The wobble seam quietly rewrote what medium pace can do

A delivery that gives up control of direction in exchange for uncertainty has become the most useful ball in Test cricket.

Conventional swing asks a great deal. A shiny side, a rough side, a wrist that holds an angle, air that cooperates, and a bowler who has practised for years. The wobble seam asks for almost none of that, and it does something conventional swing cannot, which is to make the bowler himself uncertain about which way the ball will go.

The mechanics are almost rude in their simplicity. Instead of holding the seam upright and pointing it at slip, the fingers are spread and the ball is released so the seam rotates slightly, oscillating rather than spinning cleanly. When it lands it is somewhere in a range of angles rather than at one angle, and it deviates accordingly, sometimes in, sometimes away, sometimes not at all. The batter cannot read it because there is nothing to read. Neither can the bowler, which is the part that took the sport a while to accept.

That trade, giving up control of direction to buy unpredictability, only pays at certain speeds. Too slow and there is time to adjust after pitching. Too fast and the deviation happens too close to matter, though a few very quick bowlers get away with it because the batter is already late. The sweet band sits somewhere in the high seventies to mid eighties in miles per hour, which is exactly where the honest, hard working seamer lives. A generation of bowlers who would once have been described as containing options now take wickets on flat pitches.

It has changed field settings too. A wobble seamer wants both edges in play, which argues for a slip and a gully and a catcher square on the leg side, a shape that looks old fashioned and works because the ball genuinely goes both ways.

My reservation is about coaching young bowlers into it early. It is easy to learn, produces results quickly at junior level, and can substitute for the harder skills of wrist position and swing that take years to build and that nothing else replaces on a day when the ball is doing plenty. Learn the difficult thing first. Add the wobble at twenty.

Grounds staff will eventually respond by producing surfaces that give the seam nothing, and the balance will shift again.

Until then, the least glamorous delivery in the game is the one I would most hate to face.