Gentelmen, check your engines.

[Chessnut1071]

I have another 5-move mate puzzle which some powerful engines fail to find the minimum mate.

[d]3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w 0 1

[Ras]

CT800 V1.43:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w 0 1
go infinite
(...)
info depth 17 seldepth 17 score mate 5 time 16848 nodes 18536104 nps 1100196 hashfull 258 tbhits 4 pv e1e2 f1e2 h5g7 d6b5 a7b7 a4c5 b4c5 f6g7 d8e8
bestmove e1e2

Or in mate search mode:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w 0 1
go mate 5
info depth 9 seldepth 9 score mate 5 time 3229 nodes 1799115 nps 557174 hashfull 0 tbhits 0 pv e1e2 d6c8 d8c8 e7e6 e2g4 e6e5 c8e8 e5d5 g4e6
bestmove e1e2

[Mergi]

Well, i don't even have null move enabled , so not sure if this is a fair comparison but ... just trying to find a mate.

Code: Select all

info depth 2 seldepth 10 nodes 1791 time 1 nps 1791000 hashfull 0 score cp 836 pv e5d6 e7e6
info depth 3 seldepth 8 nodes 4864 time 1 nps 4864000 hashfull 0 score cp 836 pv e5d6 e7e6 f8f6
info depth 4 seldepth 12 nodes 27301 time 2 nps 13650500 hashfull 0 score cp 932 pv e5d6 e7e6 f8f6 e6d5
info depth 5 seldepth 11 nodes 66697 time 4 nps 16674250 hashfull 0 score cp 932 pv e5d6 e7e6 f8f6 e6d5 e1f1
info depth 6 seldepth 12 nodes 346517 time 21 nps 16500809 hashfull 0 score cp 932 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1
info depth 7 seldepth 13 nodes 757074 time 39 nps 19412153 hashfull 0 score cp 932 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1 h5f4
info depth 8 seldepth 18 nodes 3982283 time 221 nps 18019380 hashfull 9 score cp 928 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1 b5d4 f4e3
info depth 9 seldepth 14 nodes 10598553 time 461 nps 22990353 hashfull 14 score cp 928 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1 b5d4 f4e3 f6f1
info depth 10 seldepth 25 nodes 276427385 time 14652 nps 18866187 hashfull 421 score mate 5 pv e1e2 f1e2 h5g7 d6b5 a7b7 f6e5 f8f7 e7d8 f7d7
bestmove e1e2

[R. Tomasi]

Yippie! This time at least my engine finds it:

Code: Select all

set-fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - -

New position: 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - -

debug-board

8|...R.R..
7|K...k...
6|.p.nPb..
5|pN..P..N
4|nP.ppp..
3|....P...
2|......P.
1|....Qq.r
-+--------
 |abcdefgh

____

Material: +2

Hash: aa9069f61e8b37b9

Signature: 11|11||4|1|3|2|10|2

Player + is on the move.

debug-pvs 12

0:     +5.02344 - xd6
  1.01 kN  in    906 mcs =>   1.11 MN/s

1:     +5.02344 - xd6
  53.0 N   in   69.5 mcs =>    763 kN/s

2:     +7.07812 - xd6 Kxe6 Rxf6
   906 N   in    617 mcs =>   1.47 MN/s

3:     +7.07812 - xd6 Kxe6 Rxf6
  1.56 kN  in    781 mcs =>   2.00 MN/s

4:     +8.07031 - xd6 Kxe6 Rxf6 Kd5 Qxf1 Rxf1 Nxd4
  22.3 kN  in   13.3 ms  =>   1.68 MN/s

5:     +8.07031 - xd6 Kxe6 Rxf6 Kd5 Qxf1 Rxf1 Nxd4
  45.7 kN  in   19.5 ms  =>   2.35 MN/s

6:     +8.10547 - xd6 Kxe6 Rxf6 Kd5 Rf5 Kc4 Qxf1 Rxf1 Nxd4 Kxb4 Nxf4
   807 kN  in    487 ms  =>   1.66 MN/s

