FA-97783 / Knitting and sewing pattern grading / Member archive

Top-down raglan setup: increase round count · case 03

The yoke stops one round short of the underarm width.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

neck_sts < 16 -> "error: neck too small". Reserve 4 raglan seam stitches; rem = neck-4; front = rem//3; sleeves share rem - 2*front, each sleeve half of that, and an odd leftover goes to the back (back = front + leftover%2). Each increase round adds 2 to front (and back); rounds = max(0, ceiling((underarm_body_sts//2 - front)/2)). yoke_total = neck + 8*rounds.

Why this case matters

Top-down raglan sweaters split the neck cast-on among front, back, sleeves and seam stitches.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: increase round count	`{"back": 35, "front": 35, "increase_rounds": 2, "raglan": 4, "sleeve": 18, "yoke_total": 126}`	`{"back": 35, "front": 35, "increase_rounds": 3, "raglan": 4, "sleeve": 18, "yoke_total": 134}`	Failed

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