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Explain this voluntary direct please

Posted By: Rich Munitz
Date: Friday, 12 February 2010, at 9:01 p.m.

In Response To: Explain this voluntary direct please (Christian Munk-Christensen)

"I am surprised that the bot can see these things with its limited lookahead."

Vision is a big part of this, and a bot's lookahead only provides so much of that.

We can see that XG 1-ply (no lookahead) thinks it is a fairly big error to volunteer a shot here.

is Player 2

score: 4
pip: 94
5 point match
pip: 121
score: 2

is Player 1
XGID=---BbBC-CBB------a-bbbcbaA:1:-1:-1:44:2:4:0:5:10
to play 44

1.1 ply6/2(2) 5/1(2)eq: -0.648
Player:
Opponent:		 31.82% (G:3.75% B:0.01%)
68.18% (G:14.22% B:0.47%)
2.1 ply8/4 6/2(2) 5/1eq: -0.723 (-0.075)
Player:
Opponent:		 28.63% (G:3.44% B:0.01%)
71.37% (G:14.79% B:0.52%)
3.1 ply8/4 6/2 5/1(2)eq: -0.725 (-0.077)
Player:
Opponent:		 27.45% (G:2.78% B:0.01%)
72.55% (G:13.69% B:0.47%)

eXtreme Gammon Version: 1.12, MET: GnuBG 11 point

2-ply is not much better

is Player 2

score: 4
pip: 94
5 point match
pip: 121
score: 2

is Player 1
XGID=---BbBC-CBB------a-bbbcbaA:1:-1:-1:44:2:4:0:5:10
to play 44

1.2 ply6/2(2) 5/1(2)eq: -0.692
Player:
Opponent:		 31.28% (G:4.82% B:0.00%)
68.72% (G:15.88% B:0.50%)
2.2 ply8/4 6/2 5/1(2)eq: -0.744 (-0.052)
Player:
Opponent:		 29.07% (G:4.57% B:0.00%)
70.93% (G:16.25% B:0.39%)
3.2 ply8/4 6/2(2) 5/1eq: -0.756 (-0.064)
Player:
Opponent:		 29.67% (G:4.67% B:0.00%)
70.33% (G:17.47% B:0.31%)

eXtreme Gammon Version: 1.12, MET: GnuBG 11 point

3-Ply however finally sees the light. Clearly being able to look at the positions in which the blot is hit and has to play from the roof, vs how things play when there is no checker on the roof is where it starts to notice the advantages of being hit. Clearly the rollout shows that the advantages are even greater than what 3-ply can see.

is Player 2

score: 4
pip: 94
5 point match
pip: 121
score: 2

is Player 1
XGID=---BbBC-CBB------a-bbbcbaA:1:-1:-1:44:2:4:0:5:10
to play 44

1.3 ply8/4 6/2(2) 5/1eq: -0.726
Player:
Opponent:		 28.11% (G:2.96% B:0.01%)
71.89% (G:14.43% B:0.45%)
2.3 ply8/4 6/2 5/1(2)eq: -0.739 (-0.013)
Player:
Opponent:		 27.46% (G:2.68% B:0.01%)
72.54% (G:14.43% B:0.43%)
3.3 ply6/2(2) 5/1(2)eq: -0.746 (-0.019)
Player:
Opponent:		 29.63% (G:3.08% B:0.01%)
70.37% (G:16.92% B:0.51%)

eXtreme Gammon Version: 1.12, MET: GnuBG 11 point

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