Opening Explorer

  • 5 years ago · Quote · #1


    Are there any plans to 

    1) Correct some of the ECO codes in the explorer and (more importantly)

    2) Fully include transpositions?


  • 5 years ago · Quote · #2


    what makes you think some of them are incorrect, and which ones?  and, why would you start a blog like this, instead of messaging staff directly about site problems, if such actually exist ?


    which transpositions are you referring to?  provide specifics please.  no one can shoot in the dark and actually find a target with any degree of accuracy, and few of Erik's staff have the time to waste, trying to figure out what you are meaning.


  • 5 years ago · Quote · #3


    Some are incorrect because they are inconsistent with other sites codes.

    As for transposition examples, the Botvinnik varation of the semi slav appears if on move 2 black plays e6, but it can equally occur if black plays c6 on move 2. If, however, I enter this in the game explorer (arriving at the same position via slightly different move orders) it does not appear.

    Lastly, this is not a blog, it's a forum post in the correct place, namely "Site feeback and suggestions".



  • 5 years ago · Quote · #4


    Botvinnik variation of the semi-slav = 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5

    Another move-order to this position : 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 Nf6 6.e4 b5

  • 5 years ago · Quote · #5


    Yes, game explorer seems to take into account only a specific path to a position rather than simply evaluating the position FEN when assigning an ECO.

  • 5 years ago · Quote · #6



  • 5 years ago · Quote · #8


    I thought that was a problem with the entire ECO system itself. Especially with all of the uncommon openings being thrown in one group.

  • 5 years ago · Quote · #9


    Actually, I think there is an issue where if the move order is different but you reach the same position, the stats are different, but I will double check and confirm.

    Thanks for the reply David.

  • 2 weeks ago · Quote · #10


    I'm looking at a line in the Sicilian Defense I played in a recent game.

    After 1.e4 c5 2.Nf3 e6, the move 3.Bc4 gets a score of 100%Black wins on 12 games.  But when you play the move, now it shows 356 games, and white has roughly 50% chances in those games.

    Supposing that this was the result of transposition issues, I tried the line changing the move order:

    1.e4 c5 2.Bc4 e6.  Inexplicably, the move 3.Nf3 also shows that Black wins 100% of 12 games, and once again, when you play the move it ALSO shows 356 games with the exact same winning/draw statistics.

    How can this be explained away by transposition?

    (Also posted in "Statistics Seem Odd in Game Explorer")

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