rustengine 1.0.42

Rust bitboard multi variant uci chess analysis engine.
Documentation

MagicInfo{ sq: SQUARE_A1, magic: 0x0EEEE053F756C577, shift: 7 },
MagicInfo{ sq: SQUARE_B1, magic: 0x20A1752D5294E8AA, shift: 6 },
MagicInfo{ sq: SQUARE_C1, magic: 0xFFAE7DCBB67E2AD8, shift: 6 },
MagicInfo{ sq: SQUARE_D1, magic: 0x95E20936ACF52029, shift: 6 },
MagicInfo{ sq: SQUARE_E1, magic: 0x8659660ABA92446A, shift: 6 },
MagicInfo{ sq: SQUARE_F1, magic: 0xCB2205A8F212E3CD, shift: 6 },
MagicInfo{ sq: SQUARE_G1, magic: 0x63095C5766AEAC33, shift: 6 },
MagicInfo{ sq: SQUARE_H1, magic: 0x6A0A2CDED7FD32B6, shift: 7 },
MagicInfo{ sq: SQUARE_A2, magic: 0xF7AA6799A42C1974, shift: 6 },
MagicInfo{ sq: SQUARE_B2, magic: 0x0EEBFAAE2308CDE6, shift: 6 },
MagicInfo{ sq: SQUARE_C2, magic: 0x62F5D4C232917A29, shift: 6 },
MagicInfo{ sq: SQUARE_D2, magic: 0x6511DA45FB6E605B, shift: 6 },
MagicInfo{ sq: SQUARE_E2, magic: 0x1C1020709501F819, shift: 6 },
MagicInfo{ sq: SQUARE_F2, magic: 0x9713D67F067E5B55, shift: 6 },
MagicInfo{ sq: SQUARE_G2, magic: 0x4A9B28CAC8388396, shift: 6 },
MagicInfo{ sq: SQUARE_H2, magic: 0x0D80340307A89DE3, shift: 6 },
MagicInfo{ sq: SQUARE_A3, magic: 0xDFE4E245340681A7, shift: 6 },
MagicInfo{ sq: SQUARE_B3, magic: 0x086E282C294CE76A, shift: 6 },
MagicInfo{ sq: SQUARE_C3, magic: 0x7940D0C20066331C, shift: 8 },
MagicInfo{ sq: SQUARE_D3, magic: 0xB268CBA3523295A2, shift: 8 },
MagicInfo{ sq: SQUARE_E3, magic: 0xFA6472E0AEE3A9CD, shift: 8 },
MagicInfo{ sq: SQUARE_F3, magic: 0x4AB90CCE21C05AC4, shift: 8 },
MagicInfo{ sq: SQUARE_G3, magic: 0x19BBE314DB87C5A2, shift: 6 },
MagicInfo{ sq: SQUARE_H3, magic: 0x2D8420D15430341A, shift: 5 },
MagicInfo{ sq: SQUARE_A4, magic: 0x002064D946035D06, shift: 6 },
MagicInfo{ sq: SQUARE_B4, magic: 0x8F7EFC3826FCBC9E, shift: 6 },
MagicInfo{ sq: SQUARE_C4, magic: 0xA5EFF6F3B79E13AC, shift: 9 },
MagicInfo{ sq: SQUARE_D4, magic: 0x979736BB1A2BBF3F, shift: 12 },
MagicInfo{ sq: SQUARE_E4, magic: 0x47EF601CFFC5AA96, shift: 11 },
MagicInfo{ sq: SQUARE_F4, magic: 0xCBB12ECFB3AB9886, shift: 9 },
MagicInfo{ sq: SQUARE_G4, magic: 0x9F3DE5985071281C, shift: 6 },
MagicInfo{ sq: SQUARE_H4, magic: 0xF7F070016C4BB3B1, shift: 6 },
MagicInfo{ sq: SQUARE_A5, magic: 0x5B257CF070A81662, shift: 6 },
MagicInfo{ sq: SQUARE_B5, magic: 0xDDDDF92F252AC221, shift: 6 },
MagicInfo{ sq: SQUARE_C5, magic: 0x03B272448E17640F, shift: 8 },
MagicInfo{ sq: SQUARE_D5, magic: 0x344929A251A4A2B4, shift: 11 },
MagicInfo{ sq: SQUARE_E5, magic: 0xC59870B586EE336E, shift: 12 },
MagicInfo{ sq: SQUARE_F5, magic: 0x0D10F3CD6C346800, shift: 8 },
MagicInfo{ sq: SQUARE_G5, magic: 0x6C4A636CFAEE0FC3, shift: 6 },
MagicInfo{ sq: SQUARE_H5, magic: 0x1B7C2059AA3C501E, shift: 5 },
MagicInfo{ sq: SQUARE_A6, magic: 0xF44FA78502E05C46, shift: 6 },
MagicInfo{ sq: SQUARE_B6, magic: 0xA605295DB4D8A494, shift: 6 },
MagicInfo{ sq: SQUARE_C6, magic: 0x57293F7EEA9072FC, shift: 8 },
