SF Dev need 150s (2.5 min) to find Qh6

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Nordlandia
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SF Dev need 150s (2.5 min) to find Qh6

Post by Nordlandia » Wed May 15, 2019 3:01 pm

As further depth require more thinking time. Qh6 ain't considered until about 2 minutes and 30s of analysis time.



Analysis by Stockfish 150519 64 BMI2:

1.Qh6 is winning.
The position is equal: = (0.18 ++) Depth: 59/48 00:02:50 3083MN, tb=31436423
15.05.2019)

i7-5960X, 4.5GHz, 7-cores used.

Michel
Posts: 2008
Joined: Sun Sep 28, 2008 11:50 pm

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by Michel » Wed May 15, 2019 3:30 pm

It appears SF misses some zugzwang.
Ideas=science. Simplification=engineering.
Without ideas there is nothing to simplify.

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Master Om
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Location: INDIA

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by Master Om » Fri May 17, 2019 5:45 pm




1. Qh6 e6 2. b4 b5 3. Kb7 Kd7 4. Qf6 {(0:00:53) 0kN}{[%eval 193,5,Lc0
v0.20.2][%meval 53s]} *
Always Expect the Unexpected

zullil
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Full name: Louis Zulli

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by zullil » Fri May 17, 2019 6:38 pm

Michel wrote:
Wed May 15, 2019 3:30 pm
It appears SF misses some zugzwang.
Sf-dev with Null Move Reduction disabled:

info depth 41 seldepth 58 multipv 1 score cp 9 lowerbound nodes 1800916083 nps 35147369 hashfull 252 tbhits 0 time 51239 pv c1h6
info depth 40 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 19 lowerbound nodes 1883230674 nps 35266492 hashfull 261 tbhits 0 time 53400 pv c1h6
info depth 39 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 33 lowerbound nodes 1916582217 nps 35328704 hashfull 267 tbhits 0 time 54250 pv c1h6
info depth 38 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 53 lowerbound nodes 1939683016 nps 35369213 hashfull 271 tbhits 0 time 54841 pv c1h6
info depth 37 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 79 lowerbound nodes 1968752988 nps 35418781 hashfull 273 tbhits 0 time 55585 pv c1h6
info depth 36 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 115 lowerbound nodes 2002675729 nps 35471328 hashfull 279 tbhits 0 time 56459 pv c1h6
info depth 35 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 162 lowerbound nodes 2040037715 nps 35533298 hashfull 286 tbhits 0 time 57412 pv c1h6
info depth 34 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 223 lowerbound nodes 2110535517 nps 35644314 hashfull 294 tbhits 0 time 59211 pv c1h6

zullil
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Full name: Louis Zulli

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by zullil » Sat May 18, 2019 2:09 am

zullil wrote:
Fri May 17, 2019 6:38 pm
Michel wrote:
Wed May 15, 2019 3:30 pm
It appears SF misses some zugzwang.
Sf-dev with Null Move Reduction disabled:

info depth 41 seldepth 58 multipv 1 score cp 9 lowerbound nodes 1800916083 nps 35147369 hashfull 252 tbhits 0 time 51239 pv c1h6
info depth 40 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 19 lowerbound nodes 1883230674 nps 35266492 hashfull 261 tbhits 0 time 53400 pv c1h6
info depth 39 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 33 lowerbound nodes 1916582217 nps 35328704 hashfull 267 tbhits 0 time 54250 pv c1h6
info depth 38 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 53 lowerbound nodes 1939683016 nps 35369213 hashfull 271 tbhits 0 time 54841 pv c1h6
info depth 37 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 79 lowerbound nodes 1968752988 nps 35418781 hashfull 273 tbhits 0 time 55585 pv c1h6
info depth 36 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 115 lowerbound nodes 2002675729 nps 35471328 hashfull 279 tbhits 0 time 56459 pv c1h6
info depth 35 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 162 lowerbound nodes 2040037715 nps 35533298 hashfull 286 tbhits 0 time 57412 pv c1h6
info depth 34 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 223 lowerbound nodes 2110535517 nps 35644314 hashfull 294 tbhits 0 time 59211 pv c1h6
Forgot to terminate the search, and returned to find this:

info depth 72 seldepth 174 multipv 1 score mate 117 nodes 1612990751169 nps 64159512 hashfull 1000 tbhits 0 time 25140321 pv c1h6 e8d8 h6g5 d8e8 g5f5 e7e6 f5f6 b6b5 b3b4 b8a7 c6c7 a7b6 c7b6 e8d7 b6b5 h7h5 b5a4 h5h4 b4b5 h4h3 f6h6 g8a8 a4b3 a8b8 b3b4 b8c8 h6h3 c8c4 b4a5 c4d4 g7g8q d4a7 a5b4 a7d4 b4b3 d4d1 b3b2 d1d2 b2a3 d2a5 a3b3 a5b5 b3c3 b5a5 c3c2 a5a2 c2d1 a2b1 d1e2 b1c2 e2f3 c2d3 f3g4 d3f5 g4h4 f5f4 h3g4 f4h2 h4g5 h2e5 g5h6 e5f6 h6h7 d5d4 g4g3 f6f5 h7g7 f5g6 g3g6 f7g6 g7g6 d7c6 g6f6 c6b5 f6e6 b5b4 g8d8 d4d3 d8d4 b4b3 d4d3 b3b4 d3e4 b4b3 e4e3 b3b4 e6d6 b4a4 e3d4 a4b3 d4d3 b3b2 d3d2 b2a3

Did a recent patch change Stockfish's maximum depth limit?

