Manhattan Bluetooth Board game

Two players with mobile phones are needed for this game - they are connected by bluetooth and the game can start:

First every player selects his position on the field. This field is not visible for the opponent. The opponent tries to hit this position. Each player tries alternately. If a player hits the position of the opponent he wins. If he hits another field the distance to the target field is shown. The distance is calculated as the sum of the vertical and horizontal difference. This is also called: Manhattan distance, see also:

https://en.wikipedia.org/wiki/Taxicab_geometry