test positions for weak playing engines only

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Henk
Posts: 7220
Joined: Mon May 27, 2013 10:31 am

Re: test positions for weak playing engines only

Post by Henk »

Until time is up or engine decides move is good enough.
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Robert Pope
Posts: 558
Joined: Sat Mar 25, 2006 8:27 pm

Re: test positions for weak playing engines only

Post by Robert Pope »

flok wrote:Hi,

This is probably a dumb question but I want to be sure that I'm doing the right thing.

Let's say I have an EPD-string like this:

8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - - bm Rxb2; id "WAC.002";

How should I test this?
Do I start at search-depth and then keep increasing until either time is up or a certain depth is reached? Or do I keep searching until I find that Rxb2? I'm asking because sometimes the move is found at, say, depth 3 but at depth 4 something else is chosen.


regards
Typically, you pick a time limit, say 10 seconds per position. Then see whether the last pv your program output has selected one of the best moves.

Afterward, you can go back and see if they picked the right move for the right reason (e.g. seeing the outcome of a winning capture sequence). Or you can focus on positions that you take a long time to find that other programs find quickly.
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Henk
Posts: 7220
Joined: Mon May 27, 2013 10:31 am

Re: test positions for weak playing engines only

Post by Henk »

Don't like it that test positions have only best move and not a PV. If my engine cannot find it how do I know best move is correct and what might have been the cause.
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Henk
Posts: 7220
Joined: Mon May 27, 2013 10:31 am

Re: test positions for weak playing engines only

Post by Henk »

Maybe a work around is to add positions position + best move for all moves of a PV. In this way input format doesn't need to be modified. So you add easier test positions for the same problem.
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stegemma
Posts: 859
Joined: Mon Aug 10, 2009 10:05 pm
Location: Italy
Full name: Stefano Gemma

Re: test positions for weak playing engines only

Post by stegemma »

Henk wrote:https://chessprogramming.wikispaces.com/Test-Positions

[d] rn1qkb1r/pp2pppp/5n2/3p1b2/3P4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 0 1

I tried the first one of "CCR one hour test" but Skipper thinks Nf3 is better than Qb3.
Satana (that is one of the weakest engines in the world) finds Qf3 after a few instants (ply 6) and Qb3 after a few seconds (ply 8). It keeps this move as the best one at ply 10... and then I've stopped. It seems to me that ply 8 is the minimum to find this move. What ply does your software reach?
Author of Drago, Raffaela, Freccia, Satana, Sabrina.
http://www.linformatica.com
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Henk
Posts: 7220
Joined: Mon May 27, 2013 10:31 am

Re: test positions for weak playing engines only

Post by Henk »

Code: Select all

Depth  Value   Time(seconds)   Nodes
 13      0.07      10.00      432989   g1f3 
 12      0.03       4.75      201217   f1b5 
 11      0.00       3.52      148977   d1b3 
 10      0.00       1.91       78964   d1b3 
  9      0.01       0.72       28456   d1b3 
  8      0.01       0.29       11112   d1b3 
  7      0.01       0.27       10053   d1b3 
  6      0.01       0.18        6522   d1b3 
  5      0.01       0.10        2977   d1b3 
  4      0.01       0.09        2714   d1b3 
  3      0.01       0.05        1176   d1b3 
  2      0.01       0.04         791   d1b3 
  1      0.01       0.02          83   d1b3
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Henk
Posts: 7220
Joined: Mon May 27, 2013 10:31 am

Re: test positions for weak playing engines only

Post by Henk »

