// CachedPosition.Data Bits
// 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
// 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
// To Horizon |Best From |Best To |BMP |Score |SP |Last Accessed
// Best From = Best Move From (one extra bit for illegal square)
// Best To = Best Move To (one extra bit for illegal square)
// BMP = Best Move Promoted Piece
// SP = Score Precision
static CachedPositionData()
{
// Create bit shifts and masks.
_toHorizonShift = 58;
_toHorizonMask = Bitwise.CreateULongMask(58, 63);
_toHorizonUnmask = Bitwise.CreateULongUnmask(58, 63);
_bestMoveFromShift = 51;
_bestMoveFromMask = Bitwise.CreateULongMask(51, 57);
_bestMoveFromUnmask = Bitwise.CreateULongUnmask(51, 57);
_bestMoveToShift = 44;
_bestMoveToMask = Bitwise.CreateULongMask(44, 50);
_bestMoveToUnmask = Bitwise.CreateULongUnmask(44, 50);
_bestMovePromotedPieceShift = 40;
_bestMovePromotedPieceMask = Bitwise.CreateULongMask(40, 43);
_bestMovePromotedPieceUnmask = Bitwise.CreateULongUnmask(40, 43);
_scoreShift = 10;
_scoreMask = Bitwise.CreateULongMask(10, 39);
_scoreUnmask = Bitwise.CreateULongUnmask(10, 39);
_scorePrecisionShift = 8;
_scorePrecisionMask = Bitwise.CreateULongMask(8, 9);
_scorePrecisionUnmask = Bitwise.CreateULongUnmask(8, 9);
_lastAccessedMask = Bitwise.CreateULongMask(0, 7);
_lastAccessedUnmask = Bitwise.CreateULongUnmask(0, 7);
}
// Move Bits
// Higher priority moves have higher ulong value.
// 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
// 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
// B|CapV |CapA |Promo |Kil|History |!|O|K|E|2|P|C|Q|From |To
// 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
// B = Best Move
// CapV = Capture Victim
// CapA = Capture Attacker (inverted)
// Promo = Promoted Piece
// Kil = Killer Move
// ! = Played
// O = Castling
// K = King Move
// E = En Passant Capture
// 2 = Double Pawn Move
// P = Pawn Move
// C = Check
// Q = Quiet (not capture, pawn promotion, castling, or check)
// From = From (one extra bit for illegal square)
// To = To (one extra bit for illegal square)
static Move()
{
// Create bit masks and shifts.
_bestShift = 63;
_bestMask = Bitwise.CreateULongMask(63);
_bestUnmask = Bitwise.CreateULongUnmask(63);
_captureVictimShift = 59;
_captureVictimMask = Bitwise.CreateULongMask(59, 62);
_captureVictimUnmask = Bitwise.CreateULongUnmask(59, 62);
_captureAttackerShift = 55;
_captureAttackerMask = Bitwise.CreateULongMask(55, 58);
_captureAttackerUnmask = Bitwise.CreateULongUnmask(55, 58);
_promotedPieceShift = 51;
_promotedPieceMask = Bitwise.CreateULongMask(51, 54);
_promotedPieceUnmask = Bitwise.CreateULongUnmask(51, 54);
_killerShift = 49;
_killerMask = Bitwise.CreateULongMask(49, 50);
_killerUnmask = Bitwise.CreateULongUnmask(49, 50);
_historyShift = 22;
_historyMask = Bitwise.CreateULongMask(22, 48);
_historyUnmask = Bitwise.CreateULongUnmask(22, 48);
_playedShift = 21;
_playedMask = Bitwise.CreateULongMask(21);
_playedUnmask = Bitwise.CreateULongUnmask(21);
_castlingShift = 20;
_castlingMask = Bitwise.CreateULongMask(20);
_castlingUnmask = Bitwise.CreateULongUnmask(20);
_kingMoveShift = 19;
_kingMoveMask = Bitwise.CreateULongMask(19);
_kingMoveUnmask = Bitwise.CreateULongUnmask(19);
_enPassantShift = 18;
_enPassantMask = Bitwise.CreateULongMask(18);
_enPassantUnmask = Bitwise.CreateULongUnmask(18);
_doublePawnMoveShift = 17;
_doublePawnMoveMask = Bitwise.CreateULongMask(17);
_doublePawnMoveUnmask = Bitwise.CreateULongUnmask(17);
_pawnMoveShift = 16;
_pawnMoveMask = Bitwise.CreateULongMask(16);
_pawnMoveUnmask = Bitwise.CreateULongUnmask(16);
_checkShift = 15;
_checkMask = Bitwise.CreateULongMask(15);
_checkUnmask = Bitwise.CreateULongUnmask(15);
_quietShift = 14;
_quietMask = Bitwise.CreateULongMask(14);
_quietUnmask = Bitwise.CreateULongUnmask(14);
_fromShift = 7;
_fromMask = Bitwise.CreateULongMask(7, 13);
_fromUnmask = Bitwise.CreateULongUnmask(7, 13);
_toMask = Bitwise.CreateULongMask(0, 6);
_toUnmask = Bitwise.CreateULongUnmask(0, 6);
// Set null move.
Null = 0;
SetIsBest(ref Null, false);
SetCaptureVictim(ref Null, Piece.None);
SetCaptureAttacker(ref Null, Piece.None);
SetPromotedPiece(ref Null, Piece.None);
SetKiller(ref Null, 0);
SetHistory(ref Null, 0);
SetPlayed(ref Null, false);
SetIsCastling(ref Null, false);
SetIsKingMove(ref Null, false);
SetIsEnPassantCapture(ref Null, false);
SetIsDoublePawnMove(ref Null, false);
SetIsPawnMove(ref Null, false);
SetIsCheck(ref Null, false);
SetIsQuiet(ref Null, false);
SetFrom(ref Null, Square.Illegal);
SetTo(ref Null, Square.Illegal);
}