2ae2c8013cf754efc2fd8897098780d63b9f4026
Adds a null-valued entry under a valid square key (d3) to the 'keeps valid entries and drops invalid ones' fixture, proving the typeof/null guard branch in deserializePhantoms is exercised. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Web-based two-player chess where each player sees only their own pieces; the server is the moderator.
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