Stockfish 6

Code: Select all

 26	+0.17	43.7M	0:32.85	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Be2 a5 O-O O-O Qc6 Rb8 h3 Ne4 Nxe4 Bxe4 Qa4 Qc7 Bb5 Nf6 Ne5 Qb6 Nc6 Qxb5 Nxe7+ Kh8 Qxb5 Rxb5 Re1 h6 Bd2 Rxb2
 26	+0.16	33.0M	0:24.67	Qb3 e6?
 25	+0.22	25.6M	0:19.19	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Qa6 O-O Be2 Qb8 h3 Rc8 Bb5 Rc7 O-O Ne4 Bd2 Nd6 Bxd7 Rxd7 Ne5 Rb7 b3 Qc8 Nc6 Bg5 f4 Rc7 Qxc8+ Raxc8 Nxa7
 24	+0.19	19.7M	0:14.72	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Qa6 O-O Be2 Qb8 O-O Rc8 h3 Ne4 Nxe4 Bxe4 Bb5 Qb6 Qxb6 Nxb6 Ne5 Bf6 f3 Bxe5 dxe5 a6
 24	+0.20	16.4M	0:12.27	Qb3!
 24	+0.14	14.4M	0:10.91	Qb3 e6?
 23	+0.20	10.8M	0:08.14	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Be2 a5 Qb3 O-O O-O Ne4 Nxe4 Bxe4 Qa4 Rb8 h3 Qc7 Bb5 Nf6 b3 Bb4 Bd2 Qb6 Bxb4
 23	+0.15	9.6M	0:07.24	Qb3 e6?
 22	+0.21	6.7M	0:05.02	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Be2 O-O O-O a6 Qc6 Qc8 Qa4 Nb6 Qd1 h6 Bd2 Nc4 Bxc4 dxc4 Qe2 Ne4 Nxe4
 22	+0.20	6.0M	0:04.50	Qb3!
 22	+0.14	5.7M	0:04.27	Qb3 e6?
 21	+0.20	4.1M	0:03.06	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Be2 O-O O-O a5 Qb3 Ne4 Nxe4 Bxe4 Qa4 Nb6 Qb5 Bxf3 Bxf3 Nc4 Be2 Rc8
 20	+0.10	3.1M	0:02.25	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Be2 O-O O-O a5 Qb3 Ne4 Nxe4 Bxe4 Bd2 Rb8 Qc3 Bb4 Qc1 Rc8 Qd1 Rc2 Rb1
 19	+0.13	2.3M	0:01.72	Qb3 e6 Qxb7 Nbd7 Nf3 Be7 Be2 O-O O-O a5 Qb3 Ne4 Nxe4 Bxe4 h3 Rb8 Qa4 Rb4 Qd1 Rb6 b3
 18	+0.17	1.4M	0:01.02	Qb3 e6 Qxb7 Nbd7 Qa6 Bb4 Nf3 O-O Bd2 Rb8 Rc1 Qc8 a3 Bxc3 Bxc3 Ne4 Qxc8 Rfxc8 h3
 17	+0.17	1.2M	0:00.89	Qb3 e6 Qxb7 Nbd7 Qa6 Bb4 Nf3 O-O Bd2 Rb8 Rc1 Qc8 a3 Bxc3 Bxc3 Ne4 Qxc8 Rfxc8 h3 Nxc3
 16	+0.17	1.1M	0:00.83	Qb3 e6 Qxb7 Nbd7 Qa6 Bb4 Nf3 O-O Bd2 Rb8 a3 Be7 Bb5 Qc8 Qa4 Qb7 O-O Nb6
 15	+0.17	963113	0:00.70	Qb3 e6 Qxb7 Nbd7 Qa6 Bb4 Nf3 O-O Bd2 Rb8 Rc1 Qc8 Bb5 Qxa6 Bxa6
 14	+0.25	482005	0:00.34	Nf3 Nc6 Be2 e6 Nh4 Bg6 O-O a6 Bd2 Bd6 h3 Rc8 a3 O-O Nxg6 hxg6 Rc1 b5 Bd3 Qc7
 13	+0.22	215874	0:00.16	Nf3 e6 Nh4 Bg6 Be2 Nc6 O-O a6 Bd2 Bd6 h3 Rc8 Nxg6 hxg6 a3 O-O
 12	+0.16	144827	0:00.10	Qb3 e6 Qxb7 Nbd7 Qa6 Bb4 Nf3 O-O Bb5 Rb8 O-O Qb6
 11	+0.13	86570	0:00.06	Nf3 e6 Nh4 Bg6 Be2 Nc6 O-O Bd6 Bd2 a6 h3 O-O Nxg6 hxg6
 10	+0.32	36546	0:00.02	Nf3 e6 Nh4 Bg6 Be2 Nc6 O-O Bd6 Bd2 O-O Nxg6
  9	+0.29	12245	0:00.00	Nf3 e6 Ne5 Nbd7 g4 Nxe5 gxf5 Nc6 fxe6
  8	+0.29	9337	0:00.00	Nf3 e6 Ne5 Nbd7 g4 Nxe5 gxf5 Nc6
  7	+0.41	6146	0:00.00	Nf3 Nc6 Qa4 e6 Ne5 Be7 Nxc6
  6	+1.49	1155	0:00.00	g4 Nxg4 h3 Nxf2 Bb5+ Nc6 Kxf2
  5	+1.49	918	0:00.00	g4 Nxg4 h3 Nxf2 Bb5+ Nc6
  4	+1.49	795	0:00.00	g4 Nxg4 h3 Nxf2 Bb5+ Nc6 Kxf2
  3	+0.32	312	0:00.00	Nf3 e6 Bb5+ Nc6 Ne5
  2	+0.97	115	0:00.00	Nf3 b6 Bb5+ Nbd7
  1	+0.49	45	0:00.00	Nf3
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Joost Buijs
Posts: 1563
Joined: Thu Jul 16, 2009 10:47 am
Location: Almere, The Netherlands

