The answer is SHEER The corresponding square is house puzzle by Brian Tivol The transcript is of a game of Ataxx. ("Colony" and "Gorgon" are two of the opponents from the arcade version of this game.) At five points in the game, the loser gets down to exactly one piece. When this happens, the winner's pieces are in the shape of a letter: __XXXX_ X__O__X XXXXXX_ XXXXXX_ XXXXXX_ _X_____ X_____X X______ X______ X_____X _X____O X_____X X_____O X______ X_____X __XXX__ XXXXXXX XXXX___ XXXXX_O XXXXXX_ _____X_ X_____X X______ X______ X___X__ _____X_ X_____X X______ X______ X__O_X_ _XXXX__ X_____X XXXXXX_ XXXXXX_ X_____X