Simple test position (mostly for weaker engines)

[muxecoid]

[d]r1N2rk1/p4p1p/2p3pB/1p1n4/8/1BP4P/PPQ2PPK/R3q3 b - - 1 22

How much time does your engine need to see that black can't take white rook?

[Edmund]

Glass finds it on depth 14. Thanks for the position!

Code: Select all

Glass 1.6 (512 mb hash):
   1	00:00	          14	437	+1.05	Dxa1
   2	00:00	          99	3.093	+1.05	Dxa1 Lxf8
   3	00:00	         363	11.343	+1.05	Dxa1 Lxf8 Kxf8
   4	00:00	       1.304	40.750	+0.98	Dxa1 Lxf8 Txc8 Ld6
   5	00:00	       3.219	68.489	+0.95	Dxa1 Lxf8 Kxf8 Sd6 Kg8
   6	00:00	       7.047	111.857	+1.01	Dxa1 Lxf8 Kxf8 Sd6 Td8 Lxd5
   7	00:00	      14.149	179.101	+1.01	Dxa1 Lxf8 Kxf8 Sd6 Td8 Lxd5 Txd6
   8	00:00	      38.212	222.162	+1.10	Dxa1 Lxf8 Kxf8 Sd6 Td8 Sb7 Td7 Sc5
   9	00:00	      83.720	254.468	+1.22	Dxa1 Lxf8 Kxf8 Sd6 De1 Se4 Kg8 Lxd5 cxd5
  10	00:00	     151.702	255.390	+1.29	Dxa1 Lxf8 Kxf8 Sd6 De1 Se4 Kg8 Lxd5 cxd5 Sd6
  11	00:01	     280.388	271.693	+1.16	Dxa1 Lxf8 Kxf8 Sd6 De1 Se4 Td8 Lxd5 Txd5 Sf6 Td1
  12	00:12	   3.674.386	304.196	+0.85	Dxa1 Lxd5 Taxc8 De4 cxd5 De5 f6 De6+ Kh8 De7 Tf7 Dxf7 Dxb2 Dxf6+ Kg8
  13	00:37	  11.577.573	306.690	-0.40	Dxa1 De2 Taxc8 De5 f6 Lxd5+ Tf7 De6 Tcf8 Dxc6 Td8 Lxf7+ Kxf7 Dc7+ Ke8 Dxh7
  14	02:00	  36.188.088	301.567	-5.26	Dxa1 De2 Dc1 Lxc1 Tfxc8 Lxd5 cxd5 Dxb5 d4 De5 dxc3 bxc3
  14	03:10	  50.945.232	266.772	-1.52	De5+ f4 Dc7 Lxf8 Kxf8 Sxa7 Txa7 g3 Sf6 Te1 Kg8 Dd3 Dd7 Dxd7 Txd7
  15	03:46	  59.706.037	264.112	-1.41	De5+ f4 Dc7 Lxf8 Kxf8 Sxa7 Txa7 g3 Sf6 Te1 Kg8 f5 g5 Dd2 h6 Dd4
  16	09:45	 121.164.990	207.047	-1.54	De5+ f4 Dc7 Lxf8 Kxf8 Sxa7 Txa7 g3 Db6 Te1 h6 Dd2 Td7 f5 Kg7

[metax]

ChessMind 0.80 is just happy to take the rook after 5 minutes of search:


r1N2rk1/p4p1p/2p3pB/1p1n4/8/1BP4P/PPQ2PPK/R3q3 b - -

Engine: ChessMind 0.80 (0 MB)
by metax

11/28 0:01 -1.58 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Nf6
5.Nxf6 Qe5+ 6.Kg1 Qxf6 7.Kf1 (274.527) 206

12/33 0:02 -1.55 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Nf6
5.Nxf6 Qe5+ 6.Kg1 Qxf6 7.a4 bxa4 (483.558) 207

13/34 0:05 -1.97 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.g3 Qe5
5.Ne4 Rd8 6.Bxd5 Rxd5 7.Kg2 Qc7 (1.263.961) 216

14/38 0:13 -1.91 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.g3 Qe5
5.Ne4 Rd8 6.Bxd5 Qxd5 7.a3 c5 8.Kg2 (2.873.886) 215

15/38 2:13 -1.73 1...Qxa1 2.Bxd5 Raxc8 3.Bxc6 Qxa2
4.Qe4 Qc4 5.Qe5 f6 6.Bd5+ Rf7 7.Bxc4 fxe5
8.Bxf7+ Kxf7 (30.047.820) 225

best move: Qe1xa1 time: 5:00.599 min n/s: 221.000 nodes: 66.151.349


For ChessMind 0.82 (current development version) my goal was to improve tactical vision a bit. That partly succeeded, although it still takes over 2 minutes to change to Qe5+:


Engine: ChessMind 0.82 (0 MB)
by metax

11/31 0:02 -1.92 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Rd8
5.Qd3 Qc1 6.Bxd5 Rxd5 (441.033) 206

11/31 0:02 -1.92 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Rd8
5.Qd3 Qc1 6.Bxd5 Rxd5 (448.740) 206

12/35 0:03 -1.85 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Rd8
5.a4 Nc7 6.axb5 Nxb5 7.g3 (750.885) 212

12/35 0:03 -1.85 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Rd8
5.a4 Nc7 6.axb5 Nxb5 7.g3 (759.253) 213

13/35 0:06 -1.95 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Rd8
5.a4 Re8 6.Bxd5 cxd5 7.Nc5 bxa4 (1.397.367) 219

13/35 0:06 -1.95 1...Qxa1 2.Bxf8 Kxf8 3.Nd6 Qe1 4.Ne4 Rd8
5.a4 Re8 6.Bxd5 cxd5 7.Nc5 bxa4 (1.419.747) 219

14/35 0:32 -1.35-- 1...Qxa1 2.Qe4 (7.299.873) 224

14/35 0:57 -0.15-- 1...Qxa1 2.Qe4 (12.754.879) 222

14/35 1:55 +2.25-- 1...Qxa1 2.Qe4 (25.051.179) 217

14/35 2:11 +1.94++ 1...Qe5+ (28.322.009) 214

14/35 2:22 +1.44++ 1...Qe5+ (30.544.069) 214

14/37 4:03 +0.69 1...Qe5+ (50.439.710) 207

14/37 4:06 +0.69 1...Qe5+ (51.102.703) 206

15/38 7:39 +0.91 1...Qe5+ 2.f4 Qc7 3.Bxf8 Kxf8 4.Bxd5 cxd5
5.Nxa7 Rxa7 6.Qd2 Ra4 7.Qxd5 Rxf4
8.Kh1 Rf5 9.Qb3 (92.772.180) 201