Test position, hard for Stockfish easy for others

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Kim Jensen

Test position, hard for Stockfish easy for others

Post by Kim Jensen »

Analysing my own games with Stockfish 1.7.1 zugzwang detection on, with 1024Mb hash and 2 threads(T2400 1.83Ghz) I found this position which seems easy for humans and most engines but hard for Stockfish

[D]3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 b - - 0 24

Bc3 is easy to spot for humans because it closes the 2 out of 3 open/semiopen files for rooks and controls e1 - giving black complete control with his rooks.

Stockfish needs alot of depth(at least 30 ply) before "seeing" this move, unfortunately Jose doesnt show the depth on the analysis lines.

-1,57 24...Tc8
-1,25 24...Tc8 25.Le3
-0,56 24...Tc8 25.Tbd1 Lb2 26.Txd5 Lxa3
-1,05 24...Tde8 25.Tbd1 T8e4
-0,96 24...Tde8 25.Tbd1 Le5 26.Lxe5 T8xe5
-0,56 24...Tde8 25.Tbd1 Lb2 26.Txd5 Lxa3
-0,92 24...Lc3 25.Tfd1 d4 26.Tbc1 Tde8
≤ -1,01 24...Lc3 25.Tfd1 d4 26.Tbc1 Tde8
-1,01 24...Lc3 25.Tfd1 d4 26.Tbc1 Tde8 27.b4
≥ -0,88 24...Lc3 25.Tfd1 d4 26.Kf1 Tde8 27.Le3
≥ -0,76 24...Lc3 25.Tfd1 d4 26.Kf1 Tde8 27.Le3
-0,80 24...Kg8 25.Tbc1 Lb2 26.Tce1 Txe1 27.Txe1 Lxa3 28.Kf1
≤ -1,05 24...Kg8 25.Tbc1 Tde8 26.Tc7 Txf2 27.Txf2 Te1#
-0,84 24...Kg8 25.Tbc1 Tde8 26.g3 a5 27.Tcd1 Lc5 28.Kg2 d4
≥ -0,68 24...Kg8 25.Tbc1 Tde8 26.g3 a5 27.Tcd1 Lc5 28.Kg2 d4 29.b4
≤ -1,01 24...Kh7 25.Tbd1 Lc3 26.Lc7 Tc8
-1,05 24...Kh7 25.Tbc1 a5 26.Tc6 Tde8 27.Le3 Lxe3 28.fxe3 T8xe3 29.Txb6
≥ -0,80 24...Kh7 25.Tbc1 a5 26.Tc6 Tde8 27.Le3 Lxe3 28.fxe3 T8xe3 29.Txb6
-0,92 24...Kh7 25.Tbc1 a5 26.Tc6 Tde8 27.Le3 Lxe3 28.fxe3 Te6 29.Tc3 T2xe3 30.Txe3 Txe3 31.Txf7 Txb3
-0,88 24...Kh7 25.Tbc1 a5 26.b4 Lb2 27.Tc7 Kg6 28.Td1 axb4 29.axb4 d4 30.Le3
≥ -0,76 24...Kh7 25.Tbc1 b5 26.Lg3 Lb2 27.Tc7
≤ -1,01 24...Kh7 25.Tbc1 f6 26.g3 g5 27.Le3 Lxe3 28.fxe3 Kg6 29.Tc6 Tf8 30.Tc3 Th8
-0,96 24...Kh7 25.Tbc1 f6 26.g3 g5 27.Le3 Lxe3 28.fxe3 Kg6 29.Tc6 Tf8 30.Tc3 Th8
≥ -0,84 24...Kh7 25.Tbc1 f6 26.g3 g5 27.Le3 Lxe3 28.fxe3 Kg6 29.Tc6 Tf8 30.Tc3 Th8 31.Tc6 Thxh2 32.Tfxf6+ Kg7 33.Tg6+
-1,01 24...Kh7 25.Tbc1 f6 26.g3 g5 27.Le3 Lxe3 28.fxe3 Kg6 29.Tc6 Tf8 30.Tf3 Ta2 31.a4
≥ -0,92 24...Kh7 25.Tbc1 Td7 26.Tc8 Lc5 27.b4 Ld4 28.g3 Tde7 29.Td8 Lb2 30.a4 d4 31.Td1
≥ -0,84 24...Kh7 25.g3 Kg6 26.Tbc1 Lb2 27.Tc6+ f6 28.Kg2 d4 29.a4 d3 30.Tc7 d2 31.Td1
-0,88 24...Kh7 25.g3 Lf6 26.Tfd1 g5 27.Td2 Te4 28.Lc7 Tc8 29.Tc1 Te7 30.Tdc2 Kg6 31.Kg2 d4 32.Kf3
-0,92 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 d3 28.Tfd1 Kg6 29.Kf3 Tc2 30.a4 Lc3 31.g4 Lb4 32.Ta1 a6 33.h5+ Kf6
≥ -0,80 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 d3 28.Tfd1 Kg6 29.Kf3 Tc2 30.a4 Lc3 31.g4 Lb4 32.Ta1 a6 33.h5+ Kf6 34.Le3
