I just played a game of minesweeper where I saw that there were two pairs of unknown squares which each a chance of 50% for a good guess. I guessed well both times. One second later I came to the conclusion I had to make a 50% shot again; and again I succeeded. Realising this will probably be one of the most lucky games I ever played I accidentally clicked on a square where I knew there is a mine... <img src="rolleyes.gif" border="0">