Michel
Posts: 2008
Joined: Sun Sep 28, 2008 11:50 pm

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by Michel » Sat May 18, 2019 5:35 am

zullil wrote:
Sat May 18, 2019 2:09 am
zullil wrote:
Fri May 17, 2019 6:38 pm
Michel wrote:
Wed May 15, 2019 3:30 pm
It appears SF misses some zugzwang.
Sf-dev with Null Move Reduction disabled:

info depth 41 seldepth 58 multipv 1 score cp 9 lowerbound nodes 1800916083 nps 35147369 hashfull 252 tbhits 0 time 51239 pv c1h6
info depth 40 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 19 lowerbound nodes 1883230674 nps 35266492 hashfull 261 tbhits 0 time 53400 pv c1h6
info depth 39 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 33 lowerbound nodes 1916582217 nps 35328704 hashfull 267 tbhits 0 time 54250 pv c1h6
info depth 38 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 53 lowerbound nodes 1939683016 nps 35369213 hashfull 271 tbhits 0 time 54841 pv c1h6
info depth 37 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 79 lowerbound nodes 1968752988 nps 35418781 hashfull 273 tbhits 0 time 55585 pv c1h6
info depth 36 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 115 lowerbound nodes 2002675729 nps 35471328 hashfull 279 tbhits 0 time 56459 pv c1h6
info depth 35 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 162 lowerbound nodes 2040037715 nps 35533298 hashfull 286 tbhits 0 time 57412 pv c1h6
info depth 34 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 223 lowerbound nodes 2110535517 nps 35644314 hashfull 294 tbhits 0 time 59211 pv c1h6
Forgot to terminate the search, and returned to find this:

info depth 72 seldepth 174 multipv 1 score mate 117 nodes 1612990751169 nps 64159512 hashfull 1000 tbhits 0 time 25140321 pv c1h6 e8d8 h6g5 d8e8 g5f5 e7e6 f5f6 b6b5 b3b4 b8a7 c6c7 a7b6 c7b6 e8d7 b6b5 h7h5 b5a4 h5h4 b4b5 h4h3 f6h6 g8a8 a4b3 a8b8 b3b4 b8c8 h6h3 c8c4 b4a5 c4d4 g7g8q d4a7 a5b4 a7d4 b4b3 d4d1 b3b2 d1d2 b2a3 d2a5 a3b3 a5b5 b3c3 b5a5 c3c2 a5a2 c2d1 a2b1 d1e2 b1c2 e2f3 c2d3 f3g4 d3f5 g4h4 f5f4 h3g4 f4h2 h4g5 h2e5 g5h6 e5f6 h6h7 d5d4 g4g3 f6f5 h7g7 f5g6 g3g6 f7g6 g7g6 d7c6 g6f6 c6b5 f6e6 b5b4 g8d8 d4d3 d8d4 b4b3 d4d3 b3b4 d3e4 b4b3 e4e3 b3b4 e6d6 b4a4 e3d4 a4b3 d4d3 b3b2 d3d2 b2a3

Did a recent patch change Stockfish's maximum depth limit?
Yes. It is now an unsigned int8 (before it was signed).
Ideas=science. Simplification=engineering.
Without ideas there is nothing to simplify.

Dann Corbit
Posts: 9767
Joined: Wed Mar 08, 2006 7:57 pm
Location: Redmond, WA USA
Contact:

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by Dann Corbit » Sat May 18, 2019 7:40 am

You have an eye for interesting problems. Please keep it up. I guess that I am not the only one who enjoys them.
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.

acase
Posts: 680
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Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by acase » Sun May 19, 2019 1:53 am

Nordlandia wrote:
Wed May 15, 2019 3:01 pm
As further depth require more thinking time. Qh6 ain't considered until about 2 minutes and 30s of analysis time.



Analysis by Stockfish 150519 64 BMI2:

1.Qh6 is winning.
The position is equal: = (0.18 ++) Depth: 59/48 00:02:50 3083MN, tb=31436423
15.05.2019)

i7-5960X, 4.5GHz, 7-cores used.
Takes almost 1 minute on my computer with the latest development version of Stockfish with default settings.


Code: Select all

New game
1b2k1q1/4ppPp/1pK5/3pP3/3P4/1P6/8/2Q5 w - - 0 1

Analysis by Stockfish 170519 64 BMI2:

