Two tables representation Chess960 numbering scheme

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1 2 tables representation

1.1 example
1.2 king s table
1.3 bishop s table





two tables representation

these 2 tables serve quick mapping of arbitrary chess960 starting position (short: sp) @ white s base row random number between 0 , 959. first search same or nearest smaller number king s table. determine difference (0 15) drawn number , select matching bishops positioning bishop s table. according first place both bishops @ first base row, 6 pieces in sequence of found row of king s table upon 6 free places left over. black pieces placed symmetrically white s base row.


example

this sp-518 arrangement. in king s table find no. 512 rnqknr . remainder 6 find --b--b-- in bishop s table @ no. 6. altogether sp-518 = 512+6 result in known white starting array rnbqkbnr traditional chess.


king s table

bishop s table






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