Regardless of the skill level of your bowling, missing spares will definately lower your game and most likely, affect your attitude. Obviously there is nothing more frustrating than stringing three or four strikes and then following up by missing several easy spares. Although the tutorial is directed toward the newer bowler, the advise she offers is applicable to the most experienced bowler. This is the standard method for converting spares. When preparing to convert spares, bowlers move a certain number of boards right or left, depending on which pins remain standing.
Adjustments begin at the starting place for the strike ball delivery.
The pin closest to the bowler is the key pin. It governs decision making. It must be the first pin hit. For instance, when the 4 - 5 pin spare is standing, the key pin is where the 2 pin would've been standing. When remaining pins stand to the right of the head pin, adjustments start, not from the strike ball position, but from the position where the 10 pin spare is converted.