1.Kb7 f6 2.Kxb8 Kf7+ 3.Kc7 fxe5 4.Qc6 e6 5.Kxb6 Qd8+ 6.Kb5 Qe7 7.dxe5 Kxg7 8.Qc3 Qb7+ 9.Ka4 Qa6+ 10.Kb4 Qb6+ 11.Ka4 Kg6 12.Qd3+ Kg5 
  -/+ (-1.38)  Depth: 13/31   00:00:00  899kN
1.Kb7 f5 2.Kxb8 Kf7+ 3.Kc7 Qxg7 4.Qc6 Qg6 5.Qxd5+ Qe6 6.Qh1 h6 7.Qf1 Ke8 8.Qc4 
  -/+ (-1.00)  Depth: 14/31   00:00:00  1180kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.Qg4+ Kf7 7.Qd7+ 
  = (0.00)  Depth: 15/31   00:00:00  2204kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.Qg4+ Kf7 7.Qd7+ 
  = (0.00)  Depth: 16/31   00:00:00  2412kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.e7 Qb8+ 8.Ka6 Qa8+ 9.Kb5 Qa5+ 10.Kc6 Qa8+ 
  = (0.00)  Depth: 17/31   00:00:00  2560kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.Kxb6 Bg1+ 8.Kc6 Qa8+ 9.Kb5 Qb8+ 10.Ka4 Qa8+ 
  = (0.00)  Depth: 18/31   00:00:00  2973kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.e7 Qb8+ 8.Kc6 Qa8+ 9.Kxb6 Qb8+ 10.Kc6 Qa8+ 
  = (0.00)  Depth: 19/31   00:00:00  3027kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.e7 Qb8+ 8.Kc6 Qa8+ 9.Kxb6 Qb8+ 10.Kc6 Qa8+ 
  = (0.00)  Depth: 20/31   00:00:00  3339kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bg3 7.e7 Qb8+ 8.Ka6 Qa8+ 9.Kb5 Qa5+ 10.Kc6 Qa8+ 11.Kxb6 Bf2+ 12.Kb5 Qb8+ 13.Ka4 Qa8+ 
  = (0.00)  Depth: 21/42   00:00:00  3930kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bg3 7.e7 Qb8+ 8.Ka6 Qa8+ 9.Kb5 Qa5+ 10.Kc6 Qa8+ 11.Kxb6 Bf2+ 12.Kb5 Qb8+ 13.Ka4 Qa8+ 
  = (0.00)  Depth: 22/42   00:00:00  4854kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 13.Kb5 Qb8+ 
  = (0.00)  Depth: 23/42   00:00:00  6066kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 13.Kc7 Qd8+ 14.Kc6 
  = (0.00)  Depth: 24/42   00:00:00  10145kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kc7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 13.Kb6 
  = (0.00)  Depth: 25/49   00:00:00  11293kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 
  = (0.00)  Depth: 26/25   00:00:00  15325kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qxd5 f2 10.Qg8+ Qf8 11.Qe6+ Qe7 
  = (0.00)  Depth: 27/23   00:00:01  18710kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Kc7 Qf7+ 7.Kc6 Qxf6 8.g8Q+ Qf8 9.Qxe6+ Qe7 10.Qc8+ Qd8 11.Qe6+ 
  = (0.00)  Depth: 28/22   00:00:01  20194kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Kc7 Qf7+ 7.Kc8 Qxf6 8.g8Q+ Qf8 9.Qxe6+ Qe7 10.Qg8+ Qf8 
  = (0.00)  Depth: 29/27   00:00:01  24186kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qxh5 Qc7+ 11.Ka8 Qc8+ 12.Ka7 Qc7+ 
  = (0.00)  Depth: 30/38   00:00:01  31286kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qh7 Qxb5 12.Qxh5 Qc6 13.Qh8+ Qe8 14.Qg7 Qc6 
  = (0.00)  Depth: 31/38   00:00:01  40342kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 32/38   00:00:01  44412kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 33/38   00:00:01  55608kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 34/38   00:00:02  61192kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 35/38   00:00:02  67024kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 36/38   00:00:02  82216kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 37/37   00:00:03  97512kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 38/45   00:00:03  127MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 39/37   00:00:04  169MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 40/37   00:00:05  179MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Kb6 
  = (0.00)  Depth: 41/38   00:00:06  224MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg7 Qe7 12.Qh8+ Qe8 
  = (0.00)  Depth: 42/25   00:00:08  305MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 43/38   00:00:10  379MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 44/31   00:00:17  661MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 45/37   00:00:18  698MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 46/37   00:00:20  754MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Kd7 13.Qh3 Qd8+ 14.Kb7 Qc8+ 15.Ka7 Qc7+ 16.Ka6 Qc8+ 17.Kxb6 Qb8+ 18.Ka6 Qa8+ 19.Kb6 
  = (0.00)  Depth: 47/38   00:00:27  1046MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 48/37   00:00:32  1222MN
1.Qh6 
  = (0.09 ++)  Depth: 49/66   00:00:59  2262MN
1.Qh6 
  = (0.19 ++)  Depth: 49/66   00:01:01  2335MN
1.Qh6 
  +/= (0.33 ++)  Depth: 49/67   00:01:03  2394MN
1.Qh6 
  +/= (0.53 ++)  Depth: 49/69   00:01:04  2443MN
1.Qh6 
  +/- (0.79 ++)  Depth: 49/69   00:01:06  2515MN
1.Qh6 
  +/- (1.15 ++)  Depth: 49/69   00:01:07  2572MN
1.Qh6 
  +- (1.62 ++)  Depth: 49/69   00:01:09  2632MN
1.Qh6 
  +- (2.23 ++)  Depth: 49/69   00:01:11  2717MN
1.Qh6 
  +- (3.01 ++)  Depth: 49/69   00:01:13  2799MN
1.Qh6 
  +- (4.01 ++)  Depth: 49/69   00:01:16  2906MN
1.Qh6 
  +- (5.29 ++)  Depth: 49/73   00:01:18  2986MN
1.Qh6 
  +- (6.90 ++)  Depth: 49/154   00:01:21  3114MN
1.Qh6 Kd8 2.Qg5 Ke8 3.Qf5 e6 4.Qf6 h5 5.Qh6 f5 6.Qxh5+ Ke7 7.Qh4+ Ke8 8.Qh6 f4 9.Qg6+ Ke7 10.Qf6+ Ke8 11.Kb7 Ba7 12.Kxa7 Qf7+ 13.Kb8 Qxf6 14.g8Q+ Qf8 15.Qxe6+ Qe7 16.Qg8+ Qf8 17.Qxd5 Qf5 18.Qc6+ Kf7 19.Qc7+ Kg6 20.Qd6+ Kg7 21.e6 Qf8+ 22.Kc7 Qxd6+ 23.Kxd6 f3 24.d5 f2 25.e7 f1Q 26.e8Q Qa6 27.Kc7 Qa7+ 28.Kc6 Qa6 29.Qe7+ Kg6 30.Qe6+ Kg5 31.d6 b5+ 32.Kc5 b4 33.Qe5+ Kg4 34.d7 Qa5+ 35.Kd6 Qd8 36.Qe7 Qb6+ 37.Kd5 Qb7+ 38.Ke6 Qe4+ 39.Kd6 
  +- (8.08)  Depth: 49/154   00:01:46  4185MN

