Author: Dan Homan
Date: 03:16:56 05/19/99
Go up one level in this thread
On May 18, 1999 at 20:18:09, Jon Dart wrote:
>Here is an interesting endgame position with unbalanced material,
>from a recent game Arasan vs. Rajah on ICC:
>
>8/6k1/4P3/1b1n1P2/6PK/8/p7/4R3 b - -
>
EXchess likes Kf6 from ply 1 on... Here is the output. - Dan
7. -0.74 1 52010 1. ... Kf6 2. Ra1 Bc4 3. Kg3 Nc3 4. Re1 Bd5
7. -0.74 1 69130 1. ... Kf6 2. Ra1 Bc4 3. Kg3 Nc3 4. Re1 Bd5
8. -0.75 2 229496 1. ... Kf6 2. Kg3 Be2 3. Ra1 Bc4 4. Rd1 Ne3 5. Rc1
8. -0.75 4 361229 1. ... Kf6 2. Kg3 Be2 3. Ra1 Bc4 4. Rd1 Ne3 5. Rc1
9. -0.56 12 1237242 1. ... Kf6 2. Kg3 Ne3 3. Rc1 Bc4 4. Kf4 Nxf5
5. gxf5 Bxe6
9. -0.56 18 1874686 1. ... Kf6 2. Kg3 Ne3 3. Rc1 Bc4 4. Kf4 Nxf5
5. gxf5 Bxe6
10. -0.53 25 2679941 1. ... Kf6 2. Kg3 Ne3 3. Ra1 Bc4 4. Kf3 Nc2
5. Rxa2 Bxa2 6. Kf4
10. -0.53 28 3036921 1. ... Kf6 2. Kg3 Ne3 3. Ra1 Bc4 4. Kf3 Nc2
5. Rxa2 Bxa2 6. Kf4
11. -0.46 68 7204272 1. ... Kf6 2. Kg3 Bc4 3. Ra1 Ke7 4. Rh1 Nc3
5. g5 Bxe6 6. fxe6 Kxe6
11. -0.46 76 8125014 1. ... Kf6 2. Kg3 Bc4 3. Ra1 Ke7 4. Rh1 Nc3
5. g5 Bxe6 6. fxe6 Kxe6
12. -0.46 135 14100049 1. ... Kf6 2. Kg3 Bc4 3. Ra1 Ne3 4. Kf4 Nd5+
5. Ke4 Nb4 6. Rg1 Bxe6 7. g5+ Ke7 8. fxe6
12. -0.46 158 16453651 1. ... Kf6 2. Kg3 Bc4 3. Ra1 Ne3 4. Kf4 Nd5+
5. Ke4 Nb4 6. Rg1 Bxe6 7. g5+ Ke7 8. fxe6
13. -0.53 221 22683763 1. ... Kf6 2. Kg3 Bc4 3. Ra1 Ne3 4. Kf4 Nd5+
5. Kf3 Nb4 6. Ke4 Nc2 7. Rxa2 Bxa2 8. Kf4
13. -0.53 294 30124588 1. ... Kf6 2. Kg3 Bc4 3. Ra1 Ne3 4. Kf4 Nd5+
5. Kf3 Nb4 6. Ke4 Nc2 7. Rxa2 Bxa2 8. Kf4
>Crafty 16.6 likes Kf6 here and gives it a draw score. However, when
>I forced it to search Ne3, it does this:
>
> 11-> 5.34 -2.33 1. ... Ne3 2. Kg5 Nc2 3. f6+ Kg8 4.
> Rh1 a1=Q 5. Rxa1 Nxa1 6. Kf4 Nc2 7.
> g5
> 12 9.77 ++ 1. ... Ne3!!
> 12 3:52 -1.89 1. ... Ne3 2. Kg5 Nc2 3. f6+ Kg8 4.
> Rh1 a1=Q 5. Rxa1 Nxa1 6. f7+ Kg7 7.
> Kf4 Kf8 8. g5
> 12-> 3:52 -1.89 1. ... Ne3 2. Kg5 Nc2 3. f6+ Kg8 4.
> Rh1 a1=Q 5. Rxa1 Nxa1 6. f7+ Kg7 7.
> Kf4 Kf8 8. g5
> 13 4:46 -1.54 1. ... Ne3 2. Ra1 Bc4 3. e7 Kf7 4.
> f6 Nc2 5. Rxa2 Bxa2 6. g5 Ne3 7. g6+
> Ke8 8. Kg3 Bf7
> 13-> 4:46 -1.54 1. ... Ne3 2. Ra1 Bc4 3. e7 Kf7 4.
> f6 Nc2 5. Rxa2 Bxa2 6. g5 Ne3 7. g6+
> Ke8 8. Kg3 Bf7
> 14 5:38 -1.54 1. ... Ne3 2. Ra1 Bc4 3. e7 Kf7 4.
> f6 Nc2 5. Rxa2 Bxa2 6. g5 Ke8 7. g6
> Ne3 8. Kg3 Bf7
> 14-> 5:38 -1.54 1. ... Ne3 2. Ra1 Bc4 3. e7 Kf7 4.
> f6 Nc2 5. Rxa2 Bxa2 6. g5 Ke8 7. g6
> Ne3 8. Kg3 Bf7
>
>Note the really long time to get through ply 12! It seems like it
>settles on a score of -1.5 but it looks steady so maybe Black can
>draw this way, too.
>
>I have recently put some fixes into Arasan for pawn race scoring
>- now it prefers Ne3 for a long time but eventually switches to Kf6.
>However, it still gives a + score for Black.
>
>I would be interested to know what other programs think of this
>position.
>
>--Jon
>
>
>
>--Jon
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