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Why do bots have an even/odd effect?

Posted By: Maik Stiebler
Date: Tuesday, 18 August 2009, at 6:14 a.m.

In Response To: Why do bots have an even/odd effect? (Tom Keith)

This makes a lot of sense, but isn't it true that the even/odd effect has a direction? I just checked and in my sample 1-ply eval equity was typically lower than 0-ply or 2-ply, for both sides in a sequence of moves from one of my matches. Does anything you have written so far address that effect (sorry if I missed it)? If not, do you agree that effect exists? If so, has it ever been witnessed in other bots (someone on rgb, I vaguely recall, blamed the effect on the way tree search is done, which, I suppose, should be the same for most bots)?

Messages In This Thread

• Falafel to play 41
  Stick -- Monday, 10 August 2009, at 3:33 a.m.
  • Falafel to play 41
    Havard Raddum -- Monday, 10 August 2009, at 6:31 a.m.
  • Falafel to play 41
    sonrik -- Monday, 10 August 2009, at 6:51 a.m.
  • Falafel to play 41
    mamabear -- Monday, 10 August 2009, at 1:06 p.m.
  • Falafel to play 41
    Keene -- Monday, 10 August 2009, at 3:51 p.m.
  • Falafel to play 41
    garyo -- Monday, 10 August 2009, at 4:37 p.m.
  • Falafel to play 41
    Gustavo Goldfarb -- Monday, 10 August 2009, at 4:56 p.m.
  • Falafel to play 41
    Fabrice Liardet -- Monday, 10 August 2009, at 8:01 p.m.
  • Rollout
    Stick -- Tuesday, 11 August 2009, at 1:21 a.m.
    • Rollout
      neilkaz -- Tuesday, 11 August 2009, at 3:22 a.m.
    • Rollout
      ScottyK -- Tuesday, 11 August 2009, at 1:57 p.m.
      • Re: GNU 4 ply..GV etc
        neilkaz -- Tuesday, 11 August 2009, at 3:07 p.m.
      • Plies again
        Matt Cohn-Geier -- Tuesday, 11 August 2009, at 4:45 p.m.
        • Plies again
          Chuck Bower -- Tuesday, 11 August 2009, at 8:43 p.m.
          • Plies again
            Matt Cohn-Geier -- Wednesday, 12 August 2009, at 3:26 a.m.
            • Plies again
              Chuck Bower -- Wednesday, 12 August 2009, at 1:48 p.m.
        • Plies again
          ScottyK -- Tuesday, 11 August 2009, at 9:28 p.m.
          • Plies again
            Keene -- Tuesday, 11 August 2009, at 9:59 p.m.
            • Plies again
              ScottyK -- Tuesday, 11 August 2009, at 10:23 p.m.
        • Plies again
          playBunny -- Tuesday, 11 August 2009, at 11:15 p.m.
          • Plies again
            MaX -- Wednesday, 12 August 2009, at 11:29 a.m.
            • Plies again
              playBunny -- Wednesday, 12 August 2009, at 1:15 p.m.
              • Why do bots have an even/odd effect?
                Tom Keith -- Wednesday, 12 August 2009, at 2:11 p.m.
                • Why do bots have an even/odd effect?
                  MaX -- Wednesday, 12 August 2009, at 3:27 p.m.
                • Why do bots have an even/odd effect?
                  playBunny -- Wednesday, 12 August 2009, at 7:51 p.m.
                  • Why do bots have an even/odd effect?
                    Tom Keith -- Thursday, 13 August 2009, at 1:54 p.m.
                    • Why do bots have an even/odd effect?
                      playBunny -- Thursday, 13 August 2009, at 4:50 p.m.
                  • Why do bots have an even/odd effect?
                    MaX -- Saturday, 15 August 2009, at 8:53 p.m.
                    • Why do bots have an even/odd effect?
                      Tom Keith -- Monday, 17 August 2009, at 11:16 p.m.
                      • Why do bots have an even/odd effect?
                        playBunny -- Tuesday, 18 August 2009, at 12:59 a.m.
                        • Why do bots have an even/odd effect?
                          Tom Keith -- Tuesday, 18 August 2009, at 12:44 p.m.
                          • Why do bots have an even/odd effect?
                            playBunny -- Tuesday, 18 August 2009, at 4:39 p.m.
                            • Why do bots have an even/odd effect?
                              Tom Keith -- Tuesday, 18 August 2009, at 5:45 p.m.
                      • Why do bots have an even/odd effect?
                        Maik Stiebler -- Tuesday, 18 August 2009, at 6:14 a.m.
                        • Why do bots have an even/odd effect?
                          Tom Keith -- Tuesday, 18 August 2009, at 12:46 p.m.
                      • Why do bots have an even/odd effect?
                        MaX -- Thursday, 20 August 2009, at 2:54 p.m.
                      • Gnubg odd/even effect extreme example ?
                        MaX -- Friday, 21 August 2009, at 2:19 p.m.
                        • Gnubg odd/even effect extreme example ?
                          Gregg Cattanach -- Friday, 21 August 2009, at 7:24 p.m.
                        • Gnubg odd/even effect extreme example ?
                          Frank Berger -- Saturday, 22 August 2009, at 6:02 a.m.
      • Rollout
        Rich Munitz -- Tuesday, 11 August 2009, at 7:35 p.m.
        • Rollout
          ScottyK -- Tuesday, 11 August 2009, at 9:22 p.m.
          • Rollout
            Rich Munitz -- Wednesday, 12 August 2009, at 12:14 a.m.
            • Rollout
              ScottyK -- Wednesday, 12 August 2009, at 1:23 a.m.
          • Rollout
            Chuck Bower -- Wednesday, 12 August 2009, at 1:52 p.m.
  • Falafel to play 41
    Toppace -- Wednesday, 12 August 2009, at 6:20 p.m.
    • Falafel to play 41
      Keene -- Wednesday, 12 August 2009, at 7:29 p.m.