I insert tikzpicture in a table, but the picture is always not in the center of the cell, especially when in a multirow. This is my code:

```
\begin{table}[H]
\begin{center}
\begin{tabular}{cccccc} 
\hline 
Graph & Situation & EV.diff. & Real.diff. & Best response& \# of obs. \\
\hline 
 \multirow{2}[2]{*}[2mm]{
\begin{tikzpicture}
\tikzstyle{player}= [circle, draw=blue!50, fill=blue!20, inner sep= 0pt,  minimum size=6mm]
\tikzstyle{line}=[-,draw=blue,shorten >=1pt,>=stealth',semithick]
\node[player] (1) at (0,0) {$1$};
\node[player] (2)   at +(0: 1)  {$2$};
\node[player] (3)   at +(0: 2)  {$3$};
\draw (1) to (2)  [line];
\draw (2) to (3)  [line];
\end{tikzpicture}
}
&   1 (3) $\rightarrow$  2  & 4 & 3.7  & 0.854  & 151 \bigstrut\\
&   2 $\rightarrow$ 1 (3)  & -12   & -12    & 0.948 & 77 \bigstrut\\ 

\begin{tikzpicture}
\tikzstyle{player}= [circle, draw=blue!50, fill=blue!20, inner sep=0pt, minimum size=6mm]
\tikzstyle{line}=[-,draw=blue,shorten >=1pt,>=stealth',semithick]
\node[player] (1) at (0,0) {$1$};
\node[player] (2)   at (0.7, 1.08)  {$2$};
\node[player] (3)   at (1.4, 0)  {$3$};
\draw (1) to (2)  [line];
\draw (2) to (3)  [line];
\draw (1) to (3)  [line];
\end{tikzpicture} 

\cline{2-6}
& 2  (3)    $\rightarrow$  1  &  4     & 2.67    & 0.24 & 25  \bigstrut\\  

\multirow{5}[5]{*}{
\begin{tikzpicture}
\tikzstyle{player}= [circle, draw=blue!50, fill=blue!20, inner sep=0pt, minimum size=6mm]
\tikzstyle{line}=[-,draw=blue,shorten >=1pt,>=stealth',semithick]
\node[player] (1) at (0,0) {$1$};
\node[player] (2)   at (-0.7, -1.08)  {$2$};
\node[player] (3)   at (0.7, -1.08)  {$3$};
\node[player] (4)   at (1.4, 0)  {$4$};
\draw (1) to (2)  [line];
\draw (1) to (3)  [line];
\draw (1) to (4)  [line];
\draw (3) to (4)  [line];
\end{tikzpicture}
}
\cline{2-6}
& 2 $\rightarrow$ 1  &  -1.33    & 0.8  & 0.39 & 41 \bigstrut\\
& 3  (4)  $\rightarrow$ 1  & 4      & 4.17 & 0.889  & 27 \bigstrut\\
& 3  (4)  $\rightarrow$ 4  (3)  & -4.7   & -6.33  & 0.676  & 37 \bigstrut\\
& 1 $\rightarrow$  3   (4)  & 4    &  4.25 & 0.5 & 32 \bigstrut\\
& 1 $\rightarrow$ 2 & -12   & -12   & 1     & 13 \bigstrut\\          

\hline
\end{tabular}
\end{center}
\end{table}

```

The table looks like this:
[![enter image description here](https://i.stack.imgur.com/32sj7.png)](https://i.stack.imgur.com/32sj7.png)

I want to place the picture and text in the in the center of each cell of the table.