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Subject: Re: Unclear sacrifice?

Author: Vincent Lejeune

Date: 20:14:54 08/08/02

Go up one level in this thread


On August 08, 2002 at 19:10:36, Gian-Carlo Pascutto wrote:

>On August 08, 2002 at 18:29:53, José Carlos wrote:
>
>>
>>  Today on ICC:
>>
>>[D]r3r1k1/3q1ppp/p2p1b2/1ppPn3/4B3/3P2PP/PPPB4/R2Q1RK1 w - - 0 18
>>
>>  In this position, my program played Rxf6. After a strange game, I believe with
>>some blunders by white, it ended in a draw.
>>  What does your program think? Is Rxf6 winning?
>
>Deep Sjeng wouldn't play it:
>
>Sjeng: go
>Middlegame phase.
>Time for move : 100000000
> 2      -3     8      284  Bf5 Qc7 (0)
> 3       9     8     1748  Bf5 Qc7 Re1 (0)
> 3       9     9     3907  Bf5 Qc7 Re1 (0)
> 4      -4     9     8868  Bf5 Qd8 Re1 Bg5 (0)
> 4      -4    13    13087  Bf5 Qd8 Re1 Bg5 (0)
> 5      -5    14    22774  Bf5 Qd8 Re1 Bg5 Bc3 (0)
> 5      -1    18    50466  Qh5 Ng6 c3 Qd8 Rae1 (0)
> 5      -1    20    67373  Qh5 Ng6 c3 Qd8 Rae1 (0)
> 6     -15    26   106378  Qh5 g6 Qe2 Bg7 Bg2 f5 (0)
> 6      -8    43   217509  Bf5 Qd8 Re1 Bg5 Bc3 f6 (0)
> 6      -8    51   264031  Bf5 Qd8 Re1 Bg5 Bc3 f6 (0)
> 7      -4    68   389033  Bf5 Qd8 Re1 g6 Be4 Bg5 Bc3 (0)
> 7      -4    87   526563  Bf5 Qd8 Re1 g6 Be4 Bg5 Bc3 (0)
> 8     -19   132   809466  Bf5 Qd8 h4 g6 Bh3 Nd7 c3 Bg7 (0)
> 8     -18   217  1297545  Bg2 Ng6 c3 Be5 Rf3 Ne7 Re3 Qf5 (0)
> 8     -14   288  1714302  Qh5 g6 Qd1 Bg7 Bg2 f5 Re1 Qd8 (0)
> 8     -14   294  1749982  Qh5 g6 Qd1 Bg7 Bg2 f5 Re1 Qd8 (0)
> 9     -14   443  2834500  Qh5 g6 Qe2 Bg7 g4 Qd8 g5 f5 gxf6 Bxf6 (0)
> 9      -7   764  4996834  Bf5 Qd8 h4 g6 Bh3 Nd7 c3 Bg7 Bg2 (0)
> 9      -7   902  5902616  Bf5 Qd8 h4 g6 Bh3 Nd7 c3 Bg7 Bg2 (0)
>10     -16  1094  7203474  Bf5 Qd8 h4 g6 Bh3 Nd7 c3 Be5 Bg5 f6 (0)
>10     -16  2352 14641702  Bf5 Qd8 h4 g6 Bh3 Nd7 c3 Be5 Bg5 f6 (0)
>11     -22  6839 38724512  Bf5 Qb7 c3 c4 Bf4 cxd3 Bxe5 Bxe5 Qxd3 g6 Be4 f5 (0)
>11     -22 10713 61136094  Bf5 Qb7 c3 c4 Bf4 cxd3 Bxe5 Bxe5 Qxd3 g6 Be4 f5 (0)
>12     -30 15389 85074119  Bf5 Qb7 c3 c4 Bf4 g6 d4 gxf5 dxe5 Qa7+ Rf2 dxe5 Bh6
>(0)
>12     -28 18542 102994481  Bg2 Ng6 c3 Ne5 Qc2 c4 dxc4 Nxc4 Rae1 Rxe1 Rxe1 Qa7+
>Kh2 Qf2 Rd1 Nxd2 Qxd2 (0)
>12     -28 34132 189073316  Bg2 Ng6 c3 Ne5 Qc2 c4 dxc4 Nxc4 Rae1 Rxe1 Rxe1 Qa7+
>Kh2 Qf2 Rd1 Nxd2 Qxd2 (0)
>13     -28 37415 207878359  Bg2 Ng6 c3 Ne5 Qc2 c4 dxc4 Nxc4 Rf2 Ne3 Qd3 Nxg2
>Kxg2 Rac8 Raf1 (0)
>13     -28 64065 353246101  Bg2 Ng6 c3 Ne5 Qc2 c4 dxc4 Nxc4 Rf2 Ne3 Qd3 Nxg2
>Kxg2 Rac8 Raf1 (0)
>
>If I play it out, the score stabilizes at +1 after a while, so it thinks
