Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

h, w = map(int, input().split())
start_h, start_w = map(int, input().split())
goal_h, goal_w = map(int, input().split())

start_h += 1
start_w += 1
goal_h += 1
goal_w += 1

s = ["#"*(w+4)]
s.append("#"*(w+4))
for _ in range(h):
    s.append("##" + input() + "##")
s.append("#"*(w+4))
s.append("#"*(w+4))

ans = [[-1]*(w+4) for _ in range(h+4)]
for i in range(h+4):
    for j in range(w+4):
        if s[i][j] == "#":
            ans[i][j] = -2
ans[start_h][start_w] = 0

move1 = [(-1, 0), (1, 0), (0, -1), (0, 1)]
move2 = [(-2, -2), (-2, -1), (-2, 0), (-2, 1), (-2, 2),(-1, -2), (-1, -1), (-1, 0), (-1, 1), (-1, 2),(0, -2), (0, -1), (0, 0), (0, 1), (0, 2),(1, -2), (1, -1), (1, 0), (1, 1), (1, 2),(2, -2), (2, -1), (2, 0), (2, 1), (2, 2)]

yet = deque([(start_h, start_w)])
done = deque()

while len(yet) > 0:
    x1, y1 = yet.popleft()
    done.append((x1, y1))
    for (p, q) in move1:
        v1, v2 = x1+p, y1+q
        if ans[v1][v2] == -1: #"."でまだ辿り着いていないマス
            yet.append((v1, v2))
            ans[v1][v2] = ans[x1][y1]

    if len(yet) == 0:
        while len(done) > 0:
            x2, y2 = done.popleft()
            for (p, q) in move2:
                i, j = x2+p, y2+q
                if ans[i][j] == -1:
                    ans[i][j] = ans[x2][y2]+1
                    yet.append((i, j))

print(ans[goal_h][goal_w])


Fixed submission:
from collections import deque

h, w = map(int, input().split())
start_h, start_w = map(int, input().split())
goal_h, goal_w = map(int, input().split())

start_h += 1
start_w += 1
goal_h += 1
goal_w += 1

s = ["#"*(w+4)]
s.append("#"*(w+4))
for _ in range(h):
    s.append("##" + input() + "##")
s.append("#"*(w+4))
s.append("#"*(w+4))

ans = [[-1]*(w+4) for _ in range(h+4)]
for i in range(h+4):
    for j in range(w+4):
        if s[i][j] == "#":
            ans[i][j] = -2
ans[start_h][start_w] = 0

move1 = [(-1, 0), (1, 0), (0, -1), (0, 1)]
move2 = [(-2, -2), (-2, -1), (-2, 0), (-2, 1), (-2, 2),(-1, -2), (-1, -1), (-1, 0), (-1, 1), (-1, 2),(0, -2), (0, -1), (0, 0), (0, 1), (0, 2),(1, -2), (1, -1), (1, 0), (1, 1), (1, 2),(2, -2), (2, -1), (2, 0), (2, 1), (2, 2)]

yet = deque([(start_h, start_w)])
done = deque()

while len(yet) > 0:
    x1, y1 = yet.popleft()
    done.append((x1, y1))
    for (p, q) in move1:
        v1, v2 = x1+p, y1+q
        if ans[v1][v2] == -1: #"."でまだ辿り着いていないマス
            yet.append((v1, v2))
            ans[v1][v2] = ans[x1][y1]

    if len(yet) == 0:
        while len(done) > 0:
            x2, y2 = done.popleft()
            for (p, q) in move2:
                i, j = x2+p, y2+q
                if ans[i][j] == -1:
                    ans[i][j] = ans[x2][y2]+1
                    yet.append((i, j))

print(ans[goal_h][goal_w])

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

h, w = map(int, input().split())
start_h, start_w = map(int, input().split())
goal_h, goal_w = map(int, input().split())

start_h += 1
start_w += 1
goal_h += 1
goal_w += 1

s = ["#"*(w+4)]
s.append("#"*(w+4))
for _ in range(h):
    s.append("##" + input() + "##")
s.append("#"*(w+4))
s.append("#"*(w+4))

ans = [[-1]*(w+4) for _ in range(h+4)]
for i in range(h+4):
    for j in range(w+4):
        if s[i][j] == "#":
            ans[i][j] = -2
ans[start_h][start_w] = 0

move1 = [(-1, 0), (1, 0), (0, -1), (0, 1)]
move2 = [(-2, -2), (-2, -1), (-2, 0), (-2, 1), (-2, 2),(-1, -2), (-1, -1), (-1, 0), (-1, 1), (-1, 2),(0, -2), (0, -1), (0, 0), (0, 1), (0, 2),(1, -2), (1, -1), (1, 0), (1, 1), (1, 2),(2, -2), (2, -1), (2, 0), (2, 1), (2, 2)]

yet = deque([(start_h, start_w)])
done = deque()

while yet:
    x1, y1 = yet.popleft()
    done.append((x1, y1))
    for (p, q) in move1:
        v1, v2 = x1+p, y1+q
        if ans[v1][v2] == -1: 
            yet.append((v1, v2))
            ans[v1][v2] = ans[x1][y1]

    if len(yet) == 0:
        while done:
            x2, y2 = done.popleft()
            for (p, q) in move2:
                i, j = x2+p, y2+q
                if ans[i][j] == -1:
                    ans[i][j] = ans[x2][y2]+1
                    yet.append((i, j))

print(ans[goal_h][goal_w])


