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KING.cpp
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KING.cpp
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#include <iostream>
#include <string>
using namespace std;
// KING VALID MOVE CHECKING FUNCTION
void COPY_BOARD(string [][8], string [][8], bool);
bool King_valid_move(string piece, int po_row, int po_column, int row, int column, string dummy_board[][8],int turn,bool& castling)
{
// local variables
string board[8][8] = {" "};
COPY_BOARD(dummy_board, board, false);
board[po_row][po_column] = " ";
bool king_check = false, flagr1 = true, flagr2 = true, flagc1 = true, flagc2 = true,op_check = false;
if ( ( (piece == "K4") && ((islower(board[row][column].at(0))) || (board[row][column] == " "))) || ( (piece == "k4") && ((isupper(board[row][column].at(0))) || (board[row][column] == " "))) )
{
if ( ( ((row == po_row + 1) || (row == po_row - 1) || (row == po_row)) && ((column == po_column + 1) || (column == po_column - 1) || (column == po_column)) ) || (row == po_row && (column == po_column+2||column == po_column -3 )) )
{
if (row == po_row && column == po_column)
{
return false;
}
if (turn % 2 == 0)
{
//*********************************//
// IF PAWN CHECK //
//*********************************//
if ((board[row + 1][column + 1].at(0) == 'P') || (board[row + 1][column - 1].at(0) == 'P'))
{
return false;
}
//*********************************//
// IF KNIGHT CHECK //
//*********************************//
if (
((row > 1 && column > 0) && (board[row - 2][column - 1].at(0) == 'K' && board[row - 2][column - 1] != "K4")) ||
((row > 1 && column < 7) && (board[row - 2][column + 1].at(0) == 'K' && board[row - 2][column + 1] != "K4")) ||
((row < 6 && column < 7) && (board[row + 2][column + 1].at(0) == 'K' && board[row + 2][column + 1] != "K4")) ||
((row < 6 && column > 0) && (board[row + 2][column - 1].at(0) == 'K' && board[row + 2][column - 1] != "K4")) ||
((row < 7 && column < 6) && (board[row + 1][column + 2].at(0) == 'K' && board[row + 1][column + 2] != "K4")) ||
((row > 0 && column < 6) && (board[row - 1][column + 2].at(0) == 'K' && board[row - 1][column + 2] != "K4")) ||
((row < 7 && column > 1) && (board[row + 1][column - 2].at(0) == 'K' && board[row + 1][column - 2] != "K4")) ||
((row > 0 && column > 1) && (board[row - 1][column - 2].at(0) == 'K' && board[row - 1][column - 2] != "K4")))
{
return false;
}
// opponent kings check
if (
((row > 0 && column > 0) && (board[row - 1][column - 1] == "K4")) ||
((row > 0 && column < 7) && (board[row - 1][column + 1] == "K4")) ||
((row < 7 && column < 7) && (board[row + 1][column + 1] == "K4")) ||
((row < 7 && column > 0) && (board[row + 1][column - 1] == "K4")) ||
((row < 8 && column < 7) && (board[row ][column + 1] == "K4")) ||
((row < 8 && column > 0) && (board[row ][column - 1] == "K4")) ||
((row < 7 && column < 8) && (board[row + 1][column ] == "K4")) ||
((row > 0 && column < 8) && (board[row - 1][column ] == "K4")))
{
return false;
}
// Rook and Queen + check checking code
for (int i = 1;i < 8;++i)
{
if (!flagr1 && !flagr2 && !flagc1 && !flagc2) break;
if ((board[row + i][column] != " ") && (flagr1 == true))
{
flagr1 = false;
if ((row + i < 8) && (board[row + i][column].at(0) == 'Q' || board[row + i][column].at(0) == 'R'))
{
king_check = true;
break;
}
}