-0,92 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc2 28.Tfc1 d3 29.Td1 Kg6 30.Kf3 Kf5 31.b4 Kg6 32.Ke4 Tc3 33.a4 Te8+ 34.Kf3 d2+ 35.Kg2
≥ -0,84 24...Kh7 25.g3 Kg6 26.Kg2 Lb2 27.Tbe1 Txe1 28.Txe1 Lxa3 29.Ta1
-0,88 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc2 28.Tfc1 d3 29.Td1 Kg6 30.Kf3 Tc3 31.a4 Le7 32.Td2 Lb4 33.g4 Tc2 34.h5+ Kf6
≥ -0,80 24...Kh7 25.g3 Kg6 26.Kg2 Lb2 27.Tbe1 Txe1 28.Txe1 Lxa3 29.Ta1
≤ -0,96 24...Kh7 25.Tbd1 Lc3 26.Tc1 d4 27.Tfd1 Tde8 28.Kf1 Ta2
≥ -0,72 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Kg6 28.Kf3 Ta2 29.a4 d3 30.Tfd1 Tc2 31.Td2 Lc3 32.Txc2 dxc2 33.Tc1
-0,72 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Kg6 28.Kf3 Ta2 29.a4 d3 30.Tfd1 Tc2 31.Td2 Le5 32.Tbd1 Lxf4 33.Kxf4 Tc3 34.Ke3 Te8+ 35.Kd4
≤ -0,92 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Tfc1 Tc3 29.Lb8 a5 30.La7 Te6
-0,84 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Tec2 29.Kg4 T8c3 30.Ld6 Te2 31.f3 a5 32.Tfc1 Tee3 33.Txc3 dxc3 34.Td1 Le5 35.Lxe5 Txe5
≤ -1,05 24...Kh7 25.Tbc1 f6 26.Tc7 a5 27.h4 Lc5 28.h5 Lxa3 29.h6 Le7 30.Td1 d4 31.hxg7 Kxg7 32.Kf1 Te4 33.Le3 Kf7
-0,80 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 g6 31.Ld6 Kg7 32.Lb4 Tc6 33.Tbd1 Tb2 34.Td3 a5 35.Ld2 Tbc2
-0,84 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 g6 31.Lb8 d3 32.f4 a5 33.f5 Kg7 34.fxg6 fxg6 35.Ld6 Te2 36.b4 Tc4+ 37.Tf4 Ld4 38.Td1
≤ -0,92 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 g6 31.Lb8 a6 32.Ld6 Tc6 33.Lf4 Kg7 34.Ta1 Te2 35.Kf3 Tb2
≥ -0,76 24...Kh7 25.g3 Lb2 26.Tbe1 Tde8 27.Txe2 Txe2 28.a4 Kg6 29.Kg2 Kf5 30.Kf3
-0,76 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 g6 31.Lb8 a6 32.f4 Kg7 33.f5 Ta3 34.fxg6 fxg6 35.Tf3 d3 36.Tbf1 d2 37.T3f2 Tcxb3 38.Txd2 Txa4+ 39.Lf4
≤ -0,88 24...Kh7 25.Tbc1 f6 26.g3 Ta2 27.a4 Tb2 28.Tc7 a5 29.h4 Txb3 30.h5 Tb4 31.h6 Tg8
-0,80 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 Le7 33.Lxe7 Te4+ 34.Kg5 Txe7 35.Tfd1 d3 36.Kf4 Kg6 37.Td2 Te2
≤ -0,88 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 g6 33.Lb4 Tcc2 34.Tbd1 a5 35.Ld6 Tc6 36.Lf4 Tc3 37.Td2 Txd2 38.Lxd2 Txb3
≥ -0,72 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 g6 33.Lb4 Tcc2 34.Tbd1 a5 35.Ld6 Tc6 36.Lf4 Tc3 37.Td2 Txd2 38.Lxd2 Txb3
-0,80 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 g6 33.Lb4 Tcc2 34.f4 d3 35.f5 Le5 36.fxg6+ Kxg6 37.h5+ Kg7 38.Tbd1 Te4+ 39.Kf5 Txb4 40.Kxe5 Txb3
≤ -0,88 24...Kh7 25.h4 Lf6 26.g3 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 Te4+ 33.Kf5 Te6 34.Lb4 Tc2 35.Tbd1 a5 36.Ld2 Tb2 37.Lg5 Txb3 38.Lxf6 Txf6+ 39.Ke4 d3 40.Txd3 Te6+ 41.Kd4 Td6+
-0,80 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 Te4+ 33.Kf5 Te6 34.Lb4 Tc2 35.Tbd1 a5 36.Ld2 Tb2 37.Lg5 Txb3 38.Lxf6 Txf6+ 39.Ke4 Te6+ 40.Kxd4 Tb4+ 41.Kd5 Txa4
