5e5 d2e1 e5e3 e1f2 e3c1 g1f1 c1c3 f1g2 c3f6 f2g3 f6c6 g2f2 c6b6 f2g2 b6f6 g5h3 f6c6 g2g1
info depth 41 time 881481 nodes 21676070215 nps 24590513 hashfull 554
info depth 41 time 963207 nodes 24054351961 score cp 648 lowerbound nps 24973190 hashfull 592 tbhits 0 pv g4f6
info depth 41 time 980934 nodes 24594820781 score cp 655 lowerbound nps 25072859 hashfull 599 tbhits 0 pv g4f6
info depth 41 time 1004861 nodes 25356110005 score cp 665 lowerbound nps 25233450 hashfull 607 tbhits 0 pv g4f6
info depth 41 time 1014792 nodes 25648369720 score cp 680 lowerbound nps 25274509 hashfull 612 tbhits 0 pv g4f6
info depth 41 time 1315246 nodes 35412238780 score cp 1071 nps 26924422 hashfull 709 tbhits 0 pv g4f6 h7g7 f6h5 g7g6 d1c2 g6h5 d7d8q h5g4 c2d1 g4g3 d8e8 c5c4 d6c6 g3f4 e8g8 a6c5 g8b8 f4f5 b8b4 c5d3 b4c3 g5e4 c3g7 d3e5 c6d5 e4f6 d5d4 h6h5 d1c2 f5e6 d4e3 e5c6 g7g6 c6b8 g6f5 e6f7 e3d4 b8d7 f5g6 f7e7 c2f5 e7d8 f5d7 f6d7 g6g8 d8e7 g8g5 e7d6 g5d5 d6e7 d5c4 e7d8 c4d5 h5h4 d5g8 d8c7 g8g5 h4h3 g5g3 c7c6 g3h3 c6d6 h3h5
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: Chess Engine Puzzle (High Difficulty)

Post by kgburcham »