MikeB
Posts: 3139
Joined: Thu Mar 09, 2006 5:34 am
Location: Pen Argyl, Pennsylvania

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by MikeB » Sun May 19, 2019 2:56 am

acase wrote:
Sun May 19, 2019 1:53 am
Nordlandia wrote:
Wed May 15, 2019 3:01 pm
As further depth require more thinking time. Qh6 ain't considered until about 2 minutes and 30s of analysis time.



Analysis by Stockfish 150519 64 BMI2:

1.Qh6 is winning.
The position is equal: = (0.18 ++) Depth: 59/48 00:02:50 3083MN, tb=31436423
15.05.2019)

i7-5960X, 4.5GHz, 7-cores used.
Takes almost 1 minute on my computer with the latest development version of Stockfish with default settings.


Code: Select all

New game
1b2k1q1/4ppPp/1pK5/3pP3/3P4/1P6/8/2Q5 w - - 0 1

Analysis by Stockfish 170519 64 BMI2:

1.Kb7 f6 2.Kxb8 Kf7+ 3.Kc7 fxe5 4.Qc6 e6 5.Kxb6 Qd8+ 6.Kb5 Qe7 7.dxe5 Kxg7 8.Qc3 Qb7+ 9.Ka4 Qa6+ 10.Kb4 Qb6+ 11.Ka4 Kg6 12.Qd3+ Kg5 
  -/+ (-1.38)  Depth: 13/31   00:00:00  899kN
1.Kb7 f5 2.Kxb8 Kf7+ 3.Kc7 Qxg7 4.Qc6 Qg6 5.Qxd5+ Qe6 6.Qh1 h6 7.Qf1 Ke8 8.Qc4 
  -/+ (-1.00)  Depth: 14/31   00:00:00  1180kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.Qg4+ Kf7 7.Qd7+ 
  = (0.00)  Depth: 15/31   00:00:00  2204kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.Qg4+ Kf7 7.Qd7+ 
  = (0.00)  Depth: 16/31   00:00:00  2412kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.e7 Qb8+ 8.Ka6 Qa8+ 9.Kb5 Qa5+ 10.Kc6 Qa8+ 
  = (0.00)  Depth: 17/31   00:00:00  2560kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.Kxb6 Bg1+ 8.Kc6 Qa8+ 9.Kb5 Qb8+ 10.Ka4 Qa8+ 
  = (0.00)  Depth: 18/31   00:00:00  2973kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.e7 Qb8+ 8.Kc6 Qa8+ 9.Kxb6 Qb8+ 10.Kc6 Qa8+ 
  = (0.00)  Depth: 19/31   00:00:00  3027kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bh2 7.e7 Qb8+ 8.Kc6 Qa8+ 9.Kxb6 Qb8+ 10.Kc6 Qa8+ 
  = (0.00)  Depth: 20/31   00:00:00  3339kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bg3 7.e7 Qb8+ 8.Ka6 Qa8+ 9.Kb5 Qa5+ 10.Kc6 Qa8+ 11.Kxb6 Bf2+ 12.Kb5 Qb8+ 13.Ka4 Qa8+ 
  = (0.00)  Depth: 21/42   00:00:00  3930kN
1.Kb7 f6 2.Qc6+ Kf7 3.Qxd5+ e6 4.Qd7+ Kg6 5.d5 exd5 6.e6 Bg3 7.e7 Qb8+ 8.Ka6 Qa8+ 9.Kb5 Qa5+ 10.Kc6 Qa8+ 11.Kxb6 Bf2+ 12.Kb5 Qb8+ 13.Ka4 Qa8+ 
  = (0.00)  Depth: 22/42   00:00:00  4854kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 13.Kb5 Qb8+ 
  = (0.00)  Depth: 23/42   00:00:00  6066kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 13.Kc7 Qd8+ 14.Kc6 
  = (0.00)  Depth: 24/42   00:00:00  10145kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kc7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 13.Kb6 
  = (0.00)  Depth: 25/49   00:00:00  11293kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qc8+ Qd8 10.Qf5 Qa8+ 11.Kxb6 Qb8+ 12.Kc6 Qa8+ 
  = (0.00)  Depth: 26/25   00:00:00  15325kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.Kb7 Qf7+ 6.Kc6 Qxf6 7.g8Q+ Qf8 8.Qxe6+ Qe7 9.Qxd5 f2 10.Qg8+ Qf8 11.Qe6+ Qe7 
  = (0.00)  Depth: 27/23   00:00:01  18710kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Kc7 Qf7+ 7.Kc6 Qxf6 8.g8Q+ Qf8 9.Qxe6+ Qe7 10.Qc8+ Qd8 11.Qe6+ 
  = (0.00)  Depth: 28/22   00:00:01  20194kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Kc7 Qf7+ 7.Kc8 Qxf6 8.g8Q+ Qf8 9.Qxe6+ Qe7 10.Qg8+ Qf8 
  = (0.00)  Depth: 29/27   00:00:01  24186kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qxh5 Qc7+ 11.Ka8 Qc8+ 12.Ka7 Qc7+ 
  = (0.00)  Depth: 30/38   00:00:01  31286kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qh7 Qxb5 12.Qxh5 Qc6 13.Qh8+ Qe8 14.Qg7 Qc6 
