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From: | Christopher D. Yep |
Subject: | Re: [Bug-gnubg] Bug: Double/Beaver |
Date: | Thu, 21 Aug 2003 09:05:54 -0400 |
At 12:51 PM 8/21/2003 +0000, Jørn Thyssen wrote:
On Thu, Aug 21, 2003 at 08:35:25AM -0400, Christopher D. Yep wrote > Here is the output from Analyse - Evaluate: > > Win W(g) W(bg) L(g) L(bg) Equity Cubeful > static: 42.0% 34.2% 7.7% 12.8% 0.1% -0.159 +0.032 > 1 ply: 42.6% 28.6% 6.2% 11.1% 0.1% -0.148 -0.396 > 2 ply: 38.3% 28.2% 6.2% 14.7% 0.0% -0.235 -0.389 > > Cube analysis > 2-ply cubeless equity -0.038 > 38.3% 28.2% 6.2% - 61.7% 14.7% 0.0% > Cubeful equities: > 1. Double, take -0.236 > 2. Double, pass +1.000 ( +1.236) > 3. No double -0.389 ( -0.153) > Proper cube action: Double, beaver This is _before_ the double. Try _after_ the double!
Oops, I wasn't thinking clearly. My eyes were immediately drawn to the -0.235 without looking at the column headings!
No, the equity-column is supposed to be the cubeless equity, but I can see there is a small bug in the calculation. The cubeful column is the interesting one.
Right, the cubeless equities reported don't seem to match up with the win/gammon/backgammon figures reported. E.g. 2-ply cubeless equity should be .383 + .282 + .062 - (1 - .383) - .147 - .000 = -.037.
Here's Analyse - Evaluate after I move a 2-cube over to the other side: Win W(g) W(bg) L(g) L(bg) Equity Cubeful static: 42.0% 34.2% 7.7% 12.8% 0.1% +0.131 -0.066 1 ply: 42.6% 29.0% 6.8% 11.2% 0.1% +0.096 -0.083 2 ply: 38.3% 28.6% 7.1% 14.9% 0.0% -0.027 -0.107Ok, so now I match your reported numbers exactly (you wrote: "0.383 0.286 0.071 0.149 0.000 -0.027 -0.107"). But that means that there's another bug as -0.107 is quite different from -0.236.
Chris
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