External engine references (ideas only)

Scraped JS — correctness oracle

Path	Role
`web/src/lib/gameLogic.js`	Perft oracle, move labels, wall rules

Repo: _vendor/pavlosdais-quoridor (clone of github.com/pavlosdais/Quoridor)
Protocol: quoridor.di.uoa.gr QTP — playmove, playwall, genmove
Move gen: src/generate_moves.c — unrolled pawn jumps + wall loops
Walls: wallAbove / wallBelow / wallOnTheRight / wallOnTheLeft in src/utilities.c
Search: αβ + iterative deepening + Zobrist TT (src/engine.c, zobrist_hashing.c)
Path: BFS (src/bfs.c) for eval and wall legality
No perft — we built our own; wall helpers confirm lateral geometry

Repo: _vendor/quoridor-mcts — github.com/gorisanson/quoridor-ai
Role: Secondary perft oracle (benchmark/lib/gorisanson_moves.mjs — full legal moves, not MCTS probable-wall subset)
Agrees with scraped JS + Rust at perft depth 3: 2_062_264 nodes (standard gate)
Search: guided MCTS (2.5k–60k rollouts/move on website) — different from our αβ plan

Project	Link	Notes
Zoridor	ringtailsoftware/zoridor	Zig CLI + web; traditional board in terminal
quoridor.js	OyvindSabo/quoridor.js	`getUnicodeRepresentation()`
tui-quoridor	tripasect/tui-quoridor	Python TUI

Our bench reporter: benchmark/lib/terminal_board.mjs (compact pawn grid).

agausmann/perftree — divide diff vs Stockfish
Our benchmark/perft_diff.mjs is the Quoridor equivalent (JS oracle instead of Stockfish)