≤ -0,88 24...Kh7 25.h4 Lf6 26.g3 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 Te2 31.Lb8 a6 32.Ld6 Te4+ 33.Kf5 Te6 34.Lb4 Tc2 35.Tbd1 a5 36.Ld2 Tb2 37.Lg5 Txb3 38.Lxf6 Txf6+ 39.Ke4 d3 40.Txd3 Te6+ 41.Kd4 Td6+
-0,76 24...Kh7 25.g3 Lf6 26.Tfd1 g5 27.Ld2 d4 28.Tbc1 Kg6 29.Kg2 Td5 30.Kf3 Te6 31.Kg4 Le7 32.b4 f5+ 33.Kf3 g4+ 34.Kg2 Td7 35.h4 gxh3 e.p.+ 36.Kxh3 Lf6 37.Kg2 d3 38.Kf3 Lb2 39.Te1 Txe1 40.Txe1 Lxa3 41.Te6+ Kh5
≤ -0,84 24...Kh7 25.h4 Lf6 26.g3 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 a6 30.Kg4 g6 31.Ta1 Tb2 32.Tab1 Tcc2 33.Txb2 Txb2 34.Kf3 Txb3+ 35.Ke4 Tb2 36.Kd3 Kg7 37.Ld6 Kh6
-0,84 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Tec2 29.Kg4 T8c3 30.Ld6 Te2 31.Lb4 Tc6 32.Tbd1 Tb2 33.Tb1 Tcc2 34.f4 d3 35.Ld6 Tc6 36.Le5 Txb1 37.Txb1 Lxe5 38.fxe5 Kg6 39.h5+ Kh6
≥ -0,72 24...Kh7 25.g3 Ta2 26.a4 Lc5 27.Tbd1 d4 28.Td3 Kg6
-0,72 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Tec2 29.Kg4 T8c3 30.Ld6 Te2 31.Lb4 Tc6 32.Tbd1 Tcc2 33.f4 a5 34.Ld6 Tc3 35.Le5 Lxe5 36.fxe5 Te4+ 37.Tf4 Txf4+ 38.gxf4 Txb3 39.Txd4 Txa3 40.Td7
≤ -0,88 24...Kh7 25.h4 Lf6 26.g3 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.Tbc1 Tc3+ 30.Txc3 dxc3 31.a4 Kg6
-0,88 24...Kh7 25.g3 Lf6 26.h4 d4 27.Kg2 Tc8 28.Kf3 Ta2 29.a4 Tc3+ 30.Kg4 g6 31.a5 Kg7 32.axb6 axb6 33.b4 Tc4 34.b5 Tc3 35.Tbd1 Tb3 36.Td2 Txd2 37.Lxd2 Txb5 38.Kf3 Tb2 39.Ke2 Ta2 40.Tb1
≥ -0,64 24...Kh7 25.g3 Ta2 26.Tbd1 Lf6 27.a4 d4 28.h4 Kg6
-0,88 24...Lc3 25.Tfd1 d4 26.g3 Tde8 27.Kg2 Kh7 28.Kf3 Ta2 29.a4 Tee2 30.Tf1 Kg6 31.h4 Tab2 32.Tbc1 f5 33.Lg5 Ta2 34.Lf4 Te8 35.Tcd1 Kf7 36.Tb1 Kf6 37.h5 Ke6 38.Tfd1 Th8 39.Th1 Tc2 40.Tbg1 Tb2
≥ -0,80 24...Lc3 25.g3 Tde8 26.Kg2 d4 27.Kf3 Kh7 28.h4 d3 29.Tbc1 Ld4 30.Tcd1
≤ -0,96 24...Lc3 25.g3 Tde8 26.Kg2 Ta2 27.Ld6 d4 28.Tbc1 Tb2 29.b4 Kh7 30.Kf3 Ta2
-0,88 24...Lc3 25.g3 Tde8 26.Kg2 Ta2 27.a4 f5 28.h3 Kh7 29.Kf3 Kg6 30.g4 Th8 31.Th1 Tc2 32.g5 Ld4 33.Tbd1 Txf2+ 34.Kg3 Lc5 35.b4 Th4 36.Kxh4 Txf4+ 37.Kg3 Txb4 38.Txd5 Kxg5 39.a5 Tb3+ 40.Kg2 g6 41.axb6 axb6 42.Tc1 Kf6 43.Tcd1 g5 44.Ta1
≤ -0,96 24...Lc3 25.h4 d4 26.Kh2 d3 27.Kg3 d2 28.Tfd1 Kh7 29.Kf3 Te1
≤ -1,05 24...Lc3 25.g3 Tde8 26.a4 Ta2 27.h3 Kh7 28.Tbd1 d4 29.Kg2
-1,01 24...Lc3 25.g3 Tde8 26.a4 Ta2 27.h3 Kh7 28.Kg2 f5 29.Kf3 Kg6 30.Tfd1 d4 31.g4 Th8 32.Th1 Tc2 33.Tbg1 d3 34.h4 fxg4+ 35.Txg4+ Kf5 36.Td1 Txf2+ 37.Kxf2 Kxg4 38.Txd3 Kxf4 39.Txc3 Txh4 40.Kg2 Kf5 41.Tc7 Tg4+ 42.Kf2 a5 43.Tf7+ Ke6 44.Tc7 Kd6 45.Kf3 Kxc7 46.Kxg4
≥ -0,88 24...Lc3 25.g3 Ta2 26.a4
≥ -0,76 24...Lc3 25.g3 Tde8 26.Kg2 Ta2 27.a4
-0,80 24...Lc3 25.g3 Ta2 26.a4 Te8 27.Kg2 f5 28.h3 d4 29.g4 Kh7 30.Kf3 Tf8 31.Th1 fxg4+ 32.hxg4+ Kg8 33.Kg3 Te2 34.Tbd1 Tb2 35.Le5 Tbxf2 36.Td3 Tb2 37.Lxd4 Lxd4 38.Txd4 Txb3+ 39.Kh4 a5 40.Tc1 Tb4 41.Tcc4 Txc4 42.Txc4 Kf7 43.Tc6 Tb8 44.Tc7+ Kf6 45.g5+ Kg6 46.Kg4 b5
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metax
Posts: 344
Joined: Wed Sep 23, 2009 5:56 pm
Location: Germany

