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  3. Deprecation of pnacl

Hey developers, I don't know whether or not you all know this, but PNACL and NACL are being phased out in 2018. I know that this is what Lichess uses for local computer analysis. More details:

Lichess has a WebAssembly version of Stockfish already (it's used in Firefox). All it needs is for WebAssembly to support multiple threads, which should hopefully happen some time before the PNACL phase-out.

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