Can your engine find this move ?

[Nomis]

Hi,

During testing my engine reached (with white) this position:
[d]3r1r2/2n1kp1Q/5p1p/1pqpp2B/pRp1P2P/P1P3P1/P2R1PK1/8 w - - 0 44

White is losing, and it seems the only non-catastrophic move here is e4xd5.

Stockfish and Komodo find that move at depth 8 or 9. I find that rather puzzling, as the few other engines I tried can't find it, including GNUChess. Even at depth 20 my engine does not find it.

[xr_a_y]

Very fast for Minic it seems (without NNUE loaded)

Code: Select all

info string This is Minic version 3.04 (NNUE available)
info string Info  2021-02-06 22:06:33-300: No NNUE net loaded, using standard evaluation
info depth 1 score cp -42 time 1 nodes 51 nps 50999 seldepth 4 tbhits 0 pv h7h6 
info depth 2 score cp 39 time 1 nodes 298 nps 298000 seldepth 9 tbhits 0 pv h7g7 d5e4 
info depth 3 score cp 39 time 1 nodes 365 nps 364999 seldepth 9 tbhits 0 pv h7g7 d5e4 d2d8 
info depth 4 score cp 39 time 1 nodes 461 nps 460999 seldepth 9 tbhits 0 pv h7g7 d5e4 d2d8 e7d8 
info depth 5 score cp 2 time 1 nodes 734 nps 733999 seldepth 9 tbhits 0 pv b4b1 c5a3 e4d5 
info depth 5 score cp -40 time 1 nodes 1268 nps 1268000 seldepth 12 tbhits 0 pv d2d1 d5e4 d1d8 e7d8 h5f7 
info depth 6 score cp -24 time 1 nodes 1862 nps 1861999 seldepth 12 tbhits 0 pv d2d1 c7e6 e4d5 d8d5 h7h6 d5d1 
info depth 7 score cp -42 time 4 nodes 5267 nps 1316749 seldepth 14 tbhits 0 pv d2d1 c5c6 h5f3 c6e6 d1e1 d5e4 f3e4 
info depth 8 score cp -72 time 9 nodes 8131 nps 903444 seldepth 16 tbhits 0 pv d2d1 d5d4 g2h1 d4c3 d1d8 
info depth 8 score cp -55 time 23 nodes 24282 nps 1055739 seldepth 22 tbhits 0 pv g2g1 d8d6 e4d5 c7d5 b4b2 d5c3 h7h6 c5a3 
info depth 9 score cp -83 time 27 nodes 28853 nps 1068629 seldepth 22 tbhits 0 pv g2g1 d5e4 g1h1 
info depth 9 score cp -127 time 41 nodes 44286 nps 1080146 seldepth 22 tbhits 0 pv g2g1 d5e4 d2d8 e7d8 h7h6 d8e7 b4b2 c5a3 b2c2 c7d5 
info depth 9 score cp -120 time 52 nodes 57588 nps 1107461 seldepth 23 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 a3c5 g2h2 c5c6 h5f3 
info depth 10 score cp -94 time 53 nodes 58365 nps 1101226 seldepth 23 tbhits 0 pv e4d5 d8d5 h7h6 d5d3 
info depth 10 score cp -109 time 54 nodes 59807 nps 1107537 seldepth 23 tbhits 0 pv e4d5 d8d5 h7h6 d5d3 h5f3 d3c3 h6g7 c3a3 b4b2 
info depth 11 score cp -96 time 77 nodes 87365 nps 1134610 seldepth 24 tbhits 0 pv e4d5 d8d5 b4b2 c5a3 d2d5 a3b2 d5d1 b2c3 h7h6 c3a5 g2h2 
info depth 12 score cp -118 time 91 nodes 104446 nps 1147758 seldepth 24 tbhits 0 pv h7h6 f8h8 f2f4 
info depth 12 score cp -96 time 108 nodes 124502 nps 1152796 seldepth 25 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 d5c3 d2d8 e7d8 c2d2 d8e7 h5g4 f8d8 d2d8 e7d8 
info depth 12 score cp -153 time 143 nodes 167867 nps 1173895 seldepth 27 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 h7h6 b4c3 f2f3 
info depth 12 score cp -159 time 161 nodes 191973 nps 1192378 seldepth 27 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 c3b4 c4c3 d2d1 d5b4 d1d8 e7d8 c2e2 c3c2 e2c2 b4c2 
info depth 13 score cp -159 time 176 nodes 211338 nps 1200784 seldepth 27 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 c3b4 c4c3 d2d1 d5b4 d1d8 e7d8 c2e2 
info depth 14 score cp -159 time 195 nodes 235417 nps 1207266 seldepth 27 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 c3b4 c4c3 d2d1 d5b4 d1d8 e7d8 c2e2 c3c2 
info depth 15 score cp -159 time 222 nodes 270500 nps 1218468 seldepth 27 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 c3b4 c4c3 d2d1 d5b4 d1d8 e7d8 c2e2 c3c2 e2c2 
info depth 16 score cp -159 time 257 nodes 316292 nps 1230708 seldepth 27 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 c3b4 c4c3 d2d1 d5b4 d1d8 e7d8 c2e2 c3c2 e2c2 b4c2 
info depth 17 score cp -159 time 364 nodes 452255 nps 1242458 seldepth 29 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 c3b4 c4c3 d2d1 d5b4 d1d8 e7d8 c2e2 c3c2 e2c2 b4c2 h7c2 
info depth 18 score cp -169 time 479 nodes 599349 nps 1251250 seldepth 29 tbhits 0 pv e4d5 c7d5 b4b2 c5a3 b2c2 b5b4 d2d5 d8d5 h5f3 b4b3 f3d5 b3c2 h7c2 a3c5 d5f7 