MagicInfo{ sq: SQUARE_D6, magic: 0x7A4B502FE080693E, shift: 8 },
MagicInfo{ sq: SQUARE_E6, magic: 0x840FE3E0F7C37EFD, shift: 8 },
MagicInfo{ sq: SQUARE_F6, magic: 0xC6553AE93DE5DEEB, shift: 8 },
MagicInfo{ sq: SQUARE_G6, magic: 0x186E0A1720748471, shift: 5 },
MagicInfo{ sq: SQUARE_H6, magic: 0x344586BD3800F615, shift: 6 },
MagicInfo{ sq: SQUARE_A7, magic: 0xDA81874F48DE2873, shift: 6 },
MagicInfo{ sq: SQUARE_B7, magic: 0xE750DB951630E01C, shift: 6 },
MagicInfo{ sq: SQUARE_C7, magic: 0x8D7AC01104BE4239, shift: 5 },
MagicInfo{ sq: SQUARE_D7, magic: 0xD069455082F020EF, shift: 6 },
MagicInfo{ sq: SQUARE_E7, magic: 0x0B12D09BE0A80D3B, shift: 5 },
MagicInfo{ sq: SQUARE_F7, magic: 0xF66D45FADE4750BF, shift: 6 },
MagicInfo{ sq: SQUARE_G7, magic: 0xDEE2FEF5608BB86B, shift: 6 },
MagicInfo{ sq: SQUARE_H7, magic: 0x3BC4110C30BC372E, shift: 5 },
MagicInfo{ sq: SQUARE_A8, magic: 0x030D2624DC9C2FAB, shift: 7 },
MagicInfo{ sq: SQUARE_B8, magic: 0x3BA0C0EE6C2C0185, shift: 5 },
MagicInfo{ sq: SQUARE_C8, magic: 0x0B7687D6A30FCDB0, shift: 6 },
MagicInfo{ sq: SQUARE_D8, magic: 0x1A17F24EB26AC5B9, shift: 6 },
MagicInfo{ sq: SQUARE_E8, magic: 0x70266A5B055D77F6, shift: 6 },
MagicInfo{ sq: SQUARE_F8, magic: 0x8498203F0163A952, shift: 6 },
MagicInfo{ sq: SQUARE_G8, magic: 0xC4E6130B3DBE1E26, shift: 6 },
MagicInfo{ sq: SQUARE_H8, magic: 0x9CB76E818B87114C, shift: 7 },

MagicInfo{ sq: SQUARE_A1, magic: 0xEB5BFB1511B7C572, shift: 14 },
MagicInfo{ sq: SQUARE_B1, magic: 0xC8608D0688E7A11A, shift: 13 },
MagicInfo{ sq: SQUARE_C1, magic: 0x3CE72520084C5AD7, shift: 13 },
MagicInfo{ sq: SQUARE_D1, magic: 0xB1CD151D5279C4E2, shift: 13 },
MagicInfo{ sq: SQUARE_E1, magic: 0x145254517D0A38C5, shift: 13 },
MagicInfo{ sq: SQUARE_F1, magic: 0x890F78296C5C6B67, shift: 14 },
MagicInfo{ sq: SQUARE_G1, magic: 0x535154D37FDA3758, shift: 13 },
MagicInfo{ sq: SQUARE_H1, magic: 0x6F10FA4A53DDDD67, shift: 14 },
MagicInfo{ sq: SQUARE_A2, magic: 0xFCF4667B997AD49A, shift: 13 },
MagicInfo{ sq: SQUARE_B2, magic: 0xB381EE06B8D760C9, shift: 12 },
MagicInfo{ sq: SQUARE_C2, magic: 0xF49744D7EA7A7F45, shift: 12 },
MagicInfo{ sq: SQUARE_D2, magic: 0x2FDDB993EF98801C, shift: 12 },
MagicInfo{ sq: SQUARE_E2, magic: 0x52893ECADF61693E, shift: 12 },
MagicInfo{ sq: SQUARE_F2, magic: 0x0CACE9126E294884, shift: 12 },
MagicInfo{ sq: SQUARE_G2, magic: 0x780E224E32B8259B, shift: 12 },
MagicInfo{ sq: SQUARE_H2, magic: 0x4ED7F0F359C79D1D, shift: 13 },
MagicInfo{ sq: SQUARE_A3, magic: 0x58FF574A6B17102C, shift: 13 },
MagicInfo{ sq: SQUARE_B3, magic: 0xC18E42DF30B60108, shift: 12 },
MagicInfo{ sq: SQUARE_C3, magic: 0x82615CC2DC1619E7, shift: 12 },
MagicInfo{ sq: SQUARE_D3, magic: 0x0AA0CFFF3CAB034F, shift: 12 },
MagicInfo{ sq: SQUARE_E3, magic: 0x3AA209B910A2A2C0, shift: 12 },
MagicInfo{ sq: SQUARE_F3, magic: 0x7D6D42D864ED4744, shift: 12 },
