+------+----------+
| side | name     |
+------+----------+
| B    | Mika K   |
| B    | Oleg F   |
| B    | Andrei G |
| B    | Niko B   |
| B    | Markku L |
| W    | Kimmo M  |
| W    | Juha V   |
| W    | Niklas S |
| W    | Matias K |
| W    | Hannu K  |
+------+----------+
10 rows in set (0,018 sec)

musta

+------+----------+
| side | name |
+------+----------+
| B | Jani T |
| B | Niklas S |
| B | Markku L |
| B | Andrei G |
| B | Kalle R |
| W | Kimmo M |
| W | Arto V |
| W | Marko R |
| W | Oleg F |
| W | Mika K |
+------+----------+
10 rows in set (0,000 sec)

+------+----------+
| side | name |
+------+----------+
| B | Mika K |
| B | Oleg F |
| B | Kalle R |
| B | Marko R |
| B | Jani T |
| W | Niko B |
| W | Markku L |
| W | Arto V |
| W | Andrei G |
| W | Kimmo M |
+------+----------+
10 rows in set (0,091 sec)

5 enrolled so far. Let's have a game anyway and make the teams on the field, maybe rotating.

min 6

+------+----------+
| side | name |
+------+----------+
| B | Mika K |
| B | Niko B |
| B | Andrei G |
| B | Markku L |
| W | Marko R |
| W | Oleg F |
| W | Jani T |
| W | Kimmo M |
+------+----------+
8 rows in set (0,018 sec)