Re: test positions for weak playing engines only

Post by Joost Buijs »

Nightmare sees it at depth 12, and sometimes at depth 11, it depends upon the randomness of the SMP.

Code: Select all

info depth 1 score cp 60 time 0 nodes 257 nps 257 tbhits 0 pv g1f3
info depth 2 score cp 10 time 1 nodes 1003 nps 1003000 tbhits 0 pv f1d3 d8d7
info depth 3 score cp 15 time 2 nodes 2983 nps 1491500 tbhits 0 pv g1f3 b8c6 f1d3
info depth 4 score cp 5 time 4 nodes 5015 nps 1253750 tbhits 0 pv g1f3 b8c6 f1d3 d8d7
info depth 5 score cp 42 time 9 nodes 13602 nps 1511333 tbhits 0 pv f1d3 f5d3 d1d3 b8c6 g1f3
info depth 6 score cp 23 time 21 nodes 40288 nps 1918476 tbhits 0 pv f1b5 b8c6 g1f3 a7a6 b5c6 b7c6
info depth 7 score cp 53 time 29 nodes 82048 nps 2829241 tbhits 0 pv f1b5 b8c6 g1f3 d8d6 e1g1 f6e4 f3e5
info depth 8 score cp 58 time 47 nodes 185162 nps 3939617 tbhits 0 pv f1d3 f5d3 d1d3 e7e6 g1f3 b8c6 e1g1 f8d6
info depth 9 score cp 61 time 68 nodes 336656 nps 4950823 tbhits 0 pv g1f3 e7e6 d1b3 b8c6 b3b7 a8c8 f1b5 d8d7 b5c6
info depth 10 score cp 53 time 94 nodes 567809 nps 6040521 tbhits 0 pv g1f3 e7e6 d1b3 b8d7 b3b7 f8d6 f1b5 e8g8 e1g1 g8h8
info depth 11 score cp 57 time 131 nodes 907178 nps 6925022 tbhits 0 pv g1f3 e7e6 d1b3 b8d7 b3b7 f8d6 f1b5 e8g8 e1g1 d8b6 b5c6
info depth 12 score cp 29 time 374 nodes 3872182 nps 10353427 tbhits 0 pv d1b3 d8c7 g1e2 e7e6 e2g3 f5g6
info depth 13 score cp 26 time 733 nodes 8722731 nps 11900042 tbhits 0 pv d1b3 d8c7 g1f3 b8c6 f1e2 e7e6 e1g1 a7a6
info depth 14 score cp 37 time 921 nodes 11012733 nps 11957364 tbhits 0 pv d1b3 d8c7 g1f3 b8c6 c3d5 f6d5 b3d5 e7e6 d5b3 f8b4 c1d2 b4d2
info depth 15 score cp 23 time 1487 nodes 18706992 nps 12580357 tbhits 0 pv d1b3 d8c7 c3d5 f6d5 b3d5 e7e6 f1b5 b8c6 d5c4 f8d6 b5c6 c7c6
info depth 16 score cp 33 time 1969 nodes 25289482 nps 12843820 tbhits 0 pv d1b3 d8c7 c3d5 f6d5 b3d5 e7e6 f1b5 b8c6 d5c4 a8c8 g1f3 f8d6
info depth 17 score cp 44 time 3241 nodes 42990064 nps 13264444 tbhits 0 pv d1b3 d8c7 c3d5 f6d5 b3d5 e7e6 d5b3 b8c6 g1f3 f5g4 f3d2 f8b4
info depth 18 score cp 33 time 6517 nodes 86849078 nps 13326542 tbhits 0 pv d1b3 d8c7 c3d5 f6d5 b3d5 e7e6 d5b3 b8c6 g1f3 f5e4 c1d2 e4f3
info depth 19 score cp 23 time 15124 nodes 208191514 nps 13765638 tbhits 0 pv d1b3 e7e6 b3b7 b8d7 g1f3 f8d6 b7a6 d8e7 f1d3 f5d3 a6d3 e8g8
Today I found another bug which I introduced some time ago by refactoring.
It was SMP related, I always tune my engine single core, that's why I didn't notice it.
You're not the only one plagued by bugs. :wink:
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Henk
Posts: 7220
Joined: Mon May 27, 2013 10:31 am

