Nº26 Eduard Eilazyan

Draw

Eduard Eilazyan (Ukraine)

wKb7,Qf2,Bc8,Pa2,b2,b6,e4/bKg8,Qf3,Bh1,Nc6,Pf5,h2

1.Be6+!
Logical try: 1.Qxh2? Qxe4 2.Bxf5 Na5+! False Refutation: 2…Nd8+? 3.Kc8! Qxf5+ 4.Kxd8=. 3.Ka6 Qa8+ 4.Kb5 Bc6+ 5.Kb4 Qf8+ 6.Kxa5 Qc5+ 7.Ka6 Qc4+ 8.Ka7 Qf7+! (Logical try in the refutation: 8…Qxa2+? 9.Kb8 Qa8+ 10.Kc7 Qb7+ 11.Kd8=) 9.Bd7 (9.Qc7? Qxa2+ 10.Kb8 Qa8#) 9…Qxa2+ 10.Kb8 Qa8+ 11.Kc7 Qb7+ 12.Kd6 (12.Kd8 Qxd7#) 12…Qb8+ 13.Kxc6 Qxh2–+.

A) Main variant: 1…Kg7 2.Qxh2!
Try-1: 2.Qh4? Nd8+! 3.Ka7 Nxe6! 4.Qe7+ Kh8! 5.Qf6+ Kh7! 6.Qe7+ Ng7!–+.

2…Qxe4 3.Bxf5 Na5+
3…Nd8+ 4.Kc8! Qxf5+ 5.Kxd8=.

4.Ka6 Qa8+ 5.Kb5 Bc6+ 6.Kb4! Qf8+ 7.Kxa5 Qc5+ 8.Ka6 Qc4+ 9.Ka7 Qxa2+
9…Qf7+? 10.Qc7!+-.

10.Kb8 Qa8+ 11.Kc7 Qb7+ 12.Kd8!=.
12.Kd6? Qb8+ 13.Kxc6 Qxh2–+.

B) Additional variant: 1…Kf8 2.Qh4! Change of try (see Try-1 in Main variant)
Try-2: 2.Qxh2? Qxe4! 3.Bxf5 (3.Qd6+ Ne7+! 4.Kc7 Qb7+! 5.Kd8 Bc6! 6.Qc7 Qa8+!–+) 3…Nd8+! False Refutation: 3…Na5+? 4.Ka6! Qa8+ 5.Kb5=. Change of False Refutation (see False Refutation in the Logical Try).4.Kc7 Qe7+! 5.Kc8 Bb7+! 6.Kb8 Nc6# model mate.(or 4.Kc8 Qa8+! 5.Kc7 Nf7! 6.Bc8 Qc6+! 7.Kb8 Qxb6+! 8.Bb7 Qxb7#)

2…fxe4!= e.g. 3.Bb3 Na5+ 4.Ka7 Nc6+ 5.Kb7=.

Theme: A logical study with a synthesis of two themes of change: the change of try and the change of false refutation.