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BQ: Hit or not hit? *** 4-ply analysis and ROLLOUT ***

Posted By: Daniel Murphy
Date: Saturday, 13 August 2011, at 1:42 p.m.

In Response To: BQ: Hit or not hit? *** 4-ply analysis and ROLLOUT *** (leobueno)

So, when we do a GNUbg analysis, how do we decide that this was a position that merited questioning the bot's analysis?

You can ask yourself some questions.

(1) Is this the play you would have made?

(2) Are one or more other plays very close to the recommended play?

(3) Is this is a position the bot understands?

(4) For Gnubg (only?), do 3-ply and 4-ply agree on the recommended play?

For this position, (1) (depending) and (3) apply. Looking ahead 4 turns is great, but a human can see further. The bot sees a blot and thinks more gammons and backgammons! The human sees that the critical point in the game will come many more turns than 4 from now. If White is to have any chance of winning or saving the gammon, White has to use the spares on the 6, 3 and 2 to make a backwards 4-prime. The best way to prevent that from happening is to leave White alone now so White's position can crash.

Messages In This Thread

• BQ: Hit or not hit?
  leobueno -- Thursday, 11 August 2011, at 11:29 p.m.
  • BQ: Hit or not hit?
    Dmitriy Obukhov -- Friday, 12 August 2011, at 2:15 a.m.
  • BQ: Hit or not hit?
    Casper van der Tak -- Friday, 12 August 2011, at 7:29 a.m.
  • BQ: Hit or not hit?
    neilkaz -- Friday, 12 August 2011, at 5:22 p.m.
  • BQ: Hit or not hit? *** 4-ply analysis and ROLLOUT ***
    leobueno -- Friday, 12 August 2011, at 6:47 p.m.
    • BQ: Hit or not hit? *** 4-ply analysis and ROLLOUT ***
      Casper van der Tak -- Friday, 12 August 2011, at 6:55 p.m.
    • 3-ply trunc. rollout
      mtuhtan -- Saturday, 13 August 2011, at 9:27 a.m.
      • 3-ply full rollout
        mtuhtan -- Saturday, 13 August 2011, at 11:25 a.m.
    • BQ: Hit or not hit? *** 4-ply analysis and ROLLOUT ***
      Daniel Murphy -- Saturday, 13 August 2011, at 1:42 p.m.