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TacTurn V1.2 (rebuilt, internal 1.4.28) — replaces the earlier V1.2 build. The earlier V1.2 (net from internal 1.4.20) was a regression and its published Elo claims were wrong, because the test harness reported results with the sign flipped. Those claims are retracted. This build restores the original, verified net (Stockfish-labeled training) and includes the audited engine fixes and speedups of 1.4.23–1.4.28. No Lc0-trained net is included; Lc0 data experiments were rejected, with credits in the README. New bench: 165888. No CCRL rating is claimed.