Slowchess 2.9 can't seem to solve..

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MOBMAT
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Slowchess 2.9 can't seem to solve..

Post by MOBMAT »

I am processing some "mate in" problems and this one seemed to stump Slowchess.

I process using 6 engines simultaneously.
The engines are Crystal 200804,, MateFinder 10, The Huntsman 1, Stockfish Tactical, SlowChess 2.9, and Houdini 6.0. Each is running 1 thread, PV1, 3Gb of hash, withSyzygy 6-man TBs. The exception being Houdini which is using Nalimov 6-man and PV2 (it can usually find the second best move the fastest).
The test position is a mate in 17 according to every engine but SlowChess 2.9 which thinks it is a mate in 14.
[d]8/4p2P/8/2p5/p7/K7/2r5/k7 w - - 0 1
The winning line starts with 1.h8Q+ Kb1 2.Qh1+ Rc1 3.Qh7+ Rc2 4.Qe4
This is where SlowChess 2.9 goes off the rails. It believes 4... e5 is correct, while 4...e6 delays the mate by 3 moves.
Once I play out the moves and force 4....e6 to be played, SlowChess finds the correct line, but if I back up a move to 4. Qe4, it still thinks e5 is the best reply.
I am not sure who is supporting SlowChess (open source?), but perhaps whomever "they" are, they can move the engine forward by finding why it plays this move.
Unless there is a newer version that I don't have. If so, let me know and I'll try it.
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towforce
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Re: Slowchess 2.9 can't seem to solve..

Post by towforce »

Chess.com finds the mate without undue difficulty...

https://www.chess.com/analysis/game/pgn ... b=analysis
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chessica
Posts: 907
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Re: Slowchess 2.9 can't seem to solve..

Post by chessica »

[d]8/4p2P/8/2p5/p7/K7/2r5/k7 w - - 0 1

SlowChess Blitz Classic:

Code: Select all

 20/52	01:23,550	 284.489k	3.405k	+15,16	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 Kd3-d4 Ka3xa4 c5-c4 Ka4-b4 c4-c3 Dc1-f4+ Kd4-d5 Kb4xc3 e7-e5 Df4-f5 Kd5-d6 Kc3-c4 e5-e4 Df5xe4 Kd6-c7 Kc4-b5
 21/54+	02:14,930	 584.589k	4.333k	+M19	h7-h8D+
 21/54	03:09,160	 941.867k	4.979k	+M17	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e6-e5 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-e4 c5-c4 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-b4+ Kb1-a1 Db4-e1+ Tc2-c1 De1xc1+
 22/54	08:00,100	 2.854.966k	5.947k	+M17	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e6-e5 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-e4 c5-c4 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-b4+ Kb1-a1 Db4-e1+ Tc2-c1 De1xc1+
 23/54	16:57,360	 6.395.078k	6.286k	+M17	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e6-e5 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-e4 c5-c4 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-b4+ Kb1-a1 Db4-e1+ Tc2-c1 De1xc1+
Bester Zug: h7-h8D, Wert: +Matt in 17, Tiefe: 23/54, Dauer: 26:03,495, 6.395.078.414 Knoten, 6.286k
SlowChess Blitz 2.83 sse:

