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Interesting Evaluations of GnuBG

Posted By: poseidon
Date: Thursday, 19 July 2012, at 8:57 a.m.

There is something strange with the below evaluations of the same position from gnubg (1-ply and 3-ply):

a) 1-ply:

The score (after 0 games) is: gnubg 5, poseidon 2 (match to 7 points)

Move number 4: poseidon on roll, cube decision?

gnubg	83
poseidon	82
Position ID: 7O0NBAA29xYBAA Match ID: UQngAFAAEAAA

• poseidon doubles

Cube decision
1-ply cubeless equity		+0.207	(Money: +0.207)
	0.604 0.000 0.000 - 0.396 0.000 0.000
Cubeful equities:
1.	Double, pass	+1.000
2.	Double, take	+1.038	+0.038
3.	No double	+0.675	-0.325
Proper cube action:		Redouble, pass

B) 3-ply:

The score (after 0 games) is: gnubg 5, poseidon 2 (match to 7 points)

Move number 4: poseidon on roll, cube decision?

gnubg	83
poseidon	82
Position ID: 7O0NBAA29xYBAA Match ID: UQngAFAAEAAA

• poseidon doubles

Cube decision
3-ply cubeless equity		+0.207	(Money: +0.207)
	0.603 0.000 0.000 - 0.397 0.000 0.000
Cubeful equities:
1.	Double, pass	+1.000
2.	Double, take	+1.037	+0.037
3.	No double	+0.869	-0.131
Proper cube action:		Redouble, pass

What is strange is that although the evaluations of the same position (1-ply and 3-ply) were the same the cube evaluations were totally different. In fact in 1-ply it is a HUGE blunder not to double, where in 3-ply is it a just a normal blunder! The only thing that I can think of is the valuation of the joker rolls volality), of both black and red (responses).

Any ideas?

Messages In This Thread

• Interesting Evaluations of GnuBG
  poseidon -- Thursday, 19 July 2012, at 8:57 a.m.
  • Interesting Evaluations of GnuBG
    Casper van der Tak -- Thursday, 19 July 2012, at 9:40 a.m.
    • Interesting Evaluations of GnuBG
      Taper_Mike -- Thursday, 19 July 2012, at 7:20 p.m.
      • Interesting Evaluations of GnuBG
        Dmitriy Obukhov -- Thursday, 19 July 2012, at 11:54 p.m.
      • Interesting Evaluations of GnuBG
        Bob Koca -- Friday, 20 July 2012, at 1:15 a.m.
      • Interesting Evaluations of GnuBG
        poseidon -- Friday, 20 July 2012, at 1:18 p.m.
        • Interesting Evaluations of GnuBG
          Neil Robins -- Friday, 20 July 2012, at 1:58 p.m.
          • Interesting Evaluations of GnuBG
            Daniel Murphy -- Friday, 20 July 2012, at 2:53 p.m.