QSTM, short for Quarter Slice Turn Metric, is a move count metric for the 3x3x3 in which any clockwise or counterclockwise 90-degree turn of any layer counts as one turn, and rotations do not count as moves.

This differs from QTM in that a slice move counts as one turn, not two; and it differs from STM in that 180-degree turns in any layer count as two moves, not one.

God's Number in QSTM is likely around 23-26 moves, but the exact number has not yet been proven.

See Also