The weak-NT partner: when a hand is unsuitable for 1NT, Acol opens a suit and finds a fit. Here you count losers, not winners — then dispose of the extra ones by ruffing, discarding or finessing, and get the trump timing right.
Loser counts, dummy cover, ruffs and finesses are computed by the standard method. Whether the plan actually brings the contract home depends on the breaks and your timing — that judgement is the lesson. The defenders play a simple, honest system.