Imports github.com/go-redis/redis/v8 github.com/notnil/chess github.com/notnil/chess/opening github.com/razzie/chessimage github.com/razzie/jsonrpc golang.org/x/net/websocket Standard library imports context crypto/rand fmt html/template image image/color image/draw image/gif io io/fs log math/rand net/http net/url strconv strings sync time