if ((board[row - i][column] != " ") && (flagr2 == true))
{
flagr2 = false;
if ((row - i >= 0) && (board[row - i][column].at(0) == 'Q' || board[row - i][column].at(0) == 'R'))
{
king_check = true;
break;
}
}
if ((board[row][column + i] != " ") && (flagc1 == true))
{
flagc1 = false;
if ((column + i < 8) && (board[row][column + i].at(0) == 'Q' || board[row][column + i].at(0) == 'R'))
{
king_check = true;
break;
}
}
if ((board[row][column - i] != " ") && (flagc2 == true))
{
flagc2 = false;
if ((column - i >= 0) && (board[row][column - i].at(0) == 'Q' || board[row][column - i].at(0) == 'R'))
{
king_check = true;
break;
}
}
else continue;
}
if (king_check == true)
{
return false;
}
// reinitializing the flags
flagr1 = true; flagr2 = true; flagc1 = true; flagc2 = true,king_check = false;
// Bishop and Queen cross checks checking code
for (int i = 1;i < 8;++i)
{
if (!flagr1 && !flagr2 && !flagc1 && !flagc2) break;
if ((board[row + i][column + i] != " ") && (flagr1 == true))
{
flagr1 = false;
if (((row + i < 8) && (column + i < 8)) && (board[row + i][column + i].at(0) == 'Q' || board[row + i][column + i].at(0) == 'B'))
{
king_check = true;
break;
}
}
if ((board[row - i][column - i] != " ") && (flagr2 == true))
{
flagr2 = false;
if (((row - i >= 0) && (column - i >= 0)) && (board[row - i][column - i].at(0) == 'Q' || board[row - i][column - i].at(0) == 'B'))
{
king_check = true;
break;
}
}
if ((board[row - i][column + i] != " ") && (flagc1 == true))
{
flagc1 = false;
if (((column + i < 8) && (row - i >= 0)) && (board[row - i][column + i].at(0) == 'Q' || board[row - i][column + i].at(0) == 'B'))
{
king_check = true;
break;
}
}
if ((board[row + i][column - i] != " ") && (flagc2 == true))
{
flagc2 = false;
if (((column - i >= 0) && (row + i < 8)) && (board[row + i][column - i].at(0) == 'Q' || board[row + i][column - i].at(0) == 'B'))
{
king_check = true;
break;
}
}
else continue;
}
if (king_check == true)
{
return false;
}
// Castling case
if (board[row][column] == " ")
{
if ((board[po_row][po_column + 1] == " ") && (board[po_row][po_column + 3].at(0) == 'r'))
{
castling = true;
return true;
}
else if ((board[po_row][po_column - 1] == " ") && (board[po_row][po_column - 4].at(0) == 'r') && (board[po_row][po_column - 2] == " "))
{
castling = true;
return true;
}
}
else return true;
}
else if (turn % 2 != 0)
{
// check from pawn checking
if ((board[row - 1][column + 1].at(0) == 'p') || (board[row - 1][column - 1].at(0) == 'p'))
{
return false;
}
//// check from knights checking
if (
((row > 1 && column > 0) && (board[row - 2][column - 1].at(0) == 'k' && board[row - 2][column - 1] != "k4")) ||
((row > 1 && column < 7) && (board[row - 2][column + 1].at(0) == 'k' && board[row - 2][column + 1] != "k4")) ||
((row < 6 && column < 7) && (board[row + 2][column + 1].at(0) == 'k' && board[row + 2][column + 1] != "k4")) ||
((row < 6 && column > 0) && (board[row + 2][column - 1].at(0) == 'k' && board[row + 2][column - 1] != "k4")) ||
((row < 7 && column < 6) && (board[row + 1][column + 2].at(0) == 'k' && board[row + 1][column + 2] != "k4")) ||
((row > 0 && column < 6) && (board[row - 1][column + 2].at(0) == 'k' && board[row - 1][column + 2] != "k4")) ||
((row < 7 && column > 1) && (board[row + 1][column - 2].at(0) == 'k' && board[row + 1][column - 2] != "k4")) ||
