Battleship Arena: Five Admirals, One Grid

Abstract. Five Battleship admirals from OpenCompletion played a seeded round robin & solo clears on the random boards from the 2024 post. Pooled over every solo board played, an exact placement-density grid sinks a fleet in 45.7 ± 1.9 shots. Jev, TypeSafe's decision model, played a dozen ways on top of that grid & every one landed inside that interval or within a shot or two of it, including when offered all 100 positions, as long as each cell carried its placement count. Strip the counts & jev needs 78.9 ± 4.8, between Hunter (51.2) & Random (96.1). A chat model given the same board & the same six candidates scored 43.9 ± 1.9, also inside the noise, at three seconds per move against jev's 0.4. Building the arena also caught two shipped admirals playing as random. Final numbers Every algorithm, every solo board it played: the arena's forty boards, the trial's twenty, or both. Same algorithm under two names is one row (the grid alone is Super Human Hunter; fuse40 is the activity's Jev…