Here I roll the perfect roll and was playing for the match score 3-4 i was trailing. Cube is at 4. Perfect roll to win the match. I move both checkers out like I was supposed to them suddenly realized I can make a home point with 66 so what do I do.. Yep.. i undid the move and hit with one checker and made the home point. Gnubg rated it as a -16.20% blunder which is about as big a blunder one can make. It reduced my chances from 77 down to 61%, And yes, i did get punished for the mistake and lost the match
I would normally not make such a mistake but I was playing carelessly this day and I had something of a flaw in the way I percieved the position. I somehow mistakenly imagined that the second play would result in both back checkers coming out to the bar point while making the home board point. Ofcourse one checker is still buried behind that huge prime in the bad play by the time i hit and made the home point i forgot about the back checker still left behind, and finished the move. A double roll can lure us into erros because we dont take time to consider all the increased possible moves.
This is where you will notice the diff between top players and amateurs. The top players always pause and think before they make a play on a double roll.