Save your best bowler for the over you fear, not the last one

Captains hoard their finest death bowler for the twentieth over out of habit, and the match is usually lost two overs earlier.

There is an unspoken convention that the best death bowler bowls last. It feels correct. The final over is the dramatic one, the one that ends up on the highlights, the one a captain will be asked about afterwards. It is also, quite often, the least important over in the innings.

Work through a chase. The batting side needs forty from four overs, which is difficult, and a set batter is on strike facing a bowler who is fifth choice because the good ones are being saved. He takes eighteen off that over. Now they need twenty two from three with the same batter in, and the match has effectively turned, and your finest bowler is still standing at fine leg waiting for a moment that will never carry the same weight.

The general principle is that a bowler should be spent where the variance is highest, and variance is highest when a set batter is facing a weak bowler with the required rate still reachable. That is usually the sixteenth or seventeenth over. By the twentieth, the game is either gone or won, and the marginal value of quality is much lower.

Captains resist for reasons that are mostly about blame. If you use your best bowler in the sixteenth and lose in the twentieth, the question afterwards is why he was not available, and it is a question you cannot answer without a paragraph about expected value that nobody wants to hear. If you save him and lose anyway, you followed convention, and convention is a shelter.

There is a legitimate defence of the tradition. A specialist death bowler has practised the specific skills of the last over, including the wet ball and the field with everybody out, and moving him earlier puts him into a phase with different demands and fielding restrictions.

I still think the phase matters less than the batter. Bowl your best man at the best batter, at the moment the match is genuinely undecided, and accept that somebody else will have to hold their nerve at the end.

The teams who do this look reckless for about a season. Then they look clever, and everybody copies them, and the convention quietly changes without anybody admitting it was ever wrong.