7:     +8.10547 - xd6 Kxe6 Rxf6 Kd5 Rf5 Kc4 Qxf1 Rxf1 Nxd4 Kxb4 Nxf4
  1.23 MN  in    613 ms  =>   2.00 MN/s

8:     +9.11328 - xf6 Kxe6 Rxd6 Kf5 Rd5 Kg6 Nxf4 Kh6 Qxf1 Rxf1 Rxd4
  35.9 MN  in   21.4 s   =>   1.68 MN/s

9:     +9.11328 - xf6 Kxe6 Rxd6 Kf5 Rd5 Kg6 Nxf4 Kh6 Qxf1 Rxf1 Rxd4
  40.4 MN  in   22.1 s   =>   1.83 MN/s

10:          +M9 - Qe2 Kxe6 Nxd4 Kxe5 Rfe8 Nxe8 Qc4 Nc5 Qd5
   413 MN  in    236 s   =>   1.75 MN/s

Except from NMP I do not prune or reduce anything, which is how I look at the time it took without crying

[hgm]

Fairy-Max on 2.2GHz i3:

Code: Select all

	mover viewpoint		fewer / Multi-PV margin = 0 / more
exclude: none best +tail                                          
dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 14	    #5 	128.0M	2:15.82	e1e2 f1e2 h5g7 f6g7 e5d6 e7e6 b5c7 e6e5 e3f4
 13	    #5 	117.2M	2:06.12	e1e2 f1e2 h5g7 d6b5 a7b7 f6e5 f8f7 e7d8 f7d7
 12	    #5 	112.5M	2:01.21	e1e2 f1e2 h5g7 d6b5 a7b7 a4c5 b4c5 b6c5 e5f6
 12	    #6 	98.1M  	1:46.17	e1d1 d6b5 a7b7 a4c5 b4c5 e7e6 d1g4 e6e5 f8e8 f6e7 e8e7
 12	    #7 	60.3M  	1:05.84	b5d6 f1a6 a7a6 e7e6 f8e8 f6e7 e8e7 e6e7 d8e8 e7d7 h5f6 d7c6 e8c8
 11	    #7 	22.4M  	0:25.37	b5d6 f1a6 a7a6 e7e6 d8e8 f6e7 h5f4 e6d7 e8e7 d7e7 f8f7 e7d8 f4e6
 10	    #7 	21.2M  	0:24.12	b5d6 f1a6 a7a6 e7e6 d8e8 f6e7 h5f4 e6d7 e8e7 d7e7 f8f7 e7d8 f4e6
 10	+17.27 	9.48M  	0:10.86	e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 d4e3 f8g8 g6h7 f6f7 e3e2 g8h8 h7h8 f7f8
  9	+16.14 	4.24M  	0:04.92	e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 d4e3 f8g8 g6f7 g8g7 f7e8 g7e7 e8f8 e7e4
  8	+10.02 	1.41M  	0:01.62	e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 e1f1 h1f1 h5f4 f1f4 e3f4
  7	+9.91 	413184	0:00.46	e5f6 e7e6 d8d6 e6f5 b5d4 f5g4 f8g8 g4h5 d6d5 h5h6 g8h8 h6g6 h8h1
  6	+9.72 	104459	0:00.12	e5f6 e7e6 d8d6 e6f5 b5d4 f5g5 d6d5 g5h6 f8h8 h6g6 h5f4
  5	+8.76 	47142  	0:00.04	e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 f1f4 e1h1 d4e3
  5	+8.55 	36412  	0:00.03	e5d6 e7e6 f8f6 e6d5 f6f5 d5c4 d8c8 c4d3 e1f1
  4	+8.48 	7260    	0:00.00	e5d6 e7e6 f8f6 e6d5 f6f5 d5e6 e1f1
  3	+8.26 	1979    	0:00.00	e5d6 e7e6 f8f6 e6e5 e1f1
  3	+8.14 	1378    	0:00.00	e5f6 e7e6 d8d6 e6e5 e1f1
  2	+7.28 	577      	0:00.00	e5f6 e7e6 e1f1
  2	+5.63 	27        	0:00.00	e1f1 h1f1
  1	+5.63 	23        	0:00.00	e1f1

[j.t.]

