From Scheinwold's Column

K 9
A 5 3
8 7 6 3
A K 7 5
6 5 4 3 2
K Q J 10 7 9 8 6 2
A K J Q 10
10 9 8 2 Q 6 4
A Q J 10 8 7
4 Vul: Both
9 5 4 2 Contract: 4 spades
J 3 Opening lead: K of hearts

This is from Scheinwold's column, as noted, but since I haven't found many examples and it's a concept worth emphasizing, I thought I'd offer it, giving due credit. As played, declarer won the opening lead with the ace, drew four rounds of trump and led a diamond. West won and led another heart, forcing declarer to ruff, whereupon, declarer led another diamond, West another heart, ruffed by declarer, and how many trump does he have left? Yeah, you got it! He's out of trump. Now when he knocks out the defense's last diamond, West was able to cash two heart tricks for down two.
But declarer had a counter to that forcing game, the columnist notes, which was to lead a diamond at trick two. West wins, leads another heart, declarer ruffs, leads another diamond, whereupon West forces with another heart, leaving declarer with how many trump? Well, he's ruffed only twice, so he's got four. Now declarer leads the third round of diamonds, and West can force him in the long hand no more, for declarer could ruff a heart in dummy, draw trump and claim.
The hand is just a little too pat for my tastes, as many columnists' hands are. It's kinda convenient that declarer has every trump down to the 7, the five lowest spots with the defense. The diamonds also show the 5 highest with one side, the defense, the 8 lowest with declarer. It's hard to escape the feeling that the deviser of the hand was too lazy to mix up the cards a bit in a way that didn't undercut his point. In real life, with a smattering of high spots, say the 10 8 x x in East's hand, he discards a heart on the third round of diamonds, and now it takes the K to win the fourth round of hearts, East holds the tenace over the 9 and the defense gets a trump trick. Or maybe West holds the long trump, say 9-high and East a stiff 10, and now an uppercut, or threat of one, promotes a trump trick. But that's the hand that was given, and in any event, the value of a forcing game, even against a powerful 6-card holding is evident.
B'gorry, another forcing game where declarer has a counter to it. Well, I've still got my eyes peeled.