[D] 8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - -

Engine: Komodo 9 64-bit (8192 MB)
by Don Dailey, Larry Kaufman, Mark Lefler
Threads now set to 8
19.00 0:01 -1.09++ 1.Nf6+ (31.820.633) 20780
19.00 0:01 -0.76++ 1.Nf6+ (33.322.933) 20705
19.00 0:01 -0.27++ 1.Nf6+ (35.613.066) 20720
19.00 0:01 +0.46++ 1.Nf6+ (38.565.687) 20916
19.00 0:02 +1.41 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Bc5 7.Qe5 Kf3 8.Qf4+ Kg2 9.Qxc4 Nf3 10.Kb5 Nd4+ 11.Kxa6 e2 12.Qxc3 Nxc2 13.Qxc2 Kf1 14.Qd3 (43.248.592) 20968
20.00 0:02 +1.48++ 1.Nf6+ (48.776.301) 20950
20.00 0:02 +1.55++ 1.Nf6+ (52.669.967) 20936
20.00 0:02 +1.65++ 1.Nf6+ (57.081.189) 20995
20.00 0:02 +1.71 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Bc5 7.Bd1+ Kxg3 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kd5 Nb4+ 13.Kxc5 Nxc2 14.Qxc2 (60.231.674) 21064
21.00 0:03 +1.78++ 1.Nf6+ (68.248.838) 20999
21.01 0:03 +1.85++ 1.Nf6+ (76.100.320) 21083
21.01 0:03 +1.95++ 1.Nf6+ (82.826.676) 21118
21.01 0:03 +1.97 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Bc5 7.Bd1+ Kxg3 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Kf2 13.Bd1 Ng1 14.Kxa6 (84.073.236) 21100
22.01 0:05 +2.04++ 1.Nf6+ (106.374.950) 21142
22.01 0:05 +1.97-- 1.Nf6+ Kg7 (107.767.878) 21156
22.01 0:05 +1.87-- 1.Nf6+ Kg7 (108.946.604) 21257
22.01 0:05 +1.86 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Ba3 7.Bd1+ Kh3 8.Qxe3 Nb4+ 9.Kb5 c2 10.g4+ Kg2 11.Qd2+ Kg3 12.Qc3+ Kh4 13.Bxc2 Nxc2 14.Qxc2 (109.706.268) 21340
23.01 0:05 +1.86 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Qe8 c4+ 6.Kc6 Ba3 7.Bd1+ Kh3 8.Qxe3 Nb4+ 9.Kb5 c2 10.g4+ Kg2 11.Qd2+ Kg3 12.Qc3+ Kh4 13.Bxc2 Nxc2 14.Qxc2 (122.132.433) 21356
24.01 0:06 +1.79-- 1.Nf6+ Kg7 (137.579.303) 21371
24.01 0:07 +1.72-- 1.Nf6+ Kg7 (159.968.212) 21508
24.01 0:08 +1.62-- 1.Nf6+ Kg7 (190.799.307) 21612
24.01 0:10 +1.70++ 1.Nf6+ (224.565.864) 21579
24.01 0:11 +1.92++ 1.Nf6+ (253.157.456) 21573
24.01 0:14 +2.25++ 1.Nf6+ (313.795.886) 21547
24.01 0:14 +2.18 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 Bc1 12.Qf1+ Nf2 13.Qxc1 Nd7 14.Kd4 (314.058.264) 21542
25.01 0:16 +2.25++ 1.Nf6+ (364.008.155) 21530
25.01 0:18 +2.32++ 1.Nf6+ (408.316.678) 21543
25.01 0:21 +2.41 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Bd6 13.Kxa6 Bf4 14.Bd1 (459.565.445) 21610
26.01 0:21 +2.34-- 1.Nf6+ Kg7 (468.147.926) 21616
26.01 0:24 +2.41++ 1.Nf6+ (532.183.059) 21666
26.01 0:27 +2.44 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Be7 13.Kxa6 Bg5 14.Bd1 (589.668.065) 21701
27.01 0:29 +2.44 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Be7 13.Kxa6 Bg5 14.Bd1 (643.167.759) 21732
28.01 0:31 +2.45 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Be7 13.Kxa6 Bg5 14.Bd1 (693.138.722) 21766
29.01 0:41 +2.52++ 1.Nf6+ (903.601.065) 21822
29.01 0:50 +2.59++ 1.Nf6+ (1.099.148.324) 21886
29.01 0:58 +2.69++ 1.Nf6+ (1.274.324.665) 21894
29.01 1:09 +2.84++ 1.Nf6+ (1.530.280.033) 21880
29.01 1:18 +2.92 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Bd6 13.Kxa6 Bf4 14.Qf1 (1.712.687.497) 21887
30.01 1:33 +2.99++ 1.Nf6+ (2.058.816.930) 21960
30.01 1:42 +3.00 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (2.245.630.191) 22002
31.01 1:52 +3.00 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qd5+ Kg3 10.Qxc4 c2 11.Bxc2 Nf3 12.Kb7 Nb8 13.Kxb8 Be7 14.Kb7 (2.482.732.493) 22059
32.01 2:08 +3.07++ 1.Nf6+ (2.852.763.528) 22132
32.01 2:22 +3.14++ 1.Nf6+ (3.173.136.606) 22199
32.01 2:26 +3.18 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (3.256.701.184) 22222
33.01 2:41 +3.18 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (3.608.993.060) 22298
34.01 2:59 +3.18 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (4.016.261.615) 22409
35.01 4:31 +3.25++ 1.Nf6+ (6.025.719.485) 22188
35.01 5:27 +3.32++ 1.Nf6+ (7.230.622.956) 22110
35.01 6:13 +3.42++ 1.Nf6+ (8.251.779.683) 22117
35.01 7:18 +3.57++ 1.Nf6+ (9.796.429.805) 22363
35.01 7:59 +3.79++ 1.Nf6+ (10.773.358.853) 22482
35.01 9:30 +4.07 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (12.978.551.179) 22739
36.01 11:01 +4.14++ 1.Nf6+ (15.204.348.501) 22967
36.01 11:21 +4.21++ 1.Nf6+ (15.679.333.245) 23001
36.01 12:26 +4.31++ 1.Nf6+ (17.278.622.326) 23143
36.01 13:28 +4.46++ 1.Nf6+ (18.817.030.339) 23285
36.01 14:17 +4.61 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (20.066.153.541) 23389
37.01 14:51 +4.61 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Kf4 8.Qg8 Nc5 9.Qxc4+ Nge4 10.Kd5 Ba3 11.Bc2 e2 12.Qxe2 Nf6+ 13.Kd4 Ncd7 14.Qf2+ (20.929.560.423) 23468
best move: Ng4-f6 time: 15:10.532 min n/s: 23.497.669 nodes: 21.395.647.866
no chess program was born totally from one mind. all chess programs have many ideas from many minds.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Chess Engine Puzzle (High Difficulty)