Weird stuff going on with Nalwald again:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - - 0 1
go
info depth  1 time      0 nodes        91 nps   91000 hashfull     2 score mate 2 pv e5f6 e7e6 
bestmove e5f6

[j.t.]

Weird stuff going on with Nalwald again:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - - 0 1
go
info depth  1 time      0 nodes        91 nps   91000 hashfull     2 score mate 2 pv e5f6 e7e6 
bestmove e5f6

Okay, issue was that I was assigning checkmate scores in quiesce without generating quiet moves. Without it looks like this:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - - 0 1
go
info depth  1 time      0 nodes        98 nps   98000 hashfull     2 score cp  770 pv e5d6 e7e6 
info depth  2 time      0 nodes       273 nps  273000 hashfull     5 score cp  889 pv e5d6 e7e6 f8f6 e6e5 
info depth  3 time      0 nodes       799 nps  799000 hashfull    10 score cp  920 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g4 
info depth  4 time      1 nodes      1389 nps  694000 hashfull    14 score cp  965 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 g6h6 
info depth  5 time     13 nodes      8170 nps  583000 hashfull    25 score cp 1090 pv e5d6 e7e6 b5c7 e6e5 e3f4 f1f4 e1h1 f4e3 
info depth  6 time     17 nodes     11754 nps  653000 hashfull    29 score cp 1190 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 g6h7 d5d7 h7h6 f8h8 h6g5 
info depth  7 time     17 nodes     19484 nps 1082000 hashfull    70 score cp 1498 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 d4e3 f6f7 g6g7 b5d4 
info depth  8 time     28 nodes     30671 nps 1057000 hashfull    92 score cp 1547 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 d4e3 f8g8 g6f7 g8g7 f7e8 d6d1 
info depth  9 time     31 nodes     45807 nps 1431000 hashfull   163 score cp 1778 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 a4c3 b5d4 a5b4 f6f7 g6g7 d4e6 g7f6 
info depth 10 time   3948 nodes   4774911 nps 1209000 hashfull   233 score mate 7 pv b5d6 f1a6 a7a6 e7e6 
bestmove b5d6

[amanjpro]

Weird stuff going on with Nalwald again:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - - 0 1
go
info depth  1 time      0 nodes        91 nps   91000 hashfull     2 score mate 2 pv e5f6 e7e6 
bestmove e5f6

Okay, issue was that I was assigning checkmate scores in quiesce without generating quiet moves. Without it looks like this:

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - - 0 1
go
info depth  1 time      0 nodes        98 nps   98000 hashfull     2 score cp  770 pv e5d6 e7e6 
info depth  2 time      0 nodes       273 nps  273000 hashfull     5 score cp  889 pv e5d6 e7e6 f8f6 e6e5 
info depth  3 time      0 nodes       799 nps  799000 hashfull    10 score cp  920 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g4 
info depth  4 time      1 nodes      1389 nps  694000 hashfull    14 score cp  965 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 g6h6 
info depth  5 time     13 nodes      8170 nps  583000 hashfull    25 score cp 1090 pv e5d6 e7e6 b5c7 e6e5 e3f4 f1f4 e1h1 f4e3 
info depth  6 time     17 nodes     11754 nps  653000 hashfull    29 score cp 1190 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 g6h7 d5d7 h7h6 f8h8 h6g5 
info depth  7 time     17 nodes     19484 nps 1082000 hashfull    70 score cp 1498 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 d4e3 f6f7 g6g7 b5d4 
info depth  8 time     28 nodes     30671 nps 1057000 hashfull    92 score cp 1547 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 d4e3 f8g8 g6f7 g8g7 f7e8 d6d1 
info depth  9 time     31 nodes     45807 nps 1431000 hashfull   163 score cp 1778 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 a4c3 b5d4 a5b4 f6f7 g6g7 d4e6 g7f6 
info depth 10 time   3948 nodes   4774911 nps 1209000 hashfull   233 score mate 7 pv b5d6 f1a6 a7a6 e7e6 
bestmove b5d6

