[Did you mean](http://tr.im/4tbdr): checkio = (lambda N, H, R=range, L=len: (lambda *_:0)(*map(*reversed((R(L(H)), lambda i: (lambda *_:0)(*map(*reversed((R(L(H[i])), lambda j: (lambda _:_())(lambda I = i + L(N), J = j + L(N[0]): 0 i More

tmp = sqrt((s%4-(g+v)%4)**2+(s//4-(g+v)//4)**2) Tip: you don't need sqrt here. If you are only comparing distances, you can take advantage of the fact that sqrt(a) < sqrt(b) if and only if a < b. It doesn't matter much in this task, but generally it can be quite useful to work with More

You're right, it's enough to call eval(e) if x and y are already in locals(). More

Nice solution. By the way, the value you attach to the game states is always -1000 or 1000 so you could have used 0 and 1 (or equivalently, False and True) as well. More