Author: Jeremiah Penery
Date: 13:36:55 08/26/01
Go up one level in this thread
On August 26, 2001 at 14:55:02, Roy Eassa wrote:
>On August 26, 2001 at 14:47:51, Roy Eassa wrote:
>
>>On August 26, 2001 at 14:45:40, Roy Eassa wrote:
>>
>>>On August 26, 2001 at 14:40:33, Roy Eassa wrote:
>>>
>>>>[D] 8/2r1k2p/p3p1p1/3r1p2/8/1P3PP1/P2RK2P/3R4 b - -
>>>>
>>>>I reached this position as white recently, and after the game I used Gambit
>>>>Tiger 2.0 to help analyze. What occurred in the game was:
>>>>
>>>>1... Rcd7(?) 2. Rxd5 Rxd5?? 3. Rxd5 exd5
>>>>
>>>>after which I believe white should win (which I did). I believe it's very bad
>>>>for black to trade off both pairs of rooks, and best to avoid allowing white to
>>>>exchange even one pair of rooks here because of isolating black's pawn.
>Shredder 5 seems best at understanding this, again after black's move 2. It
>chooses the right move in 11 seconds and, unlike the other engines, sees in 19
>seconds that this gives a big advantage:
>
>position: 0 1
> 1.00 0:00 -0.41-- Rxd5 exd5 (2) 0.1
> 1.00 0:00 -0.61 Rxd5 exd5 (4) 0.2
> 1.00 0:00 -0.26++ f4 Rxd1 Kxd1 (7) 0.3
> 1.00 0:00 -0.06 f4 Rxd1 Kxd1 (10) 0.5
> 1.00 0:00 +0.13++ Rc1 (23) 1.1
> 1.00 0:00 +0.13 Rc1 (24) 1.2
> 2.00 0:00 +0.06 Rc1 e5 (70) 3.5
> 2.00 0:00 +0.09++ Rd3 Kd7 (136) 6.8
> 2.00 0:00 +0.11 Rd3 Kd6 (171) 8.5
> 3.00 0:00 +0.08 Rd3 Kd6 f4 (503) 25.1
> 3.00 0:00 +0.10++ Rc1 Kd7 f4 (677) 33.8
> 3.00 0:00 +0.12 Rc1 Kd6 f4 (870) 43.5
> 4.00 0:00 +0.03 Rc1 Kd6 Ke3 e5 (1.773) 77.0
> 5.00 0:00 +0.04 Rc1 Kd6 a4 a5 f4 (4.901) 113.9
> 6.00 0:00 +0.04 Rc1 e5 Rc7+ Rd7 Rxd7+ Kxd7 b4 Kd6 a4 (13.839) 203.5
> 7.01 0:00 +0.02 Rc1 Kd6 Rc8 Rc5 Rd8+ Ke7 Rd2 e5 (37.610) 293.8
> 7.03 0:00 +0.03++ Rd3 Kd6 b4 h5 Ra3 Re5+ (62.602) 324.3
> 7.03 0:00 +0.07 Rd3 g5 b4 Rxd3 Kxd3 g4 f4 Kd6 (80.322) 344.7
> 8.01 0:00 +0.07 Rd3 g5 b4 Rxd3 Kxd3 e5 h3 f4 gxf4 exf4 (135.625) 368.5
> 8.06 0:00 +0.08++ b4 Rxd1 Kxd1 g5 a4 Kd7 Kd2 e5 Ke3 g4 (199.705) 389.2
> 8.06 0:00 +0.11 b4 Re5+ Kd2 Rd5+ Kc2 h6 a4 Kf6 f4 Rxd1 Kxd1 (232.008) 391.2
> 9.01 0:00 -0.03 b4 Rxd1 Kxd1 Kd6 Kd2 Kd5 h3 e5 a4 e4 (364.458) 408.1
> 9.03 0:01 -0.02++ Rc1 Kd6 a4 Rc5 Rd1+ Kc6 f4 e5 b4 Rd5 fxe5 Rxe5+ Kf2 Re1
