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Kai-oi Strategy and Tips

Here is how to think about winning at Kai-oi, split into short lessons. Each one reads on its own, and each one comes with a real position: press Try it on the board and you play the move yourself.

Look near the shell tip

Lesson 1

Start at the pointed top, called the shell tip. Look immediately beside it on the drawn shell and notice where a dark line divides. Comparing a small area is easier than trying to remember the entire shell at once.

Tap a ground shell to point at it with a hand. Compare it in its original place until you press Check. Compare the thickness of the bands and the way their branches spread. The two halves face opposite ways, so matching patterns may appear as reflections rather than pointing in the same direction.

Try several candidates before committing. Changing your selection does not add a try. Once the markings near the tip look promising, check the edge bands and overall outline as well, then press Check. Check places the shells side by side; the result appears 3 seconds later.

Compare bands around the edge

Lesson 2

Follow the bands along the lower edge of the drawn shell. Notice whether the outermost band is pale or dark and whether the next band is broad or narrow. A sequence of bands gives you more to compare than one color alone.

Choose a ground shell to mark it with a hand in its original place. Follow both lower edges from the middle toward the ends. Look for a band that widens, narrows, or crosses another marking. Remember that the two halves face opposite ways: a feature at one end may correspond to the other end.

Lighting can make matching colors look slightly different. Check the order and width of the bands, then compare the pointed top and overall shape before pressing Check. You may change your choice as often as you need. Check places the shells side by side; the result appears 3 seconds later.

Compare size and shape

Lesson 3

All shell photographs use the same scale. A larger real shell therefore looks larger on the board. First compare the balance between width and height: is the drawn shell broad and shallow, or rounder and fuller? A very different outline is a useful reason to inspect another candidate.

Tap a ground shell to mark it with a hand and compare it in place. Notice whether the pointed top sits near the middle or toward one end. Follow the lower curve and the shapes of the two ends. Since the halves face opposite ways, compare the right side of one with the left side of the other.

Use size to narrow your search, then check edge bands and fine lines. Several shells may have similar widths. Choosing a different shell moves only the hand; the game judges your choice when you press Check. Check places the shells side by side; the result appears 3 seconds later.

Find fine lines on pale shells

Lesson 4

Pale shells can look very similar because their broad markings are faint. Look for fine lines spreading from the pointed top toward the lower edge. Instead of following only one line, notice the spacing between nearby lines and any place where a line branches.

Choose a ground shell to point at it with a hand in its original place. Follow the lines from top to bottom and compare areas where they are crowded or widely spaced. The two halves have opposite orientations, so a reversed slope can still belong to a matching pair.

Some fine lines may be hard to see because of the lighting. Return to the edge bands and overall outline when that happens. Compare several ground shells before committing, then press Check when both shape and markings seem close. Check places the shells side by side; the result appears 3 seconds later.

Try it on the board

Pick a lesson and the board starts from that position. Start over as often as you like.

Now put it to work

Play with friendsLearn how to play (3 min)

Last updated 2026-11-11 · Run by Qdan, Inc.