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movement as the fore-sheet was let go, together with the sheets to the head-sails, and Teazer ’s bow began to swing into the wind, the sails slatting busily. Checking away the top bowline and lee fore-brace they heaved around. Kydd saw the motion and bawled, “Rise tacks an’ sheets!”
    The mainsails had lost their taut straining and their lines were manhandled to clear the nettings and other gear as Teazer nosed into the wind. “Haul in! Mainsail haul!” Kydd bellowed.
    Hand over hand the mainyard was braced around at a furious pace, the fore remaining on the old tack. As Teazer rotated through the wind’s eye this levered round the after part of the ship. The fore as well took the wind aback but on the opposite tack, pushing the bows away on to the new course.
    Everyone knew the stakes. It was the synchrony of movements that held the key, and Teazer responded nobly. “Haul of all!” Kydd ordered exultantly—the main would fill and draw just as fast as the new weather tack and lee-sheets could be brought in. The fore was braced around smartly and, with a brisk banging and flapping, the sails caught. Teazer leaned to her new course, the men frantically at work to get in every foot of their hauling.
    It was done—and beautifully. Kydd grunted, satisfied. His ship was as capable as she was pretty.
    As they settled to their rushing passage he looked across at the barque. It was now on the same board and, although it was ahead by a considerable margin, the game was far from over. Their prey was clawing as close to the wind as it could, while Teazer, thanks to Kydd’s patient and careful estimates, lay to the wind with every sail drawing optimally.
    â€œWe’re fore-reaching,” the master admitted, eyeing the other vessel. Their tracks were converging and Teazer was coming up on the barque with every minute. Kydd found himself clenching his fists, frustrated that there now seemed little more that could be done.
    The boatswain cleared his throat awkwardly. “Er, sir, when I was a younker I seen a trick once.”
    â€œOh?”
    â€œTh’ lower yards, sir. T’ increase th’ traverse.”
    A square-rigged ship could lie only about six points to the wind, for the big spars swinging across the ship would come up against the mast stay and shrouds, a natural limit. Kydd glanced at the big mainyard above them, immovably up against the mainstay at the extremity of its traverse. “I’d like to know how, Mr. Purchet.”
    â€œWhy, sir, we slacks off th’ truss-tackle as gives us play, an’ then cants down th’ weather yard-arm while we swigs off on th’ catharpings all we can.” This would allow the yard to slide up and into where the shrouds were at their narrowest—at the cost of the set of the sail.
    From his memory of studying for his lieutenant’s examination Kydd recalled the double tangent rule: the tangent of the angle of the wind to the yard should be twice that between yard and keel. This ensured that even a little achieved would see the effect multiplied. “We do it, Mr. Purchet,” he said. It would be tricky work: with sails drawing hard, the truss-ropes held the big spar against the mast. To slacken them deliberately . . .
    With both main- and fore-course cocked up at an angle they sheeted in once more.
    â€œHalf a point, I’d say,” the master said, clearly impressed.
    While this was not dramatic, it would amount over the miles to several ship’s lengths further to weather. Could it make the difference? Kydd eyed the distances. The object was to point higher into the wind yet retain a faster speed, culminating in an overlap at any distance to windward with the chase at his mercy under his lee. Should they end even yards to leeward it was certain to get away.
    Dowse assumed position next to Poulden and monitored closely the flutter at the edge of the main. It could so easily change to the