MagicInfo{ sq: SQUARE_G3, magic: 0x1F49AC2C1FDA6D5B, shift: 12 },
MagicInfo{ sq: SQUARE_H3, magic: 0x3B6D1A3A4AF92D50, shift: 13 },
MagicInfo{ sq: SQUARE_A4, magic: 0xE7C3B1D0B8EDF3A8, shift: 13 },
MagicInfo{ sq: SQUARE_B4, magic: 0xE01E4C628A791328, shift: 12 },
MagicInfo{ sq: SQUARE_C4, magic: 0xD9918490A8516264, shift: 12 },
MagicInfo{ sq: SQUARE_D4, magic: 0x4AFFDBD9881440CE, shift: 13 },
MagicInfo{ sq: SQUARE_E4, magic: 0x29D9E1F13D9B48A5, shift: 12 },
MagicInfo{ sq: SQUARE_F4, magic: 0xD2647A2309B70AF5, shift: 12 },
MagicInfo{ sq: SQUARE_G4, magic: 0xF9978681E00B17E0, shift: 12 },
MagicInfo{ sq: SQUARE_H4, magic: 0xF1F3DDFDAF83D405, shift: 13 },
MagicInfo{ sq: SQUARE_A5, magic: 0x954BA31977E062BA, shift: 13 },
MagicInfo{ sq: SQUARE_B5, magic: 0xD52B1274D43F1A9C, shift: 12 },
MagicInfo{ sq: SQUARE_C5, magic: 0xBE43F8A40D902543, shift: 12 },
MagicInfo{ sq: SQUARE_D5, magic: 0x8866A7F07B184CA5, shift: 12 },
MagicInfo{ sq: SQUARE_E5, magic: 0xF219EF680D77619C, shift: 12 },
MagicInfo{ sq: SQUARE_F5, magic: 0x9BB75C3B8476F746, shift: 12 },
MagicInfo{ sq: SQUARE_G5, magic: 0xAD1EE18B5B780265, shift: 12 },
MagicInfo{ sq: SQUARE_H5, magic: 0xB6B44224206E74E5, shift: 13 },
MagicInfo{ sq: SQUARE_A6, magic: 0x649CDC1F34AEA2F6, shift: 13 },
MagicInfo{ sq: SQUARE_B6, magic: 0xFF83A9859BA534C4, shift: 12 },
MagicInfo{ sq: SQUARE_C6, magic: 0x37CA319A4D50C97E, shift: 12 },
MagicInfo{ sq: SQUARE_D6, magic: 0x858715E0CC1F8F7A, shift: 12 },
MagicInfo{ sq: SQUARE_E6, magic: 0xE729AA5F024DF2C0, shift: 12 },
MagicInfo{ sq: SQUARE_F6, magic: 0x1274960D5333E983, shift: 12 },
MagicInfo{ sq: SQUARE_G6, magic: 0x4E78A790882C2806, shift: 12 },
MagicInfo{ sq: SQUARE_H6, magic: 0x7C27B241F8825A5B, shift: 13 },
MagicInfo{ sq: SQUARE_A7, magic: 0x0DFC0F9386834FD8, shift: 12 },
MagicInfo{ sq: SQUARE_B7, magic: 0x87342325FE073668, shift: 12 },
MagicInfo{ sq: SQUARE_C7, magic: 0x850AE96248D88210, shift: 12 },
MagicInfo{ sq: SQUARE_D7, magic: 0x8A8D8EA6E640F8F7, shift: 12 },
MagicInfo{ sq: SQUARE_E7, magic: 0xC6AC009AB7852C97, shift: 12 },
MagicInfo{ sq: SQUARE_F7, magic: 0x6D9B84E49D05E5D8, shift: 12 },
MagicInfo{ sq: SQUARE_G7, magic: 0xF598D5B0F5881D70, shift: 11 },
MagicInfo{ sq: SQUARE_H7, magic: 0x1238BF08A6F9C38D, shift: 12 },
MagicInfo{ sq: SQUARE_A8, magic: 0xCFC8C410148D3AF6, shift: 13 },
MagicInfo{ sq: SQUARE_B8, magic: 0x234F1593282FADBC, shift: 12 },
MagicInfo{ sq: SQUARE_C8, magic: 0x6BCC4CA147847096, shift: 13 },
MagicInfo{ sq: SQUARE_D8, magic: 0xA7FF3C5F35FFF73A, shift: 13 },
MagicInfo{ sq: SQUARE_E8, magic: 0x6A4F4F1EC85934C6, shift: 13 },
MagicInfo{ sq: SQUARE_F8, magic: 0x7E23DAD717AC6081, shift: 13 },
MagicInfo{ sq: SQUARE_G8, magic: 0x7211D918B0800852, shift: 12 },
MagicInfo{ sq: SQUARE_H8, magic: 0x8588AC87AA8CA46A, shift: 13 },

pub const FIGURE_FEN_SYMBOLS : [&str; 18] = [".","p","n","b","r","q","k","l","ln","lne","le","lse","ls","lsw","lw","lnw","s","j"];
