small straight in yahtzee is 4 dice in a row, large is 5 dice in a row. I do not know what version of yahtzee you played but 35 years ago, if you rolled 1,2,3,4 that's a small straight. Or 3,4,5,6. Small being the number of scorable dice. Maybe things have changed. Also the scoring for a small straight was a flat rate and a large I think was double that, not sure . going back a ways