Two horse chestnuts, both drilled and hardened, both on a string. One is a pleasure to play with, the other whips out of your hand and takes a knuckle with it. The difference is almost never the conker. It is the string, the knot, and the length you agreed to before anyone started swinging.

Get the setup right and the game looks after itself. Get it wrong and you spend more time re-threading than playing, or arguing about whether that last hit counted. Here is how to do it properly.

Agree the rules before you thread anything

Fairness in conkers starts as a conversation, not a knot. Two players turning up with wildly different strings is the most common source of trouble: one conker dangling near the knees, the other up by the elbow, and no useful way to compare results.

Before the first swing, settle three things out loud. How long the string will be. How the conker has been prepared, if it has been prepared at all. And what counts as a hit — a clean strike from a hanging conker, or anything that touches. Write nothing down, but say it clearly, because a rule nobody remembers is a rule nobody follows.

Opinions differ on hardening conkers with vinegar, slow baking, or storing them through the winter. Those are questions of fairness, not safety, and traditions vary by village, school and family. Do whatever your group agrees on, but do it before the string goes on, not halfway through a match.

Choosing the right string

A good conker string is thin enough to pass through a drilled hole, thick enough not to slice into fingers, and stiff enough to stay out of its own way. Waxed cotton cord and braided polyester both work well at around 2–3 mm. Leather laces are traditional and kind to the hands, though they stretch with use. Thin paracord is fine if you cut it cleanly and melt the ends.

What to avoid: fishing line, wire, string that has frayed into spikes, and old elastic. Anything that stretches will lengthen during play, which quietly turns your fair 20 cm into 28 cm by the third round. Anything sharp will cut hands. Anything that has been on a garden fence for two years will snap at the worst moment.

Threading the conker

Drill through the centre of the conker, along the axis that runs from the flat face to the rounded top. A skewer, a thin nail or a small hand drill all work. Aim for a hole slightly wider than your cord so the string runs freely, but not so wide that the knot pulls through.

  1. Pierce the conker first with a pin or skewer to mark the line, then widen the hole with your drill or nail. Going slowly reduces splitting.
  2. Cut a length of cord roughly twice as long as you think you need — you can always shorten it.
  3. Push the cord through the hole from the flat underside, so it exits at the top where the shoot once was.
  4. Tie your stopper knot tight against the underside. It should sit flush, not dangle.
  5. Form a loop at the other end for your hand, or leave a long tail to knot later once you have measured.
  6. Trim the loose ends and seal them if the cord is synthetic, so the string does not unravel mid-game.

If the cord keeps slipping out, your stopper knot is too small. If the conker hangs at an ugly angle, you drilled off-centre; start again with a fresh one rather than fighting it.

Knots that hold under load

You need two knots and no more. Underneath the conker, an overhand knot or a doubled overhand will sit against the shell and stop the string pulling through. For extra bulk, a figure-eight knot gives a wider, flatter stopper. Keep it snug to the conker, because a loose knot lets the shell rattle up and down the cord.

At the hand end, a simple loop is enough. A bowline holds firmly and unties easily; a slip knot lets you adjust length but can tighten around a knuckle when a hard hit lands. If you tie a slip knot, leave a generous tail so you always have something to grab.

Test every knot by hanging the conker and pulling hard, twice, before you hand it to anyone. A knot that slides on the first swing is worse than no knot at all.

Getting the length right

There is no single worldwide standard, which is exactly why you agree it locally. Traditional schoolyard practice measures the string from the knuckles of the fist down to the top of the conker. A workable default for mixed ages is a string that hangs roughly the length of the player's hand span — for most children, somewhere near 20 cm. Many organised games settle on a similar figure, but check before you assume.

Two practical adjustments matter more than the exact number. First, measure the same way for both players — from knuckle to conker, not from wrist to the knot. Second, measure after the string has been stretched and the stopper knot has settled, since both shorten the working length.

If one string is noticeably longer, the player with the short string has to lean in, which makes clean hits harder and accidental clashes more likely. That is not a skill difference; it is a setup difference. Trim and re-thread before you play.

A quick fair-play checklist

  • Both strings measured the same way, from the same reference point.
  • Both conkers hung so they sit clear of the knuckles, not touching the hand.
  • Stopper knots flush against the shell on both sides.
  • No stretching elastic, no frayed cord, no repaired knots with tape.
  • Any hardening method declared before play, not during.
  • Agreed rules on what counts as a hit and how a miss is called.

Safety on the swing

Set up so the whole game happens below chest height. The aim is the opponent's conker, never the opponent. Players stand at roughly arm's length, feet planted, and the striking player swings downward rather than sideways, which keeps stray conkers away from faces and ears.

Keep spectators at least a few paces back and well out of the arc. Check the cord before each game for fraying, especially near the knots, and retire any string that is visibly worn. If a conker shatters, stop and clear the pieces and any loose fragments of shell from the ground before carrying on. This is ordinary common sense rather than a formal safety code, and it applies to every game with a swinging object and hard pieces involved.

The two-minute setup

Cut a cord about twice the finished length. Drill through the conker, thread from the flat side, and tie a doubled overhand tight against the shell. Loop the other end, adjust until the conker hangs just clear of your knuckles, then measure both strings side by side before the first swing. Pull each knot hard, check the cord for damage, and agree the rules out loud.

That is the whole job. Do it once, properly, and the conker does the rest — or it does not, which is the other half of the fun.

Photo: karishea / Pixabay