Shogi4 (4x4 shogi): validated strong-solution engine for the public-domain 4×4 drop-shogi. Rules recovered from the official Android package; 2.1B-position reduced solve; full distributed solve designed and calibrated, not run.
rust shogi dobutsu-shogi game-solving retrograde-analysis endgame-tablebase shogi-variant shogi4 4x4-shogi drop-shogi
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Updated
Jun 9, 2026 - Python