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board.cpp
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#include "board.h"
#include "utils.h"
#include "console.h"
#include "movedatabase.h"
#include "movegenerator.h"
#include "piece.h"
#include "fenstring.h"
#include "transpositiontable.h"
#include "evaluation.h"
#include <iostream>
#include <cstring>
#include <cmath>
#include "piecesquaretables.h"
#define ASSERT(b) if(!b) {std::cout << "Position not ok!\n"; Display(); abort();}
namespace Napoleon
{
Board::Board()
{
MoveDatabase::InitAttacks();
Zobrist::Init();
pieces[PieceColor::White] = Constants::Empty;
pieces[PieceColor::Black] = Constants::Empty;
OccupiedSquares = Constants::Empty;
EmptySquares = Constants::Empty;
FirstMoveCutoff = 0;
TotalCutoffs = 0;
for (Color c = PieceColor::White; c < PieceColor::None; c++)
for (File f = 0; f < 8; f++)
pawnsOnFile[c][f] = 0;
}
void Board::LoadGame(std::string pos)
{
FenString fenString(pos);
for (Color c = PieceColor::White; c < PieceColor::None; c++)
for (Type t = PieceType::Pawn; t < PieceType::None; t++)
numOfPieces[c][t] = 0;
for (Color c = PieceColor::White; c < PieceColor::None; c++)
for (File f = 0; f < 8; f++)
pawnsOnFile[c][f] = 0;
material[PieceColor::White] = 0;
material[PieceColor::Black] = 0;
allowNullMove = true;
currentPly = 0;
zobrist = 0;
pawnKey = 0;
initializeCastlingStatus(fenString);
initializesideToMove(fenString);
initializePieceSet(fenString);
initializeEnPassantSquare(fenString);
initializeBitBoards(fenString);
pstValue[PieceColor::White] = calculatePST(PieceColor::White);
pstValue[PieceColor::Black] = calculatePST(PieceColor::Black);
ASSERT(this->PosIsOk());
}
Score Board::calculatePST(Color color) const
{
using namespace Constants::Squares;
Piece piece;
int pst[2][2] = {{0}};
for (Napoleon::Square sq = IntA1; sq <= IntH8; sq++)
{
piece = PieceOnSquare(sq);
if (piece.Type != PieceType::None)
{
Score scores = Evaluation::PieceSquareValue(piece, sq);
pst[piece.Color][0] += scores.first;
pst[piece.Color][1] += scores.second;
}
}
return std::make_pair(pst[color][0], pst[color][1]);
}
void Board::AddPiece(Piece piece, Square sq)
{
pieceSet[sq] = piece;
if (piece.Type != PieceType::None)
{
numOfPieces[piece.Color][piece.Type]++;
material[piece.Color] += Constants::Piece::PieceValue[piece.Type];
zobrist ^= Zobrist::Piece[piece.Color][piece.Type][sq];
if (piece.Type == PieceType::Pawn)
{
pawnsOnFile[piece.Color][Utils::Square::GetFileIndex(sq)]++;
pawnKey ^= Zobrist::Piece[piece.Color][PieceType::Pawn][sq];
}
//if (piece.Type == PieceType::King)
//pawnKey ^= Zobrist::Piece[piece.Color][PieceType::King][sq];
}
}
void Board::clearPieceSet()
{
for (Square i = 0; i < 64; i++)
{
pieceSet[i] = Constants::Piece::Null;
}
}
void Board::updateGenericBitBoards()
{
pieces[PieceColor::White] =
bitBoardSet[PieceColor::White][PieceType::Pawn] | bitBoardSet[PieceColor::White][PieceType::Knight]
| bitBoardSet[PieceColor::White][PieceType::Bishop] | bitBoardSet[PieceColor::White][PieceType::Rook]
| bitBoardSet[PieceColor::White][PieceType::Queen] | bitBoardSet[PieceColor::White][PieceType::King];
pieces[PieceColor::Black] =
bitBoardSet[PieceColor::Black][PieceType::Pawn] | bitBoardSet[PieceColor::Black][PieceType::Knight]
| bitBoardSet[PieceColor::Black][PieceType::Bishop] | bitBoardSet[PieceColor::Black][PieceType::Rook]
| bitBoardSet[PieceColor::Black][PieceType::Queen] | bitBoardSet[PieceColor::Black][PieceType::King];
