A Signifies Column of Attack. S ” Column of Support. M ” Column of Manoeuvre. + ” Advantage in Position. - ” Disadvantage in Position. = ” Equality in Position. The positional values of the several Prime Strategetic Factors are obtained as follows: COLUMN OF ATTACK That Column of Attack which is posted upon the superior Strategic front as compared to the front occupied by the immediately opposing formation (cf, Grand Tactics, pp. 117 to 275), has the advantage in position. This relative advantage and disadvantage in position of the Column of Attack is expressed by the first term of the Strategic Syllogism, viz.: (I.) +A ---- -A or (II.) -A ----- +A In the first instance (I), the White Column of Attack has the advantage and the Black formation has the disadvantage; in the second case (II), this condition is reversed. COLUMN OF SUPPORT A Column of Support has the superiority in position, as compared with the adverse Column of Support, whenever it contains more than the latter of the following advantages, viz.: I. One, or more, Passed Pawns. II. Two united Pawns, overlapping an adverse Pawn. III. Two isolated Pawns adjacent to a single adverse Pawn. IV. Three, or more, united Pawns at their fifth squares, opposed by a like number of adverse Pawns posted on their Normal Base Line. V. A majority of kindred Pawns on that side of the Board farthest from the adverse King. The relative advantage and disadvantage of one Column of Support, over the opposing Column of Support, is expressed by the second term of the Strategic Syllogism, thus: (I.) +S ---- -S or (II.) -S ----- +S In the first case (I), White has the advantage and Black has the disadvantage. In the second case (II), this condition is reversed. COLUMN OF MANOEUVRE Columns of Manoeuvre are not compared with each other. The advantage of one over another is determined by comparing their respective powers of resistance to the attack of the corresponding adverse Columns of Support. That Column of Manoeuvre which longest can debar the adverse promotable Factors from occupying a point of junction on the kindred Strategetic Rear, has the advantage. The relative advantage and disadvantage of the column of Manoeuvre is expressed by the third term of the Strategic Syllogism, viz.: (I.) +M ---- -M or (II.) -M ----- +M In the first case (I), White, has the advantage and Black the disadvantage. In the second case (II), this condition is reversed. In recording the values of the opposing Prime Strategetic Factors, the terms relating to White are written above and those relating to Black, below the line.