darksquares.net's rivals
Provides progressive blindfold chess training across seven levels from square recognition to full games.
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takestakes.comnobody's claimed it
Chess vision trainer to spot every attack on the board for both players.
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 darksquares.net. 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.