pub const FIGURE_SAN_LETTERS : [&str; 18] = [".","P","N","B","R","Q","K","L","L","L","L","L","L","L","L","L","S","J"];
pub const PIECE_FEN_SYMBOLS : [&str; 36] = [".",".","p","P","n","N","b","B","r","R","q","Q","k","K","l","L","ln","Ln","lne","Lne","le","Le","lse","Lse","ls","Ls","lsw","Lsw","lw","Lw","lnw","Lnw","s","S","j","J"];

/// NO_FIGURE represents chess figure 'no_figure'
pub const NO_FIGURE : Figure = 0;
/// PAWN represents chess figure 'pawn'
pub const PAWN : Figure = 1;
/// KNIGHT represents chess figure 'knight'
pub const KNIGHT : Figure = 2;
/// BISHOP represents chess figure 'bishop'
pub const BISHOP : Figure = 3;
/// ROOK represents chess figure 'rook'
pub const ROOK : Figure = 4;
/// QUEEN represents chess figure 'queen'
pub const QUEEN : Figure = 5;
/// KING represents chess figure 'king'
pub const KING : Figure = 6;
/// LANCER represents chess figure 'lancer'
pub const LANCER : Figure = 7;
/// LANCERN represents chess figure 'lancern'
pub const LANCERN : Figure = 8;
/// LANCERNE represents chess figure 'lancerne'
pub const LANCERNE : Figure = 9;
/// LANCERE represents chess figure 'lancere'
pub const LANCERE : Figure = 10;
/// LANCERSE represents chess figure 'lancerse'
pub const LANCERSE : Figure = 11;
/// LANCERS represents chess figure 'lancers'
pub const LANCERS : Figure = 12;
/// LANCERSW represents chess figure 'lancersw'
pub const LANCERSW : Figure = 13;
/// LANCERW represents chess figure 'lancerw'
pub const LANCERW : Figure = 14;
/// LANCERNW represents chess figure 'lancernw'
pub const LANCERNW : Figure = 15;
/// SENTRY represents chess figure 'sentry'
pub const SENTRY : Figure = 16;
/// JAILER represents chess figure 'jailer'
pub const JAILER : Figure = 17;

/// RANK_1 represents rank '1' of a chess board
pub const RANK_1 : Rank = 0;
/// RANK_2 represents rank '2' of a chess board
pub const RANK_2 : Rank = 1;
/// RANK_3 represents rank '3' of a chess board
pub const RANK_3 : Rank = 2;
/// RANK_4 represents rank '4' of a chess board
pub const RANK_4 : Rank = 3;
/// RANK_5 represents rank '5' of a chess board
pub const RANK_5 : Rank = 4;
/// RANK_6 represents rank '6' of a chess board
pub const RANK_6 : Rank = 5;
/// RANK_7 represents rank '7' of a chess board
pub const RANK_7 : Rank = 6;
/// RANK_8 represents rank '8' of a chess board
pub const RANK_8 : Rank = 7;

/// FILE_A represents file 'a' of a chess board
pub const FILE_A : File = 0;
/// FILE_B represents file 'b' of a chess board
pub const FILE_B : File = 1;
/// FILE_C represents file 'c' of a chess board
pub const FILE_C : File = 2;
/// FILE_D represents file 'd' of a chess board
pub const FILE_D : File = 3;
/// FILE_E represents file 'e' of a chess board
pub const FILE_E : File = 4;
/// FILE_F represents file 'f' of a chess board
pub const FILE_F : File = 5;
/// FILE_G represents file 'g' of a chess board