Do you return as soon as you find a checkmate? if so, then yeah that could be an issue

[amanjpro]

Zahak:

- AMD® Ryzen™ 7 4800H Processor (2.90 GHz, up to 4.20 GHz Max Boost, 8 Cores, 16 Threads, 8 MB Cache)

Code: Select all

position fen 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w - - 0 1
go infinite
info depth 1 seldepth 2 hashfull 0 nodes 116 nps 560543 score cp 924 time 0 pv e5f6 e7e6
info depth 2 seldepth 4 hashfull 0 nodes 862 nps 1015393 score cp 1029 time 0 pv e5f6 e7e6 d8d6 e6f5
info depth 3 seldepth 6 hashfull 0 nodes 6358 nps 1546878 score cp 1063 time 4 pv e5f6 e7e6 d8d6 e6f5 b5d4 f5e5
info depth 4 seldepth 6 hashfull 0 nodes 6925 nps 1508039 score cp 990 time 4 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1
info depth 5 seldepth 8 hashfull 0 nodes 8007 nps 1462708 score cp 997 time 5 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1 h5f4 d5c4
info depth 6 seldepth 8 hashfull 0 nodes 10129 nps 1444002 score cp 997 time 7 pv e5d6 e7e6 f8f6 e6d5 e1f1 h1f1 b5d4 f4e3
info depth 7 seldepth 10 hashfull 0 nodes 13649 nps 1398729 score cp 1051 time 9 pv e5f6 e7e6 d8d6 e6f5 b5d4 f5g4 e1f1 h1f1 h5f4 a5b4
info depth 8 seldepth 11 hashfull 0 nodes 17731 nps 1426104 score cp 1068 time 12 pv e5f6 e7e6 d8d6 e6f5 b5d4 f5g4 e1f1 h1f1 h5f4 a5b4 a7b7
info depth 9 seldepth 13 hashfull 0 nodes 31633 nps 1379578 score cp 1192 time 22 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 f1f4 e1h1 d4e3 b4a5 b6a5 b5d6
info depth 10 seldepth 13 hashfull 0 nodes 44493 nps 1353502 score cp 1691 time 32 pv e5f6 e7e6 d8d6 e6e5 e3f4 f1f4 e1h1 f4d2 d6d4 d2d4 b5d4 e5d4 h1e1
info depth 11 seldepth 19 hashfull 0 nodes 63424 nps 1344053 score cp 1685 time 47 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 g6h7 d5h5 h1h5 e1f1 h5h2 f1g1 h2h6 b4a5 b6a5 b5d4 h6h4 f8e8
info depth 12 seldepth 17 hashfull 0 nodes 76953 nps 1350662 score cp 1694 time 56 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 g6h7 d5h5 h1h5 e1f1 h5h2 f1g1 h2h6 b4a5 b6a5 b5d4
info depth 13 seldepth 21 hashfull 1 nodes 124794 nps 1361665 score cp 1837 time 91 pv e5f6 e7e6 d8d6 e6f5 d6d5 f5g6 h5f4 f1f4 e1h1 f4f6 f8f6 g6f6 h1h6 f6f7 h6f4 f7g6 f4e4 g6f7 e4d4 a5b4 d4b4
info depth 14 seldepth 20 hashfull 2 nodes 203683 nps 1383484 score cp 2045 time 147 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 f7g7 e3d4 h7h5 b4a5 h5b5 a5b6 g7h7
info depth 15 seldepth 26 hashfull 5 nodes 512701 nps 1461645 score cp 2131 time 350 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 f4e3 b5d4 f7f8 a7b8 h7e7 d4e6 f8g8 f1e3 e7e8 b8c7 e8a8 b4a5 a8a5