((row > 0 && column > 1) && (board[row - 1][column - 2].at(0) == 'k' && board[row - 1][column - 2] != "k4")))
{
return false;
}
// opponent kings check
if (
((row > 0 && column > 0) && (board[row - 1][column - 1] == "k4")) ||
((row > 0 && column < 7) && (board[row - 1][column + 1] == "k4")) ||
((row < 7 && column < 7) && (board[row + 1][column + 1] == "k4")) ||
((row < 7 && column > 0) && (board[row + 1][column - 1] == "k4")) ||
((row < 8 && column < 7) && (board[row][column + 1] == "k4")) ||
((row < 8 && column > 0) && (board[row][column - 1] == "k4")) ||
((row < 7 && column < 8) && (board[row + 1][column] == "k4")) ||
((row > 0 && column < 8) && (board[row - 1][column] == "k4")))
{
return false;
}
// Queen and rook + check
for (int i = 1;i < 8;++i)
{
if (!flagr1 && !flagr2 && !flagc1 && !flagc2) break;
if ((row + i < 8) && (board[row + i][column] != " ") && (flagr1 == true))
{
flagr1 = false;
if ((board[row + i][column].at(0) == 'q' || board[row + i][column].at(0) == 'r'))
{
king_check = true;
break;
}
}
if ((row - i >= 0) && (board[row - i][column] != " ") && (flagr2 == true))
{
flagr2 = false;
if ((board[row - i][column].at(0) == 'q' || board[row - i][column].at(0) == 'r'))
{
king_check = true;
break;
}
}
if ((column + i < 8) && (board[row][column + i] != " ") && (flagc1 == true))
{
flagc1 = false;
if ((board[row][column + i].at(0) == 'q' || board[row][column + i].at(0) == 'r'))
{
king_check = true;
break;
}
}
if ((column - i >= 0) && (board[row][column - i] != " ") && (flagc2 == true))
{
flagc2 = false;
if ((board[row][column - i].at(0) == 'q' || board[row][column - i].at(0) == 'r'))
{
king_check = true;
break;
}
}
else continue;
}
if (king_check == true)
{
return false;
}
// reinitializing the flags
flagr1 = true; flagr2 = true; flagc1 = true; flagc2 = true;
// Bishop and Queen cross checks checking code
for (int i = 1;i < 8;++i)
{
if (!flagr1 && !flagr2 && !flagc1 && !flagc2) break;
if ((row + i < 8 && column + i < 8) && (board[row + i][column + i] != " ") && (flagr1 == true))
{
flagr1 = false;
if ((board[row + i][column + i].at(0) == 'q' || board[row + i][column + i].at(0) == 'b'))
{
king_check = true;
break;
}
}
if ((row - i >= 0 && column - i >= 0) && (board[row - i][column - i] != " ") && (flagr2 == true))
{
flagr2 = false;
if ((board[row - i][column - i].at(0) == 'q' || board[row - i][column - i].at(0) == 'b'))
{
king_check = true;
break;
}
}
if ((row - i >= 0 && column + i < 8) && (board[row - i][column + i] != " ") && (flagc1 == true))
{
flagc1 = false;
if ((board[row - i][column + i].at(0) == 'q' || board[row - i][column + i].at(0) == 'b'))
{
king_check = true;
break;
}
}
if ((row + i < 8 && column - i >= 0) && (board[row + i][column - i] != " ") && (flagc2 == true))
{
flagc2 = false;
if ((board[row + i][column - i].at(0) == 'q' || board[row + i][column - i].at(0) == 'b'))
{
king_check = true;
break;
}
}
else continue;
}
if (king_check == true)
{
return false;
}
// Castling case
if (board[row][column] == " ")
{
if ((board[po_row][po_column + 1] == " ") && (board[po_row][po_column + 3].at(0) == 'R'))
{
castling = true;
return true;
}
else if ((board[po_row][po_column - 1] == " ") && (board[po_row][po_column - 4].at(0) == 'R') && (board[po_row][po_column - 2] == " "))
{
castling = true;
return true;
}
}
else
{
return true;
}
}
}
else
{
return false;
}
}
else
{
return false;
}
return true;
}