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GNUBG RO Blunder(BGB/XBG right)

Posted By: Andreas
Date: Sunday, 28 June 2009, at 1:02 p.m.

The following strange GNUBG RO was originally posted by MartinB at Hardys Forum:

http://www.hardyhuebener.de/forum/index.php?topic=1018.0

The GNUBG RO underestimates strong blue's winning chances and favours the seemingly inferior play voluntaring a shot were better alternatives seem obvious.

FrankB demonstrated that BGB RO shows the blotless 8/2, 10/6 as best and winning probability ca. 96% in agreement with common sense - and not 87% as GNUBG thinks. I made a short RO with XBG showing similiar results.

GNUBG seems to play "erratic" in certain situtions.

Any comments here? Can we trust GNUBG RO re. book positions, openings etc. anyway? Needs GNUBG additional training for some situations?

The score is: white 2, GNUBG 4 (match to 5 points, Crawford play)

GNUBG to play 46

white270


2X2X ' ' ' ' ' ' ' ' ' '

bX2O3O2O2O2O2O1O '1O ' '

GNUBG75

• GNU moves 8/2 6/2

# Ply Move Equity
1 R 8/2 7/3 +0,747
0,8740,8030,651-0,1260,0030,000 +0,747 +0,747
0,0060,0080,013-0,0060,0010,000 0,012 0,012
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 855659799 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 8 more moves within equity 0,16
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]
2 R 10/4 8/4 +0,738 ( -0,009)
0,8690,8060,630-0,1310,0050,000 +0,738 +0,738
0,0050,0080,013-0,0050,0010,000 0,011 0,011
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 855659799 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 8 more moves within equity 0,16
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]
3 R 10/6 8/2 +0,736 ( -0,011)
0,8680,8040,632-0,1320,0040,000 +0,736 +0,736
0,0050,0080,013-0,0050,0010,000 0,011 0,011
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 855659799 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 8 more moves within equity 0,16
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]
• 4 R 8/2 6/2 +0,730 ( -0,017)
0,8650,8010,622-0,1350,0060,000 +0,730 +0,730
0,0050,0080,013-0,0050,0020,000 0,010 0,010
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 855659799 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 8 more moves within equity 0,16
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]
5 R 10/4 6/2 +0,724 ( -0,023)
0,8630,7980,610-0,1370,0060,000 +0,724 +0,724
0,0050,0080,013-0,0050,0020,000 0,010 0,010
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 855659799 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 8 more moves within equity 0,16
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]
6 R 10/4 7/3 +0,720 ( -0,027)
0,8600,7840,622-0,1400,0040,000 +0,720 +0,720
0,0060,0080,012-0,0060,0010,000 0,012 0,012
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 855659799 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 8 more moves within equity 0,16
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]

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