Incorrect output

#1

i am getting 51 output instead of 36 if i take a 3x3 board .
can anyone tell me why?
my code.

package Section_10_Backtracking;

public class N_Knights {
static int count = 0;

public static void main(String[] args) {
	knight_not_kill(new boolean[3][3], 0, 0, 0, 3, "");
}

public static void knight_not_kill(boolean[][] board, int row, int col, int qsf, int tq, String ans) {
	if (qsf == tq) {
		count++;
		System.out.println(count + ". " + ans);
		return;
	}
	if (col == board[0].length) {
		row++;
		col = 0;
	}
	if (row == board.length) {
		return;
	}
	if (is_safe(board, row, col)) {
		board[row][col] = true;
		knight_not_kill(board, row, col + 1, qsf + 1, tq, ans + row + col + " ");
		board[row][col] = false;
	}
	knight_not_kill(board, row, col + 1, qsf, tq, ans);
}

public static boolean is_safe(boolean[][] board, int row, int col) {
	int[] rarray = new int[] { -1, -2, -2, -1 };
	int[] carray = new int[] { -2, -1, 1, 2 };
	for (int i = 0; i < 4; i++) {
		int r = row + rarray[i];
		int c = col + rarray[i];
		if (r >= 0 && c >= 0 && r < board.length && c < board[0].length) {
			if (board[r][c] == true) {
				return false;
			}
		}
	}
	return true;
}

}

#2

Hey @VinayakSingh11111
Just a change in is_safe fun
public static boolean is_safe(boolean[][] board, int row, int col) {
int[] rarray = new int[] { -1, -2, -2, -1 };
int[] carray = new int[] { -2, -1, 1, 2 };
for (int i = 0; i < 4; i++) {
int r = row + rarray[i];
// int c = col + rarray[i]; // carray aayega
int c = col + carray[i];
if (r >= 0 && c >= 0 && r < board.length && c < board[0].length) {
if (board[r][c] == true) {
return false;
}
}
}
return true;
}