[Nomis]

Does seldepth 25 mean Minic searched until depth 25 on selected lines of the search to find this ?

[xr_a_y]

Yes indeed

[JVMerlino]

Myrddin (8 cores) finds it in 3.7 seconds:

Code: Select all

 1   -160      0           55 e4d5 c7d5
 1   -116      0          125 h7h6 d5e4
 2   -116      1          218 h7h6 d5e4 a3b4 (14 KNPS)
 3   -100      1         2803 h7h6! (186 KNPS)
 3   -132      1         3531 h7h6? f8h8 e4d5 (235 KNPS)
 3   -112      1         6121 g2g1 d5d4 h7g7 (408 KNPS)
 4   -117      1        33652 g2g1 d5d4 h7h6 (2243 KNPS)
 5   -116      1        79372 g2g1 d5d4 (5291 KNPS)
 6   -132      3       149318 g2g1? d5d4 (4816 KNPS)
 6   -145      4       434313 g2g1 d5d4 d2d1 c5c6 h7h6 c6e4 (9240 KNPS)
 7   -158      7       886889 g2g1 d5d4 d2d1 d4d3 d1b1 c5c6 h5f7 (11370 KNPS)
 8   -174     12      1530901 g2g1? d5d4 (12247 KNPS)
 8   -176     21      2909597 g2g1 d5d4 d2d1 d4d3 d1d2 c5c6 b4b1 f8h8 (13346 KNPS)
 9   -185     29      4006060 g2g1 d5d4 d2d1 d4d3 d1d2 (13488 KNPS)
10   -176     45      6192791 g2g1 d5d4 d2c2 d4d3 c2d2 (13670 KNPS)
10   -174     51      6905696 d2d1 d5d4 g2g1 (13409 KNPS)
11   -174     67      9334803 d2d1 d5d4 g2g1 (13891 KNPS)
12   -190    117     15613327 d2d1? d5d4 (13321 KNPS)
12   -199    217     29238331 d2d1 d5d4 d1d2 d4d3 g2g1 (13461 KNPS)
13   -215    325     43616959 d2d1? d5d4 (13420 KNPS)
13   -183    371     50306200 e4d5! d5d4 (13530 KNPS)
13   -170    387     52549008 e4d5 c7d5 b4b2 d5c3 d2d8 e7d8 h7h6 d8e7 h6h7 c5a3 b2d2 c3a2 h5f7 (13561 KNPS)
14   -186    426     57944098 e4d5? c7d5 (13585 KNPS)
14   -191    592     80221447 e4d5 c7d5 b4b2 d5c3 d2d8 e7d8 h7h6 d8e7 b2c2 c3e4 h6h7 c5d4 h7f5 f8d8 (13546 KNPS)
15   -175    764    104500170 e4d5! (13678 KNPS)
15   -159    832    114714642 e4d5! (13774 KNPS)
15   -159    850    117148559 e4d5 c7d5 b4b2 d5c3 d2d8 e7d8 h7h6 d8e7 b2c2 c3d5 h6g7 e7e8 c2d2 c4c3 d2d1 c3d2 (13782 KNPS)
16   -162   1192    165318276 e4d5 c7d5 b4b2 d5c3 d2d8 e7d8 b2c2 c3b1 h7h6 d8e7 h5f3 f8d8 c2b2 b1a3 b2d2 d8d3 (13866 KNPS)

jm