info depth 16 seldepth 27 hashfull 10 nodes 906482 nps 1501006 score cp 2169 time 603 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 f7g8 a7b8 f4f3 e3d4 h7f7 g2f3 f7f3 e4g4 g8f8 b4a5 b6a5 d6d8 f8f7 e1a5
info depth 17 seldepth 30 hashfull 25 nodes 2048266 nps 1537521 score cp 2366 time 1332 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 f7g8 a7b8 f4e3 b5d4 b6b5 f1e3 a4b2 d4b5 h7f7 d6d8 g8g7 e1g3 g7h7 b4a5 h7h6 g3d6 h6h7
info depth 18 seldepth 30 hashfull 76 nodes 5347314 nps 1545333 score cp 2546 time 3460 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 f7f8 a7b8 f4e3 d6d8 f8f7 d8d7 f7f8 d7h7 f8g8 e4h4 a5b4 b5d4 b4b3 f1e3 a4c5 b8c7 b3b2
info depth 19 seldepth 35 hashfull 164 nodes 10737105 nps 1523797 score cp 2611 time 7046 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 f7f8 a7b8 f4e3 d6d8 f8f7 b5d4 a4c5 b4c5 h7h6 e1e3 h6f6 e4e7 f7g6 e7e6 f6e6 e3e6 g6g5 c5b6 a5a4 e6f5 g5h6 b8c7
info depth 20 seldepth 34 hashfull 212 nodes 14584615 nps 1522340 score cp 2680 time 9580 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 a4c5 e4f4 f7e8 a7b6 c5a4 b6a5 d4d3 a5a4 h7d7 d6d7 e8d7 e1g3 d7e7 g3g6 e7d7 g6d3 d7e7 a4a3 e7e8 d3g6 e8d7
info depth 21 seldepth 37 hashfull 249 nodes 17291578 nps 1517946 score cp 2701 time 11391 pv e5f6 e7e6 d8d6 e6f5 h5g3 f5g6 g3f1 h1h7 f6f7 g6g7 f8e8 g7f7 e8e4 a4c5 e4f4 f7g8 a7b6 c5d7 b6a5 g8h8 b5d4 d7e5 d4f5 h8g8 d6d8 g8f7 e1c3 e5g4 c3c7 f7g6 d8d6 g4f6 d6f6 g6f6 c7h7 f6e5 a5b6
info depth 22 seldepth 13 hashfull 385 nodes 28230076 nps 1514238 score mate +6 time 18643 pv b5d6 f1a6 a7a6 e7e6 f8e8 f6e7 e8e7 e6e7 d8e8 e7d7 h5f6 d7c6 e8c8
info depth 23 seldepth 13 hashfull 416 nodes 32371029 nps 1519450 score mate +6 time 21304 pv b5d6 f1a6 a7a6 e7e6 f8e8 f6e7 e8e7 e6e7 d8e8 e7d7 h5f6 d7c6 e8c8
info depth 24 seldepth 13 hashfull 443 nodes 36627914 nps 1527934 score mate +6 time 23972 pv b5d6 f1a6 a7a6 e7e6 f8e8 f6e7 e8e7 e6e7 d8e8 e7d7 h5f6 d7c6 e8c8
info depth 25 seldepth 13 hashfull 485 nodes 44640469 nps 1539747 score mate +6 time 28992 pv b5d6 f1a6 a7a6 e7e6 f8e8 f6e7 e8e7 e6e7 d8e8 e7d7 h5f6 d7c6 e8c8
info depth 26 seldepth 9 hashfull 579 nodes 62594746 nps 1527214 score mate +4 time 40986 pv e1e2 d6b5 e2b5 f1b5 e5f6 e7e6 h5g7 e6e5 e3d4

Needed 18 seconds to find a mate, and 40 to find the shortest mate

[AndrewGrant]

Ethereal 13.35 NNUE
info depth 35 seldepth 24 multipv 1 score mate 5 time 2406 nodes 7137572 nps 2965000 tbhits 0 hashfull 577 pv e1e2 f1e2 h5g7 d6b5 a7b7 a4c5 b4c5 f6e5 d8e8