FA-82965 / Go territory scoring / Member archive

Even-sized boards receive side and centre handicap stones · case 05

A 10x10 board with 5+ handicap gets off-centre "tengen" stones.

Member previewVariant 5 · 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 6	`[[2, 9], [9, 2], [9, 9], [2, 2], [6, 2], [6, 9]]`	`[]`	Failed

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