Re: Test position, hard for Stockfish easy for others

Post by metax »

Even my weak engine gets this instantly... :shock:


3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 b - -

Engine: ChessMind 0.72 (0 MB)
by metax

10/20 0:00 -1.64 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be3 Rxa3
5.b4 a6 6.Ke2 (131.372) 173

11/20 0:01 -1.73 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rd5
5.Bg3 Rc5 6.Rdc1 Rxa3 (346.143) 196

12/21 0:02 -1.81 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rd5
5.Bg3 Rc5 6.Rdc1 Rxa3 7.Rc2 (583.074) 203

13/22 0:04 -1.84 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rxa3
5.Rd3 Ra5 6.Rh3+ Kg8 7.Rxc3 dxc3
8.Bxc3 (942.242) 206

14/24 0:07 -1.92 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rxa3
5.Rd3 Ra5 6.Rh3+ Kg8 7.Rd1 Rxe5
8.Rxc3 dxc3 (1.527.895) 209

15/26 0:11 -1.92 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rxa3
5.Rd3 Ra5 6.Rh3+ Kg8 7.Rd1 Rxe5
8.Rxc3 dxc3 (2.454.705) 211

16/28 0:24 -1.85 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rxa3
5.Rd3 Ra5 6.Rh3+ Kg8 7.Rd1 Rxe5
8.Rxc3 dxc3 9.Rxd8+ (5.349.401) 214

17/32 0:51 -1.75 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Be5 Rxa3
5.Rd3 Ra5 6.Rh3+ Kg8 7.Rd1 Rxe5
8.Rxc3 a6 9.Rc7 Rc5 10.Rc1 (11.129.767) 216

best move: Bd4-c3 time: 0:58.844 min n/s: 217.000 nodes: 12.600.385


Even though the score seems a bit exaggerated... :?
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Kurt Utzinger
Posts: 169
Joined: Sun May 11, 2008 10:31 pm
Location: Switzerland

Re: Test position, hard for Stockfish easy for others

Post by Kurt Utzinger »

FEN: 3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 w - - 0 24

Ruffian 1.0.5:
1/1 00:00 2 0 +0.90 Lc3 Tbd1 d4
1/1 00:00 3 0 +1.04 Tde8
2/5 00:00 149 0 +0.78 Tde8 Tbc1 Lc5 b4 Ld4 Tc7
2/5 00:00 180 0 +0.80 Tc8 Tbc1 Txc1 Lxc1
2/5 00:00 290 0 +1.09 Lc3 Tbd1 d4
3/7 00:00 1.337 0 +1.09 Lc3 Tbd1 d4
4/7 00:00 1.678 0 +1.09 Lc3 Tbd1 d4
5/7 00:00 2.098 0 +1.09 Lc3 Tbd1 d4
6/8 00:00 3.420 0 +1.09 Lc3 Tbd1 d4
7/9 00:00 4.740 0 +1.09 Lc3 Tbd1 d4
8/12 00:00 10.597 0 +1.09 Lc3 Tbd1 d4
9/14 00:00 18.026 1.802.600 +1.09 Lc3 Tbd1 d4
10/15 00:00 36.067 3.606.700 +1.09 Lc3 Tbd1 d4
11/16 00:00 77.027 2.567.566 +1.09 Lc3 Tbd1 d4
12/17 00:00 159.607 2.660.116 +1.09 Lc3 Tbd1 d4
13/18 00:00 321.384 2.472.184 +1.09 Lc3 Tbd1 d4
14/27 00:03 8.768.027 2.338.140 +1.07 Lc3 Tbd1 d4 Tc1 Ta2 Lc7 Td7
15/29 00:46 106.983.910 2.280.134 +1.21 Lc3 a4 d4 Tfd1 Tde8 Kf1 Ta2 Td3 Tee2 Lg3 Kg8 Tc1 Teb2 b4 Txb4
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Kurt Utzinger
Posts: 169
Joined: Sun May 11, 2008 10:31 pm
Location: Switzerland

Re: Test position, hard for Stockfish easy for others

Post by Kurt Utzinger »

