Computer Chess Club Archives


Search

Terms

Messages

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

Author: John Merlino

Date: 15:42:57 07/23/01

Go up one level in this thread


On July 23, 2001 at 18:22:49, Dann Corbit wrote:

>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.

CM8000 also prefers "the pedestrian". But it DOES feel pretty good about it
(comparatively):

Time	Depth	Score	Positions	Moves
0:00	2/5	1.09	12131		15. Be3 Qd6 16. Rad1 Nd7 17. Qc3 f5
0:00	2/5	1.16	21778		15. Bh4 Qb6 16. b3 Nh5 17. Rad1 Qc7
0:01	2/6	1.15	62789		15. Be3 Qd6 16. Rad1 a5 17. Ng5
					Red8 18. Nxe6 Qxe6
0:02	3/7	1.08	122767		15. Be3 Qd6 16. Rad1 Red8 17. Ng5
					Nxg5 18. Bxg5 e6
0:06	3/8	1.13	341852		15. Be3 Qd6 16. Rad1 Red8 17. Qa5
					b6 18. Qc3 Rac8
0:11	3/8	1.19	612722		15. Bh4 b5 16. b3 Nh5 17. Rad1
					bxc4 18. bxc4 Qd6 19. g3 Rab8
0:27	4/9	1.17	1540127		15. Bh4 Qd7 16. Rad1 Rad8 17. Qe3
					b5 18. b3 Nh5 19. d5 cxd5 20. Rxd5
1:01	4/10	1.08	3610156		15. Bh4 b5 16. b3 Nh5 17. Rad1
					bxc4 18. bxc4 Rb8 19. d5 cxd5 20.
					cxd5

jm



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.