Code: Select all

 
 19/53	00:00,750	 6.471k	8.628k	+16,80	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-c4 Db2xc1+ Kc4-d5 Ka3xa4 c5-c4 Ka4-b5 Kd5-e6 Kb5-c6 Ke6-f6 Dc1xc4 Kf6-f5 Dc4-f7+ Kf5-e4 Df7xe7+ Ke4-f3 Kc6-b5 Kf3-f4 De7-e6 Kf4-f3 Kb5-c6 Kf3-f4 De6-e1 Kf4-f3 De1-d2 Kf3-g4 Dd2-e3 Kg4-f5 Kc6-d6 Kf5-g4 Kd6-e5 Kg4-h5 De3-f3+
 20/53+	00:00,820	 7.216k	8.800k	+22,68	h7-h8D+
 20/53+	00:00,840	 7.441k	8.859k	+M50	h7-h8D+
 20/53-	00:00,850	 7.526k	8.854k	+M250	h7-h8D+ Ka1-b1
 21/53	00:00,960	 8.520k	8.875k	+M41	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-c4 Db2xc1+ Kc4-d5 Ka3xa4 Kd5-c6 Dc1-h6+ Kc6-d5 Ka4-b5 c5-c4 Dh6-c1 c4-c3 Dc1xc3 e7-e6 Dc3-c4+ Kd5-e5 Kb5-c5 Ke5-f5 Kc5-c6 Kf5-e5 Kc6-d7 Ke5-f5 Dc4xe6+ Kf5-f4 Kd7-d6 Kf4-f3 Kd6-e5
 22/59	00:01,890	 16.610k	8.788k	+M30	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Dc1-d1+ Kd3-e3 Dd1-e1+ Ke3-d3 Ka3xa4 c4-c3 De1xe7 Kd3-d2 De7-c5 c3-c2 Dc5-d4+ Kd2-e1 Dd4-c3+ Ke1-f2 Dc3xc2+ Kf2-f3 Dc2-c4 Kf3-g2 Dc4-e4+ Kg2-g3 Ka4-b5 Kg3-f2 Kb5-c5 Kf2-g3 Kc5-c4 Kg3-f2 Kc4-d4 Kf2-g1 Kd4-e3 Kg1-h2
 23/59	00:03,020	 26.044k	8.624k	+M26	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Kb4xa4 e7-e5 Ka4-b5 Ke4-f4 Kb5-c4 e5-e4 Kc4-d4 Kf4-f5 Kd4-d5 Kf5-f4 Dc3-e5+ Kf4-f3 De5xe4+ Kf3-f2 Kd5-d4 Kf2-g3 Kd4-e3 Kg3-h2 Ke3-f3 Kh2-g1 De4-e2 Kg1-h1 De2-g2+
 24/59	00:03,080	 26.543k	8.618k	+M26	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Kb4xa4 e7-e5 Ka4-b5 Ke4-f4 Kb5-c4 e5-e4 Kc4-d4 Kf4-f5 Kd4-d5 Kf5-f4 Dc3-e5+ Kf4-f3 De5xe4+ Kf3-f2 Kd5-d4 Kf2-g3 Kd4-e3 Kg3-h2 Ke3-f3 Kh2-g1 De4-e2 Kg1-h1 De2-g2+
 25/59	00:03,530	 30.294k	8.582k	+M26	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Kb4xa4 e7-e6 Ka4-b4 Ke4-d5 Dc3-c4+ Kd5-e5 Kb4-c5 Ke5-f5 Kc5-d6 e6-e5 Kd6-d5 e5-e4 Dc4xe4+ Kf5-f6 De4-e6+ Kf6-g7 Kd5-e5 Kg7-h7 Ke5-f6 Kh7-h8 Kf6-f7 Kh8-h7 De6-h3+
 26/59	00:04,090	 34.754k	8.497k	+M26	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Kb4xa4 e7-e6 Ka4-b4 Ke4-d5 Dc3-c4+ Kd5-e5 Kb4-c5 Ke5-f5 Kc5-d6 e6-e5 Kd6-d5 e5-e4 Dc4xe4+ Kf5-f6 De4-e6+ Kf6-g7 Kd5-e5 Kg7-h7 Ke5-f6 Kh7-h8 Kf6-f7 Kh8-h7 De6-h3+
 27/59	00:05,000	 42.245k	8.449k	+M26	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Kb4xa4 e7-e6 Ka4-b4 Ke4-d5 Dc3-c4+ Kd5-e5 Kb4-c5 Ke5-f5 Kc5-d6 e6-e5 Kd6-d5 e5-e4 Dc4xe4+ Kf5-f6 De4-e6+ Kf6-g7 Kd5-e5 Kg7-h7 Ke5-f6 Kh7-h8 Kf6-f7 Kh8-h7 De6-h3+
 28/59	00:05,730	 48.497k	8.464k	+M26	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Dc1-d1+ Kd3-e3 Ka3xa4 c4-c3 Ka4-b4 c3-c2 Dd1xc2 Ke3-f4 Dc2-c4+ Kf4-f3 Dc4-f7+ Kf3-g2 Df7xe7 Kg2-f3 Kb4-c3 Kf3-f2 Kc3-d4 Kf2-g3 De7-e4 Kg3-f2 De4-g4 Kf2-e1 Dg4-g2 Ke1-d1 Kd4-d3 Kd1-e1 Dg2-e2+
 29/59	00:08,890	 75.087k	8.446k	+M25	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Dc3-e1+ Ke4-f5 De1xe7 a4-a3 Kb4xa3 Kf5-f4 Ka3-b4 Kf4-f5 Kb4-c4 Kf5-f4 Kc4-d4 Kf4-g3 De7-e4 Kg3-f2 De4-g4 Kf2-e1 Dg4-g2 Ke1-d1 Kd4-d3 Kd1-e1 Dg2-e2+
 30/59	00:10,920	 92.470k	8.468k	+M25	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Dc3-e1+ Ke4-f5 De1xe7 a4-a3 Kb4xa3 Kf5-f4 Ka3-b4 Kf4-f5 Kb4-c4 Kf5-f4 Kc4-d4 Kf4-g3 De7-e4 Kg3-f2 De4-g4 Kf2-e1 Dg4-g2 Ke1-d1 Kd4-d3 Kd1-e1 Dg2-e2+
 31/59	00:14,910	 133.893k	8.980k	+M25	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-e4+ Tc1-c2 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Dc3-e1+ Ke4-f5 De1xe7 a4-a3 Kb4xa3 Kf5-f4 Ka3-b4 Kf4-f5 Kb4-c4 Kf5-f4 Kc4-d4 Kf4-g3 De7-e4 Kg3-f2 De4-g4 Kf2-e1 Dg4-g2 Ke1-d1 Kd4-d3 Kd1-e1 Dg2-e2+
 32/59	00:21,250	 230.661k	10.855k	+M22	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-f3 e7-e6 Df3-d3+ Tc1-c2 Dd3-f1+ Tc2-c1 Df1-b5+ Kb1-c2 Db5-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3xa4 Kd3-d4 Ka4-b4 c4-c3 Dc1-d1+ Kd4-e4 Kb4xc3 Ke4-e5 Kc3-c4 Ke5-f5 Kc4-d4 Kf5-f4 Dd1-h5 e6-e5+ Dh5xe5+ Kf4-f3 De5-e4+ Kf3-f2 De4-g4 Kf2-e1 Dg4-g2 Ke1-d1 Kd4-d3 Kd1-e1 Dg2-e2+
 33/59	00:46,110	 615.453k	13.348k	+M19	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-f3 Kb1-c2 Df3-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Dc3-e1+ Ke4-f5 De1xe7 a4-a3 Kb4xa3 Kf5-f4 Ka3-b4 Kf4-f5 Kb4-c4 Kf5-f4 De7-f6+ Kf4-e3 Df6-f5 Ke3-e2 Kc4-d4 Ke2-d2 Df5-f2+ Kd2-d1 Kd4-d3 Kd1-c1 Df2-c2+
 34/59	00:51,820	 695.726k	13.426k	+M19	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-f3 Kb1-c2 Df3-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 c5-c4 Ka3-b4 c4-c3 Dc1xc3+ Kd3-e4 Dc3-e1+ Ke4-f5 De1xe7 a4-a3 Kb4xa3 Kf5-f4 Ka3-b4 Kf4-f5 Kb4-c4 Kf5-f4 De7-f6+ Kf4-e3 Df6-f5 Ke3-e2 Df5-f4 Ke2-d1 Kc4-d3 Kd1-e1 Df4-f7 Ke1-d1 Df7-f1+
 35/59	01:00,460	 820.391k	13.569k	+M17	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e6-e5 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-e4 c5-c4 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-b4+ Kb1-a1 Db4-e1+ Tc2-c1 De1xc1+

