Simple or not position for engines - not for top 10 engines(i guess)

[kiroje]

Thanks for all the replies - quite interesting that LC0 have trouble getting this one. I have tried other engines with different strength and it seems that the strongest engines gets it around 26-32 ply and weaker engines(outside top 10) needs around ply 38-42.

A somewhat simple position but it needs some depth to resolve into the win.

[mhouppin]

Analyzing with Stash 12 (development version):

Code: Select all

info depth 1 seldepth 5 multipv 1 nodes 16 nps 0 hashfull 0 time 0 score cp 110 pv h2h3
info depth 2 seldepth 6 multipv 1 nodes 109 nps 109000 hashfull 0 time 1 score cp 75 pv h2h3
info depth 3 seldepth 7 multipv 1 nodes 366 nps 366000 hashfull 0 time 1 score cp 35 pv h2h3
info depth 4 seldepth 9 multipv 1 nodes 1087 nps 1087000 hashfull 0 time 1 score cp 35 pv f5e4
info depth 5 seldepth 9 multipv 1 nodes 2461 nps 1230500 hashfull 0 time 2 score cp 21 pv h2h3
info depth 6 seldepth 12 multipv 1 nodes 6294 nps 1258800 hashfull 0 time 5 score cp 34 pv f5e4
info depth 7 seldepth 12 multipv 1 nodes 12807 nps 1423000 hashfull 0 time 9 score cp 7 pv h2h3
info depth 8 seldepth 13 multipv 1 nodes 27931 nps 1470052 hashfull 0 time 19 score cp 28 pv f5e4
info depth 9 seldepth 13 multipv 1 nodes 48259 nps 1462393 hashfull 0 time 33 score cp 10 pv f5e4
info depth 10 seldepth 16 multipv 1 nodes 193990 nps 1577154 hashfull 2 time 123 score cp 100 pv f5e6
info depth 11 seldepth 16 multipv 1 nodes 243449 nps 1690618 hashfull 2 time 144 score cp 86 pv f5e6
info depth 12 seldepth 18 multipv 1 nodes 469796 nps 1849590 hashfull 3 time 254 score cp 105 pv f5e6
info depth 13 seldepth 20 multipv 1 nodes 850504 nps 2158639 hashfull 4 time 394 score cp 103 pv f5e6
info depth 14 seldepth 20 multipv 1 nodes 1342291 nps 2396948 hashfull 6 time 560 score cp 110 pv f5e6
info depth 15 seldepth 21 multipv 1 nodes 2070320 nps 2614040 hashfull 6 time 792 score cp 110 pv f5e6
info depth 16 seldepth 22 multipv 1 nodes 4299126 nps 3317226 hashfull 13 time 1296 score cp 142 pv f5e6
info depth 17 seldepth 24 multipv 1 nodes 9671273 nps 4078984 hashfull 22 time 2371 score cp 115 pv f5e6
info depth 18 seldepth 25 multipv 1 nodes 14618849 nps 4350847 hashfull 36 time 3360 score cp 154 pv f5e6
info depth 19 seldepth 25 multipv 1 nodes 22303944 nps 4528719 hashfull 53 time 4925 score cp 162 pv f5e6
info depth 20 seldepth 29 multipv 1 nodes 45151275 nps 4745772 hashfull 120 time 9514 score cp 204 pv f5e6
info depth 21 seldepth 29 multipv 1 nodes 77464165 nps 4839997 hashfull 191 time 16005 score cp 195 pv f5e6
info depth 22 seldepth 31 multipv 1 nodes 203764846 nps 4637237 hashfull 499 time 43941 score cp 343 pv f5e6
info depth 23 seldepth 32 multipv 1 nodes 331850827 nps 4450848 hashfull 691 time 74559 score cp 377 pv f5e6
info depth 24 seldepth 33 multipv 1 nodes 487404542 nps 4476735 hashfull 798 time 108875 score cp 378 pv f5e6
info depth 25 seldepth 33 multipv 1 nodes 855629607 nps 4380229 hashfull 955 time 195339 score cp 400 pv f5e6
info depth 26 seldepth 35 multipv 1 nodes 1265832617 nps 4353470 hashfull 988 time 290764 score cp 405 pv f5e6

So Stash sees the winning "plan" at depth 22, it seems.

[JohnWoe]

Sapeli 1.79

Code: Select all

./sapeli -fen "8/2p3p1/k1p2b1p/P1P2K2/3P4/2B5/7P/8 w - - 1 46" -search 10000000
info depth 1 nodes 33 time 0 nps 0 score cp 71 pv f5e4
info depth 2 nodes 191 time 0 nps 0 score cp 65 pv f5e4
info depth 3 nodes 1113 time 0 nps 0 score cp 59 pv f5e4
info depth 4 nodes 2138 time 1 nps 2138000 score cp 62 pv f5e4
info depth 5 nodes 10258 time 5 nps 2051600 score cp 56 pv f5e4
info depth 6 nodes 30162 time 15 nps 2010800 score cp 58 pv f5e4
info depth 7 nodes 63019 time 30 nps 2100633 score cp 55 pv f5e4
info depth 8 nodes 131617 time 59 nps 2230796 score cp 54 pv f5e4
info depth 9 nodes 373460 time 139 nps 2686762 score cp 50 pv f5e4
info depth 10 nodes 778845 time 252 nps 3090654 score cp 50 pv f5e4
info depth 11 nodes 2042014 time 574 nps 3557515 score cp 54 pv f5e6
info depth 12 nodes 4664592 time 1183 nps 3943019 score cp 53 pv f5e6
info depth 13 nodes 11610975 time 2847 nps 4078319 score cp 52 pv f5e6
info depth 14 nodes 38759830 time 8900 nps 4355037 score cp 81 pv f5e6
info depth 15 nodes 57734038 time 12869 nps 4486287 score cp 74 pv f5e6
info depth 16 nodes 147526125 time 32204 nps 4580987 score cp 72 pv f5e6
info depth 17 nodes 492845811 time 107593 nps 4580649 score cp 114 pv f5e6
info depth 18 nodes 1648270569 time 360121 nps 4576990 score cp 126 pv f5e6
info depth 19 nodes 4883247875 time 1052225 nps 4640878 score cp 139 pv f5e6
info depth 20 nodes 14821057688 time 3023506 nps 4901944 score cp 153 pv f5e6
info depth 21 nodes 41852534935 time 8521895 nps 4911177 score cp 173 pv f5e6
stop
info depth 22 nodes 43018393081 time 8671008 nps 4961175 score cp 173 pv f5e6

Score is rising. Sapeli sees something. 43,018,393,081 nodes.