Post by peter »

Hi Louis!

After some Forward-Backward:

8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1

Analysis by MF SugaR 64 POPCNT:

1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8Q Kg4 5.Bd1+ Kxg3 6.Qe8 c4+ 7.Kc6 Bc5 8.Qe5+ Kg2 9.Qf5 Bf8 10.Qg4+ Kh2 11.Qe2+ Kg3 12.Qxe3+ Kg2 13.Qe2+ Kg3 14.Kb5 Nb4 15.Qg4+ Kf2 16.Qd4+ Kg2 17.Qxc4 c2 18.Bxc2 Nxc2 19.Qxc2+ Kg3 20.Qc7+ Kf3 21.Qc6+ Kg3 22.Qf6 Ba3 23.Qc3+ Kg4 24.Qxa3 Ne6 25.Qe7 Nf4 26.Qe4 Kg5 27.Kc5 Ng6 28.Qd5+ Kf6 29.Kd6 Kg7 30.Qd4+ Kf7 31.Qc5 Kf6 32.Qf2+ Kg5 33.Kd5 h5 34.Ke4 Ne7 35.Qf7 Ng6 36.Qf5+ Kh6 37.Qf6 Kh7 38.Kf5 Nf4 39.Kxf4 Kg8 40.Qd8+ Kf7 41.Kf5
+- (#45) Depth: 60/92 00:09:26 17862MN

My longest variant backwarded was 39 moves long.

1. Nf6+ Kg7 2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8=Q Kg4 5. Bd1+ Kxg3 6. Qe8 c4+ 7. Kc6 Kf4 8. Qg8 Nc5 9. Qxc4+ Nge4 10. Kd5 Ba3 11. Bc2 e2 12. Qxe2 Nf6+ 13. Kd4 Ncd7 14. Qe3+ Kg4 15. Qe6+ Kg5 16. Kxc3 Kf4 17. Qf5+ Ke3 18. Qd3+ Kf4 19. Qd4+ Kg5 20. Kd2 Bc5 21. Qd3 Kh4 22. Qf5 Bb4+ 23. Ke2 Bc3 24. Qf2+ Kh5 25. Qf3+ Ng4 26. Qxc3 Nde5 27. Qd2 Kh4 28. Qf4 Nd7 29. Bf5 Ndf6 30. Bxg4 Nxg4 31. Kf3 h5 32. Ke4 Kh3 33. Qf1+ Kg3 34. Qg1+ Kh3 35. Kf4 h4 36. Qxg4+ Kh2 37. Kf3 h3 38. Kf2 Kh1 39. Qxh3#
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Nathanael Russell
Posts: 803
Joined: Sat Jan 31, 2015 11:50 pm
Location: Philadelphia, USA

Re: Chess Engine Puzzle (High Difficulty)

Post by Nathanael Russell »

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White to play and draw.
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