  = (0.00)  Depth: 31/38   00:00:01  40342kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 32/38   00:00:01  44412kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 33/38   00:00:01  55608kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 34/38   00:00:02  61192kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 35/38   00:00:02  67024kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 36/38   00:00:02  82216kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 37/37   00:00:03  97512kN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 38/45   00:00:03  127MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 39/37   00:00:04  169MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 40/37   00:00:05  179MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Kb6 
  = (0.00)  Depth: 41/38   00:00:06  224MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg7 Qe7 12.Qh8+ Qe8 
  = (0.00)  Depth: 42/25   00:00:08  305MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 43/38   00:00:10  379MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 44/31   00:00:17  661MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 45/37   00:00:18  698MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 15.Ka6 Qc8+ 16.Kxb6 Qc7+ 17.Ka6 Qc8+ 18.Ka5 Qc3+ 19.Ka6 
  = (0.00)  Depth: 46/37   00:00:20  754MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Kd7 13.Qh3 Qd8+ 14.Kb7 Qc8+ 15.Ka7 Qc7+ 16.Ka6 Qc8+ 17.Kxb6 Qb8+ 18.Ka6 Qa8+ 19.Kb6 
  = (0.00)  Depth: 47/38   00:00:27  1046MN
1.Kb7 f5 2.Qh6 e6 3.Qf6 f4 4.Kxb8 f3 5.b4 f2 6.Qxf2 Qxg7 7.b5 Qe7 8.Qc2 h5 9.Qg6+ Kd8 10.Qg8+ Qe8 11.Qg5+ Qe7 12.Qxh5 Qc7+ 13.Ka8 Qc8+ 14.Ka7 Qc7+ 
  = (0.00)  Depth: 48/37   00:00:32  1222MN
1.Qh6 
  = (0.09 ++)  Depth: 49/66   00:00:59  2262MN
1.Qh6 
  = (0.19 ++)  Depth: 49/66   00:01:01  2335MN
1.Qh6 
  +/= (0.33 ++)  Depth: 49/67   00:01:03  2394MN
1.Qh6 
  +/= (0.53 ++)  Depth: 49/69   00:01:04  2443MN
1.Qh6 
  +/- (0.79 ++)  Depth: 49/69   00:01:06  2515MN
1.Qh6 
  +/- (1.15 ++)  Depth: 49/69   00:01:07  2572MN
1.Qh6 
  +- (1.62 ++)  Depth: 49/69   00:01:09  2632MN
1.Qh6 
  +- (2.23 ++)  Depth: 49/69   00:01:11  2717MN
1.Qh6 
  +- (3.01 ++)  Depth: 49/69   00:01:13  2799MN
1.Qh6 
  +- (4.01 ++)  Depth: 49/69   00:01:16  2906MN
1.Qh6 
  +- (5.29 ++)  Depth: 49/73   00:01:18  2986MN
1.Qh6 
  +- (6.90 ++)  Depth: 49/154   00:01:21  3114MN
1.Qh6 Kd8 2.Qg5 Ke8 3.Qf5 e6 4.Qf6 h5 5.Qh6 f5 6.Qxh5+ Ke7 7.Qh4+ Ke8 8.Qh6 f4 9.Qg6+ Ke7 10.Qf6+ Ke8 11.Kb7 Ba7 12.Kxa7 Qf7+ 13.Kb8 Qxf6 14.g8Q+ Qf8 15.Qxe6+ Qe7 16.Qg8+ Qf8 17.Qxd5 Qf5 18.Qc6+ Kf7 19.Qc7+ Kg6 20.Qd6+ Kg7 21.e6 Qf8+ 22.Kc7 Qxd6+ 23.Kxd6 f3 24.d5 f2 25.e7 f1Q 26.e8Q Qa6 27.Kc7 Qa7+ 28.Kc6 Qa6 29.Qe7+ Kg6 30.Qe6+ Kg5 31.d6 b5+ 32.Kc5 b4 33.Qe5+ Kg4 34.d7 Qa5+ 35.Kd6 Qd8 36.Qe7 Qb6+ 37.Kd5 Qb7+ 38.Ke6 Qe4+ 39.Kd6 
  +- (8.08)  Depth: 49/154   00:01:46  4185MN
I guess some people might be interested in looking at "Honey" when I get around to releasing it. New SF derivative based on SF, Sugar 1.6.1 and McCain with a little bit of corchess thrown in as well. The run below was exceptionally fast . Out of 10 runs using 23 threads using 12 cores (8192M hash), twice it took over 10 seconds , with 14 seconds being the longest, twice it was under 1 second , similar to below and the other 6 runs were about 3 to 4 seconds. Single core/thread (256M hash ) with avg of 1.76M nps, it took 2:41 and 283M searched nodes.