>(436.701) 406.9
> 9.03 0:01 0.00 Rc1 Kd6 a4 Rc5 Rd1+ Rd5 Rc1 Rc5 (480.930) 404.8
> 10.01 0:01 0.00 Rc1 Kd6 a4 Rc5 Rd1+ Rd5 Rc1 Rc5 (742.176) 409.3
> 11.01 0:04 0.00 Rc1 Re5+ Kd2 Rd5+ Ke3 Re5+ Kd4 Rd5+ Ke3 Re5+ (1.681.189)
>410.2
> 12.01 0:07 0.00 Rc1 Re5+ Kd2 Rd5+ Ke3 Re5+ Kd4 Rd5+ Ke3 Re5+ (3.000.681)
>410.0
> 12.06 0:11 +0.01++ Rxd5 exd5 f4 Kd6 b4 g5 fxg5 h6 gxh6 d4 a3 (4.813.375)
>414.8
> 12.06 0:12 +0.16 Rxd5 exd5 b4 Kd6 Ke3 g5 h3 Kc6 a4 h6 f4 Kd6 (5.504.279)
>423.6
> 13.01 0:14 +0.41++ Rxd5 exd5 b4 Kd6 Ke3 g5 a4 a5 bxa5 Kd7 f4 g4 h4 gxh3
>(6.324.681) 431.4
> 13.01 0:15 +0.50 Rxd5 exd5 b4 Kd6 a4 g5 Ke3 Kc6 Kd4 g4 fxg4 fxg4 b5+ axb5
>axb5+ (6.847.727) 438.4
> 14.01 0:17 +0.75++ Rxd5 exd5 b4 Kd6 a4 g5 Ke3 Kc6 Kd4 Kb7 Kxd5 g4 fxg4 fxg4
>b5 (7.965.133) 445.7
> 14.01 0:19 +1.25++ Rxd5 exd5 b4 Kd6 Kd3 g5 a4 Kc6 Kd4 h5 Ke5 Kb6 Kxf5 a5
>(8.931.992) 452.9
> 14.01 0:20 +1.25 Rxd5 exd5 b4 Kd6 Kd3 Kc6 h3 Kd6 g4 fxg4 fxg4 h5 a3 hxg4 b5
>gxh3 (9.283.532) 454.8
>best move: Rd1xd5 time: 0:23.491 min n/s: 461.294 nodes: 10.832.584
Crafty understands this quite well, it seems:
8 0.43 0.97 3. Rxd5 exd5 4. Ke3 Kd6 5. Kd4 a5 6.
h3 h6 7. f4 Ke6
8-> 1.15 0.97 3. Rxd5 exd5 4. Ke3 Kd6 5. Kd4 a5 6.
h3 h6 7. f4 Ke6
9 2.39 0.95 3. Rxd5 exd5 4. b4 Kd6 5. a4 g5 6.
Kd3 Kc6 7. Kd4 h5
9-> 2.62 0.95 3. Rxd5 exd5 4. b4 Kd6 5. a4 g5 6.
Kd3 Kc6 7. Kd4 h5
10 5.21 1.04 3. Rxd5 exd5 4. b4 Kd6 5. a4 g5 6.
Kd3 Kc6 7. Kd4 h5 8. h4
10-> 6.70 1.04 3. Rxd5 exd5 4. b4 Kd6 5. a4 g5 6.
Kd3 Kc6 7. Kd4 h5 8. h4
11 10.51 1.03 3. Rxd5 exd5 4. Ke3 Kd6 5. Kd4 h6 6.
a3 g5 7. h3 h5 8. f4 g4 9. hxg4 hxg4
11-> 20.77 1.03 3. Rxd5 exd5 4. Ke3 Kd6 5. Kd4 h6 6.
a3 g5 7. h3 h5 8. f4 g4 9. hxg4 hxg4
12 30.49 1.06 3. Rxd5 exd5 4. Ke3 Kd6 5. Kd4 h6 6.
h3 Kc6 7. f4 Kd6 8. b4 Kc6 9. a4 Kd6
12-> 46.69 1.06 3. Rxd5 exd5 4. Ke3 Kd6 5. Kd4 h6 6.
h3 Kc6 7. f4 Kd6 8. b4 Kc6 9. a4 Kd6
13 1:06 ++ 3. Rxd5!!
13 1:30 1.79 3. Rxd5 exd5 4. Ke3 Kd6 5. b4 h6 6.
a4 g5 7. Kd4 g4 8. fxg4 fxg4 9. b5
a5 10. Ke3 Ke5
Of course, it doesn't want to play 1. ...Rcd7 in the first place, nor 2.
...Rxd5.
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