Author: Pete Galati
Date: 16:13:07 02/28/01
Go up one level in this thread
On February 28, 2001 at 17:14:27, Sune Larsson wrote:
>On February 28, 2001 at 16:31:40, Pete Galati wrote:
>
>>On February 28, 2001 at 14:33:56, Sune Larsson wrote:
>>
>>>
>>> 3r4/7p/Rp4k1/5p2/4p3/2P5/PP3P1P/5K2 b - - 0 1
>>>
>>> This is Tarrasch-Rubinstein, San Sebastian 1911.
>>> Black is a pawn down and the b6 pawn is under attack. Passive
>>> defence with 1.-Rd6 or 1.-Rb8 is doomed to failure. Rubinstein
>>> grasps his only chance: To mobilize his rook and king.
>>> Activity is vital in rook endings.
>>>
>>> 1.-Rd2! 2.Rxb6+ Kg5 3.Ke1 [3.a4 f4 4.a5 f3! is more than welcome to black.]
>>> 3.-Rc2 4.Rb5 Kg4! 5.h3+ Kxh3 6.Rxf5 Rxb2 and black drew without effort.
>>>
>>>
>>> Test: Big + for your program if it chooses 1.-Rd2! combined with
>>> activating the king.
>>>
>>> Thumbs down if it chooses passive defence with 1.-Rd6 or 1.-Rb8.
>>>
>>> Sune
>>
>>Can't say I understand Rook endings, but I would have personally protected that
>>pawn. On the other hand, I consider getting the Rook to it's 7th rank pretty
>>important.
>>
>>Comet being a somewhat defensive type program protected the pawn with Rb8, I
>>don't understand protecting it from there. It looked at Rd6 for less than a
>>second.
>>
>>Missing virtual instinct that Comet never comcidered Rd2 in 63 minutes?
>>
>>Pete
>
> Hi Pete, I think this ending is difficult for most (all] programs, Deep
> Fritz/Shredder, Junior, Tiger included. If a program could play this
> ending like Rubinstein, I'm sure we would have seen the post here...
> These endgames are strange - afterwards it looks so easy...
>
> Sune
Amy had about the same reaction as Comet did, and worked on it longer too.
Pete
Amy version Winboard Version 0.7, Copyright (C) 2000 Thorsten Greiner
[........]
GamePhase: Middlegame
It Time Score principal Variation
1 0.0 --- 1. .. f4
1 0.0 -1.632 1. .. f4
1 0.0 +++ 1. .. Kf6
1 0.0 -1.568 1. .. Kf6
1 0.0 +++ 1. .. Rd6
1 0.0 -0.352 1. .. Rd6
1 0.8 -0.352 1. .. Rd6
2 0.8 -0.544 1. .. Rd6 2. Ke2
2 0.8 -0.544 1. .. Rd6 2. Ke2
3 0.8 -0.464 1. .. Rd6 2. Ke2 Kf6
3 0.9 -0.464 1. .. Rd6 2. Ke2 Kf6
4 0.9 -0.656 1. .. Rd6 2. Ke2 Kf6 3. Ke3
4 1.0 -0.656 1. .. Rd6 2. Ke2 Kf6 3. Ke3
5 1.0 -0.592 1. .. Rd6 2. Ke2 Kf6 3. Ra7 h5
5 1.0 -0.592 1. .. Rd6 2. Ke2 Kf6 3. Ra7 h5
6 1.1 -0.720 1. .. Rd6 2. Ke2 h5 3. Ra8 f4 4. Rg8+ Kf5
6 1.2 -0.720 1. .. Rd6 2. Ke2 h5 3. Ra8 f4 4. Rg8+ Kf5
7 1.4 -0.592 1. .. Rd6 2. Ke2 Kf6 3. Ra7 h6 4. Ke3 Ke5
7 1.7 -0.592 1. .. Rd6 2. Ke2 Kf6 3. Ra7 h6 4. Ke3 Ke5
8 3.0 --- 1. .. Rd6
8 3.6 -0.976 1. .. Rd6 2. a4 Kg5 3. a5 Rd1+ 4. Ke2 Ra1 5. Ra7 Rxa5
8 4.2 -0.976 1. .. Rd6 2. a4 Kg5 3. a5 Rd1+ 4. Ke2 Ra1 5. Ra7 Rxa5
9 4.6 --- 1. .. Rd6
9 4.8 -1.328 1. .. Rd6 2. a4 Kg5 3. a5 Rd1+ 4. Ke2 Ra1 5. Rxb6 Rxa5 6.
Rd6
9 4.9 +++ 1. .. Rd1+
9 5.0 -1.248 1. .. Rd1+ 2. Ke2 Rd6 3. a4 Rf6 4. a5 bxa5 5. Rxa5 Rd6 6.
Ke3
9 5.1 +++ 1. .. Rb8
9 5.4 -0.992 1. .. Rb8 2. Ke2 Kf6 3. a4 Kg5 4. Ke3 h5 5. f3 exf3 6.
Kxf3
9 5.6 -0.992 1. .. Rb8 2. Ke2 Kf6 3. a4 Kg5 4. Ke3 h5 5. f3 exf3 6.
Kxf3
[snip]
18 59:41 -1.168 1. .. Rb8 2. f3 exf3 3. Kf2 Kg5 4. Kxf3 Rd8 5. Rxb6 Rd3+
6. Ke2 Rh3 7. a4 Rxh2+ 8. Kd3 Rh3+ 9. Kc4 Rh4+ 10. Kb3
Re4 11. Rb4
18 99:46 -1.168 1. .. Rb8 2. f3 exf3 3. Kf2 Kg5 4. Kxf3 Rd8 5. Rxb6 Rd3+
6. Ke2 Rh3 7. a4 Rxh2+ 8. Kd3 Rh3+ 9. Kc4 Rh4+ 10. Kb3
Re4 11. Rb4
Nodes = 1918522858, QPerc: 70 %, time = 8668.79 secs, 221.3 kN/s
Extensions: Check: 95157866 DblChk: 336574 DiscChk: 1059852 SingReply:
4434081
Recapture: 5844859 Passed Pawn: 22774318 Zugzwang: 1800
Hashing: Trans: 41323067/569415316 = 0 % Pawn: 737949315/743321551 = 1 %
Eval: 604838439/1348159990 = 0 %
EGTB Hits/Probes = 16427/93671
Hashtable 1: entries = 2097152, use = 2053920
Black(1):
I'll be back.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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