+---+---+---+---+---+
6 |   |   | 0 |   |   |   
  +---+---+---+---+---+
5 | 0 |   |   |   |   |
  +---+---+---+---+---+
4 |   | 1 | ? |   | 0 |   
  +---+---+---+---+---+
3 |   | 1 | ? | 1 |   |   
  +---+---+---+---+---+
2 | 0 |   |   |   |   |   
  +---+---+---+---+---+
1 |   | 0 |   |   |   |
  +---+---+---+---+---+

See? The frog can be anywhere on the ?-squares.