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[Bug-gnubg] Effective pip count (EPC) bug
From: |
Christopher D. Yep |
Subject: |
[Bug-gnubg] Effective pip count (EPC) bug |
Date: |
Fri, 05 Sep 2003 00:47:20 -0400 |
Windows XP, GUI version
version 0.14-dev 1.1345 030904
version 0.14-dev3D 1.1345 030904 [bug exists in both old and "3D" versions
of gnubg]
Set-up the following position:
GNU Backgammon Position ID: /wAAAP4BAAAAAA
Match ID : cAkAAAAAAAAA
+24-23-22-21-20-19------18-17-16-15-14-13-+ O: gnubg
OO | O | | | 0 points
OO | O | | |
O | O | | |
O | O | | |
O | 8 | | |
| |BAR| |v (Cube: 1)
X | 8 | | |
X | X | | |
X | X | | |
XX | X | | | On roll
XX | X | | | 0 points
+-1--2--3--4--5--6-------7--8--9-10-11-12-+ X: Chris
Then,
show onechequer
gnubg reports that each side has an EPC of 12.578 (and an avg. rolls (to
bearoff) of 12.578/8.167 = 1.540). This is incorrect; the correct EPC is
about 29.
Also, the onechequer statistics reverses the players. The pips, Avg.
rolls, Std. dev., EPC, and wastage numbers listed for player "gnubg" are
actually those of player "Chris" and vice-versa (the above is a symmetric
position, but change gnubg's position to 7 on the 1 pt. and 1 on the 2 pt.
for example).
Chris
- [Bug-gnubg] Effective pip count (EPC) bug,
Christopher D. Yep <=