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Subject: Re: endgame test position

Author: Uri Blass

Date: 22:42:49 01/19/05

Go up one level in this thread


On January 19, 2005 at 23:57:03, Jon Dart wrote:

>[D] 4R3/6p1/PK4kp/1PB2p2/8/3r4/3rp3/8 w - -
>
>How long to play a7?
>How long to give it a + score?
>
>Arasan plays a7 almost immediately but the score is still
>negative after several minutes.
>
>Pharaon 2.1 plays a7 in 24 seconds, gives a + score after
>158 seconds (Athlon 2500+).
>
>--Jon

Movei like arasan can find the move in a short time but negative score.
Fruit2 like Pharaon needs more time but have no problem with seeing positive
score after enough time.

Fruit2 finds the move with a draw score after 181 seconds(A3000)
positive score happens after 429 seconds

New game,
4R3/6p1/PK4kp/1PB2p2/8/3r4/3rp3/8 w - - 0 1

Analysis by Fruit 2.0:

1.Bg1
  -+  (-4.12)   Depth: 1/3   00:00:00
1.Bf2
  -+  (-3.91)   Depth: 1/3   00:00:00
1.Bb4
  -+  (-3.83)   Depth: 1/7   00:00:00
1.a7
  -+  (-3.00)   Depth: 1/7   00:00:00
1.a7 Ra2
  -+  (-3.22)   Depth: 2/8   00:00:00
1.a7 Rd8 2.Re7
  -+  (-3.43)   Depth: 3/8   00:00:00
1.a7 Rd8 2.Re6+ Kf7 3.Re7+ Kf6
  -+  (-3.67)   Depth: 4/9   00:00:00
1.Kc6 Rd8 2.Re6+ Kf7 3.Re7+ Kf6
  -+  (-3.63)   Depth: 4/11   00:00:00
1.Kc6 Rd8 2.Re6+ Kh5 3.b6 f4
  -+  (-3.33)   Depth: 5/15   00:00:00
1.Kc6 Rd8 2.Re6+ Kf7 3.Re7+ Kf6 4.b6 g5
  -+  (-3.65)   Depth: 6/15   00:00:00  14kN
1.Kc6 Rd8 2.Re6+ Kf7 3.Re5 Re8 4.Rxe8 Kxe8
  -+  (-4.23)   Depth: 7/19   00:00:00  40kN
1.a7 Rd8 2.Re6+ Kf7 3.Re7+ Kf6 4.Re3 Rc8 5.Kb7
  -+  (-3.57)   Depth: 7/19   00:00:00  50kN
1.a7 Rd8 2.Re6+ Kf7 3.Re7+ Kf6 4.Re3 Ra8 5.Be7+ Kf7 6.Bb4
  -+  (-3.73)   Depth: 8/19   00:00:01  87kN
1.a7 Rd8 2.Re6+ Kf7 3.Re7+ Kf6 4.Re3 Rh8 5.Bb4 Ra2 6.Re7
  -+  (-3.50)   Depth: 9/21   00:00:01  258kN
1.a7 Rd8 2.Rxd8 Rxd8 3.Bb4 f4 4.Kb7 Kf6 5.b6 Ke5 6.a8Q Rxa8 7.Kxa8
  -+  (-3.05)   Depth: 10/24   00:00:01  486kN
1.a7 Rd8 2.Rxd8 Rxd8 3.Bb4 f4 4.Kb7 Kf6 5.b6 Ke5 6.a8Q Rxa8 7.Kxa8
  -+  (-3.05)   Depth: 11/24   00:00:01  709kN
1.a7 Rd8 2.Rxd8 Rxd8 3.Bb4 f4 4.Kc7 Re8 5.Kb7 Kf6 6.b6 Ke5 7.a8Q Rxa8 8.Kxa8
  -+  (-3.05)   Depth: 12/25   00:00:01  1257kN
1.a7 Rd8 2.Rxd8 Rxd8 3.Bf2 f4 4.Kb7 Kf6 5.a8Q Rxa8 6.Kxa8 Ke5 7.Kb7
  -+  (-3.04)   Depth: 13/26   00:00:02  2471kN
1.Bf2 Rd8 2.Rxd8 Rxd8 3.Kc7 Re8 4.b6 e1Q 5.Bxe1 Rxe1 6.b7 Rc1+ 7.Kd6 Rb1
  -+  (-2.86)   Depth: 13/32   00:00:10  9991kN
1.Bf2 Ra2 2.a7 Rda3 3.Kb7 Kf7 4.a8Q Rxa8 5.Rxa8 Rxa8 6.Kxa8 Ke7 7.b6 Kd7
  -+  (-2.46)   Depth: 14/37   00:00:23  22855kN
1.Bf2 Ra2 2.a7 Rda3 3.Kb7 e1Q 4.Rxe1 Rxf2 5.b6 f4 6.Re8 f3 7.a8Q Rxa8 8.Rxa8
  -+  (-2.39)   Depth: 15/37   00:00:42  42681kN
1.Bf2 Ra2 2.a7 Rd1 3.Rxe2 Rxe2 4.a8Q Rxf2 5.Qe8+ Kh7 6.Qe3 Rc2 7.Qf3 Rd6+ 8.Ka5
Rf6 9.Qd3 Rb2
  -+  (-2.11)   Depth: 16/39   00:01:38  97916kN
1.Bf2 Ra2 2.a7 Rd1 3.Rxe2 Rxe2 4.a8Q Rxf2 5.Qe8+ Kh7 6.Kc6 Rc2+ 7.Kb7 Rb1 8.Qe5
Kg6 9.Qe8+ Kg5 10.Qe7+ Kf4 11.b6
  -+  (-2.09)   Depth: 17/45   00:02:34  153749kN
1.a7 Rd8 2.Rxd8 Rxd8 3.Bf2 Kf7 4.Kb7 Rd7+ 5.Kb6 Rd8
  =  (0.00)   Depth: 17/46   00:03:01  179446kN
1.a7 Rd8 2.Rxd8 Rxd8 3.Bf2 Kh5 4.Kb7 Rd7+ 5.Ka6 Rd1 6.a8Q Ra1+ 7.Kb7 Rxa8 8.Kxa8
Kg4 9.b6 Kf3 10.Be1 f4
  +-  (1.44)   Depth: 18/53   00:06:09  367104kN





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