[Bug-gnubg] Strange evaluation of position for hypergammon game

[Nikolay Marinov]

Hi All,

   I have a problem with gnubg evaluation in hypergammon games. I 
generated hyper3.bd, but in spite of this in some situtations evaluation 
of given postions is very bad. I will attach You a game log in ".mat" 
format in which you can see the last game of match where the correct 
decision is to remove last checker from opponents field. Instead gnubg 
evaluation program shows a hint (in 0ply,and 2ply) which keeps this 
checkers in opponents field, but in the next turn opponent 100% will win 
with backgammon. Also the coeficients in 0ply looks strange, because win 
coeficient is 1 in situation where losing game is 100%. If I evaluate 
all movements in 2ply gnubg shows that there is greater move. Do You 
have some ideas from where this confusion may come? I use gnubg 0.14 
version, in Windows XP SP2.

Regards,
Nikolay.

 9 point match

 Game 1
zero : 0                achilleas : 0
  1) 63: 23/17 17/14                42: 24/20 22/20
  2) 21: 24/22 14/13                52: 23/18 20/18
  3) 65: 22/16 16/11                54: 20/15 15/11
  4) 42: 22/18 11/9                52: 18/13 13/11
  5) 42: 13/9 18/16                21: 11/9* 11/10
  6) 33: 25/22 22/19 19/16* 9/6                51: 25/20 20/19*
  7) 32: 25/22 9/7*                54: 25/21 10/5
  8)  Doubles => 2                 Takes
  9) 43: 7/3 16/13                32: 19/16 16/14
  10) 42: 13/9 22/20*                22: 25/23 23/21 21/19(2)
  11) 41: 9/5 20/19                21: 14/12 12/11
  12) 41: 19/15 15/14*                32: 25/22* 22/20*
  13) 54: 25/20 25/21                63: 20/14 14/11*
  14) 21: 25/23 20/19                51: 19/14 19/18
  15) 33: 21/18 19/16 18/15 16/13                65: 18/12* 14/9
  16) 55: 25/20 23/18 18/13* 13/8                52: 25/20 11/9
  17) 41: 15/11 20/19                42: 20/16 16/14*
  18) 54: 25/20 8/4                42: 14/10 10/8
  19) 64: 20/14 19/15                 Doubles => 4
  20)  Drops                

 Game 2
zero : 0                achilleas : 2
  1)                         51: 24/19 23/22
  2) 33: 22/19 19/16 16/13 13/10                42: 19/15* 22/20
  3) 42: 25/23 24/20                33: 22/19 20/17 19/16 17/14
  4)  Doubles => 2                 Takes
  5) 62: 23/17 17/15                64: 16/10* 14/10
  6) 42: 25/21 21/19                51: 15/10 10/9
  7) 44: 23/19 20/16* 16/12 12/8                64: 25/19 19/15
  8) 31: 19/16 8/7                52: 15/10 10/8
  9) 54: 19/14 14/10                 Doubles => 4
  10)  Takes                32: 10/7 10/8
  11) 61: 16/10 7/6                51: 8/3 7/6
  12) 11: 10/9(2) 9/8(2)                42: 8/6 6/2
  13) 64: 8/2 8/4                31: 3/o 6/5
  14) 43: 4/o 6/3                51: 5/o 2/1
  15) 21: 3/1 2/1                42: 1/o


 Game 3
zero : 0                achilleas : 6
  1)                         42: 24/20 22/20
  2) 32: 24/21 23/21                32: 23/20 20/18
  3) 54: 21/16 16/12                44: 20/16(2) 16/12(2)
  4) 55: 22/17 21/16 17/12 12/7*                51: 25/20 20/19
  5) 66: 16/10 12/6* 10/4 7/1                54: 25/21* 21/16
  6) 21: 25/24 6/4                11: 12/11(2) 11/10(2)
  7) 52: 24/19 19/17                33: 10/7(2) 7/4(2)
  8) 54: 17/12 12/8                21: 16/14 14/13
  9) 61: 8/2 4/3                 Wins 1 points


 Game 4
zero : 1                achilleas : 6
  1)                         65: 23/17 22/17
  2) 54: 23/18 18/14                31: 24/21 21/20
  3) 22: 22/20 20/18 14/12 12/10                62: 20/14 17/15*
  4) 21: 25/24 18/16                31: 17/14 15/14
  5) 51: 16/15 15/10                66: 14/8(3) 8/2
  6) 54: 24/19 24/20                11: 8/7(2) 7/6(2)*
  7) 63: 25/22 20/14                65: 6/o 6/1
  8) 62: 10/4 4/2                11: 2/1 1/o(2)