OccupiedSquares = pieces[PieceColor::White] | pieces[PieceColor::Black];
EmptySquares = ~OccupiedSquares;
}
std::string Board::ToCsv() const
{
std::string csv;
for (auto c = PieceColor::White; c < PieceColor::None; c++) {
for (Type p = PieceType::Pawn; p < PieceType::None; p++) {
csv += Utils::BitBoard::ToString(Pieces(c, p)) += ",";
}
}
csv += std::to_string(sideToMove) + ",";
csv += std::to_string(enPassantSquare) + ",";
csv += std::to_string(castlingStatus);
return csv;
}
void Board::Display() const
{
Piece piece;
for (int r = 7; r >= 0; r--)
{
std::cout << " ------------------------\n";
std::cout << " " << r + 1 << " ";
for (int c = 0; c <= 7; c++)
{
piece = pieceSet[Utils::Square::GetSquareIndex(c, r)];
std::cout << '[';
if (piece.Type != PieceType::None)
{
std::cout << (piece.Color == PieceColor::White ? Console::Green : Console::Red);
std::cout << Utils::Piece::GetInitial(pieceSet[Utils::Square::GetSquareIndex(c, r)].Type);
}
else
{
std::cout << Console::Red;
std::cout << ' ';
}
std::cout << Console::Reset;
std::cout << ']';
}
std::cout << std::endl;
}
std::cout << "\n A B C D E F G H" << std::endl;
std::cout << "FEN: " << GetFen() << std::endl;
std::cout << "Enpassant Square: " << Utils::Square::ToAlgebraic(enPassantSquare) << std::endl;
std::cout << "Side To Move: " << (sideToMove == PieceColor::White ? "White" : "Black") << std::endl;
std::cout << "Castling Rights: ";
std::cout << (castlingStatus & Constants::Castle::WhiteCastleOO ? "K" : "");
std::cout << (castlingStatus & Constants::Castle::WhiteCastleOOO ? "Q" : "");
std::cout << (castlingStatus & Constants::Castle::BlackCastleOO ? "k" : "");
std::cout << (castlingStatus & Constants::Castle::BlackCastleOOO ? "q" : "") << std::endl;
std::cout << "HalfMove Clock: " << halfMoveClock << std::endl;
std::cout << "Ply: " << currentPly << std::endl;
std::cout << "Game Phase: " << Phase() << std::endl;
// std::cout << "pstValue[white]: " << pstValue[PieceColor::White] << "\t calculated: " << CalculatePST(PieceColor::White) << std::endl;
// std::cout << "pstValue[black]: " << pstValue[PieceColor::Black] << "\t calculated: " << CalculatePST(PieceColor::Black) << std::endl;
// std::cout << "GameStage: " << (Stage() == GameStage::EndGame ? "Endgame" : "Opening or MidGame") << std::endl;
//for (Color c = PieceColor::White; c < PieceColor::None; c++)
//{
// for (Type t = PieceType::Pawn; t < PieceType::None; t++)
// {
// if (numOfPieces[c][t] != Utils::BitBoard::PopCount(Pieces(c, t)))
// std::cout << int(t) << ": " << numOfPieces[c][t] << std::endl;
// }
//}
// using namespace Constants::Squares;
// Piece piece2;
// int pst[2] = {0};
// for (Napoleon::Square sq = IntA1; sq <= IntH8; sq++)
// {
// piece2 = PieceOnSquare(sq);
// if (piece2.Type != PieceType::None && piece2.Color == SideToMove())
// {
// std::cout << "sq: " << Utils::Square::ToAlgebraic(sq) << "\t score: " << Evaluation::PieceSquareValue(piece2, sq, *this) << std::endl;
// }
// }
}
void Board::initializeCastlingStatus(const FenString& fenString)
{
castlingStatus = 0;
if (fenString.CanWhiteShortCastle)
castlingStatus |= Constants::Castle::WhiteCastleOO;
if (fenString.CanWhiteLongCastle)
castlingStatus |= Constants::Castle::WhiteCastleOOO;
if (fenString.CanBlackShortCastle)
castlingStatus |= Constants::Castle::BlackCastleOO;
if (fenString.CanBlackLongCastle)
castlingStatus |= Constants::Castle::BlackCastleOOO;
zobrist ^= Zobrist::Castling[castlingStatus];
}