FEN: 3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 w - - 0 24

Hermann2513:
1/5 00:00 40 5.000 +0.50 Lc3 Tbc1 d4 Tfd1
3/5 00:00 200 22.222 +0.50 Lc3 Tbc1 d4 Tfd1 Tde8
5/10 00:00 1.508 137.091 +0.48 Lc3 Tbc1 d4 Tfd1 Tde8
5/13+ 00:00 8.444 527.750 +0.48 Lb2 Lg5 Tc8 f3
5/13 00:00 14.680 734.000 +0.53 Lb2 a4 d4 Lc7 Tde8 f3
6/13 00:00 18.332 797.043 +0.50 Lb2 a4 d4 Lc7 Tde8 f3
7/15 00:00 68.360 1.035.758 +0.60 Lb2 a4 d4 Lc7 Td7 Le5 Lc3
8/16 00:00 148.624 1.069.237 +0.21 Lb2 Tbe1 Tee8 Txe8+ Txe8 a4 d4 Td1 d3 Le3
8/16+ 00:00 161.468 1.076.453 +0.22 Lc3 Lc7 Tc8 Tfc1 Txc7 Kf1 Tee7 Txc3
8/17 00:00 321.160 1.321.646 +0.46 Lc3 Tbc1 d4 f3 Tb2 b4 Ta2 Lc7
8/17+ 00:00 409.228 1.359.561 +0.46 f6 Tbd1 Lc3 f3 Ta2 Lg5
8/17 00:00 501.928 1.405.961 +0.51 f6 Tbc1 Ta2 Lc7 Td7 a4 Tb2 Tcd1
9/21 00:00 1.166.532 1.668.858 +0.46 f6 h4 Lc3 Tbc1 d4 Tfd1 Tde8 h5 Kg8 Td3
9/21+ 00:00 1.166.536 1.657.011 +0.46 Lc3 Tbc1 d4 Tfd1 Tde8 g3 f6 Td3 g5 Ld6
9/21 00:00 1.216.628 1.646.317 +0.54 Lc3 Tbc1 d4 Tfd1 Tde8 g3 f6 Td3 g5 Ld6
10/22 00:01 1.956.244 1.762.382 +0.53 Lc3 Tfd1 d4 Td3 Tde8 h3 g6 Tc1 Kg7 b4 b5
11/24 00:01 2.782.360 1.784.708 +0.56 Lc3 Tfd1 d4 Td3 Tde8 h4 g6 Tc1 Kg7 g3 f6 b4
12/24 00:02 3.904.324 1.802.550 +0.55 Lc3 Tfd1 d4 Td3 Tde8 h4 g6 Tc1 Kg7 f3 f6 a4 Tb2
13/27 00:03 6.940.864 1.893.307 +0.54 Lc3 Tfd1 d4 Td3 Tde8 h4 g6 Ld6 Tc2 b4 Kg7 b5 f6 Tbd1
14/29 00:07 15.462.504 1.973.013 +0.57 Lc3 Tfd1 d4 Td3 Tde8 h4 g6 g3 Le1 Tf3 Kg7 Tc1 Lc3 Td3
15/32 00:14 29.173.092 2.014.855 +0.56 Lc3 Tfd1 d4 Td3 Tde8 h4 g6 f3 Kg7 g4 f6 h5 g5 Ld6 T8e3 Txe3 dxe3
16/33 00:38 80.240.512 2.071.311 +0.61 Lc3 Tfd1 d4 Td3 Tde8 h4 f6 Ld6 Ta2 Lb4 Lxb4 axb4 Tee2 Tf1 Te4 h5 Tf4 Tg3
17/35 00:55 115.235.732 2.069.310 +0.61 Lc3 Tfd1 d4 Td3 Tde8 h4 f6 Ld6 Ta2 Lb4 Tc2 Ld6 Ta2 Lb4
18/35 02:10 273.763.976 2.105.893 +0.63 Lc3 Tfd1 d4 Td3 Tde8 g4 f6 Ld6 Ta2 Lb4 Tc2 Ld6 Ta2 Lb4
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F. Bluemers
Posts: 868
Joined: Thu Mar 09, 2006 11:21 pm
Location: Nederland

Re: Test position, hard for Stockfish easy for others

Post by F. Bluemers »

Kim Jensen wrote:Analysing my own games with Stockfish 1.7.1 zugzwang detection on, with 1024Mb hash and 2 threads(T2400 1.83Ghz) I found this position which seems easy for humans and most engines but hard for Stockfish

[D]3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 b - - 0 24

Bc3 is easy to spot for humans because it closes the 2 out of 3 open/semiopen files for rooks and controls e1 - giving black complete control with his rooks.

Stockfish needs alot of depth(at least 30 ply) before "seeing" this move, unfortunately Jose doesnt show the depth on the analysis lines.
well,not that obvious imo,as black gives up pressure on f2

