Set:1...fxe3 2.Bxe3#,1...Rxe5 2.Rxe5#.

1.Rd3+? (A) Kc4 2.R ~ (d1-d2-d5-d6) #,1...Kb5!

1.Re4+? (B) Kd5 2.Qc4#,1...Kc6!

1.d8Q? (2.Qd4#),1...Bd5 2.Qxd5#,1...Qd6 2.Qxd6#,1...Bc4! (a),

1.Sa7? (2.Qb5#),1...Qc6! (b),

(1.e6? -2.Re5#,1...Rd5!).

1.Sc7! (2.Qb5#),

1...Bc4 (a) 2.Rd3# (A),1...Qc6 (b) 2.Re4# (B).

Seneca theme.Radical change in three phases.Refutations become thematic defenses in solution.Black King's cross.