void Board::initializesideToMove(const FenString& fenString)
{
sideToMove = fenString.sideToMove;
if (sideToMove == PieceColor::Black)
zobrist ^= Zobrist::Color;
}
void Board::initializePieceSet(const FenString& fenString)
{
for (Square i = 0; i < 64; i++)
{
AddPiece(fenString.PiecePlacement[i], i);
}
}
void Board::initializeEnPassantSquare(const FenString& fenString)
{
enPassantSquare = fenString.EnPassantSquare;
if (enPassantSquare != Constants::Squares::Invalid)
{
zobrist ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
pawnKey ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
}
}
void Board::initializeHalfMoveClock(const FenString& fenString)
{
halfMoveClock = fenString.HalfMove;
}
void Board::initializeBitBoards(const FenString& fenString)
{
for (Type i = PieceType::Pawn; i < PieceType::None; i++)
for (Color l = PieceColor::White; l < PieceColor::None; l++)
bitBoardSet[l][i] = 0;
for (Square i = 0; i < 64; i++)
{
if (fenString.PiecePlacement[i].Type == PieceType::King)
kingSquare[fenString.PiecePlacement[i].Color] = i;
if (fenString.PiecePlacement[i].Color != PieceColor::None)
bitBoardSet[fenString.PiecePlacement[i].Color][fenString.PiecePlacement[i].Type] |= Constants::Masks::SquareMask[i];
}
updateGenericBitBoards();
}
Move Board::ParseMove(std::string str) const
{
Square from = Utils::Square::Parse(str.substr(0, 2));
Square to = Utils::Square::Parse(str.substr(2));
Move move;
if (to == enPassantSquare && pieceSet[from].Type == PieceType::Pawn)
move = Move(from, to, EnPassant);
else if (str == "e1g1")
move = Constants::Castle::WhiteCastlingOO;
else if (str == "e8g8")
move = Constants::Castle::BlackCastlingOO;
else if (str == "e1c1")
move = Constants::Castle::WhiteCastlingOOO;
else if (str == "e8c8")
move = Constants::Castle::BlackCastlingOOO;
else if (str.size() == 5)
move = Move(from, to, 0x8 | (Utils::Piece::GetPiece(str[4]) - 1));
else
move = Move(from, to);
return move;
}
void Board::MakeMove(Move move)
{
bool incrementClock = true;
Square from = move.FromSquare();
Square to = move.ToSquare();
Type promoted;
Type captured = move.IsEnPassant() ? static_cast<Type>(PieceType::Pawn) : pieceSet[to].Type;
Type pieceMoved = pieceSet[from].Type;
Color enemy = Utils::Piece::GetOpposite(sideToMove);
bool capture = captured != PieceType::None;
castlingStatusHistory[currentPly] = castlingStatus; // salva i diritti di arrocco correnti
enpSquaresHistory[currentPly] = enPassantSquare; // salva l'attuale casella enpassant
halfMoveClockHistory[currentPly] = halfMoveClock; // salva l'attuale contatore di semi-mosse
hashHistory[currentPly] = zobrist; // salva l'hash key per verificare se la posizione si e` ripetuta
capturedPieceHistory[currentPly] = captured; // salva il pezzo catturato
zobrist ^= Zobrist::Color; // aggiorna il colore della posizione
//ARRAY
pieceSet[to] = pieceSet[from]; // muove il pezzo
pieceSet[from] = Constants::Piece::Null; // svuota la casella di partenza
updatePstvalue<Sub>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, pieceMoved), from));
updatePstvalue<Add>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, pieceMoved), to));
//BITBOARDS
BitBoard From = Constants::Masks::SquareMask[from];
BitBoard To = Constants::Masks::SquareMask[to];
BitBoard FromTo = From | To;
// aggiorna la bitboard
bitBoardSet[sideToMove][pieceMoved] ^= FromTo;
zobrist ^= Zobrist::Piece[sideToMove][pieceMoved][from]; // aggiorna zobrist key (rimuove il pezzo mosso)
