Problem H

//============================================================================
// Name        : ACM
// Author      : Tarango Khan
// Team        : BRACU Byteheads
//============================================================================

#include <bits/stdc++.h>
using namespace std;
#define Size 100005
#define Max 9999999

struct pos{
    int r;
    int c;
    pos(int a,int b){
        r = a;
        c = b;
    }
};

int row, col;
char G[505][505];
int taken[505][505];
bool visited[505][505];
int dx[] = {1,-1,0,0};
int dy[] = {0,0,1,-1};
int sr, sc, tr, tc;

int isValid(int r, int c) {
    if (r <= 0 || c <= 0 || r > row || c > col)
        return false;
    return true;
}

bool call() {
    pos p(sr, sc);
    visited[sr][sc] = true;
    queue<pos> Q;
    Q.push(p);
    int rr, cc;
    while (Q.empty() == false) {
        pos cur = Q.front();
        Q.pop();
        //printf("Cur r: %d , c: %d\n",cur.r,cur.c);
        if (cur.r == tr && cur.c == tc) {
            return true;
        }
        for(int i = 0;i<4;i++){
            rr = cur.r + dx[i];
            cc = cur.c + dy[i];
            if (isValid(rr, cc) == true && visited[rr][cc] == false) {
                if(G[rr][cc] == '.' || taken[rr][cc] >= 1){
                    G[rr][cc] = '.';
                    visited[rr][cc] = true;
                    pos p(rr,cc);
                    Q.push(p);
                }
                if(G[rr][cc] == '*'){
                    taken[rr][cc]++;
                }
            }
        }
    }
    return false;
}


int main() {
    string s;
    int nCase;
    //scanf("%d", &nCase);
    cin >> nCase;
    for (int cs = 1; cs <= nCase; cs++) {
        //scanf("%d %d", &row, &col);
        cin >> row >> col;
        for (int i = 0; i < row; i++) {
            cin >> s;
            for (int j = 0; j < col; j++) {
                G[i+1][j+1] = s[j];
            }
        }
        //scanf("%d %d %d %d", &sr, &sc, &tr, &tc);
        cin >> sr >> sc >> tr >> tc;
        //printf("sr: %d , sc: %d\n",sr,sc);
        memset(taken,0,sizeof(taken));
        memset(visited,false,sizeof(visited));
        //printf("Taken Input\n");
        bool res = call();
        if(res == true) printf("YES\n");
        else printf("NO\n");
    }
}