Code: Select all


3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 b - -
           +---+---+---+---+---+---+---+---+
         8 |   |:::|   |*T*|   |:::|   |*K*
           +---+---+---+---+---+---+---+---+
         7 |*p*|   |:::|   |:::|*p*|*p*|   
           +---+---+---+---+---+---+---+---+
         6 |   |*p*|   |:::|   |:::|   |:::
           +---+---+---+---+---+---+---+---+
         5 |:::|   |:::|*p*|:::|   |:::|   
           +---+---+---+---+---+---+---+---+
         4 |   |:::|   |*L*|   | L |   |:::
           +---+---+---+---+---+---+---+---+
         3 | p | p |:::|   |:::|   |:::|   
           +---+---+---+---+---+---+---+---+
         2 |   |:::|   |:::|*T*| p | p | p 
           +---+---+---+---+---+---+---+---+
         1 |:::| T |:::|   |:::| T | K |   
           +---+---+---+---+---+---+---+---+
             a   b   c   d   e   f   g   h
Shredder 9 UCI
-----
 12	 0:01 	+1.26 	1...Lc3 2.g3 d4 3.Kg2 d3 4.Tfd1 d2 5.h4 Kg8 6.Kf3 Tde8 7.Le3 (1.638.662) 921
 12	 0:00 	+1.09 	1...Kh7 2.h3 (456.810) 943
-----
 13	 0:02 	+1.07 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kg8 5.h3 Te8 6.Kf3 Tee2 7.Tbd1 Tab2 (2.297.282) 920
LT:  12	 0:00 	+1.09 	1...Kh7 2.h3 (456.810) 943
-----
 13	 0:02 	+1.09 	1...Kh7 2.h3 (2.297.283) 920
 13	 0:02 	+1.07 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kg8 5.h3 Te8 6.Kf3 Tee2 7.Tbd1 Tab2 (2.297.282) 920
-----
 14	 0:02 	+1.09 	1...Kh7 2.h3 (2.510.873) 924
LT:  13	 0:02 	+1.07 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kg8 5.h3 Te8 6.Kf3 Tee2 7.Tbd1 Tab2 (2.297.282) 920
-----
 14	 0:03 	+1.15 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kg8 5.Kf3 Te8 6.h4 Tee2 7.Tbd1 Teb2 8.Ke4 (2.991.582) 926
 14	 0:02 	+1.09 	1...Kh7 2.h3 (2.510.873) 924
-----
 15	 0:04 	+1.11 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kg8 5.Kf3 Te8 6.h4 Tee2 7.Tbd1 Teb2 8.Tb1 Tc2 (4.089.833) 929
LT:  14	 0:02 	+1.09 	1...Kh7 2.h3 (2.510.873) 924
-----
 15	 0:04 	+1.11 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kg8 5.Kf3 Te8 6.h4 Tee2 7.Tbd1 Teb2 8.Tb1 Tc2 (4.089.833) 929
 15	 0:04 	+1.09 	1...Kh7 2.h3 (4.089.834) 929
-----
 16	 0:07 	+1.15 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Te8 5.g4 Tee2 6.h4 Kh7 7.Tbd1 Kg6 8.h5+ Kf6 9.Kf3 Tab2 (6.831.244) 935
LT:  15	 0:04 	+1.09 	1...Kh7 2.h3 (4.089.834) 929
-----
 16	 0:07 	+1.15 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Te8 5.g4 Tee2 6.h4 Kh7 7.Tbd1 Kg6 8.h5+ Kf6 9.Kf3 Tab2 (6.831.244) 935
 16	 0:15 	+1.14 	1...Kh7 2.Tbc1 Kg6 3.Tc7 Tde8 (14.425.680) 919
-----
 17	 0:21 	+1.16 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Te8 5.g4 Tee2 6.h4 Kg8 7.Kf3 a6 8.b4 (19.691.314) 917
LT:  16	 0:15 	+1.14 	1...Kh7 2.Tbc1 Kg6 3.Tc7 Tde8 (14.425.680) 919
-----
 17	 0:21 	+1.16 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Te8 5.g4 Tee2 6.h4 Kg8 7.Kf3 a6 8.b4 (19.691.314) 917
 17	 0:46 	+1.14 	1...Kh7 2.h3 Lc3 3.g4 Kg6 (42.917.920) 913
-----
 18	 1:03 	+1.21 	1...Lc3 2.g3 d4 3.Kg2 Ta2 4.a4 Kh7 5.Kf3 Te8 6.Tbd1 Kg6 7.h4 Tee2 8.g4 Teb2 9.Ke4 (57.937.578) 916
LT:  17	 0:46 	+1.14 	1...Kh7 2.h3 Lc3 3.g4 Kg6 (42.917.920) 913
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Kim Jensen

Re: Test position, hard for Stockfish easy for others

Post by Kim Jensen »

well it may be a little high, but I think its very close to winning for black because white have no active play.

but great to see your engine gets it :)
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Kim Jensen

Re: Test position, hard for Stockfish easy for others

Post by Kim Jensen »

Well it gives up pressure but gains total control of 2 files and makes black the only one having active rooks that can penetrate to second rank.

So I think its kind of obvious, but maybe its a transformation of advantages thing.
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Richard Allbert
Posts: 792
Joined: Wed Jul 19, 2006 9:58 am

Re: Test position, hard for Stockfish easy for others

Post by Richard Allbert »

Even really weak engines can get this... :D :D

Code: Select all

id name Jabba 1.3

id author Richard Allbert

option name Hash type spin default 32 min 16 max 1024
option name Ponder type check default false
option name OwnBook type check default false
option name UCI_Chess960 type check default false
option name ClearHash type button
option name UseFutility1 type check default true
option name UseFutility2 type check default true
option name Fultility1Margin type spin default 50 min 0 max 500
option name Fultility2Margin type spin default 500 min 0 max 20000
option name SearchNullmove type check default true
option name SearchIID type check default true
option name HashTableCuts type check default true
uciok
position fen 3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 b - -
go infinite
info depth 2 seldepth 5 score cp 58  time 0 nodes 330 pv  d8c8 b1e1
info depth 3 seldepth 7 score cp 32  time 16 nodes 3097 pv  h8g8 b1d1 d4c5
info depth 4 seldepth 8 score cp 50  time 31 nodes 6819 pv  h8g8 b1c1 d4c5 b3b4
info depth 5 seldepth 11 score cp 31  time 78 nodes 19152 pv  h8g8 b1d1 e2e4 g2g
3 d8c8
info depth 6 seldepth 13 score cp 39  time 172 nodes 65971 pv  h8g8 b1c1 d8e8 c1
c7 a7a6 f4e3
info depth 7 seldepth 14 score cp 29  time 390 nodes 187489 pv  h8g8 b1d1 e2e4 g
2g3 d8e8 h2h3 a7a6
info depth 8 seldepth 15 score cp 36  time 608 nodes 300615 pv  h8g8 b1d1 e2e4 f
4d2 d4c5 b3b4 c5d4 f1e1
info depth 9 seldepth 18 score cp 28  time 2044 nodes 1119437 pv  d4c3 b1d1 d5d4
 d1d3 d8e8 h2h3 h8g8 f1c1
info depth 10 seldepth 18 score cp 34  time 3323 nodes 1830306 pv  d4c3 b1d1 d5d
4 d1d3 d8e8 d3h3 h8g8 h3d3 e2c2 f1d1 e8e2
info depth 11 seldepth 21 score cp 31  time 12527 nodes 7052005 pv  d4c3 f1d1 d5
d4 b1c1 d8e8 h2h3 h8g8 f2f3 b6b5 f4d6 a7a5
info depth 12 seldepth 22 score cp 45  time 32495 nodes 18315750 pv  d4c3 a3a4 d
5d4 b1c1 d8e8 f2f3 e2b2 c1b1 e8e2 b1b2 e2b2 f1c1
stop

nulltry 2662015 nullcuts 1932062 57.9445%
futility 1 7826920 futility 2 701314
hashcuts 639569
fh 213827 fhf 2682162 ordering  92.6164%
nodes 6310715 qnodes 13558984  68.2395%
qcuts 3542941
checkext = 514420 pawnseventh = 103 intopawnend = 21
pvssearch = 9246888 pvsresearch = 216117 2.33719%

bestmove d4c3
Doesn't give a "winning" score though..