zobrist ^= Zobrist::Piece[sideToMove][pieceMoved][to]; // aggiorna zobrist key (sposta il pezzo mosso)
if (pieceMoved == PieceType::Pawn /*|| pieceMoved == PieceType::King*/)
{
pawnKey ^= Zobrist::Piece[sideToMove][pieceMoved][from];
pawnKey ^= Zobrist::Piece[sideToMove][pieceMoved][to];
}
// aggiorna i pezzi del giocatore
pieces[sideToMove] ^= FromTo;
// se ilpezzo mosso e` il re si aggiorna la sua casella
if (pieceMoved == PieceType::King)
{
kingSquare[sideToMove] = to;
if (move.IsCastle())
{
makeCastle(from, to);
}
if (sideToMove == PieceColor::White)
castlingStatus &= ~(Constants::Castle::WhiteCastleOO | Constants::Castle::WhiteCastleOOO); // azzera i diritti di arrocco per il bianco
else
castlingStatus &= ~(Constants::Castle::BlackCastleOO | Constants::Castle::BlackCastleOOO); // azzera i diritti di arrocco per il nero
}
else if (pieceMoved == PieceType::Rook) // se e` stata mossa una torre cambia i diritti di arrocco
{
if (castlingStatus) // se i giocatori possono ancora muovere
{
if (sideToMove == PieceColor::White)
{
if (from == Constants::Squares::IntA1)
castlingStatus &= ~Constants::Castle::WhiteCastleOOO;
else if (from == Constants::Squares::IntH1)
castlingStatus &= ~Constants::Castle::WhiteCastleOO;
}
else
{
if (from == Constants::Squares::IntA8)
castlingStatus &= ~Constants::Castle::BlackCastleOOO;
else if (from == Constants::Squares::IntH8)
castlingStatus &= ~Constants::Castle::BlackCastleOO;
}
}
}
else if (move.IsPromotion())
{
promoted = move.PiecePromoted();
pieceSet[to] = Piece(sideToMove, promoted);
bitBoardSet[sideToMove][PieceType::Pawn] ^= To;
bitBoardSet[sideToMove][promoted] ^= To;
numOfPieces[sideToMove][PieceType::Pawn]--;
numOfPieces[sideToMove][promoted]++;
material[sideToMove] -= Constants::Piece::PieceValue[PieceType::Pawn];
material[sideToMove] += Constants::Piece::PieceValue[promoted];
zobrist ^= Zobrist::Piece[sideToMove][PieceType::Pawn][to];
zobrist ^= Zobrist::Piece[sideToMove][promoted][to];
pawnKey ^= Zobrist::Piece[sideToMove][PieceType::Pawn][to];
updatePstvalue<Sub>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, PieceType::Pawn), to));
updatePstvalue<Add>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, promoted), to));
if (!capture)
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(from)]--;
else
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(to)]--;
}
if (capture)
{
if (move.IsEnPassant())
{
BitBoard piece;
if (sideToMove == PieceColor::White)
{
piece = Constants::Masks::SquareMask[enPassantSquare - 8];
pieceSet[enPassantSquare - 8] = Constants::Piece::Null;
updatePstvalue<Sub>(enemy, Evaluation::PieceSquareValue(Piece(enemy, PieceType::Pawn), enPassantSquare - 8));
zobrist ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare - 8]; // rimuove il pedone nero catturato en passant
pawnKey ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare - 8]; // rimuove il pedone nero catturato en passant
}
else
{
piece = Constants::Masks::SquareMask[enPassantSquare + 8];
pieceSet[enPassantSquare + 8] = Constants::Piece::Null;
updatePstvalue<Sub>(enemy, Evaluation::PieceSquareValue(Piece(enemy, PieceType::Pawn), enPassantSquare + 8));
zobrist ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare + 8]; // rimuove il pedone bianco catturato en passant
pawnKey ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare + 8]; // rimuove il pedone bianco catturato en passant
}
pieces[enemy] ^= piece;
bitBoardSet[enemy][PieceType::Pawn] ^= piece;
