Player 1 places vertical dominoes; player 2 places horizontal ones. The player who cannot place loses (except in Quelhas).

Inventor: Göran Andersson

See BoardGameGeek: Stop-Gate and, for Quelhas, Quelhas (PDF).

6×6 through 12×12.

Misère; players drop longer 1×N bars.

• Current engine version: 20260425 (2026-04-25). On Abstract Play since 2026-05-13.

• https://boardgamegeek.com/boardgame/7450/stop-gate
• https://jpneto.github.io/world_abstract_games/modern_rules/2025_Quelhas.pdf