Boundary Five

Original15×15 Renju adaptation with a casual forced-center opening. Black wins exactly five; White wins five or more. Black overline, double-four and true double-three lose unless the same move wins an exact-five. True threes require recursively legal straight-four continuations; two ends of one four count once, separate fours in one direction count twice. Red preview warns before separate placement. After three stones, two successive passes draw; full board draws. No tournament opening/swap/fifth-stone procedure.

One human versus a same-rule threat-aware bot, exact local and online two humans. Native intersection board and bounded black/white stones, separate48pxcontrols, legal hint, zoom/panning, solo Undo, original audio, English/PT Help/rematch.

Public replay-validated online history,60-second turn forfeit, acknowledged casual host-managed result. Departure/background/deadlines abort without result; no reconnect/migration. Portrait preferred; landscape supported.

Portrait preferred, landscape supported. Touch selects an intersection, then separate Place confirms. Red previews warn forbidden Black moves which lose if confirmed. Arrows/WASD select, release F/Enter places, H hints, P passes after the first three stones.48pxcursor/Place/Hint/Zoom/Pass below board. Solo Undo, sound/mute, English/PT Help/rematch. Exact local2/online2 humans; sixty-second online turn forfeit, live Help, departure safely aborts; casual/unverified, no reconnect.