OccupiedSquares ^= FromTo ^ piece;
EmptySquares ^= FromTo ^ piece;
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(from)]--;
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(to)]++;
pawnsOnFile[enemy][Utils::Square::GetFileIndex(to)]--;
}
else
{
if (captured == PieceType::Rook)
{
if (enemy == PieceColor::White)
{
if (to == Constants::Squares::IntH1)
castlingStatus &= ~Constants::Castle::WhiteCastleOO;
else if (to == Constants::Squares::IntA1)
castlingStatus &= ~Constants::Castle::WhiteCastleOOO;
}
else
{
if (to == Constants::Squares::IntH8)
castlingStatus &= ~Constants::Castle::BlackCastleOO;
else if (to == Constants::Squares::IntA8)
castlingStatus &= ~Constants::Castle::BlackCastleOOO;
}
}
else if (captured == PieceType::Pawn)
{
pawnsOnFile[enemy][Utils::Square::GetFileIndex(to)]--;
pawnKey ^= Zobrist::Piece[enemy][PieceType::Pawn][to];
}
if (pieceMoved == PieceType::Pawn)
{
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(from)]--;
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(to)]++;
}
updatePstvalue<Sub>(enemy, Evaluation::PieceSquareValue(Piece(enemy, captured), to));
bitBoardSet[enemy][captured] ^= To;
pieces[enemy] ^= To; //aggiorna i pezzi dell'avversario
OccupiedSquares ^= From;
EmptySquares ^= From;
zobrist ^= Zobrist::Piece[enemy][captured][to]; // rimuove il pezzo catturato
}
numOfPieces[enemy][captured]--;
material[enemy] -= Constants::Piece::PieceValue[captured];
incrementClock = false; // non incrementare il contatore di semi-mosse perche` e` stato catturato un pezzo
}
else
{
OccupiedSquares ^= FromTo;
EmptySquares ^= FromTo;
}
if (enPassantSquare != Constants::Squares::Invalid)
{
zobrist ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
pawnKey ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
}
// azzera la casella enpassant
enPassantSquare = Constants::Squares::Invalid;
// se il pedone si muove di due caselle si aggiorna la casella enpassant
if (pieceMoved == PieceType::Pawn)
{
incrementClock = false; // non incrementare il contatore di semi-mosse perche` e` stato mosso un pedone
int sq = to - from; // calcola la distanza
if (sq == 16 || sq == -16) // doppio spostamento del pedone
{
enPassantSquare = to - sq / 2;
zobrist ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
pawnKey ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
}
}
if (castlingStatusHistory[currentPly] != castlingStatus)
zobrist ^= Zobrist::Castling[castlingStatus]; // cambia i diritti di arrocco
if (incrementClock) halfMoveClock++; // incrementa il contatore
else halfMoveClock = 0; // resetta il contatore
// cambia turno
sideToMove = enemy;
// aumenta profondita`
currentPly++;
ASSERT(PosIsOk());
}
void Board::UndoMove(Move move)
{
Square from = move.FromSquare();
Square to = move.ToSquare();
Color enemy = sideToMove;
bool promotion = move.IsPromotion();
bool capture;
Type promoted;
Type captured;
Type pieceMoved;
// decrementa profondita`
currentPly--;
captured = capturedPieceHistory[currentPly];
capture = captured != PieceType::None;
zobrist ^= Zobrist::Color; // aggiorna il colore della posizione
if (castlingStatusHistory[currentPly] != castlingStatus)
zobrist ^= Zobrist::Castling[castlingStatus]; // cambia i diritti di arrocco
if (enPassantSquare != Constants::Squares::Invalid)
{
zobrist ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
pawnKey ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enPassantSquare)];
}
