Rename
- server/database/ → server/lobby/ (17 import sites + qualified references)
- Package was named "database" but there is no database — it's in-memory
hashmaps for players/rooms/spectators. "lobby" accurately names its role:
the multiplayer game lobby state (who is in what room, joining/leaving,
spectating).
Ratel-online legacy cleanup
- Delete server/README.md — 100% Chinese, entirely about ratel card games
(斗地主/跑得快/德州扑克/麻将/骗子酒馆/Uno). Zero relevance to gomoku.
- Delete server/build.sh + server/build.ps1 — multi-platform ratel-server
build scripts with mixed Chinese comments, superseded by Makefile +
Dockerfile.
- Delete server/docs/ — Chinese Docker deployment guide + quickstart,
superseded by root docs/deployment-guide.md and root README.md.
- Delete server/demo.gif — ratel card-game demo screenshot.
Comment fixes: update "database" references in consts/const.go and
game/board.go package docs to point at "lobby" instead.
go vet + go test ./... green.
Port GomokuAI.java to Go with three difficulty levels:
- Easy: uniform random (seeded RNG for determinism)
- Medium: immediate win/block heuristic from caro
- Hard: true minimax depth-3 with alpha-beta pruning
evaluatePosition uses caro threat-pattern weights (open-four=100000,
closed-four=10000, open-three=1000, etc.) as leaf evaluator.
candidateMoves limits branching to radius-2 Chebyshev neighbours.
Benchmark: ~71µs/move on 30-stone mid-game board (budget: <1s).
Port Board.java and GomokuHelper.java to idiomatic Go under server/game/.
Board is a value type ([15][15]Piece) enabling zero-allocation Clone().
Helper provides ValidMoves, FormatBoard, WinnerMessage as pure functions.
Covers all 4 win directions, draw, OOB, occupied-cell, and reset cases.
tiennm99