Author: Uri Blass
Date: 01:29:59 12/18/01
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On December 18, 2001 at 03:00:55, Steve Maughan wrote: >I received Shredder 6 yesterday. Having spent a couple of hours playing around >with it, my impressions are positive! I don't have Shredder 5.32 but do have >the original Shredder 5. The upgrade seems to be much more tactically nimble >than S5, aggressive and, like all top engines, accutely aware of king safety. > >As a test overnight I pitted it against Goliath 1.5 - with a twist. I used the >'Nunn Match' feature to force Shredder 6 to play my favourite opening gambits. >This isn't meant to be an indicator of playing strength, more an experiment to >see if Shredder 6 can cope when the heat is on. Goliath 1.5 makes a good >opponent for these matches as it has great tactical skills even though it's >positional understanding is not quite up to that of the top engines. I do not believe that goliath has great tactical skills. I looked only at the first game and I think that shredder6 simply outsearched goliath. At move 15 shredder saw a jump in the score from 0.06 to 1.52 and I do not believe that it was only for positional reasons After this move goliath had a score of 1.38 pawns for itself that suggest that it did not see the tactics Even if you look at the position from only material point of view programs can see that black is not close to 1 pawn advantage after search. I believe that the previous move(Rb8) was a tactical mistake and I will check it later. Here is some analysis of yace(only material evaluation) for move 15: Yace was slowed down by a significant factor in the first 40 seconds. Qc7 failed low at depth 14 and I wait for yace to solve the fail low material values: pawn=0.8,knight=3.4,bishop=3.5,rook=5,queen=10.01(I like more 1 1 3 5 9 but the values are from the version that I got from the programmer) Shredder 6 - Goliath Light 1.5 [D]1rbq1k1r/pp2n1pp/3p2n1/1R3p2/2BP4/B1P2Q2/P1P2PPP/4R1K1 b - - 0 1 Analysis by Yace 0.99.56: 15...Rg8 16.Bxg8 Nxg8 µ (-1.00) Depth: 1 00:00:07 15...Qe8 16.Bxd6 -+ (-1.70) Depth: 1 00:00:07 15...Qd7 -+ (-2.50) Depth: 1 00:00:07 15...Qd7 16.Qe3 -+ (-2.50) Depth: 2 00:00:07 15...Qd7 16.Qe3 Nc6 -+ (-2.50) Depth: 3 00:00:09 15...Qd7 16.Qe3 Nc6 17.Rb3 -+ (-2.50) Depth: 4 00:00:13 15...Qd7 16.Re6 Qc7 17.Rxf5+ Kg8 18.Rxg6+ Be6 -+ (-2.10) Depth: 5 00:00:23 25kN 15...Qd7 16.Re6 d5 17.Rd6 Qc7 18.Bxd5 -+ (-1.80) Depth: 5 00:00:27 31kN 15...Qc7 16.Re6 Bxe6 17.Bxe6 -+ (-1.81) Depth: 5 00:00:33 47kN 15...Qc7 16.Bb3 f4 17.Rb4 Ke8 -+ (-2.50) Depth: 5 00:00:33 47kN 15...Qc7 16.Bb3 f4 17.Rb4 Ke8 18.Qd3 -+ (-2.50) Depth: 6 00:00:39 110kN 15...Qc7 16.Bb3 f4 17.Rb4 Ke8 18.Qd3 b6 -+ (-2.50) Depth: 7 00:00:41 179kN 15...Qc7 16.Bb3 f4 17.Rd5 Nxd5 18.Qxd5 b6 19.Bxd6+ Qxd6 20.Qxd6+ Ne7 -+ (-2.10) Depth: 8 00:00:41 493kN 15...Qc7 16.Bb3 -+ (-2.10) Depth: 8 00:00:42 493kN 15...Qc7 16.Bb3 f4 17.Rd5 Nxd5 18.Qxd5 Qc4 19.Bxc4 Ne7 -+ (-1.70) Depth: 9 00:00:47 3774kN 15...Qc7 16.Bb3 -+ (-1.70) Depth: 9 00:00:49 4473kN 15...Qc7 16.Bb3 Bd7 17.Rd5 Re8 18.Bxd6 Qc8 19.Qe3 Qa8 20.Rc5 -+ (-1.70) Depth: 10 00:01:02 11678kN 15...Qc7 16.Bb3 Bd7 17.Rd5 Re8 18.Bxd6 Qc8 19.Rc5 Qxc5 20.dxc5 Nh4 µ (-1.30) Depth: 11 00:01:16 18881kN 15...Qc7 16.Bb3 h5 17.Rd5 Nh4 18.Qf4 Qxc3 19.Rxe7 Qa1+ 20.Bc1 Ng6 21.Rf7+ Kxf7 22.Rxd6+ Kf8 23.Rxg6 ³ (-0.70) Depth: 11 00:01:40 32135kN 15...Qd7 16.Re6 Qxb5 17.Rxd6 Qxc4 18.Rd8+ Kf7 19.Rf8+ Nxf8 20.Qh5+ g6 21.Bxe7 µ (-0.71) Depth: 11 00:02:14 51077kN 15...Qd7 16.Re6 Qxb5 17.Bxb5 Bxe6 18.Bxd6 Rd8 19.Bxe7+ Nxe7 20.Qxb7 Bd5 21.Qxa7 Ra8 µ (-0.99) Depth: 11 00:02:35 62567kN 15...Qd7 16.g4 Qc7 17.gxf5 Nh4 18.Qh5 Nf3+ 19.Qxf3 Qxc4 20.f6 gxf6 21.Qxf6+ Ke8 22.Qxh8+ Kf7 23.Rxe7+ Kxe7 ³ (-0.59) Depth: 12 00:05:44 165663kN 15...Qd7 16.g4 Qc7 17.gxf5 Nh4 18.Qh5 Qxc4 19.Bxd6 Qxb5 20.Rxe7 Nf3+ 21.Qxf3 Qa6 22.Re6+ Kf7 23.Bxb8 = (0.10) Depth: 12 00:06:14 182041kN 15...Qd7 16.g4 Qc7 17.gxf5 Nh4 18.Qh5 Qxc4 19.Bxd6 Qxb5 20.Rxe7 Nf3+ 21.Qxf3 Be6 22.fxe6+ Qf5 23.Qxf5+ Kg8 ² (0.50) Depth: 13 00:12:02 363964kN 15...Qd7 16.g4 a6 17.Rxf5+ Ke8 18.Rf7 Kd8 19.Re6 Qxe6 20.Bxe6 Bxe6 21.Rxg7 Kc7 22.Qg3 Rbd8 ² (0.61) Depth: 13 00:16:53 520414kN 15...Qc7 16.Bb3 Ke8 17.Rd5 b5 18.Rxd6 b4 19.cxb4 ² (0.60) Depth: 13 00:19:25 602085kN 15...Qc7 16.Bb3 Ke8 17.Rd5 b5 18.Bxd6 Qb6 19.Bxb8 Qxb8 20.Qg3 Qxg3 21.hxg3 Bd7 22.Rd6 = (-0.20) Depth: 13 00:22:44 706575kN 15...Qc7 16.Bb3 Ke8 17.Rd5 b5 18.Bxd6 Qb6 19.Bc5 Qa5 20.Bxe7 Be6 21.Rxe6 Nxe7 = (0.20) Depth: 14 00:30:38 955497kN (Blass, Tel-aviv 18.12.2001) Uri
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