scrabble: single-word rule requires in-line connection #3

2026-06-14T12:40:14Z

developer commented

2026-06-14 12:40:14 +00:00

Under PlayOptions.IgnoreCrossWords a play connected to the board through any perpendicular contact, even one forming a non-word, because connected() reused the standard rule's touchesPerpendicular test while cross-words were suppressed. An all-new word that merely abutted the board sideways was accepted, and the generator (relaxed cross-sets) offered such plays.

Fix: under IgnoreCrossWords the main word must run through an existing tile along the play direction (len(Main) > len(Tiles)); generated moves are filtered by the same predicate so generation agrees with ValidatePlayOpts. Standard rules are unchanged (the brute-force oracle test still passes).

Consumed by scrabble-game as the single-word-per-turn fix; pinned there as v1.1.1 after merge.

Tests: go test ./... green; gofmt/go vet clean.

Under `PlayOptions.IgnoreCrossWords` a play connected to the board through any perpendicular contact, even one forming a non-word, because `connected()` reused the standard rule's `touchesPerpendicular` test while cross-words were suppressed. An all-new word that merely abutted the board sideways was accepted, and the generator (relaxed cross-sets) offered such plays. **Fix:** under `IgnoreCrossWords` the main word must run through an existing tile along the play direction (`len(Main) > len(Tiles)`); generated moves are filtered by the same predicate so generation agrees with `ValidatePlayOpts`. Standard rules are unchanged (the brute-force oracle test still passes). Consumed by scrabble-game as the single-word-per-turn fix; pinned there as `v1.1.1` after merge. Tests: `go test ./...` green; `gofmt`/`go vet` clean.

developer added 1 commit 2026-06-14 12:40:14 +00:00

scrabble: single-word rule requires in-line connection d70bd35470

Under PlayOptions.IgnoreCrossWords a play connected to the board through any
perpendicular contact, even one forming a non-word, because connected() reused
the standard rule's touchesPerpendicular test while cross-words were suppressed.
That let an all-new word merely abut the board sideways and be accepted, and the
generator, with relaxed cross-sets, offered such plays.

Require the main word to run through an existing tile along the play direction
when cross-words are ignored, and filter generated moves by the same predicate so
generation agrees with ValidatePlayOpts. Standard rules are unchanged.

owner approved these changes 2026-06-14 12:45:19 +00:00

developer merged commit bf48d3c915 into master

2026-06-14 12:46:10 +00:00

developer deleted branch feature/single-word-connectivity

2026-06-14 12:46:10 +00:00

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Reference: developer/scrabble-solver#3