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Created page with "'''Home * People * Ryan Mack''' '''Ryan Mack''',<br/> in the late 90s an American teen programmer and inventor of the Reverse Bitboards when he was a 16..."
'''[[Main Page|Home]] * [[People]] * Ryan Mack'''
'''Ryan Mack''',<br/>
in the late 90s an American teen programmer and inventor of the [[Reverse Bitboards]] when he was a 16 year old schoolboy. In 2000, while introducing his ''Hyperbola Project'', he explained the <span style="background-color: #c0c0c0;">x XOR (x - 2)</span> [[Bit-Twiddling|bit-twiddling]] trick as the basic idea of Reverse Bitboards, essentially [[Subtracting a Rook from a Blocking Piece|subtracting a rook from a blocking piece]], where the changed bits masked on a line remain the sliding [[On an empty Board#RayAttacks|ray-attacks]] in [[On an empty Board#PositiveRays|positive]] [[Rays#RayDirections|ray-directions]]. His idea to keep a [[Flipping Mirroring and Rotating#Rotationby180degrees|reversed or 180 degree rotated]] [[Occupancy|occupancy]] to apply the same trick for [[On an empty Board#NegativeRays|negative]] ray-directions to yield reversed attack bitboards, either requiring bitboard reversal or disjoint [[Bitboard Serialization|serialization]] with reversion in the square centric world by [[General Setwise Operations#ExclusiveOr|xor]] 63, turned out to be not that successful as the young author initially thought and claimed. However, [[Hyperbola Quintessence]], where fast vertical byteswap flipping is used on the fly to reverse [[Diagonals|diagonals]] and [[Files|files]], is somehow the resurrection of Ryan's ideas, vastly improved by [[Aleks Peshkov|Aleks Peshkov's]] xor wizardry.
=Forum Posts=
* [https://groups.google.com/d/msg/rec.games.chess.computer/DyRXuLL37q8/gFPq_JQGRQoJ Software Speed Question] by Ryan Mack, [[Computer Chess Forums|rgcc]], May 02, 1998
* [https://groups.google.com/d/msg/rec.games.chess.computer/UZwoz0ubwVo/ys-MW8rQCEUJ NEW ENGINE IN PROGRESS WILL BLOW CRAFTY AWAY] by Ryan Mack, [[Computer Chess Forums|rgcc]], August 08, 1999
* [https://groups.google.com/d/msg/rec.games.chess.computer/eLB67qqGjpY/7Pe5nt2NVAUJ Re: Need Advice: Pent III or AMD Athlon ? for Chess Programs] by Hyperbola, [[Computer Chess Forums|rgcc]], December 29, 1999
'''[[People|Up one Level]]'''
'''Ryan Mack''',<br/>
in the late 90s an American teen programmer and inventor of the [[Reverse Bitboards]] when he was a 16 year old schoolboy. In 2000, while introducing his ''Hyperbola Project'', he explained the <span style="background-color: #c0c0c0;">x XOR (x - 2)</span> [[Bit-Twiddling|bit-twiddling]] trick as the basic idea of Reverse Bitboards, essentially [[Subtracting a Rook from a Blocking Piece|subtracting a rook from a blocking piece]], where the changed bits masked on a line remain the sliding [[On an empty Board#RayAttacks|ray-attacks]] in [[On an empty Board#PositiveRays|positive]] [[Rays#RayDirections|ray-directions]]. His idea to keep a [[Flipping Mirroring and Rotating#Rotationby180degrees|reversed or 180 degree rotated]] [[Occupancy|occupancy]] to apply the same trick for [[On an empty Board#NegativeRays|negative]] ray-directions to yield reversed attack bitboards, either requiring bitboard reversal or disjoint [[Bitboard Serialization|serialization]] with reversion in the square centric world by [[General Setwise Operations#ExclusiveOr|xor]] 63, turned out to be not that successful as the young author initially thought and claimed. However, [[Hyperbola Quintessence]], where fast vertical byteswap flipping is used on the fly to reverse [[Diagonals|diagonals]] and [[Files|files]], is somehow the resurrection of Ryan's ideas, vastly improved by [[Aleks Peshkov|Aleks Peshkov's]] xor wizardry.
=Forum Posts=
* [https://groups.google.com/d/msg/rec.games.chess.computer/DyRXuLL37q8/gFPq_JQGRQoJ Software Speed Question] by Ryan Mack, [[Computer Chess Forums|rgcc]], May 02, 1998
* [https://groups.google.com/d/msg/rec.games.chess.computer/UZwoz0ubwVo/ys-MW8rQCEUJ NEW ENGINE IN PROGRESS WILL BLOW CRAFTY AWAY] by Ryan Mack, [[Computer Chess Forums|rgcc]], August 08, 1999
* [https://groups.google.com/d/msg/rec.games.chess.computer/eLB67qqGjpY/7Pe5nt2NVAUJ Re: Need Advice: Pent III or AMD Athlon ? for Chess Programs] by Hyperbola, [[Computer Chess Forums|rgcc]], December 29, 1999
'''[[People|Up one Level]]'''
