makes sense to share a mutable object like a counter between threads,
If you want to try it
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Шанхайские Драконы，更多细节参见谷歌
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The ordering is critical and was a source of subtle bugs: \pushstate must be called after \makemove (which populates the \save@* registers) but before \updategamestate (which modifies them). Reverse for unmake: \popstate first, then \unmakemove. Getting this wrong produces moves that look almost right but occasionally corrupt castling rights or en passant state (the kind of bug that shows up once every 50 games).。关于这个话题，官网提供了深入分析