FA-82944 / Go territory scoring / Member archive

13x13 handicap stones land on the third line · case 04

Handicap on 13x13 uses 3-3 points instead of 4-4 points.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [size, count]. Star line e = 2 (0-based) below 13x13 else 3; f = size-1-e; mid = size//2. Counts outside 2..9 give []. Even boards allow at most 4. Order: [e,f],[f,e],[f,f],[e,e]; counts 6-9 add [mid,e],[mid,f]; 8-9 add [e,mid],[f,mid]; odd counts from 5 add the centre last.

Why this case matters

Go servers and scoring tools compute this value automatically; a wrong answer changes a game result.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
handicap placement case 7	`[[2, 10], [10, 2], [10, 10]]`	`[[3, 9], [9, 3], [9, 9]]`	Failed

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