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 38	+13.06 	3.96G	1:59.92	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 b5 b4 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qe2 Kf8 Qf1+ Ke7 Qxb5 Qh8+ Kc7 Qd8+ Kb7 Kf7 Qc6 Qg8 b5 Qg4 Qc5 Qg3 b6 Kg6 Kc6 Qb3 b7 Kg5 Qe7+ Kg4 Qg7+ Kf3 Qf8+ Ke4 b8=Q 
 38	+11.99!	3.31G	1:40.89	Qh6! 
 38	+10.88!	2.89G	1:28.54	Qh6! 
 38	+9.63!	2.63G	1:20.82	Qh6! 
 38	+9.26?	2.20G	1:08.14	Qh6 Kd8? 
 37	+9.31 	2.08G	1:04.54	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 b5 b4 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qe2 Kf7 Qf1+ Ke7 Qxb5 Qf8+ Kc7 Qd8+ Kb7 Kf7 Qc6 Qh4 Qd7+ Kf8 b5 Qg4 Qd6+ Kg7 Qc5 Kh6 b6 Qh5 Kc6 Qe8+ Kd6 Qf8+ Kxe6 Qg8+ Kd 
 37	+8.59!	1.77G	0:54.66	Qh6! 
 37	+8.26?	1.62G	0:50.05	Qh6 Kd8? 
 36	+8.31 	1.40G	0:43.66	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 b5 b4 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qe2 Qh8 Qxb5+ Kf7+ Kc7 Kg6 Qd3+ Kg7 Qg3+ Kf7 Qf2+ Kg8 Qg2+ Kf8 Qg6 Qh3 Qf6+ Kg8 b5 Qc3+ Kb7 Qh3 b6 Kh7 Qe7+ Kg6 Kc7 Qc3+ Q 
 35	+8.00 	1.04G	0:32.70	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg4 Kc7 Ke7 Kxb6 Kf7 b4 Kg6 b5 Qg5 Ka6 Qd8 b6 Qa8+ Kb5 Kf5 Qc7 Qe8+ Qc6 Qf8 Qc2+ Kg4 b7 Qe8+ Kb6 Qf8 Qg6+ Kh3 Kc6 Kh4 Qxe6 Q 
 35	+7.98!	899.0M	0:28.52	Qh6! 
 34	+7.43 	760.8M	0:24.32	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg4 Kc7 Kf7 Kd6 Qg5 Qc7+ Kg6 Qe7 Qf4 Qxe6+ Kh5 Qxd5 Kh4 Kc6 Qf8 Qd7 Qa8+ Kxb6 Qb8+ Qb7 Qf8 e6 Qf6 Qh7+ Kg3 Qc7+ Kg4 Qd7 Kg5 
 33	+7.35 	633.2M	0:20.40	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg4 Kc7 Ke7 Kxb6 Kf7 b4 Kg6 b5 Qf5 Kc6 Qf8 Qd3+ Kh6 Qh3+ Kg5 Qxe6 Qa8+ Kc5 Kf4 Qxd5 Qa3+ Kb6 Ke3 Qd6 Qd3 
 33	+6.83!	550.5M	0:17.88	Qh6! 
 33	+6.05?	543.9M	0:17.69	Qh6 b5? 
 33	+7.02!	492.8M	0:16.18	Qh6! 
 33	+6.56!	426.4M	0:14.13	Qh6! 
 32	+6.10 	327.4M	0:10.78	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 b5 b4 h6 Qxh6 f5 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qe2 Qf8 Qxb5+ Kf7+ Kc7 Kg6 Qd3+ Kg5 Qg3+ Kh5 Qh3+ Kg5 Qxe6 Qa8 b5 Qa7+ Kc6 Qa8+ Kc5 Qa3+ Kb6 Qa8 Qc6 Qb8+ Kc5 Kf4 e6 Ke4 Qxd5+ Kd3 e7 Qc8+  
 31	+5.69 	284.0M	0:09.44	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg4 Kc7 Ke7 Kxb6 Kf7 b4 Kg6 b5 Qf5 Kc6 Qf8 Qg3+ Kh7 Qh3+ Kg7 Qg4+ Kh7 Qxe6 Qa8+ Kc5 Qa5 Qf7+ Kh6 Qf6+ Kh5 Kxd5 Qc7 
 31	+5.43!	257.8M	0:08.63	Qh6! 
 31	+4.75?	252.0M	0:08.44	Qh6 b5? 
 31	+5.49!	241.3M	0:08.10	Qh6! 
 31	+5.01!	193.4M	0:06.57	Qh6! 
 31	+4.80?	190.3M	0:06.47	Qh6 e6? 
 30	+4.85 	171.5M	0:05.86	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 b5 b4 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qe2 Kd8 Qc2 Qg1 Qc8+ Ke7 Qb7+ Kd8 Qb6+ Ke7 Qd6+ Kf7 Qd7+ Kf8 Qxb5 Qh2 Qc5+ Kg7 Kc7 Kg6 b5 Qh7+ Kd6 Qb7 b6 Kf5 Qc2+ Kf4 Qc 
 30	+4.66!	159.1M	0:05.44	Qh6! 
 29	+4.32 	131.3M	0:04.53	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Kf7 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg4 Kc7 Kf7 Kd6 Qh4 Qc7+ Kg6 Qd7 Kf5 Qxe6+ Ke4 Qxd5+ Kd3 Kc6 Qh8 Qd6 Qh1+ Kxb6 Qh2 Qd7 Qh6+ e6 
