When playing bitcoin minefield

The key is to memorize patterns of empty boxes, 
the biggest probability to win is to free bet 2 times, 
memorize a box that stayed empty for both times 
and most likely it will be empty for the third time when you place your bet. 
It is not a guaranteed winning, 
but I've earned nearly 16 BTC with this technique throughout the period of 1 month.

http://cur.lv/895sn