Author: Dann Corbit
Date: 07:48:05 01/02/02
Go up one level in this thread
On January 01, 2002 at 19:31:02, Peter Kappler wrote:
>On January 01, 2002 at 18:48:38, Dann Corbit wrote:
>
>>But the amazing move is this one:
>>[D]1R6/k3rp1p/1p6/pP4p1/1P6/4qPB1/6PK/3R4 w - - bm Rdd8; am bxa5; c0 "WOW!";
>>
>>Absolutely incredible that Sjeng found Rdd8, since the vastly inferior bxa5
>>looks so good to programs. Now, bxa5 is a good enough move to probably win
>>eventually. But Rdd8 is a positive death blow!
>>
>>Which programs (after a good, long, think) choose Rdd8 over bxa5?
>>
>
>Grok plays Rdd8 instantly and sticks with it (I only ran for 5 minutes).
>
>But bxa5 certainly doesn't seem "vastly inferior", although maybe I didn't
>crunch Rdd8 long enough. Can you post your analysis?
Amy after Rdd8:
17 14:28 -7.152 1. .. Re5 2. Rbc8 Kb7 3. Rc6 Qf4 4. Bxf4 gxf4 5. Rd7+ Kb8 6.
Rxb6+ Kc8 7. Rxf7 Rh5+ 8. Kg1 axb4 9. Rxf4 Kc7
17 -715 86828242069766 1. .. Re5 2. Rbc8 Kb7 3. Rc6 Qf4 4. Bxf4 gxf4
5. Rd7+ Kb8 6. Rxb6+ Kc8 7. Rxf7 Rh5+ 8. Kg1 axb4 9. Rxf4 Kc7
Here is ChessMaster 8000's view of what happens after Rdd8:
Time Depth Score Positions Moves
7:05 7/11 7.20 78806287 1...Re5 2. Rbc8 Kb7 3. Rc6 Qf4
4. Bxf4 gxf4 5. Rd7+ Kb8 6. Rxb6+
Kc8 7. Rd4 a4 8. Rxf4 Re7 9. Rc6+
Kb7 10. Ra6
Chess Tiger 14:
1R1R4/k3rp1p/1p6/pP4p1/1P6/4qPB1/6PK/8 b - - ce -684; acd 14; acs 300; pv Re5
Rbc8 Kb7 Rc6 Qf4 Rd7+ Kb8 Rxb6+ Kc8 Rbb7 Rxb5 Rxb5 Kxd7 Bxf4 gxf4 bxa5
Kc6;|Re7e5
Little Goliath sees only peril:
1R1R4/k3rp1p/1p6/pP4p1/1P6/4qPB1/6PK/8 b - - ce -795; acd 13; acs 300; pv Re5
Rbc8 Kb7 Rc6 Qe1 Rd7+ Kb8 Rdc7 Qxg3+ Kxg3 Re8;|Re7e5
Phalanx considers both the 3... Qf4 and 3... Qe1 ideas after Re5 and sees
destruction for both:
12 -729 15677 31752400 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 Qe3-e1 Rd8-d7
Kb7-b8 Rd7-c7 Qe1xg3 Kh2xg3 Re5-e8 Rc7xf7
Pa5xb4 Rc6xb6 Kb8-c8 Rf7xh7
12 -> 2:40.48 32518346 0 turns
13 -781 28553 57520877 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 Qe3-f4 Rd8-d7
Kb7-b8 Rc6xb6 Kb8-c8 Bg3xf4 Pg5xf4 Rd7xf7
Pa5xb4 Rf7xf4 Re5-h5 Kh2-g3 Pb4-b3 Rf4-b4
Kc8-c7
Pepito is very interesting because he considers several different alternatives
(none of which turn out to be appetizing):
10 -523 3712 15877594 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 f5 Rd8-d7 Kb7-b8 Rd7-c7
Re5-c5 Rc6xb6 Kb8-a8 b4xc5 f4 Rc7-c8 Ka8-a7 Rb6-a6 Ka7-b7
10 -502 7948 33710539 Qe3-e5 Bg3xe5 Re7xe5 b4xa5 b6xa5 b6 Ka7-a6 Rd8-d7
Re5-e2 Rd7xf7 h5 Rf7-a7 Ka6-b5 Kh2-g3
10 -502 7965 33796355 Qe3-e5 Bg3xe5 Re7xe5 b4xa5 b6xa5 b6 Ka7-a6 Rd8-d7
Re5-e2 Rd7xf7 h5 Rf7-a7 Ka6-b5 Kh2-g3
11 -535 13815 58457161 Qe3-e5 ?? Bg3xe5 Re7xe5 b4xa5 b6xa5 b6 Ka7-a6 Rd8-d7
Re5-e2 Rd7xf7 h5 Rf7-a7 Ka6-b5 Kh2-g3
11 -534 13842 58604993 Re7-e5 !!