Regards

Richard
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F. Bluemers
Posts: 868
Joined: Thu Mar 09, 2006 11:21 pm
Location: Nederland

Re: Test position, hard for Stockfish easy for others

Post by F. Bluemers »

Kim Jensen wrote:Well it gives up pressure but gains total control of 2 files and makes black the only one having active rooks that can penetrate to second rank.

So I think its kind of obvious, but maybe its a transformation of advantages thing.
Well,white cannot move a rook to e1 due to Bxf2.
shredder still does not show a big eval diff between the moves

Code: Select all

21	 7:45 	+1.15 	1...Lc3 2.g3 Ta2 3.a4 Kh7 4.g4 Te8 5.Kg2 d4 6.Kf3 Tee2 7.h4 a6 8.h5 b5 9.axb5 axb5 (422.342.891) 907
 21	12:58 	+1.15 	1...Kh7 2.g3 Lc3 3.a4 Ta2 4.g4 Te8 5.Kg2 d4 6.Kf3 Tee2 7.h4 a6 8.h5 (705.639.366) 906
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: Test position, hard for Stockfish easy for others

Post by kgburcham »

6 core Xeon@4gig

[D] 3r3k/p4pp1/1p6/3p4/3b1B2/PP6/4rPPP/1R3RK1 b - -

Stockfish 1.7 JA 64bit

19.01 0:01 -0.84-- 1...Kh7 2.g3 Bc3 3.Kg2 d4 4.Rfd1 Kg6 5.g4 d3 6.Kf3 Ree8 7.b4 (9.331.644) 6801
19.01 0:01 -0.76-- 1...Kh7 2.g3 Kg6 3.Kg2 Bb2 4.a4 d4 5.h4 d3 6.Rfd1 Rc2 7.g4 Bc3 8.h5+ Kf6 9.Rbc1 Rxc1 10.Rxc1 (12.901.589) 7453
19.01 0:02 -0.72 1...Kh7 2.g3 Kg6 3.Kg2 Bb2 4.a4 d4 5.h4 d3 6.Rfd1 Bf6 7.Kf3 Rc2 8.b4 Rc3 9.Kg4 Rd5 10.Kf3 Ra3 11.Ke4 Rd4+ 12.Ke3 Rxa4 13.Rxd3 Raxb4 14.Rxb4 Rxb4 (18.955.985) 8213
20.01 0:05 -0.80 1...Kh7 2.g3 Bf6 3.h4 Kg6 4.Kg2 d4 5.Kf3 d3 6.Rfd1 Rc2 7.a4 Be7 8.b4 Rc3 9.Ke3 Bf6 10.a5 Re8+ 11.Kf3 Bd8 12.Bd2 Rc2 (50.000.828) 9893
21.01 0:05 -0.76 1...Kh7 2.g3 Bf6 3.h4 Kg6 4.Kg2 d4 5.Kf3 d3 6.Rfd1 Rc2 7.a4 Be7 8.b4 Rc4 9.Rb3 Bxb4 10.Rbxd3 Rxd3+ 11.Rxd3 Bc5 12.Be3 Bxe3 13.Kxe3 Rxa4 (53.441.639) 9902
22.01 0:06 -0.84++ 1...Kh7 2.h4 Kg6 3.g3 Bf6 4.Kg2 d4 5.Kf3 d3 6.Rfd1 Rc2 7.a4 Be7 8.b4 Rc4 9.Rb3 Rxb4 10.Rbxd3 Rxd3+ 11.Rxd3 Rxa4 12.Rd7 Bc5 13.Be5 Ra2 (65.338.394) 10142
22.01 0:07 -0.92++ 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Rec2 6.Kg4 R8c3 7.f3 g6 8.Bb8 a6 9.Ba7 Bd8 (75.812.015) 10296
22.01 0:08 -0.96 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.Bd6 d3 9.Rfd1 Re6 10.Bf4 Bd4 11.Rd2 Kg6 12.h5+ Kf6 13.Kf3 Re8 (83.281.198) 10366
23.01 0:09 -0.72-- 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.Bd6 d3 9.Rfd1 Re6 10.Bf4 Bd4 11.Rd2 Kg6 12.h5+ Kf6 13.Kf3 Re8 14.Rbd1 (98.877.010) 10390
23.01 0:11 -0.80 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.b4 g6 9.Rbe1 Ra2 10.Ra1 Rac2 11.Rad1 d3 12.Kf3 Bd4 13.Be3 Be5 14.Rfe1 d2 (119.474.490) 10491
24.01 0:12 -0.80 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.b4 g6 9.Rbe1 Ra2 10.Ra1 Rac2 11.Rad1 Rc4 12.Rd2 R2c3 13.Rb1 Ra3 14.a5 bxa5 (129.459.318) 10544
