I am aware of what you wrote, but the position doesn't look so tricky to get
fooled at 4 ply (compare to roll home a massive backgame for instance), hence
my question.
Pierre
-------------------------------
Le dimanche 1 novembre 2020 à 21:58:55 UTC+1, Joseph Heled
<[email protected]> a écrit :
You can probably write a 5kg book about positions where a bot plays different
moves at 0-ply and 1-ply. No bot is good at all types of positions.And
remember, to get the higher plies the bot need to "play" the position to this
depth. With a tricky position many moves might be inaccurate, so the higher ply
is not always correct as well.Same for rollouts.
-Joseph
On Mon, 2 Nov 2020 at 04:02, pierre zakia <[email protected]> wrote:
Hi everybody,
In the position here below, I am curious to understand what in Gnubg engine
yields such discrepancy between 4 ply and roll out.
GNU Backgammon ID de position: G27HAAiY2+ABAw
ID de match : MAHyAAAAAAAE
+12-11-10--9--8--7-------6--5--4--3--2--1-+ O: gnubg
| O O | | O O X | 0 point
| O O | | O O | Dés jetés 44
| | | O |
| | | |
| | | |
^| |BAR| | Match en 7 points (Videau : 1)
| | | |
| O | | |
| O X | | X |
| O X X X | | X O X X |
| O X X X | | X O X X | 0 point
+13-14-15-16-17-18------19-20-21-22-23-24-+ X: pierrez
Pip counts : O 148, X 106
4 ply results :
13/5 13/9(2) +0,579
0,684 0,135 0,005 - 0,316 0,098 0,002
20/16(2) 13/9(2) +0,570 ( -0,008)
0,675 0,083 0,003 - 0,325 0,082 0,001
13/5(2) +0,436 ( -0,143)
0,611 0,122 0,003 - 0,389 0,065 0,001</td>
Roll out :1. Roll out 20/16(2) 13/9(2) Eq.: +0,783
0,709 0,078 0,003 - 0,291 0,089 0,000 CL +0,415 CF +0,783
[0,011 0,006 0,000 - 0,011 0,012 0,012 CL 0,026 CF 0,053]
2. Roll out 13/5 13/9(2) Eq.: +0,576 ( -0,207)
0,675 0,138 0,004 - 0,325 0,101 0,002 CL +0,389 CF +0,576
[0,002 0,003 0,000 - 0,002 0,002 0,000 CL 0,004 CF 0,007]
3. Roll out 13/5(2) Eq.: +0,549 ( -0,233)
0,634 0,105 0,003 - 0,366 0,044 0,056 CL +0,338 CF +0,549
[0,008 0,009 0,001 - 0,008 0,007 0,055 CL 0,020 CF 0,049]
I am more interested in the relative equity (bold font) between the first 2
moves than in the respective absolute equity of the same moves.
Thanks in advance to shed some light on this.
Pierre