 29	+4.10!	122.0M	0:04.23	Qh6! 
 29	+3.81!	112.8M	0:03.93	Qh6! 
 28	+3.53 	98.7M  	0:03.46	Qh6 e6 Qf6 h6 Qxh6 f5 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg4 Kc7 Ke7 Kxb6 Kf7 b4 Qe2 Qc5 Kg6 b5 Kf5 Kc7 Qh5 b6 Qf7+ Kd6 Qb7 Qc2+ Kg5 
 28	+3.46!	91.7M  	0:03.22	Qh6! 
 28	+3.22!	85.4M  	0:03.00	Qh6! 
 27	+2.97 	73.8M  	0:02.61	Qh6 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qh6 Qc6+ Kf8 Kc7 Qh7+ Kxb6 Qb1 Qd6+ Kf7 Qd7+ Kf8 Qd8+ Kg7 Qe7+ Kh8 b4 Qe4 Qc5 Kh7 
 26	+2.50 	60.3M  	0:02.15	Qh6 b5 b4 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h6 Qxh6 f5 Qg6+ Kd8 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qe2 Kd8 Qc2 Qg4 Qc5 Qg7 Qc8+ Ke7 Qb7+ Kf8 Qxb5 Qe7 Qc5 
 25	+1.68 	39.0M  	0:01.42	Qh6 b5 b4 Kd8 Qh3 e6 Qh4+ Ke8 Qf6 h5 Qh6 f5 Qxh5+ Ke7 Qg5+ Ke8 Qg6+ Ke7 Qf6+ Ke8 Kb7 f4 Kxb8 f3 Qxf3 Qxg7 Qc3 Qg1 Qc5 Kf7 Qxb5 Kg6 Qc5 Kf5 b5 Ke4 b6 
 24	+0.89 	28.1M  	0:01.04	Qh6 Kd8 Qg5 b5 Kb7 Ke8 Kxb8 Kd7+ Ka7 Ke6 Kb6 f6 Qg4+ f5 Qg5 Kf7 Qxf5+ Kxg7 Qd7 Qf7 e6 Qf8 Kxb5 Kf6 b4 Qb8+ Ka4 Qg3 Qxd5 
 23	+0.43 	22.3M  	0:00.83	Qh6 b5 Kb7 e6 Kxb8 Kd7+ Ka7 b4 Qg5 h6 Qg1 h5 Ka6 h4 Ka5 h3 Qg5 h2 Qh6 h1=Q Qxh1 Qxg7 Qf1 Ke7 
 22	  0.00 	14.5M  	0:00.56	Qh6 f6 Qh5+ Kd8 Qf5 Ke8 Qh5+ 
 21	  0.00 	10.2M  	0:00.40	Kb7 f6 Qc6+ Kf7 Qxd5+ Kxg7 exf6+ Kh8 Qxg8+ Kxg8 fxe7 Kf7 Kxb8 Kxe7 
 20	  0.00 	4.80M  	0:00.19	Kb7 f6 Qc6+ Kf7 Qxd5+ Kxg7 exf6+ Kh8 Qxg8+ Kxg8 fxe7 Kf7 Kxb8 Kxe7 
 19	  0.00 	3.99M  	0:00.15	Kb7 f6 Qc6+ Kf7 Qxd5+ e6 Qd7+ Kg6 d5 exd5 e6 Bg3 e7 Qb8+ Kc6 Qa8+ Kxb6 Bf2+ Kb5 Qb8+ Ka4 Qa8+ 
 18	  0.00 	3.34M  	0:00.13	Kb7 f6 Qc6+ Kf7 Qxd5+ Kxg7 exf6+ Kh8 Qxg8+ Kxg8 fxe7 Kf7 Kxb8 Kxe7 
 17	  0.00 	2.72M  	0:00.10	Kb7 f6 Qc6+ Kf7 Qxd5+ Kxg7 exf6+ Kh8 Qxg8+ Kxg8 fxe7 Kf7 Kxb8 Kxe7 
 16	  0.00 	2.51M  	0:00.10	Kb7 f6 Qc6+ Kf7 Qxd5+ Kxg7 exf6+ Kh8 Qxg8+ Kxg8 fxe7 Kf7 Kxb8 Kxe7 
 15	  0.00 	2.50M  	0:00.09	Kb7 f6 Qc6+ Kf7 Qxd5+ e6 Qd7+ Kg6 d5 exd5 Qg4+ Kf7 Qd7+ 
 14	  0.00 	2.18M  	0:00.08	Kb7 f6 Qc6+ Kf7 Qxd5+ Kxg7 exf6+ exf6 Qxg8+ Kxg8 Kxb8 h5 d5 
 13	 -0.84 	1.73M  	0:00.07	Kb7 f5 Qc8+ Kf7 Qxf5+ Kxg7 Qg5+ Kf8 Qf4+ Ke8 Kxb8 Qg6 Kb7 b5 
 12	 -1.15 	1.03M  	0:00.04	Kb7 f6 Kxb8 Kf7+ Kb7 fxe5 dxe5 Qxg7 Qf1+ Kg8 e6 Qg6 Qe1 d4 Qh4 
 11	 -1.01 	621409	0:00.03	Kb7 f6 Kxb8 Kf7+ Kb7 Qxg7 exf6 Qxf6 Qh1 Qf5 Kxb6 h5 Kc5 Kf6 Qh2 Ke6 
 10	 -1.01 	252248	0:00.01	Kb7 f5 Kxb8 Kf7+ Kc7 e6 b4 b5 Qc6 Kxg7 Qxb5 
  9	 -1.03 	109699	0:00.01	Kb7 f6 Kxb8 Kf7+ Kb7 fxe5 dxe5 Qxg7 e6+ Kf6 Qc6 Qg2 
  8	 -1.01 	67530  	0:00.00	Kb7 f6 Kxb8 Kf7+ Kb7 fxe5 dxe5 
  7	 -1.08 	51364  	0:00.00	Kb7 f6 Kxb8 Kf7+ Kb7 fxe5 
  6	 -1.28 	25543  	0:00.00	Kb7 f6 Kxb8 Kf7+ Kc7 fxe5 Qf1+ Kxg7 
  5	 -0.93 	14346  	0:00.00	Kb7 
  4	 -1.58 	9493    	0:00.00	Qg5 Ba7 Qg2 e6 
  3	 -1.51 	5577    	0:00.00	Kb5 f6 exf6 
  2	 -1.41 	1607    	0:00.00	Qg5 e6 
  1	 -1.70 	1214    	0:00.00	Qg5 
  1	Found 1511 tablebases 