11 -434 14363 60992218 Re7-e5 !!
11 -582 14621 62124519 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 f5 Rd8-d7 Kb7-b8 Rd7-c7
Qe3xf3 g2xf3 Re5-e2 Kh2-g1 f4 Kg1-f1 Re2-d2
11 -582 15207 65113408 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 f5 Rd8-d7 Kb7-b8 Rd7-c7
Qe3xf3 g2xf3 Re5-e2 Kh2-g1 f4 Kg1-f1 Re2-d2
12 -577 18853 82173933 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 Qe3-f4 Bg3xf4 g5xf4 Rd8-d7
Kb7-b8 Rc6xb6 Kb8-c8 Rb6-b7 a5xb4 Rd7xf7 Re5-h5 Kh2-g1 b3
12 -576 23745 104753843 Qe3-f4 Bg3xf4 g5xf4 Rb8-a8 Ka7-b7 Rd8-b8 Kb7-c7 b4xa5
b6xa5 Ra8-a7 Kc7xb8 Ra7xe7 f6 b6 h5 Re7-a7 h4 Ra7xa5
12 -576 23816 105100200 Qe3-f4 Bg3xf4 g5xf4 Rb8-a8 Ka7-b7 Rd8-b8 Kb7-c7 b4xa5
b6xa5 Ra8-a7 Kc7xb8 Ra7xe7 f6 b6 h5 Re7-a7 h4 Ra7xa5
13 -605 30592 136517114 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 Qe3-f4 Bg3xf4 g5xf4 Rd8-d7
Kb7-b8 Rc6xb6 Kb8-c8 Rb6-b7 Re5-h5 Kh2-g1 Rh5xb5 Rb7-c7 Kc8-b8 b4xa5 Rb5xa5
Rd7xf7
13 -605 33948 153324725 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 Qe3-f4 Bg3xf4 g5xf4 Rd8-d7
Kb7-b8 Rc6xb6 Kb8-c8 Rb6-b7 Re5-h5 Kh2-g1 Rh5xb5 Rb7-c7 Kc8-b8 b4xa5 Rb5xa5
Rd7xf7
14 -610 56418 261077413 Re7-e5 Rb8-c8 Ka7-b7 Rc8-c6 Qe3-f4 Bg3xf4 g5xf4 Rd8-d7
Kb7-b8 Rd7-c7 Re5-e8 Rc7xf7 a5xb4 Rc6xb6 Kb8-c8 Rb6-c6 Kc8-d8 Rc6-d6 Kd8-c8
Rf7xf4
Yace sees gloom and doom:
391670176 13:28.1 -6.82 14t 1...Re5 2.Rbc8 Kb7 3.Rc6 Qf4 4.Bxf4 gxf4 5.Rd7+
Kb8 6.Rxb6+ Kc8 7.Rbb7 Rxb5 8.Rxb5 Kxd7 9.bxa5
{HT} {-500}
Pharaon sees this:
13-> -726 233 59177703 Re5 Rbc8 Kb7 Rc6 Qf4 Bxf4 gxf4 Rd7 Kb8 bxa5 bxa5 Rb6
Kc8 Rxf7
Crafty's prognostication is for bad weather ahead:
1R1R4/k3rp1p/1p6/pP4p1/1P6/4qPB1/6PK/8 b - - acd 16; acn 630064392; acs 1000; ce
-799; pv Re5 Rbc8 Kb7 Rc6 Qd3 Rxd3 Rxb5 Rc7+ Ka6 bxa5 Rxa5 Bf2 f5 Rd6 Rb5 Rcc6
Rb2 Rxb6+ Rxb6 Bxb6;
Fritz responded with Qf4 which (as is plainly seen) loses immediately.
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