>it's unsound, but this may depend upon material evaluation as well.
>
>Sjeng: go
>Middlegame phase.
>Time for move : 1410065408
> 2     222     0      250  gxf6 Bg2 (0)
> 3     216     0     1417  gxf6 Qh5 Ng6 (0)
> 3     216     0     3179  gxf6 Qh5 Ng6 (0)
> 4     190     1     4993  gxf6 Qh5 Ng6 Re1 (0)
> 4     190     1     5803  gxf6 Qh5 Ng6 Re1 (0)
> 5     202     2     9381  gxf6 Qh5 Ng6 Re1 Qd8 (0)
> 5     202     2    14081  gxf6 Qh5 Ng6 Re1 Qd8 (0)
> 6     193     4    31854  gxf6 Qh5 Ng6 Re1 Qd8 Bh6 (0)
> 6     193     8    61588  gxf6 Qh5 Ng6 Re1 Qd8 Bh6 (0)
> 7     154    16   115540  gxf6 Qh5 Ng6 Bc3 f5 Bxf5 Qd8 (0)
> 7     154    27   180258  gxf6 Qh5 Ng6 Bc3 f5 Bxf5 Qd8 (0)
> 8     179    42   278012  gxf6 Qh5 Ng6 Bc3 c4 Bxf6 Qa7+ Kh1 Qf2 (0)
> 8     179    54   361808  gxf6 Qh5 Ng6 Bc3 c4 Bxf6 Qa7+ Kh1 Qf2 (0)
> 9     177    73   478908  gxf6 Qh5 Ng6 Bc3 c4 Bxf6 Qa7+ Kg2 Qe3 Rf1 (0)
> 9     177   109   763766  gxf6 Qh5 Ng6 Bc3 c4 Bxf6 Qa7+ Kg2 Qe3 Rf1 (0)
>10     177   159  1077243  gxf6 Qh5 Ng6 Bc3 c4 Kg2 Qa7 Rf1 Qe3 Bxf6 <a5> (0)
>10     177   295  2187999  gxf6 Qh5 Ng6 Bc3 c4 Kg2 Qa7 Rf1 Qe3 Bxf6 <a5> (0)
>11     164   460  3288373  gxf6 Qh5 Ng6 Bc3 c4 Rf1 Qa7+ Kg2 Qe3 Qf3 Qxf3+ Rxf3
>cxd3 Bxd3 (0)
>11     164   788  5701678  gxf6 Qh5 Ng6 Bc3 c4 Rf1 Qa7+ Kg2 Qe3 Qf3 Qxf3+ Rxf3
>cxd3 Bxd3 (0)
>12     153  1253  8481449  gxf6 Qh5 Ng6 Bc3 c4 Bxf6 Qa7+ Kg2 Qe3 Qf3 Qh6 dxc4
>Qd2+ Kh1 bxc4 (0)
>12     153  2254 15263491  gxf6 Qh5 Ng6 Bc3 c4 Bxf6 Qa7+ Kg2 Qe3 Qf3 Qh6 dxc4
>Qd2+ Kh1 bxc4 (0)
>13     127  3392 21889441  gxf6 Qh5 Ng6 Bc3 f5 Bxf5 Qe7 Qh6 Qf8 Qxf8+ Kxf8 Kf2
>b4 Bf6 h5 (0)
>13     127  6901 44751317  gxf6 Qh5 Ng6 Bc3 f5 Bxf5 Qe7 Qh6 Qf8 Qxf8+ Kxf8 Kf2
>b4 Bf6 h5 (0)
>14     117  9295 58571036  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Rxf5 a5 Bf6 Qd7 Rg5 c4 c3
>(0)
>14     117 16216 104674129  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Rxf5 a5 Bf6 Qd7 Rg5 c4
>c3 (0)
>15     115 22583 141746514  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Qxf5 Rac8 Bf6 Qc7 d4 c4
>c3 a5 (0)
>15     115 43619 273189577  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Qxf5 Rac8 Bf6 Qc7 d4 c4
>c3 a5 (0)
>16     115 58577 353947767  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Qxf5 Ra7 Bf6 Qd7 Qh5 a5
>Bf5 Qc7 c3 (0)
>16     115 116561 697897294  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Qxf5 Ra7 Bf6 Qd7 Qh5 a5
>Bf5 Qc7 c3 (0)
>17     113 149568 879989976  gxf6 Qh5 Ng6 Bc3 Qe7 Rf1 f5 Qxf5 Ra7 Bf6 Qd7 Qxd7
>Rxd7 Kf2 Ne5 Bf5 Rc7 Re1 (0)
>
>--
>GCP

after : gxf6 Qh5 Ng6 Bc3 , Re5! is a stronger move



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