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Subject: Re: Does Your Program See the Brilliant Exchange Sac?

Author: Dann Corbit

Date: 15:22:49 07/23/01

Go up one level in this thread


On July 23, 2001 at 12:21:38, odell hall wrote:

>[D] r2qr1k1/pp2ppbp/2p1nnp1/6B1/2PP4/5N1P/PPBQ1PP1/R3R1K1 w - - 0 15
>
>  Gambit2  Finds this immediately
>
>
>hall,o - Junior 7
>r2qr1k1/pp2ppbp/2p1nnp1/6B1/2PP4/5N1P/PPBQ1PP1/R3R1K1 w - - 0 1
>
>Analysis by Gambit Tiger 2.0:
>
>1.Bxf6 Bxf6 2.d5 Nc5 3.dxc6 Qxd2 4.Nxd2 bxc6
>  ²  (0.40)   Depth: 6   00:00:00  95kN
>1.Bxf6 Bxf6 2.d5 Nc5 3.Rad1 cxd5 4.b4 Na6 5.cxd5
>  ²  (0.42)   Depth: 7   00:00:00  112kN
>1.Bxf6 Bxf6 2.d5 Nc5 3.Rad1 cxd5 4.b4 Ne4 5.Qxd5 Qxd5 6.Rxd5
>  ²  (0.34)   Depth: 8   00:00:01  207kN
>1.Rxe6 fxe6 2.Re1 Qb6 3.b3 Rad8 4.Rxe6 Rd6 5.Qe3
>  ²  (0.48)   Depth: 8   00:00:01  260kN
>1.Rxe6 fxe6 2.Qe3 Qd6 3.Bf4 Qd7 4.Ne5 Qd8 5.Bh6 Bxh6 6.Qxh6 Qxd4
>  ²  (0.48)   Depth: 9   00:00:02  452kN
>1.Rxe6 fxe6 2.Qe3 Qd6 3.Bf4 Qd7 4.Ng5 Bh6 5.Nxe6 Bxf4 6.Nxf4
>  ²  (0.54)   Depth: 10   00:00:03  796kN
>1.Rxe6 fxe6 2.Qe3 Qd6 3.Bf4 Qd7 4.Ng5 Bh6 5.Nxe6 Bxf4 6.Nxf4 Red8 7.Ne6
>  ²  (0.48)   Depth: 11   00:00:07  1568kN
>hall,o - Junior 7
>r2qr1k1/pp2ppbp/2p1nnp1/6B1/2PP4/5N1P/PPBQ1PP1/R3R1K1 w - - 0 1
>
>Analysis by Gambit Tiger 2.0:
>
>1.Bxf6 Bxf6 2.d5 Nc5 3.dxc6 Qxd2 4.Nxd2 bxc6
>  ²  (0.40)   Depth: 6   00:00:00  95kN
>1.Bxf6 Bxf6 2.d5 Nc5 3.Rad1 cxd5 4.b4 Na6 5.cxd5
>  ²  (0.42)   Depth: 7   00:00:00  112kN
>1.Bxf6 Bxf6 2.d5 Nc5 3.Rad1 cxd5 4.b4 Ne4 5.Qxd5 Qxd5 6.Rxd5
>  ²  (0.34)   Depth: 8   00:00:01  207kN
>1.Rxe6 fxe6 2.Re1 Qb6 3.b3 Rad8 4.Rxe6 Rd6 5.Qe3
>  ²  (0.48)   Depth: 8   00:00:01  260kN
>1.Rxe6 fxe6 2.Qe3 Qd6 3.Bf4 Qd7 4.Ne5 Qd8 5.Bh6 Bxh6 6.Qxh6 Qxd4
>  ²  (0.48)   Depth: 9   00:00:02  452kN
>1.Rxe6 fxe6 2.Qe3 Qd6 3.Bf4 Qd7 4.Ng5 Bh6 5.Nxe6 Bxf4 6.Nxf4
>  ²  (0.54)   Depth: 10   00:00:03  796kN
>1.Rxe6 fxe6 2.Qe3 Qd6 3.Bf4 Qd7 4.Ng5 Bh6 5.Nxe6 Bxf4 6.Nxf4 Red8 7.Ne6
>  ²  (0.48)   Depth: 11   00:00:07  1568kN

That is quite a beautiful move.

