# Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 40

### Tell us what’s happening:

Describe your issue in detail here.
shouldnt this if statement execute when odd? i could be overlooking an error somewhere else in the problem

``````NUMBER_OF_DISKS = 4
number_of_moves = 2**NUMBER_OF_DISKS - 1
rods = {
'A': list(range(NUMBER_OF_DISKS, 0, -1)),
'B': [],
'C': []
}

def make_allowed_move(rod1, rod2):
forward = False
if not rods[rod2]:
forward = True
elif rods[rod1] and rods[rod1][-1] < rods[rod2][-1]:
forward = True

if forward:
print(f'Moving disk {rods[rod1][-1]} from {rod1} to {rod2}')
rods[rod2].append(rods[rod1].pop())
else:
print(f'Moving disk {rods[rod2][-1]} from {rod2} to {rod1}')
rods[rod1].append(rods[rod2].pop())

# display our progress
print(rods, '\n')

def move(n, source, auxiliary, target):
# display starting configuration
print(rods, '\n')
for i in range(number_of_moves):
remainder = (i + 1) % 3
if remainder == 1:
if n % 2 != 0:
print(f'Move {i + 1} allowed between {source} and {target}')
make_allowed_move(source, target)

/* User Editable Region */

else:
print(f'Move {i + 1} allowed between {source} and {auxiliary}')
# make_allowed_move(source, auxiliary)

elif remainder == 2:
if n % 2 != 0:
print(f'Move {i + 1} allowed between {source} and {auxiliary}')
# make_allowed_move(source, auxiliary)

/* User Editable Region */

elif remainder == 0:
print(f'Move {i + 1} allowed between {auxiliary} and {target}')
make_allowed_move(auxiliary, target)

# initiate call from source A to target C with auxiliary B
move(NUMBER_OF_DISKS, 'A', 'B', 'C')
``````

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### Challenge Information:

Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 40

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

Hello rqzcnm,

Yes your if statement is correct, but you have to uncomment both of the `make_allowed_move` function calls.

2 Likes

“Also, turn the `# make_allowed_move(source, auxiliary)` comment into code”
“Also, turn the `# make_allowed_move(source, auxiliary)` into a comment.”