Fixed submission:
from collections import deque

h, w = map(int, input().split())
start_h, start_w = map(int, input().split())
goal_h, goal_w = map(int, input().split())

start_h += 1
start_w += 1
goal_h += 1
goal_w += 1

s = ["#"*(w+4)]
s.append("#"*(w+4))
for _ in range(h):
    s.append("##" + input() + "##")
s.append("#"*(w+4))
s.append("#"*(w+4))

ans = [[-1]*(w+4) for _ in range(h+4)]
for i in range(h+4):
    for j in range(w+4):
        if s[i][j] == "#":
            ans[i][j] = -2
ans[start_h][start_w] = 0

move1 = [(-1, 0), (1, 0), (0, -1), (0, 1)]
move2 = [(-2, -2), (-2, -1), (-2, 0), (-2, 1), (-2, 2),(-1, -2), (-1, -1), (-1, 0), (-1, 1), (-1, 2),(0, -2), (0, -1), (0, 0), (0, 1), (0, 2),(1, -2), (1, -1), (1, 0), (1, 1), (1, 2),(2, -2), (2, -1), (2, 0), (2, 1), (2, 2)]

yet = deque([(start_h, start_w)])
done = deque()

while len(yet) > 0:
    x1, y1 = yet.popleft()
    done.append((x1, y1))
    for (p, q) in move1:
        v1, v2 = x1+p, y1+q
        if ans[v1][v2] == -1: #"."でまだ辿り着いていないマス
            yet.append((v1, v2))
            ans[v1][v2] = ans[x1][y1]

    if len(yet) == 0:
        while len(done) > 0:
            x2, y2 = done.popleft()
            for (p, q) in move2:
                i, j = x2+p, y2+q
                if ans[i][j] == -1:
                    ans[i][j] = ans[x2][y2]+1
                    yet.append((i, j))

print(ans[goal_h][goal_w])

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

h, w = map(int, input().split())
start_h, start_w = map(lambda x: int(x)+1, input().split())
goal_h, goal_w = map(lambda x: int(x)+1, input().split())

s = ["#"*(w+4)]
s.append("#"*(w+4))
for _ in range(h):
    s.append("##" + input() + "##")
s.append("#"*(w+4))
s.append("#"*(w+4))

ans = [[-1]*(w+4) for _ in range(h+4)]
for i in range(h+4):
    for j in range(w+4):
        if s[i][j] == "#":
            ans[i][j] = -2
ans[start_h][start_w] = 0

move1 = [(-1, 0), (1, 0), (0, -1), (0, 1)]
move2 = [(-2, -2), (-2, -1), (-2, 0), (-2, 1), (-2, 2),(-1, -2), (-1, -1), (-1, 0), (-1, 1), (-1, 2),(0, -2), (0, -1), (0, 0), (0, 1), (0, 2),(1, -2), (1, -1), (1, 0), (1, 1), (1, 2),(2, -2), (2, -1), (2, 0), (2, 1), (2, 2)]

yet = deque([(start_h, start_w)])
done = deque()

while yet:
    x1, y1 = yet.popleft()
    done.append((x1, y1))
    for (p, q) in move1:
        v1, v2 = x1+p, y1+q
        if ans[v1][v2] == -1: #"."でまだ辿り着いていないマス
            yet.append((v1, v2))
            ans[v1][v2] = ans[x1][y1]

    if len(yet) == 0:
        while done:
            x2, y2 = done.popleft()
            for (p, q) in move2:
                i, j = x2+p, y2+q
                if ans[i][j] == -1:
                    ans[i][j] = ans[x2][y2]+1
                    yet.append((i, j))

print(ans[goal_h][goal_w])


Fixed submission:
from collections import deque

h, w = map(int, input().split())
start_h, start_w = map(int, input().split())
goal_h, goal_w = map(int, input().split())

start_h += 1
start_w += 1
goal_h += 1
goal_w += 1

s = ["#"*(w+4)]
s.append("#"*(w+4))
for _ in range(h):
    s.append("##" + input() + "##")
s.append("#"*(w+4))
s.append("#"*(w+4))

ans = [[-1]*(w+4) for _ in range(h+4)]
for i in range(h+4):
    for j in range(w+4):
        if s[i][j] == "#":
            ans[i][j] = -2
ans[start_h][start_w] = 0

move1 = [(-1, 0), (1, 0), (0, -1), (0, 1)]
move2 = [(-2, -2), (-2, -1), (-2, 0), (-2, 1), (-2, 2),(-1, -2), (-1, -1), (-1, 0), (-1, 1), (-1, 2),(0, -2), (0, -1), (0, 0), (0, 1), (0, 2),(1, -2), (1, -1), (1, 0), (1, 1), (1, 2),(2, -2), (2, -1), (2, 0), (2, 1), (2, 2)]

yet = deque([(start_h, start_w)])
done = deque()

while len(yet) > 0:
    x1, y1 = yet.popleft()
    done.append((x1, y1))
    for (p, q) in move1:
        v1, v2 = x1+p, y1+q
        if ans[v1][v2] == -1: #"."でまだ辿り着いていないマス
            yet.append((v1, v2))
            ans[v1][v2] = ans[x1][y1]

    if len(yet) == 0:
        while len(done) > 0:
            x2, y2 = done.popleft()
            for (p, q) in move2:
                i, j = x2+p, y2+q
                if ans[i][j] == -1:
                    ans[i][j] = ans[x2][y2]+1
                    yet.append((i, j))

print(ans[goal_h][goal_w])