Re: test positions for weak playing engines only

Post by Henk »

Skipper can't solve the second of Bratko:

[d] 3r1k2/4npp1/1ppr3p/p6P/P2PPPP1/1NR5/5K2/2R5 w - -

Stockfish 6:

Code: Select all

 28	+1.10	42.3M	0:22.42	d5 cxd5 e5!
 28	+0.91	33.2M	0:17.55	d5 cxd5 e5 R6d7 Nd4 Rb8 f5 Rdd8 Kf3 Re8 Rb3 f6 e6 Rec8 Rxc8+ Nxc8 Nc6?
 28	+0.97	32.0M	0:16.92	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Rc7 Rbc8 e6 Rxc7 Rxc7 Rc8?
 27	+1.03	28.0M	0:14.83	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Rdc8 Rc7 Rxc7 Rxc7 Rc8 Rxc8+ Nxc8 Nb5 g6 hxg6 fxg6 Kd4 Ne7 Nc3 h5 gxh5 gxh5 Nxd5 Nxd5 Kxd5 Kf7 f5 Ke7
 27	+0.98	26.3M	0:13.92	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8?
 27	+1.04	25.3M	0:13.45	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Rdc8 Rc7 Rxc7 Rxc7 Rc8 Rxc8+ Nxc8 Nb5 g6 hxg6 fxg6 Nd6 Nxd6?
 26	+1.10	24.7M	0:13.12	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Rdc8 Rc7 Rxc7 Rxc7 Rc8 Rxc8+
 26	+1.05	23.2M	0:12.28	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Rdc8 Rxc8+ Rxc8 Rxc8+ Nxc8 Nb5 g6 Nc3 gxh5 gxh5 f6 exf6 Na7 Kd4 Kf7 Kxd5 Kxf6 Ke4 Kf7 Kd5?
 25	+1.11	20.1M	0:10.67	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Rbc8 Rxc8 Rxc8 Rxc8+ Nxc8 Nb5 Ne7 Kd4 g6 Nc3 gxh5 gxh5 Ke8!
 24	+1.05	12.6M	0:06.63	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Rbc8 Rxc8 Rxc8 Rxc8+ Nxc8 Nb5 Ne7 Kd4 g6 Nc3 gxh5 gxh5 Ke8 Nxd5 Nxd5 Kxd5 Kd7
 24	+1.04	11.2M	0:05.86	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 Kd3 Kg8 Rc7 Rbc8 R1c2 Kf8 Rxc8 Rxc8 Rxc8+ Nxc8 Nb5 g6 hxg6 fxg6 Kd4 Ne7!
 23	+0.98	7.9M	0:04.13	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 R3c2 Rbc8 Rxc8 Rxc8 Rxc8+ Nxc8 Nb5 Ke7 Kd4 Kd7 Kxd5 Ne7+ Ke4 f6 Nd6 fxe5 fxe5 g5 Nf7 Ke6 Nxh6 Nc6 Nf5 Nxe5
 22	+0.92	6.7M	0:03.52	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 R3c2 Kg8 f5 Re8 Rc7 Kf8 Rb1 Rbc8 Rxc8 Nxc8 Nc6 Ne7 Nxe7 Rxe7 Kd4 Rc7 Kxd5 Rc5+ Kd4
 22	+0.88	6.4M	0:03.33	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 R3c2 Rbc8 Nb5 Rxc2 Rxc2 d4+ Nxd4 Nd5+ Ke4 Nb4 Rd2 Kg8 f5?