Uri Blass
Posts: 8428
Joined: Wed Mar 08, 2006 11:37 pm
Location: Tel-Aviv Israel

Re: SF Dev need 150s (2.5 min) to find Qh6

Post by Uri Blass » Sun May 19, 2019 7:13 am

Michel wrote:
Sat May 18, 2019 5:35 am
zullil wrote:
Sat May 18, 2019 2:09 am
zullil wrote:
Fri May 17, 2019 6:38 pm
Michel wrote:
Wed May 15, 2019 3:30 pm
It appears SF misses some zugzwang.
Sf-dev with Null Move Reduction disabled:

info depth 41 seldepth 58 multipv 1 score cp 9 lowerbound nodes 1800916083 nps 35147369 hashfull 252 tbhits 0 time 51239 pv c1h6
info depth 40 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 19 lowerbound nodes 1883230674 nps 35266492 hashfull 261 tbhits 0 time 53400 pv c1h6
info depth 39 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 33 lowerbound nodes 1916582217 nps 35328704 hashfull 267 tbhits 0 time 54250 pv c1h6
info depth 38 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 53 lowerbound nodes 1939683016 nps 35369213 hashfull 271 tbhits 0 time 54841 pv c1h6
info depth 37 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 79 lowerbound nodes 1968752988 nps 35418781 hashfull 273 tbhits 0 time 55585 pv c1h6
info depth 36 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 115 lowerbound nodes 2002675729 nps 35471328 hashfull 279 tbhits 0 time 56459 pv c1h6
info depth 35 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 162 lowerbound nodes 2040037715 nps 35533298 hashfull 286 tbhits 0 time 57412 pv c1h6
info depth 34 currmove c1h6 currmovenumber 1
info depth 41 seldepth 58 multipv 1 score cp 223 lowerbound nodes 2110535517 nps 35644314 hashfull 294 tbhits 0 time 59211 pv c1h6
Forgot to terminate the search, and returned to find this:

info depth 72 seldepth 174 multipv 1 score mate 117 nodes 1612990751169 nps 64159512 hashfull 1000 tbhits 0 time 25140321 pv c1h6 e8d8 h6g5 d8e8 g5f5 e7e6 f5f6 b6b5 b3b4 b8a7 c6c7 a7b6 c7b6 e8d7 b6b5 h7h5 b5a4 h5h4 b4b5 h4h3 f6h6 g8a8 a4b3 a8b8 b3b4 b8c8 h6h3 c8c4 b4a5 c4d4 g7g8q d4a7 a5b4 a7d4 b4b3 d4d1 b3b2 d1d2 b2a3 d2a5 a3b3 a5b5 b3c3 b5a5 c3c2 a5a2 c2d1 a2b1 d1e2 b1c2 e2f3 c2d3 f3g4 d3f5 g4h4 f5f4 h3g4 f4h2 h4g5 h2e5 g5h6 e5f6 h6h7 d5d4 g4g3 f6f5 h7g7 f5g6 g3g6 f7g6 g7g6 d7c6 g6f6 c6b5 f6e6 b5b4 g8d8 d4d3 d8d4 b4b3 d4d3 b3b4 d3e4 b4b3 e4e3 b3b4 e6d6 b4a4 e3d4 a4b3 d4d3 b3b2 d3d2 b2a3

Did a recent patch change Stockfish's maximum depth limit?
Yes. It is now an unsigned int8 (before it was signed).
Unfortunately this change is from 15.5 that is too late to help in the TCEC competition.

I wonder if there are studies that stockfish can solve at depth that is bigger than 128

I tried the following study that stockfish had problems with it in the past but today it has no problem with it


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