pub const FILE_G : File = 6;
/// FILE_H represents file 'h' of a chess board
pub const FILE_H : File = 7;

/// SQUARE_A1 represents square 'a1' of a chess board
pub const SQUARE_A1: Square = 0;
/// SQUARE_B1 represents square 'b1' of a chess board
pub const SQUARE_B1: Square = 1;
/// SQUARE_C1 represents square 'c1' of a chess board
pub const SQUARE_C1: Square = 2;
/// SQUARE_D1 represents square 'd1' of a chess board
pub const SQUARE_D1: Square = 3;
/// SQUARE_E1 represents square 'e1' of a chess board
pub const SQUARE_E1: Square = 4;
/// SQUARE_F1 represents square 'f1' of a chess board
pub const SQUARE_F1: Square = 5;
/// SQUARE_G1 represents square 'g1' of a chess board
pub const SQUARE_G1: Square = 6;
/// SQUARE_H1 represents square 'h1' of a chess board
pub const SQUARE_H1: Square = 7;
/// SQUARE_A2 represents square 'a2' of a chess board
pub const SQUARE_A2: Square = 8;
/// SQUARE_B2 represents square 'b2' of a chess board
pub const SQUARE_B2: Square = 9;
/// SQUARE_C2 represents square 'c2' of a chess board
pub const SQUARE_C2: Square = 10;
/// SQUARE_D2 represents square 'd2' of a chess board
pub const SQUARE_D2: Square = 11;
/// SQUARE_E2 represents square 'e2' of a chess board
pub const SQUARE_E2: Square = 12;
/// SQUARE_F2 represents square 'f2' of a chess board
pub const SQUARE_F2: Square = 13;
/// SQUARE_G2 represents square 'g2' of a chess board
pub const SQUARE_G2: Square = 14;
/// SQUARE_H2 represents square 'h2' of a chess board
pub const SQUARE_H2: Square = 15;
/// SQUARE_A3 represents square 'a3' of a chess board
pub const SQUARE_A3: Square = 16;
/// SQUARE_B3 represents square 'b3' of a chess board
pub const SQUARE_B3: Square = 17;
/// SQUARE_C3 represents square 'c3' of a chess board
pub const SQUARE_C3: Square = 18;
/// SQUARE_D3 represents square 'd3' of a chess board
pub const SQUARE_D3: Square = 19;
/// SQUARE_E3 represents square 'e3' of a chess board
pub const SQUARE_E3: Square = 20;
/// SQUARE_F3 represents square 'f3' of a chess board
pub const SQUARE_F3: Square = 21;
/// SQUARE_G3 represents square 'g3' of a chess board
pub const SQUARE_G3: Square = 22;
/// SQUARE_H3 represents square 'h3' of a chess board
pub const SQUARE_H3: Square = 23;
/// SQUARE_A4 represents square 'a4' of a chess board
pub const SQUARE_A4: Square = 24;
/// SQUARE_B4 represents square 'b4' of a chess board
pub const SQUARE_B4: Square = 25;
/// SQUARE_C4 represents square 'c4' of a chess board
pub const SQUARE_C4: Square = 26;
/// SQUARE_D4 represents square 'd4' of a chess board
pub const SQUARE_D4: Square = 27;
/// SQUARE_E4 represents square 'e4' of a chess board
pub const SQUARE_E4: Square = 28;
/// SQUARE_F4 represents square 'f4' of a chess board
pub const SQUARE_F4: Square = 29;
/// SQUARE_G4 represents square 'g4' of a chess board
pub const SQUARE_G4: Square = 30;
/// SQUARE_H4 represents square 'h4' of a chess board