if (enpSquaresHistory[currentPly] != Constants::Squares::Invalid)
{
zobrist ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enpSquaresHistory[currentPly])];
pawnKey ^= Zobrist::Enpassant[Utils::Square::GetFileIndex(enpSquaresHistory[currentPly])];
}
halfMoveClock = halfMoveClockHistory[currentPly];
// se la mossa e` stata una promozione il pezzo mosso e` un pedone
if (promotion)
pieceMoved = PieceType::Pawn;
else
pieceMoved = pieceSet[to].Type;
// reimposta il turno
sideToMove = Utils::Piece::GetOpposite(sideToMove);
// ARRAY
pieceSet[from] = pieceSet[to]; // muove il pezzo
if (!promotion)
{
updatePstvalue<Sub>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, pieceMoved), to));
updatePstvalue<Add>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, pieceMoved), from));
}
// BITBOARDS
BitBoard From = Constants::Masks::SquareMask[from];
BitBoard To = Constants::Masks::SquareMask[to];
BitBoard FromTo = From | To;
// aggiorna la bitboard
bitBoardSet[sideToMove][pieceMoved] ^= FromTo;
zobrist ^= Zobrist::Piece[sideToMove][pieceMoved][from]; // aggiorna zobrist key (rimuove il pezzo mosso)
zobrist ^= Zobrist::Piece[sideToMove][pieceMoved][to]; // aggiorna zobrist key (sposta il pezzo mosso)
if (pieceMoved == PieceType::Pawn /*|| pieceMoved == PieceType::King*/)
{
pawnKey ^= Zobrist::Piece[sideToMove][pieceMoved][from];
pawnKey ^= Zobrist::Piece[sideToMove][pieceMoved][to];
}
// aggiorna i pezzi del giocatore
pieces[sideToMove] ^= FromTo;
// se ilpezzo mosso e` il re si aggiorna la sua casella
if (pieceMoved == PieceType::King)
{
kingSquare[sideToMove] = from;
if (move.IsCastle())
{
undoCastle(from, to);
}
castlingStatus = castlingStatusHistory[currentPly]; // resetta i diritti di arrocco dello stato precedente
}
else if (pieceMoved == PieceType::Rook)
{
castlingStatus = castlingStatusHistory[currentPly];
}
else if (promotion)
{
promoted = move.PiecePromoted();
numOfPieces[sideToMove][PieceType::Pawn]++;
numOfPieces[sideToMove][promoted]--;
material[sideToMove] += Constants::Piece::PieceValue[PieceType::Pawn];
material[sideToMove] -= Constants::Piece::PieceValue[promoted];
pieceSet[from] = Piece(sideToMove, PieceType::Pawn);
bitBoardSet[sideToMove][promoted] ^= To;
bitBoardSet[sideToMove][PieceType::Pawn] ^= To;
zobrist ^= Zobrist::Piece[sideToMove][PieceType::Pawn][to];
zobrist ^= Zobrist::Piece[sideToMove][promoted][to];
pawnKey ^= Zobrist::Piece[sideToMove][PieceType::Pawn][to];
updatePstvalue<Add>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, PieceType::Pawn), from));
updatePstvalue<Sub>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, promoted), to));
if (!capture)
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(from)]++;
else
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(to)]++;
}
// reimposta la casella enpassant
enPassantSquare = enpSquaresHistory[currentPly];
if (capture)
{
if (move.IsEnPassant())
{
pieceSet[to] = Constants::Piece::Null; // svuota la casella di partenza perche` non c'erano pezzi prima
BitBoard piece;
if (sideToMove == PieceColor::White)
{
piece = Constants::Masks::SquareMask[enPassantSquare - 8];
pieceSet[enPassantSquare - 8] = Piece(PieceColor::Black, PieceType::Pawn);
updatePstvalue<Add>(enemy, Evaluation::PieceSquareValue(Piece(enemy, PieceType::Pawn), enPassantSquare - 8));
zobrist ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare - 8]; // rimuove il pedone nero catturato en passant
