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Subject: Re: Brilliant positional sac by Kasparov. Can any find it?

Author: Uri Blass

Date: 14:43:28 08/07/04

Go up one level in this thread


On August 06, 2004 at 02:02:14, Frank E. Oldham wrote:

>On August 05, 2004 at 19:42:24, Albert Silver wrote:
>
>>The following position arose in Kasparov-Andersson, Tilburg, 1981. Kasparov,
>>only 18 at the time, played a brilliant pawn sac that left Andersson unable to
>>develop and to his loss in spectacular fashion. It is a difficult move to find,
>>and I am not even sure whether any engine will, yet it is unquestionably the
>>best move.
>>
>>                                         Albert
>>
>>[D]r2qkb1r/n1pp1pp1/4p1bp/1p6/1P1P3P/P3P1P1/1B1N1P2/R2QKB1R w KQkq -
>>14.d5 is the move here.
>
>crafty19.15, Mac dual G5, finds it pretty easily in ply 14
>by ply 17 the PV matches the game very well
>
>               11->   3.30   0.21   1. Bg2 d5 2. O-O Be7 3. e4 dxe4 4.
>                                    Nxe4 O-O 5. Nc5 Rc8 6. Qg4 Bc2 (s=4)
>               12     6.18   0.28   1. Bg2 c6 2. O-O Be7 3. e4 O-O 4. h5
>                                    Bh7 5. Rc1 Qc7 6. Qg4 d5 (s=3)
>               12->   7.94   0.28   1. Bg2 c6 2. O-O Be7 3. e4 O-O 4. h5
>                                    Bh7 5. Rc1 Qc7 6. Qg4 d5
>               13    13.46   0.16   1. Bg2 d5 2. e4 dxe4 3. Nxe4 Be7 4.
>                                    Nc5 Rb8 5. a4 O-O 6. a5 Bxc5 7. dxc5
>                                    Qxd1+ 8. Rxd1 Rbd8 9. Rxd8 Rxd8
>               13->  23.01   0.16   1. Bg2 d5 2. e4 dxe4 3. Nxe4 Be7 4.
>                                    Nc5 Rb8 5. a4 O-O 6. a5 Bxc5 7. dxc5
>                                    Qxd1+ 8. Rxd1 Rbd8 9. Rxd8 Rxd8 (s=2)
>               14    35.47   0.12   1. Bg2 d5 2. e4 c6 3. h5 Bh7 4. Qe2
>                                    Be7 5. O-O O-O 6. Rac1 Bd6 7. exd5
>                                    cxd5 8. Rfe1
>               14     1:33   0.31   1. d5 exd5 2. Bg2 c6 3. O-O f6 4. e4
>                                    dxe4 5. Bxe4 Bxe4 6. Nxe4 d5 7. Qh5+
>                                    Kd7 8. Rad1 Kc7 9. Qe2
>               14->   1:33   0.31   1. d5 exd5 2. Bg2 c6 3. O-O f6 4. e4
>                                    dxe4 5. Bxe4 Bxe4 6. Nxe4 d5 7. Qh5+
>                                    Kd7 8. Rad1 Kc7 9. Qe2 (s=2)
>               15     2:31   0.42   1. d5 exd5 2. Bg2 c6 3. O-O Qe7 4.
>                                    e4 dxe4 5. Nxe4 O-O-O 6. Nc5 d6 7.
>                                    Qg4+ Kb8 8. Rae1 h5 9. Rxe7 hxg4
>               15->   2:59   0.42   1. d5 exd5 2. Bg2 c6 3. O-O Qe7 4.
>                                    e4 dxe4 5. Nxe4 O-O-O 6. Nc5 d6 7.
>                                    Qg4+ Kb8 8. Rae1 h5 9. Rxe7 hxg4
>               16     5:06   0.49   1. d5 exd5 2. Bg2 c6 3. O-O Qe7 4.
>                                    e4 dxe4 5. Nxe4 O-O-O 6. Nd2 f6 7.
>                                    h5 Bf5 8. Re1 Be6 9. Rc1
>               16->   5:36   0.49   1. d5 exd5 2. Bg2 c6 3. O-O Qe7 4.
>                                    e4 dxe4 5. Nxe4 O-O-O 6. Nd2 f6 7.
>                                    h5 Bf5 8. Re1 Be6 9. Rc1
>               17    18:07   0.61   1. d5 exd5 2. Bg2 c6 3. O-O f6 4. Re1
>                                    Be7 5. Qg4 Kf7 6. h5 Bd3 7. e4 dxe4
>                                    8. Bxe4 Bxe4 9. Nxe4 d5 10. Rad1
>               17->  18:31   0.61   1. d5 exd5 2. Bg2 c6 3. O-O f6 4. Re1
>                                    Be7 5. Qg4 Kf7 6. h5 Bd3 7. e4 dxe4
>                                    8. Bxe4 Bxe4 9. Nxe4 d5 10. Rad1

I gave movei a long time but even after more than 2 hours of search it can only
see minimal advantage for white not from the root position but from the position
after 1.d5 exd5 2.Bg2 c6 3.0-0
It suggests Rg8
when the score was near 0 in all the last iterations

[D]r2qkb1r/n2p1pp1/2p3bp/1p1p4/1P5P/P3P1P1/1B1N1PB1/R2Q1RK1 b kq - 0 16

depth=18 -0.01 h8g8 f1e1 f8e7 h4h5 g6h7 e3e4 d5e4 d2e4 d7d5 e4c5 a7c8 a3a4 b5a4
a1a4 a8a4 d1a4 d8d6 b2d4

Uri



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