pub const SQUARE_H4: Square = 31;
/// SQUARE_A5 represents square 'a5' of a chess board
pub const SQUARE_A5: Square = 32;
/// SQUARE_B5 represents square 'b5' of a chess board
pub const SQUARE_B5: Square = 33;
/// SQUARE_C5 represents square 'c5' of a chess board
pub const SQUARE_C5: Square = 34;
/// SQUARE_D5 represents square 'd5' of a chess board
pub const SQUARE_D5: Square = 35;
/// SQUARE_E5 represents square 'e5' of a chess board
pub const SQUARE_E5: Square = 36;
/// SQUARE_F5 represents square 'f5' of a chess board
pub const SQUARE_F5: Square = 37;
/// SQUARE_G5 represents square 'g5' of a chess board
pub const SQUARE_G5: Square = 38;
/// SQUARE_H5 represents square 'h5' of a chess board
pub const SQUARE_H5: Square = 39;
/// SQUARE_A6 represents square 'a6' of a chess board
pub const SQUARE_A6: Square = 40;
/// SQUARE_B6 represents square 'b6' of a chess board
pub const SQUARE_B6: Square = 41;
/// SQUARE_C6 represents square 'c6' of a chess board
pub const SQUARE_C6: Square = 42;
/// SQUARE_D6 represents square 'd6' of a chess board
pub const SQUARE_D6: Square = 43;
/// SQUARE_E6 represents square 'e6' of a chess board
pub const SQUARE_E6: Square = 44;
/// SQUARE_F6 represents square 'f6' of a chess board
pub const SQUARE_F6: Square = 45;
/// SQUARE_G6 represents square 'g6' of a chess board
pub const SQUARE_G6: Square = 46;
/// SQUARE_H6 represents square 'h6' of a chess board
pub const SQUARE_H6: Square = 47;
/// SQUARE_A7 represents square 'a7' of a chess board
pub const SQUARE_A7: Square = 48;
/// SQUARE_B7 represents square 'b7' of a chess board
pub const SQUARE_B7: Square = 49;
/// SQUARE_C7 represents square 'c7' of a chess board
pub const SQUARE_C7: Square = 50;
/// SQUARE_D7 represents square 'd7' of a chess board
pub const SQUARE_D7: Square = 51;
/// SQUARE_E7 represents square 'e7' of a chess board
pub const SQUARE_E7: Square = 52;
/// SQUARE_F7 represents square 'f7' of a chess board
pub const SQUARE_F7: Square = 53;
/// SQUARE_G7 represents square 'g7' of a chess board
pub const SQUARE_G7: Square = 54;
/// SQUARE_H7 represents square 'h7' of a chess board
pub const SQUARE_H7: Square = 55;
/// SQUARE_A8 represents square 'a8' of a chess board
pub const SQUARE_A8: Square = 56;
/// SQUARE_B8 represents square 'b8' of a chess board
pub const SQUARE_B8: Square = 57;
/// SQUARE_C8 represents square 'c8' of a chess board
pub const SQUARE_C8: Square = 58;
/// SQUARE_D8 represents square 'd8' of a chess board
pub const SQUARE_D8: Square = 59;
/// SQUARE_E8 represents square 'e8' of a chess board
pub const SQUARE_E8: Square = 60;
/// SQUARE_F8 represents square 'f8' of a chess board
pub const SQUARE_F8: Square = 61;
/// SQUARE_G8 represents square 'g8' of a chess board
pub const SQUARE_G8: Square = 62;
/// SQUARE_H8 represents square 'h8' of a chess board
pub const SQUARE_H8: Square = 63;