private void addPossiPawnMove(
Color pawncolor, Position position, State temp_result, ArrayList<Move> temp_position) {
int row = position.getRow();
int col = position.getCol();
Position kingPosition = null;
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 8; j++) {
if (temp_result.getPiece(i, j) != null) {
if (temp_result.getPiece(i, j).equals(new Piece(pawncolor, KING))) {
kingPosition = new Position(i, j);
break;
}
}
}
}
if (pawncolor == WHITE) {
if (row < 7) {
if (row == 1) {
if ((temp_result.getPiece(row + 2, col) == null)
&& (temp_result.getPiece(row + 1, col) == null)) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row + 2, col, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
temp_position.add(new Move(position, new Position(row + 2, col), null));
}
}
}
if (temp_result.getPiece(row + 1, col) == null) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row + 1, col, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
if ((row + 1) == 7) {
temp_position.add(new Move(position, new Position(row + 1, col), QUEEN));
temp_position.add(new Move(position, new Position(row + 1, col), BISHOP));
temp_position.add(new Move(position, new Position(row + 1, col), KNIGHT));
temp_position.add(new Move(position, new Position(row + 1, col), ROOK));
} else temp_position.add(new Move(position, new Position(row + 1, col), null));
}
}
if ((col < 7) && (temp_result.getPiece(row + 1, col + 1) != null)) {
if (temp_result.getPiece(row + 1, col + 1).getColor().equals(pawncolor.getOpposite())) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row + 1, col + 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
if ((row + 1) == 7) {
temp_position.add(new Move(position, new Position(row + 1, col + 1), QUEEN));
temp_position.add(new Move(position, new Position(row + 1, col + 1), BISHOP));
temp_position.add(new Move(position, new Position(row + 1, col + 1), KNIGHT));
temp_position.add(new Move(position, new Position(row + 1, col + 1), ROOK));
} else temp_position.add(new Move(position, new Position(row + 1, col + 1), null));
}
}
} else if ((col < 7) && (temp_result.getPiece(row + 1, col + 1) == null)) {
if ((temp_result.getEnpassantPosition() != null)
&& (temp_result.getEnpassantPosition().equals(new Position(row, col + 1)))) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(temp_result.getEnpassantPosition(), null);
temp.setPiece(row + 1, col + 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
temp_position.add(new Move(position, new Position(row + 1, col + 1), null));
}
}
}
if ((col > 0) && (temp_result.getPiece(row + 1, col - 1) != null)) {
if (temp_result.getPiece(row + 1, col - 1).getColor().equals(pawncolor.getOpposite())) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row + 1, col - 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
if ((row + 1) == 7) {
temp_position.add(new Move(position, new Position(row + 1, col - 1), QUEEN));
temp_position.add(new Move(position, new Position(row + 1, col - 1), BISHOP));
temp_position.add(new Move(position, new Position(row + 1, col - 1), KNIGHT));
temp_position.add(new Move(position, new Position(row + 1, col - 1), ROOK));
} else temp_position.add(new Move(position, new Position(row + 1, col - 1), null));
}
}
} else if ((col > 0) && (temp_result.getPiece(row + 1, col - 1) == null)) {
if ((temp_result.getEnpassantPosition() != null)
&& (temp_result.getEnpassantPosition().equals(new Position(row, col - 1)))) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(temp_result.getEnpassantPosition(), null);
temp.setPiece(row + 1, col - 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
temp_position.add(new Move(position, new Position(row + 1, col - 1), null));
}
}
}
}
}
// black
else {
if (row > 0) {
if (row == 6) {
if ((temp_result.getPiece(row - 2, col) == null)
&& (temp_result.getPiece(row - 1, col) == null)) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row - 2, col, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
temp_position.add(new Move(position, new Position(row - 2, col), null));
}
}
}
if (temp_result.getPiece(row - 1, col) == null) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row - 1, col, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
if ((row - 1) == 0) {
temp_position.add(new Move(position, new Position(row - 1, col), QUEEN));
temp_position.add(new Move(position, new Position(row - 1, col), BISHOP));
temp_position.add(new Move(position, new Position(row - 1, col), KNIGHT));
temp_position.add(new Move(position, new Position(row - 1, col), ROOK));
} else temp_position.add(new Move(position, new Position(row - 1, col), null));
}
}
if ((col < 7) && (temp_result.getPiece(row - 1, col + 1) != null)) {
if (temp_result.getPiece(row - 1, col + 1).getColor().equals(pawncolor.getOpposite())) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row - 1, col + 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
if ((row - 1) == 0) {
temp_position.add(new Move(position, new Position(row - 1, col + 1), QUEEN));
temp_position.add(new Move(position, new Position(row - 1, col + 1), BISHOP));
temp_position.add(new Move(position, new Position(row - 1, col + 1), KNIGHT));
temp_position.add(new Move(position, new Position(row - 1, col + 1), ROOK));
} else temp_position.add(new Move(position, new Position(row - 1, col + 1), null));
}
}
} else if ((col < 7) && (temp_result.getPiece(row - 1, col + 1) == null)) {
if ((temp_result.getEnpassantPosition() != null)
&& (temp_result.getEnpassantPosition().equals(new Position(row, col + 1)))) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(temp_result.getEnpassantPosition(), null);
temp.setPiece(row - 1, col + 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
temp_position.add(new Move(position, new Position(row - 1, col + 1), null));
}
}
}
if ((col > 0) && (temp_result.getPiece(row - 1, col - 1) != null)) {
if (temp_result.getPiece(row - 1, col - 1).getColor().equals(pawncolor.getOpposite())) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(row - 1, col - 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
if ((row - 1) == 0) {
temp_position.add(new Move(position, new Position(row - 1, col - 1), QUEEN));
temp_position.add(new Move(position, new Position(row - 1, col - 1), BISHOP));
temp_position.add(new Move(position, new Position(row - 1, col - 1), KNIGHT));
temp_position.add(new Move(position, new Position(row - 1, col - 1), ROOK));
} else temp_position.add(new Move(position, new Position(row - 1, col - 1), null));
}
}
} else if ((col > 0) && (temp_result.getPiece(row - 1, col - 1) == null)) {
if ((temp_result.getEnpassantPosition() != null)
&& (temp_result.getEnpassantPosition().equals(new Position(row, col - 1)))) {
State temp = temp_result.copy();
temp.setPiece(row, col, null);
temp.setPiece(temp_result.getEnpassantPosition(), null);
temp.setPiece(row - 1, col - 1, temp_result.getPiece(position));
if (!isUnderCheck(pawncolor, temp, kingPosition)) {
temp_position.add(new Move(position, new Position(row - 1, col - 1), null));
}
}
}
}
}
}
