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There is a more recent attempt to half the number of lookups by [[Martin Sedlak]] but using much larger tables <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73083&start=55 Re: Split Index Super Set Yielding (SISSY) Bitboards] by [[Martin Sedlak]], [[CCC]], February 14, 2021</ref>.
=Rook Attacks=
If combined with the [[First Rank Attacks#AttacksOnAllRanks|rank lookup]] for SISSY fileAttacks only, one can dense the occupy index range to 2, considering only blockers on the same file.
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73063 New RookAttacks() - possibly] by [[Michael Sherwin]], [[CCC]], February 12, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73083 Split Index Super Set Yielding (SISSY) Bitboards] by [[Michael Sherwin]], [[CCC]], February 13, 2020
: [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73083&start=46 Re: Split Index Super Set Yielding (SISSY) Bitboards] by [[Michael Sherwin]], [[CCC]], February 13, 2021
: [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73083&start=55 Re: Split Index Super Set Yielding (SISSY) Bitboards] by [[Martin Sedlak]], [[CCC]], February 14, 2021
=References=
