#maze rabirynce
def ab(a1):
    if a1<0:
        a1*=-1
    return a
    
h,w=(int(i) for i in input().split())
sx,sy,gx,gy=(int(i) for i in input().split())
b=[[int(i) for i in input().split()] for i in range(H)]
v=[[sx,sy]]
Nd=0
i=0
a=[0]*w*h
while Nd<1 and i<h*w+1:
    j=0
    v.append([])
    while j<len(v[i]):
        tx=v[i][j][0]
        ty=v[i][j][1]
        for k in range(2):
            for l in range(2):
                k+=2
                l+=2
                k=-1**k
                l=-1**l
                ux=tx+k
                uy=ty+l
                if ux>=0 and ux<w and uy>=0 and uy<h and a[ux][uy]==0 and ab(b[tx,ty]-b[ux,uy])==1:
                    a[ux][uy]=1
                    v[i+1].append([ux,uy])
        for k in range(2):
            for l in range(2):
                k+=2
                l+=2
                k=-1**k
                l=-1**l
                k*=2
                l*=2
                ux=tx+k
                uy=ty+l
                if ux>=0 and ux<w and uy>=0 and uy<h and a[ux][uy]==0 and b[tx,ty]==b[ux,uy]:
                    a[ux][uy]=1
                    v[i+1].append([ux,uy])
        j+=1
        if v[i+1]==[]:
            Nd=2
    i+=1
if Nd==1:
    p="YES"
else:
    p="NO"
print(p)