Conditional move gone wrong : Will never again make a conditional move

This game against my friend, where I had a better position and was about to win my opponents Queen. Seeing the posibility of winning the Q, I made a conditional move, where i intended to make my 33rd move, Rd2+. But a mouse slip spoiled it. Tried to delete the move, but my opponent had made his, and was about to loose the game... Was a real scare....