4dchess.org's rivals
Play four-dimensional chess online with puzzles, tournaments, and analysis tools.
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abstractboardgames.comnobody's claimed it
Offers free online play of abstract strategy games like Hex, Connect6, Amazons, Breakthrough, and Tumbleweed. Players can challenge friends or the computer AI.
How rivals are picked
Every square's description is compared with every other square's, and the closest thirty are read by an AI that keeps only real alternatives: products a customer would weigh against 4dchess.org. Add-ons, companion apps and neighbouring niches are left out. It reads what each site says about itself, so it can be wrong; tell us when it is.
Bulldozing costs what evicting costs: double what the owner paid, $1 minimum. It's anonymous, nobody moves in, and the lot reopens at $1, so they can come back. The longer version is evict your competitor.