pawnKey ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare - 8]; // rimuove il pedone nero catturato en passant
}
else
{
piece = Constants::Masks::SquareMask[enPassantSquare + 8];
pieceSet[enPassantSquare + 8] = Piece(PieceColor::White, PieceType::Pawn);
updatePstvalue<Add>(enemy, Evaluation::PieceSquareValue(Piece(enemy, PieceType::Pawn), enPassantSquare + 8));
zobrist ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare + 8]; // rimuove il pedone nero catturato en passant
pawnKey ^= Zobrist::Piece[enemy][PieceType::Pawn][enPassantSquare + 8]; // rimuove il pedone nero catturato en passant
}
pieces[enemy] ^= piece;
bitBoardSet[enemy][PieceType::Pawn] ^= piece;
OccupiedSquares ^= FromTo ^ piece;
EmptySquares ^= FromTo ^ piece;
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(from)]++;
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(to)]--;
pawnsOnFile[enemy][Utils::Square::GetFileIndex(to)]++;
}
else
{
assert(captured != PieceType::None);
assert(captured == capturedPieceHistory[currentPly]);
if (captured == PieceType::Rook)
{
castlingStatus = castlingStatusHistory[currentPly];
}
else if (captured == PieceType::Pawn)
{
pawnsOnFile[enemy][Utils::Square::GetFileIndex(to)]++;
pawnKey ^= Zobrist::Piece[enemy][PieceType::Pawn][to];
}
if (pieceMoved == PieceType::Pawn)
{
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(from)]++;
pawnsOnFile[sideToMove][Utils::Square::GetFileIndex(to)]--;
}
updatePstvalue<Add>(enemy, Evaluation::PieceSquareValue(Piece(enemy, captured), to));
// reinserisce il pezzo catturato nella sua casella
pieceSet[to] = Piece(enemy, captured);
bitBoardSet[enemy][captured] ^= To;
pieces[enemy] ^= To; //aggiorna i pezzi dell'avversario
OccupiedSquares ^= From;
EmptySquares ^= From;
zobrist ^= Zobrist::Piece[enemy][captured][to]; // rimuove il pezzo catturato
}
numOfPieces[enemy][captured]++;
material[enemy] += Constants::Piece::PieceValue[captured];
}
else
{
// svuota la casella di partenza perche` non c'erano pezzi prima
pieceSet[to] = Constants::Piece::Null;
OccupiedSquares ^= FromTo;
EmptySquares ^= FromTo;
}
ASSERT(PosIsOk());
}
void Board::makeCastle(Square from, Square to)
{
BitBoard rook;
Square fromR;
Square toR;
if (from < to) // Castle O-O
{
if (sideToMove == PieceColor::White)
{
fromR = Constants::Squares::IntH1;
toR = Constants::Squares::IntF1;
}
else
{
fromR = Constants::Squares::IntH8;
toR = Constants::Squares::IntF8;
}
}
else // Castle O-O-O
{
if (sideToMove == PieceColor::White)
{
fromR = Constants::Squares::IntA1;
toR = Constants::Squares::IntD1;
}
else
{
fromR = Constants::Squares::IntA8;
toR = Constants::Squares::IntD8;
}
}
rook = Constants::Masks::SquareMask[fromR] | Constants::Masks::SquareMask[toR];
pieces[sideToMove] ^= rook;
bitBoardSet[sideToMove][PieceType::Rook] ^= rook;
OccupiedSquares ^= rook;
EmptySquares ^= rook;
pieceSet[fromR] = Constants::Piece::Null; // sposta la torre
pieceSet[toR] = Piece(sideToMove, PieceType::Rook); // sposta la torre
updatePstvalue<Sub>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, PieceType::Rook), fromR));
updatePstvalue<Add>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, PieceType::Rook), toR));
zobrist ^= Zobrist::Piece[sideToMove][PieceType::Rook][fromR];
zobrist ^= Zobrist::Piece[sideToMove][PieceType::Rook][toR];
castled[sideToMove] = true;
}
void Board::undoCastle(Square from, Square to)
{
BitBoard rook;
Square fromR;
Square toR;
if (from < to) // Castle O-O
{
if (sideToMove == PieceColor::White)