25.01 0:14 -0.88++ 1...Kh7 2.Rbc1 Rd7 3.Rcd1 Bc3 4.g3 d4 5.Kg2 Kg6 6.Kf3 Rde7 7.Be3 Rb2 (149.899.199) 10629
25.01 0:14 -0.80 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.b4 g6 9.Rbe1 Rxe1 10.Rxe1 Ra3 11.Rc1 Kg7 12.b5 Rxa4 13.Kf3 Ra5 14.Rc7 Ra2 (156.974.932) 10659
26.01 0:18 -0.88++ 1...Kh7 2.Rbc1 Rd7 3.Rcd1 Bc3 4.g3 d4 5.Kg2 Kg6 6.Kf3 Rde7 7.Be3 Rb2 (199.960.749) 10735
26.01 0:20 -0.80 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.b4 g6 9.Rbe1 Rec2 10.Rd1 Rc4 11.Rd2 R2c3 12.Rb1 Ra3 13.a5 bxa5 14.bxa5 Rxa5 (216.102.266) 10763
27.01 0:25 -0.88++ 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.b4 g6 9.Rbe1 Rec2 10.Rd1 Rc4 11.Rd2 R2c3 12.Rb1 Ra3 13.a5 bxa5 14.bxa5 Rxa5 (276.203.107) 10822
27.01 0:27 -0.88 1...Kh7 2.g3 Bf6 3.h4 d4 4.Kg2 Rc8 5.Kf3 Ra2 6.a4 Rc3+ 7.Kg4 Re2 8.b4 g6 9.Rbe1 Rec2 10.Rd1 Rc4 11.Rd2 R2c3 12.Rb1 Ra3 13.a5 bxa5 14.bxa5 Rxa5 (295.047.327) 10838
28.01 0:44 -0.80-- 1...Kh7 2.g3 Bc3 3.h4 d4 4.Kg2 d3 5.Kf3 (492.826.859) 10958
28.01 1:06 -0.72-- 1...Kh7 2.g3 Bc3 3.Kg2 d4 4.Kf3 Ra2 5.a4 Kg6 6.h4 d3 7.Rfd1 (732.758.327) 10956
28.03 1:21 -0.92 1...Bc3 2.g3 Rde8 3.Kg2 f5 4.Rfd1 d4 5.h4 Ra2 6.a4 Kh7 7.h5 Kg8 8.Rd3 Ree2 9.Rf1 Rab2 10.Bb8 Rxb3 11.Bxa7 Ra2 12.Bb8 Rxa4 13.Kf3 Rb5 14.Kf4 Raa5 (891.373.632) 10988
29.01 1:30 -0.84-- 1...Bc3 2.g3 Rde8 3.Kg2 f5 4.a4 d4 5.Kf3 Kh7 6.h4 Kg6 7.Rh1 Be1 8.h5+ Kf7 9.Rf1 Bc3 10.Rh1 d3 11.Be3 (1.001.217.313) 11025
29.01 1:57 -0.76-- 1...Bc3 2.g3 Ra2 3.a4 d4 4.Kg2 d3 5.Kf3 Kh7 6.Rfd1 Re2 7.Rxd3 (1.290.633.694) 11023
29.01 2:35 -0.88 1...Bc3 2.g3 Ra2 3.a4 d4 4.Kg2 f5 5.Kf3 Kh7 6.Rg1 Rd7 7.h3 Kg6 8.Rbc1 Kf6 9.h4 Kf7 10.h5 Re7 11.Bb8 a6 12.Rgf1 b5 13.Bd6 Re6 14.Bc5 bxa4 (1.713.475.647) 11047
30.01 2:48 -0.80-- 1...Bc3 2.g3 Rde8 3.Rfd1 d4 4.Kg2 Ra2 5.a4 Kg8 6.g4 Ree2 7.Bg3 f6 8.h4 Kf7 9.h5 Ke6 10.Kf3 Kd5 11.Rbc1 Kc5 12.Rb1 Rac2 13.Rbc1 Rb2 14.Rh1 Re6 (1.858.538.167) 11047
30.01 3:09 -0.80 1...Bc3 2.g3 Ra2 3.a4 Kh7 4.h4 d4 5.Kg2 f5 6.h5 Kg8 7.Rh1 Re8 8.Kf3 Ree2 9.Rhf1 Kf7 10.Bb8 Re7 11.Rbc1 Kf6 12.Rh1 Ree2 13.Rhf1 a6 14.Rcd1 Reb2 (2.092.874.339) 11059
31.01 3:48 -0.88 1...Bc3 2.g3 Ra2 3.a4 Kh7 4.h4 d4 5.Kg2 f5 6.h5 Kg8 7.Rh1 Re8 8.Kf3 Ree2 9.Rhf1 Kf7 10.Bb8 Re7 11.Rbc1 Kf6 12.Rh1 Ree2 13.Rhf1 a6 14.Rcd1 Re8 (2.525.381.946) 11074
32.01 6:25 -0.76-- 1...Bc3 2.g3 Rde8 3.Rfd1 d4 (4.308.614.171) 11165
32.01 9:31 -1.01++ 1...Bc3 2.Rfd1 d4 3.Kf1 Ra2 4.Rbc1 Re8 5.Bd6 Ree2 (6.404.555.183) 11207
32.01 11:44 -0.96 1...Bc3 2.g3 d4 3.Kg2 f5 4.Kf3 Rde8 5.a4 Rc2 6.h3 Kh7 7.g4 Rf8 8.g5 Kg6 9.h4 Re8 10.Rh1 Kh5 11.Rhc1 Ra2 12.Rg1 g6 13.Rgd1 Ree2 14.Bg3 Rac2 (7.906.972.208) 11218
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