Beowulf plays the cowardly (in comparison):
g5e3 g8f8 d2c1 d8d7 g1h2 a8d8 c4c5 h7h6 f3e5 d7d5

But I am relieve to see that Phalanx (which has a propensity for brilliant moves
from time to time) plays the same dull move (with a much better plan):
 11    106 28454 53104772  Bg5-e3  Qd8-c7  Ra1-d1  Pb7-b5  Pb2-b3  Ra8-b8
                           Rd1-b1  Pb5xc4  Pb3xc4  Pc6-c5  Pd4-d5  Ne6-f8

As does ExChess:
 13.   0.59   412 144845525   1. Be3 Nf8 2. Rad1 Qc8 3. Bf4 Ne6 4. Be5 Nd7 5.
Bh2 c5 6. dxc5 Rd8 7. Be5 Nexc5

And Amy:
13    5:40  +0.384  1. Be3 Qc7 2. Qb4 b6 3. Qa3 Rad8 4. Bd3 Nd7 5. Re2 c5 6.
                    d5
        13     38   3400771924835 1. Be3 Qc7 2. Qb4 b6 3. Qa3 Rad8 4. Bd3 Nd7 5.
Re2 c5 6. d5
13    7:22  +0.384  1. Be3 Qc7 2. Qb4 b6 3. Qa3 Rad8 4. Bd3 Nd7 5. Re2 c5 6.
                    d5
        13     38   4425895899769 1. Be3 Qc7 2. Qb4 b6 3. Qa3 Rad8 4. Bd3 Nd7 5.
Re2 c5 6. d5

And Bringer:
bm Rxe6;
============ Weiß / white  am Zug / to move ===
 sT   .   .  sD  sT   .  sK   .
 sB  sB   .   .  sB  sB  sL  sB
  .   .  sB   .  sS  sS  sB   .
  .   .   .   .   .   .  wL   .
  .   .  wB  wB   .   .   .   .
  .   .   .   .   .  wS   .  wB
 wB  wB  wL  wD   .  wB  wB   .
 wT   .   .   .  wT   .  wK   .
target response time (ms): -1
max. response time (ms): -1
Static score: mat = 5, pos = 54, total = 59
0:00:00.1  ( 6/12)      16093   0.52  g5-e3  d8-d6  f3-e5  f6-d7  e5xd7  d6xd7
0:00:00.3  ( 7/14)      58838   0.60  g5-e3  d8-d6  c4-c5  d6-d5  c2-b3  d5-e4
0:00:01.2  ( 8/14)     226263   0.45  g5-e3  d8-d6  d2-c3  a8-d8  c4-c5  d6-d5
0:00:03.2  ( 9/16)     619151   0.51  g5-e3  d8-d6  c4-c5  d6-c7
0:00:11.2  (10/17)    2018162   0.46  g5-e3  d8-c7
0:00:41.4  (11/24)    7827912   0.49  g5-e3  d8-c7  d2-d3  a8-d8
0:01:01.8  (12/24)   11640244   0.45  g5-e3  d8-c7  d2-d3  a8-d8  d3-a3  b7-b6
a1-d1  e8-f8  a3-b3  c6-c5  d4-d5  e6-f4

 1.  g5-e3


Crafty [on the other hand] goes for the pedestrian:
12->   3:16   0.58   1. Bh4 Nh5 2. Rad1 Qc7 3. Qe3 c5 4.
                     d5 Nd4 5. Ba4 Nf5 6. Qg5 Nxh4 7. Nxh4

As does Yace:
  37523348  1:56.2   0.45 10.  1.Bh4 Nh5 2.Rad1 Qc7
 102236489  5:26.9   0.50 11t  1.Bh4 a5 2.Rad1 Qb6 3.b3 Red8 4.Bg3 Nd7 5.Qe3H
                               Qb4H {HT} {10}


Gambit Tiger's move is definitely the most sexy of the lot.
However, all the programs seem to have a pretty low opinion of their selection.
Only Phalanx has an eval over one pawn in strength estimation.



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