Let $\mathbb B^n$ be a unit ball in $\mathbb R^n$ and let $F$ be a smooth function on it. Let $\mathbb B^k$ be a unit ball in $\mathbb R^k$.

**Question.** Is it true that $F$ has a critical point in the interior of $\mathbb B^n$ if there exists a smooth surjective map $\varphi:\mathbb B^n\to \mathbb B^k$, that has the following properties:

1) For any point $x\in \mathbb B^k$ the minimum of $F|_{\varphi^{-1}(x)}$ is attained in the interior of $\mathbb B^n$. 

2) The maximum 
$$\max_{y\in B}\min_{x\in \varphi^{-1}(y)} F(x)$$
is attained in the interior of $\mathbb B^k$.

**Comment.** The answer is clearly positive if the differential of $\varphi$ is surjective on the whole ball $\mathbb B^n$.

I would be grateful for a reference (or a counter-example which sounds less likely...).