SlowChess Blitz 2.9 sse:

Code: Select all

 
 10/24	00:00,030	 32k	1.082k	+6,56	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e5 De4-h1+ Tc2-c1 Dh1-f3 e5-e4 Df3xe4+ Tc1-c2 De4-h1+ Tc2-c1 Dh1-f3 c5-c4 Df3-b7+ Kb1-c2 Db7-e4+ Kc2-d2 De4-d4+ Kd2-e2
 11/26+	00:00,130	 280k	2.151k	+7,66	h7-h8D+
 11/26+	00:00,130	 300k	2.308k	+9,86	h7-h8D+
 11/26	00:00,130	 309k	2.376k	+10,28	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-f3 Kb1-c2 Df3-e2+ Kc2-c3 De2-b2+ Kc3-c4 Db2xc1+ Kc4-d4 Dc1-d2+ Kd4-e4 Dd2-d1 Ke4-e5
 11/28	00:00,140	 372k	2.655k	+10,68	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-f3 Kb1-c2 Df3-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 e6-e5 Ka3xa4 c5-c4 Ka4-b4 c4-c3 Dc1-d1+ Kd3-e4 Dd1-g4+ Ke4-d5
 12/33	00:00,160	 534k	3.336k	+10,72	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-f3 Kb1-c2 Df3-e2+ Kc2-c3 De2-b2+ Kc3-d3 Db2xc1 e6-e5 Dc1-d1+ Kd3-e4 Ka3xa4 c5-c4 Ka4-b4 c4-c3 Dd1-g4+ Ke4-e3 Dg4-h3+ Ke3-f4 Dh3-h4+ Kf4-f5 Dh4-h7+
 13/33+	00:00,190	 702k	3.696k	+M17	h7-h8D+
 13/33	00:00,190	 706k	3.717k	+M17	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e6-e5 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-e4 c5-c4 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-b4+ Kb1-a1 Db4-e1+
 14/33	00:00,190	 722k	3.801k	+M17	h7-h8D+ Ka1-b1 Dh8-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e7-e6 De4-h1+ Tc2-c1 Dh1-h7+ Tc1-c2 Dh7-e4 e6-e5 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-d1+ Tc2-c1 Dd1-d3+ Tc1-c2 Dd3-e4 c5-c4 De4-e1+ Tc2-c1 De1-d2 Tc1-c2 Dd2-b4+ Kb1-a1 Db4-e1+ Tc2-c1 De1xc1+
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