{
fromR = Constants::Squares::IntH1;
toR = Constants::Squares::IntF1;
}
else
{
fromR = Constants::Squares::IntH8;
toR = Constants::Squares::IntF8;
}
}
else // Castle O-O-O
{
if (sideToMove == PieceColor::White)
{
fromR = Constants::Squares::IntA1;
toR = Constants::Squares::IntD1;
}
else
{
fromR = Constants::Squares::IntA8;
toR = Constants::Squares::IntD8;
}
}
rook = Constants::Masks::SquareMask[fromR] | Constants::Masks::SquareMask[toR];
pieces[sideToMove] ^= rook;
bitBoardSet[sideToMove][PieceType::Rook] ^= rook;
OccupiedSquares ^= rook;
EmptySquares ^= rook;
pieceSet[fromR] = Piece(sideToMove, PieceType::Rook); // sposta la torre
pieceSet[toR] = Constants::Piece::Null; // sposta la torre
updatePstvalue<Add>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, PieceType::Rook), fromR));
updatePstvalue<Sub>(sideToMove, Evaluation::PieceSquareValue(Piece(sideToMove, PieceType::Rook), toR));
castlingStatus = castlingStatusHistory[currentPly]; // ripristina i diritti di arrocco dello stato precedente
zobrist ^= Zobrist::Piece[sideToMove][PieceType::Rook][fromR];
zobrist ^= Zobrist::Piece[sideToMove][PieceType::Rook][toR];
castled[sideToMove] = false;
}
bool Board::IsAttacked(BitBoard target, Color side) const
{
BitBoard slidingAttackers;
BitBoard pawnAttacks;
Byte enemyColor = Utils::Piece::GetOpposite(side);
Square to;
while (target != 0)
{
to = Utils::BitBoard::BitScanForwardReset(target);
pawnAttacks = MoveDatabase::PawnAttacks[side][to];
if ((Pieces(enemyColor, PieceType::Pawn) & pawnAttacks) != 0) return true;
if ((Pieces(enemyColor, PieceType::Knight) & MoveDatabase::KnightAttacks[to]) != 0) return true;
if ((Pieces(enemyColor, PieceType::King) & MoveDatabase::KingAttacks[to]) != 0) return true;
// file / rank attacks
slidingAttackers = Pieces(enemyColor, PieceType::Queen) | Pieces(enemyColor, PieceType::Rook);
if (slidingAttackers != 0)
{
if ((MoveDatabase::GetRookAttacks(OccupiedSquares, to) & slidingAttackers) != 0) return true;
}
// diagonals
slidingAttackers = Pieces(enemyColor, PieceType::Queen) | Pieces(enemyColor, PieceType::Bishop);
if (slidingAttackers != 0)
{
if ((MoveDatabase::GetH1A8DiagonalAttacks(OccupiedSquares, to) & slidingAttackers) != 0) return true;
if ((MoveDatabase::GetA1H8DiagonalAttacks(OccupiedSquares, to) & slidingAttackers) != 0) return true;
}
}
return false;
}
std::string Board::GetFen() const
{
using namespace Utils::Square;
using namespace Utils::Piece;
std::string fen = "";
// piece placement
for (int r = 7; r >= 0; r--)
{
int empty = 0;
for (int c = 0; c < 8; c++)
{
if (pieceSet[GetSquareIndex(c, r)].Type == PieceType::None)
empty++;
else
{
if (empty != 0)
{
fen += (char)empty + '0';
empty = 0;
}
fen += GetInitial(pieceSet[GetSquareIndex(c, r)]);
}
}
if (empty != 0)
fen += (char)empty + '0';
if (r > 0)
fen += '/';
}
fen += " ";
// side to move
if (sideToMove == PieceColor::White)
fen += "w";
else
fen += "b";
fen += " ";
// castling rights
if (castlingStatus)
{
fen += (castlingStatus & Constants::Castle::WhiteCastleOO ? "K" : "");
fen += (castlingStatus & Constants::Castle::WhiteCastleOOO ? "Q" : "");
fen += (castlingStatus & Constants::Castle::BlackCastleOO ? "k" : "");
fen += (castlingStatus & Constants::Castle::BlackCastleOOO ? "q" : "");
}
else
fen += '-';
fen += " ";
// en passant
if (enPassantSquare != Constants::Squares::Invalid)
fen += ToAlgebraic(enPassantSquare);
else
fen += '-';
fen += " ";
fen += "0 1";
return fen;
}
}