 22	+1.01	5.9M	0:03.06	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 R3c2 Rdc8 Nb5 Rxc2 Rxc2 Ke8 Rc7 Kd8 Kd4 Rc8 Rxc8+ Kxc8 Nd6+ Kd7!
 21	+0.94	3.9M	0:02.03	d5 cxd5 e5 R6d7 Nd4 Rb8 Ke3 Rdd8 R3c2 Rdc8 Nb5 Rxc2 Rxc2 Ke8 Rc7 Kd8 Kd4 Rc8 Rxc8+ Kxc8 Nd6+ Kd7 Nxf7 Ke6 Nd8+ Kd7 Nb7 Kc6
 20	+0.85	3.3M	0:01.70	d5 cxd5 e5 R6d7 Nd4 Re8 Ke3 f6 e6 Rdd8 Rc7 Rc8 Rxc8 Rxc8 Rxc8+ Nxc8 Nf5 Ne7 Nxe7 Kxe7 f5 b5 axb5
 19	+0.91	1.9M	0:01.00	d5 cxd5 e5 R6d7 Nd4 Rb7 Ke3 Rbb8 R3c2 Rdc8 Rxc8+ Rxc8 Rxc8+ Nxc8 Nc6 Ne7 Nxe7
 18	+0.87	1.3M	0:00.69	d5 cxd5 e5 R6d7 Nd4 Re8 Ke3 f6 Rb1 Rc8 Rxc8+ Nxc8 Rc1 Ne7 e6 Rd8 Rb1 Rc8 Rxb6 Rc3+ Kf2 Rc4 Rb8+ Rc8 Rxc8+ Nxc8
 17	+0.87	1.3M	0:00.66	d5 cxd5 e5 R6d7 Nd4 Re8 Ke3 f6 Rb1 Rc8 Rxc8+ Nxc8 Rc1 Ne7 e6 Rd8 Rb1 Rc8 Rxb6 Rc3+ Kf2 Rc4 Rb8+ Rc8 Rxc8+ Nxc8
 16	+0.93	664926	0:00.36	d5 cxd5 e5 R6d7 Nd4 Re8 Ke3 Rdd8 Rc7 Rc8 Rxc8 Rxc8 Rxc8+ Nxc8 Nc6 Ne7 Nxe7 Kxe7 Kd4 Ke6 f5+ Ke7 Kxd5
 15	+0.87	290966	0:00.17	d5 cxd5 e5 R6d7 Nd4 Re8 Kf3 Rdd8 Rb1 Rb8 Rc7 Rec8 Rxc8+ Rxc8 Rxb6 Kg8 Nb5 Rc4 Rb8+ Kh7 Rf8
 14	+0.80	196303	0:00.13	d5 cxd5 e5 R6d7 Nd4 Re8 Rb1 Rb7 Kf3 Rc8 Rxc8+ Nxc8 Rc1 Ne7 Ke3 Rb8 Rb1 f6 exf6 gxf6
 13	+0.84	132881	0:00.10	d5 cxd5 e5 R6d7 Nd4 Re8 Rb1 Rb7 Ke3 Rbb8 Rc7 Rec8 Rxc8+ Rxc8 Rxb6 Rc3+ Kd2 Rc4 Rb8+ Nc8 Ne2
 12	+0.89	58965	0:00.05	d5 cxd5 e5 R6d7 Nd4 Rb7 f5 Re8 Kf3 Rbb8 Rb1 Kg8 Kf4 Kh7 e6 fxe6 fxe6
 11	+0.80	28566	0:00.03	d5 cxd5 e5 R6d7 Nd4 Rb7 f5 Re8 f6 gxf6 exf6 Ng8 Rc6 Rbb8
 10	+0.91	17386	0:00.02	d5 cxd5 e5 R6d7 Nd4 Rb7 f5 Re8 Rb3 Rc8 Rxc8+ Nxc8 Rc3
  9	+0.98	9410	0:00.02	d5 cxd5 e5 R6d7 Nd4 Kg8 f5 Rb7 f6
  8	+0.90	6111	0:00.00	d5 cxd5 e5 R6d7 Nd4 Kg8 Rb3 Rb8
  7	+0.86	4910	0:00.00	d5 cxd5 e5 R6d7 Nd4 Kg8 Rb1
  6	+0.83	4187	0:00.00	d5 cxd5 e5 R6d7 Nd4 Kg8
  5	+0.51	2094	0:00.00	g5 R6d7 Rg1 hxg5 fxg5
  4	+0.53	1344	0:00.00	g5 R6d7 Ke2 Kg8
  3	+0.51	964	0:00.00	g5 R6d7 gxh6 gxh6
  2	+0.55	469	0:00.00	g5 R6d7
  1	+0.85	69	0:00.00	e5 Rxd4 Nxd4 Rxd4
  0	#
Skipper:

Code: Select all

Depth  Value   Time(seconds)   Nodes
 18     -0.09       9.62      559265   f2e3 
 17     -0.08       5.97      341768   f2e3 
 16     -0.09       3.92      232516   f2e3 
 15     -0.08       2.43      140494   f2e3 
 14     -0.09       1.84      107010   f2e3 
 13     -0.08       1.54       87297   f2e3 
 12     -0.09       0.83       42127   f2e3 
 11     -0.08       0.63       31872   f2e3 
 10     -0.09       0.30       14984   f2e3 
  9     -0.08       0.17        8466   f2e3 
  8     -0.09       0.14        6654   f2e3 
  7     -0.08       0.10        4296   f2e3 
  6     -0.08       0.07        2625   f2e3 
  5     -0.08       0.06        2028   f2e3 
  4     -0.09       0.04         904   f2e3 
  3     -0.09       0.02         278   f2e3 
  2     -0.09       0.02         206   f2e3 
  1     -0.09       0.02          76   f2e3
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Joost Buijs
Posts: 1563
Joined: Thu Jul 16, 2009 10:47 am
Location: Almere, The Netherlands

Re: test positions for weak playing engines only

Post by Joost Buijs »

It is a long time ago that I tried Bratko, Nightmare has no problems in finding this one.

Code: Select all

FEN: 3r1k2/4npp1/1ppr3p/p6P/P2PPPP1/1NR5/5K2/2R5 w - - 0 1

Nightmare MP:
 1	00:00	 54	54	+0.50	Kf2-g2
 2	00:00	 217	217	+0.44	Kf2-g2 Kf8-g8
 3	00:00	 1k	1k	+0.40	Kf2-g2 Rd6-e6 Rc1-e1
 4	00:00	 4k	2,073k	+0.30	g4-g5 Rd6-e6 Rc1-e1 h6xg5
 5	00:00	 10k	2,609k	+0.36	Kf2-g3 Kf8-g8 Rc1-c2 Rd6-e6 Rc2-e2
 6	00:00	 27k	3,050k	+0.46	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Kf8-g8
 7	00:00	 40k	3,663k	+0.58	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Kf2-g2
 8	00:00	 52k	3,969k	+0.54	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Rc3-c7 Rd7xc7
 9	00:00	 75k	4,391k	+0.61	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Kf2-g3 Rd7-b7 Kg3-g2
 10	00:00	 106k	5,292k	+0.56	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Kf2-g3 Rd7-b7 Rc3-c7 Rb7xc7
 11	00:00	 167k	6,411k	+0.56	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Kf2-g3 Re8-a8 Rc1-c2 Ra8-e8 Rc3-c7
 12	00:00	 274k	7,599k	+0.56	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Kf2-g3 Rd7-a7 e5-e6 Kf8-g8 f4-f5 Ra7-a8
 13	00:00	 572k	9,703k	+0.55	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd7-b7 Kf2-f3 Kf8-g8 Rc3-c7 Rd8-d7 Rc7xb7 Rd7xb7
 14	00:00	 1,946k	13,513k	+0.54	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Kf2-f3 Rd7-d8 Rc3-c7 Rd8-c8 Rc1-c2 Rc8xc7
 15	00:00	 2,760k	13,800k	+0.60	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-a8 Kf2-g3 Rd7-d8 Rc3-b3 Ra8-c8 Rc1xc8 Ne7xc8
 16	00:00	 4,852k	14,660k	+0.59	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Nd4-b5 Re8-a8 Nb5-d6 Kf8-g8 Rc3-c7 Ra8-a7
 17	00:00	 8,713k	15,368k	+0.70	d4-d5 c6xd5 e4-e5 Rd6-d7 Nb3-d4 Rd8-e8 Nd4-b5 Re8-a8 Nb5-d6 Kf8-g8 Rc3-c7 Ra8-a7
It probably is an evaluation thingy that Skipper can't find it, you temporary sacrifice a pawn to get a positional advantage.
This doesn't have to be a bug, it can be some missing features in your evaluation function.
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