Fat Fritz is not the Only Ripoff and now ChessBase is Getting Sued
There are a few things wrong with Stockfish's claims. Here's an analysis from yesterday: https://news.ycombinator.com/item?id=279008871. It's legal to sell Stockfish -- to "rip it off" -- as long as you're compliant with GPL v3: https://opensource.stackexchange.com/questions/4753/is-it-le...2. Fat Fritz seems compliant with GPL v3. They've released their code.3. Stockfish claims they haven't released their NN weights. But that claim makes no sense. They distribute the weights with every copy of Fat Fritz. Otherwise, the product wouldn't work.4. Stockfish can't unilaterally terminate someone's license to the code. GPL allows people to remedy violations, and Fat Fritz did. Saying "They didn't release their NN weights" doesn't seem to be true, and they almost seem to be hinging their entire case on this one point.