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Subject: Re: a test position

Author: Tony Werten

Date: 03:35:40 12/19/01

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On December 19, 2001 at 02:42:20, Uri Blass wrote:

>The target is to avoid a tactical mistake
>Goliath light blundered by Rb8
>
>I do not have a list of the possible tactical mistake and
>you have to find a list of the possible tactical mistakes
>in order to know the solution:
>
>It seems that Qc7 and h5 are not tactical mistakes
>when Rb8 is a tactical mistake
>
>Here is yace's only material analysis(it found h5 in the previous analysis but
>it was only after learning that Rb8 is bad):
>
>pawn=0.8,knight=3.4,bishop=3.5,rook=5
>
>Shredder 6 - Goliath Light 1.5
>[D]r1bq1k1r/pp2n1pp/3p2n1/5p2/2BP4/B1P2Q2/P1P2PPP/1R2R1K1 b - - 0 1

XiniX never considers Rb8. It sticks with Qc7 with a score of +0.58

Tony

>
>Analysis by Yace 0.99.56:
>
>14...Rg8 15.Bxg8 Nxg8
>  µ  (-1.00)   Depth: 1   00:00:08
>14...Qe8 15.Bxd6
>  -+  (-1.70)   Depth: 1   00:00:08
>14...Qd7
>  -+  (-2.50)   Depth: 1   00:00:08
>14...Qd7 15.Qd3
>  -+  (-2.50)   Depth: 2   00:00:08
>14...Qd7 15.Qd3 Ng8
>  -+  (-2.50)   Depth: 3   00:00:10
>14...Qd7 15.Qd3 Ng8 16.Re3
>  -+  (-2.50)   Depth: 4   00:00:12
>14...Qd7 15.Qd3 Qc7 16.Be6 Bxe6
>  -+  (-2.50)   Depth: 5   00:00:20  16kN
>14...Qd7 15.Qd3 Qc7 16.Qf1 Nf4 17.Bb5
>  -+  (-2.50)   Depth: 6   00:00:31  46kN
>14...Qd7 15.Be6 Qc7 16.g3 Qxc3 17.Qxc3 Bxe6
>  -+  (-2.10)   Depth: 7   00:00:39  101kN
>14...Qd7 15.Be6 Qc7 16.g3 Ne5 17.dxe5 Bxe6 18.exd6
>  -+  (-1.80)   Depth: 7   00:00:40  119kN
>14...Qc7 15.Bxd6 Qxc4 16.Rxe7 Nxe7 17.Qxb7 Bxb7 18.Rxb7
>  -+  (-1.81)   Depth: 7   00:00:40  223kN
>14...Qc7 15.Be6 Rb8 16.Bxc8 Rxc8 17.Rxb7 Qxc3 18.Qxc3
>  -+  (-2.50)   Depth: 7   00:00:40  223kN
>14...Qc7 15.Be6 Rb8 16.Bxc8 Qxc8 17.Bxd6 Nh4 18.Bxe7+ Kf7
>  -+  (-2.10)   Depth: 8   00:00:40  422kN
>14...Qc7 15.Be6 Rb8 16.Bxc8 Nxc8 17.Qxf5+ Qf7 18.Qxf7+ Kxf7 19.g3 Nge7 20.Kh1
>  -+  (-1.70)   Depth: 8   00:00:41  422kN
>14...Rb8 15.Bxd6 Qxd6 16.Rxe7 Nxe7 17.Qh5 Be6 18.Qxh7 Rxh7 19.Bxe6
>  -+  (-1.71)   Depth: 8   00:00:41  758kN
>14...Rb8 15.Be6 a6 16.Bxc8 Nh4 17.Qd3 Nxc8 18.g3
>  -+  (-2.50)   Depth: 8   00:00:42  1193kN
>14...Rb8 15.Be6 b6 16.Bxc8 Rxc8 17.Qd3 Rc6 18.Qg3 f4 19.Qh3
>  -+  (-2.50)   Depth: 9   00:00:45  2384kN
>14...Rb8 15.Be6 b6 16.Bxc8 Rxc8 17.Re6 f4 18.Bxd6 Qxd6 19.Rxd6 Rxc3
>  -+  (-2.10)   Depth: 10   00:00:46  2973kN
>14...Rb8 15.Be6 b6 16.Bxc8 Rxc8 17.Re6 Nh4 18.Qd3 f4 19.Bxd6 Nhg6
>  -+  (-1.70)   Depth: 10   00:00:49  4740kN
>14...Rb8 15.Be6 b6 16.Bxc8 Rxc8 17.Re6 Nh4 18.Qd3 f4 19.Bxd6 Nhg6 20.Kh1
>  -+  (-1.70)   Depth: 11   00:01:10  16727kN
>14...Rb8 15.Be6 b6 16.Bxc8 Rxc8 17.Re6 Ke8 18.Bxd6 Kf7 19.Rbe1 Re8 20.Qd3 f4
>  -+  (-1.70)   Depth: 12   00:01:54  41891kN
>14...Rb8 15.Rb5 b6 16.Rd5 Qc7 17.Rxd6 Qxc4 18.Rxg6 hxg6 19.Rxe7 Kg8 20.Re8+ Kf7
>21.Rxh8 Bd7
>  µ  (-1.30)   Depth: 13   00:06:43  201052kN
>14...Rb8 15.Rb5 Qd7 16.Re6 Qxb5 17.Bxb5 Bxe6 18.Bxd6 Rd8 19.Qxb7
>  µ  (-0.99)   Depth: 13   00:09:32  292115kN
>14...Qc7 15.Be6
>  µ  (-1.00)   Depth: 13   00:10:38  328254kN
>14...Qc7 15.Be6 Rb8 16.Bxc8 Rxc8 17.Qxb7 Kf7 18.Qxc7 Rxc7 19.Bb4 Kf6 20.Bxd6
>Rxc3 21.Rb7 Nc8
>  -+  (-1.70)   Depth: 13   00:12:34  390920kN
>14...Qc7 15.Be6 Rb8 16.Bxc8 Rxc8 17.Qxb7 Kf7 18.Qxc7 Rxc7 19.Bb4 Kf6 20.Bxd6
>Rxc3 21.Rb7 Nc8 22.Rc7
>  -+  (-1.70)   Depth: 14   00:20:19  643235kN
>14...Qc7 15.Be6 Rb8 16.Bxc8 Rxc8 17.Qxb7 Kf7 18.Qxc7 Rxc7 19.Bb4 Kf6 20.Bxd6
>Rxc3 21.Rb7 Nc8 22.Rc7 Rxc7
>  -+  (-1.70)   Depth: 15   00:45:47  1467464kN
>14...Qc7 15.Be6 h6 16.Bxc8 Rxc8 17.Qxb7 Kf7 18.Qxc7 Rxc7 19.Bxd6 Rxc3 20.Rb7 Re8
>21.Bb4 Rxc2 22.Rxa7 Kf6 23.g3
>  -+  (-1.70)   Depth: 16   02:37:11  787944kN
>14...Qc7 15.Bd5 h5 16.Qg3 f4 17.Rxe7 Nxe7 18.Qxf4+ Nf5 19.Rxb7 Bxb7 20.Qxf5+ Ke8
>21.Qe4+ Kd8 22.Bxb7 Rb8 23.Qh4+ Qe7 24.Qxe7+ Kxe7 25.Ba6
>  µ  (-1.40)   Depth: 17   08:55:52  102918kN
>
>(Blass, Tel-aviv 19.12.2001)
>
>Uri



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