Author: Dann Corbit
Date: 16:08:53 02/04/00
Go up one level in this thread
On February 04, 2000 at 18:26:04, Enrique Irazoqui wrote:
>In game 13 of their match, Nimzo (white) and Shredder reached this position.
>Nimzo showed an eval of -2, while Shredder with +7 quit the game and counts it
>as a win. I don't think that black can win this. Any opinions?
>
>Enrique
>
>[D]8/3k4/6R1/4r3/4nK2/2Pn4/1P6/8 w - - 0 1
The score may look dominant, but if white can trade rooks, it's a draw. The
crafty eval is closer to Shredder, but look at the position after we trace the
pv a few moves:
[D]8/3k4/8/6n1/3K4/2P5/1n6/8 w - -
That is clearly a draw.
Here is the crafty log:
end-game phase
clearing hash tables
time surplus 0.00 time limit 16:40 (16:40)
nss depth time score variation (1)
White(1): exit
8 0.62 -4.65 1. Ke3 Nxb2 2. Kd4 Rg5 3. Rh6 Nxc3
4. Kxc3 Rg2
8-> 0.68 -4.65 1. Ke3 Nxb2 2. Kd4 Rg5 3. Rh6 Nxc3
4. Kxc3 Rg2
9 2.10 -4.60 1. Ke3 Nxb2 2. Kd4 Rg5 3. Rh6 Nxc3
4. Kxc3 Rg2 5. Kd4
9-> 2.15 -4.60 1. Ke3 Nxb2 2. Kd4 Rg5 3. Rh6 Nxc3
4. Kxc3 Rg2 5. Kd4
10 11.47 -4.70 1. Ke3 Nc5+ 2. Kd2 Nxb2 3. Rh6 Nba4
4. c4 Nb2 5. Kc3 Nxc4 6. Kxc4
10-> 11.77 -4.70 1. Ke3 Nc5+ 2. Kd2 Nxb2 3. Rh6 Nba4
4. c4 Nb2 5. Kc3 Nxc4 6. Kxc4
11 14.35 -- 1. Ke3
11 49.77 -5.13 1. Ke3 Nc5+ 2. Kd2 Nxb2 3. Kc1 Nba4
4. Rg3 Ne4 5. Rd3+ Kc6 6. c4 Kc5 7.
Ra3 Kxc4 8. Rxa4+
11-> 52.18 -5.13 1. Ke3 Nc5+ 2. Kd2 Nxb2 3. Kc1 Nba4
4. Rg3 Ne4 5. Rd3+ Kc6 6. c4 Kc5 7.
Ra3 Kxc4 8. Rxa4+
12 55.04 -- 1. Ke3
12 2:26 -5.92 1. Ke3 Nc5+ 2. Kd4 Re4+ 3. Kd5 Nf4+
4. Kxc5 Nxg6 5. Kd5 Re5+ 6. Kd4 Rb5
7. b4 Ne5 8. Ke4 Kc6 9. Kd4 Rd5+ 10.
Ke4
12-> 2:29 -5.92 1. Ke3 Nc5+ 2. Kd4 Re4+ 3. Kd5 Nf4+
4. Kxc5 Nxg6 5. Kd5 Re5+ 6. Kd4 Rb5
7. b4 Ne5 8. Ke4 Kc6 9. Kd4 Rd5+ 10.
Ke4
13 6:18 -- 1. Ke3
13 8:50 -6.48 1. Ke3 Nxb2 2. Kd4 Rg5 3. Rxg5 Nxg5
4. Kd5 Ne6 5. Ke5 Nd3+ 6. Kd5 Nef4+
7. Kd4 Kc6 8. Kc4 Kb6
13-> 8:56 -6.48 1. Ke3 Nxb2 2. Kd4 Rg5 3. Rxg5 Nxg5
4. Kd5 Ne6 5. Ke5 Nd3+ 6. Kd5 Nef4+
7. Kd4 Kc6 8. Kc4 Kb6
time=16:40 cpu=99% mat=-4 n=198467175 fh=93% nps=198340
ext-> checks=11742229 recaps=111615 pawns=52794 1rep=194600
thrt:21793
predicted=0 nodes=198467175 evals=48548395
endgame tablebase-> probes done=41876 successful=41876
Quite frankly, I would make them play it out.
If I were white, I would do everything in my power to trade rooks, even if it
means giving away both of my pawns. If I am black, I will do everything in my
power to keep my rook, because it is the only realistic way to win. But we do
not know what the programs would do. Therefore, I think the only way to know
what would happen is to let it happen.
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