ABK

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ABK, (Arena's book format)
the opening book format of Arena. It persists a book tree as array of entries, each entry referring one book move with priority and statistics, an entry index of the next move inside a book line (> 0 if any), and an entry index of a possible sibling move (>= 0 if any). The sizeof of an entry is 28, the initial position indexed by 900 [1].

Entry Structure

The array of entries/structures is written to / read from a binary file under Windows (x86), struct and integers implicitely stored little-endian wise:
struct SBookMoveEntry {
  char from;      /* a1 0, b1 1, ..., h1 7, ... h8 63 */
  char to;        /* a1 0, b1 1, ..., h1 7, ... h8 63 */
  char promotion; /* 0 none, +-1 rook, +-2 knight, +-3 bishop, +-4 queen */
  char priority;
  int ngames;
  int nwon;
  int nlost;
  int plycount;
  int nextMove;
  int nextSibling;
} * pOpeningBook;

Sample Tree

  root index
      ▼
┌───────────┐                                  ┌───────────┐  
│nextSibling│ ─────────────── ► ────────────── │nextSibling│ ─────────────── ► ... 
├───────────┤                                  ├───────────┤  
│   e2-e4   │                                  │   d2-d4   │  
├───────────┤                                  ├───────────┤  
│ nextMove  │                                  │ nextMove  │  
└───────────┘                                  └───────────┘  
      ▼                                              ▼
┌───────────┐ ┌───────────┐ ┌───────────┐      ┌───────────┐ ┌───────────┐ ┌───────────┐ ┌───────────┐     ┌───────────┐ 
│nextSibling│►│nextSibling│►│nextSibling│►...  │nextSibling│►│nextSibling│►│nextSibling│►│nextSibling│►...►│nextSibling│ 
├───────────┤ ├───────────┤ ├───────────┤      ├───────────┤ ├───────────┤ ├───────────┤ ├───────────┤     ├───────────┤ 
│   e7-e5   │ │   c7-c5   │ │   e6-e6   │      │   d7-d5   │ │   g8-f6   │ │   c7-c6   │ │   e7-e6   │     │   f7-f5   │ 
├───────────┤ ├───────────┤ ├───────────┤      ├───────────┤ ├───────────┤ ├───────────┤ ├───────────┤     ├───────────┤ 
│ nextMove  │ │ nextMove  │ │ nextMove  │      │ nextMove  │ │ nextMove  │ │ nextMove  │ │ nextMove  │     │ nextMove  │ 
└───────────┘ └───────────┘ └───────────┘      └───────────┘ └───────────┘ └───────────┘ └───────────┘     └───────────┘ 
      ▼             ▼             ▼                  ▼             ▼             ▼              ▼                ▼
┌───────────┐      ...      ┌───────────┐      ┌───────────┐      ...           ...      ┌───────────┐          ...
│nextSibling│►...           │nextSibling│►...  │nextSibling│►...                         │nextSibling│►...
├───────────┤               ├───────────┤      ├───────────┤                             ├───────────┤ 
│   g1-f3   │               │   d2-d4   │      │   c2-c4   │                             │   e2-e4   │ 
├───────────┤               ├───────────┤      ├───────────┤                             ├───────────┤ 
│ nextMove  │               │ nextMove  │      │ nextMove  │                             │ nextMove  │ 
└───────────┘               └───────────┘      └───────────┘                             └───────────┘ 
     ▼                            ▼                  ▼                                         ▼
    ...                          ...                ...                                       ...

See also


Forum Posts

2007 ...

2010 ...


External Links


References

  1. ^ Re: Opening books format by Jury Osipov, CCC, April 15, 2008
  2. ^ Scid / Scid vs. PC - ChessBase (.ctg) and Arena (.abk) by Norbert Raimund Leisner, CCC, August 19, 2016

What links here?

Page Date Edited
ABK Feb 1, 2017
Arena Mar 16, 2018
CTG Aug 22, 2016
Dictionary Aug 24, 2017
Fauzi Akram Dabat Jan 23, 2017
Opening Book Feb 26, 2018
Scid vs. PC Jan 21, 2018
Scidb Mar 18, 2018

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