MESON Chess Problem Database

Problem Display
PID: 214590 (7Q/8/8/P1N1p3/3k4/P3N3/8/4K3 w - - 0 1)

Rohner, William A

Adelaide Observer, 1878

7Q/8/8/P1N1p3/3k4/P3N3/8/4K3

#2

6 + 2

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qxe5#
  • Tries
    • 1.Ke2?
      • 1...Kc3
        • 2.Qxe5#
      • 1...Kxc5!
    • 1.Qd8+?
      • 1...Kc3
        • 2.Qd2#
      • 1...Kxc5
        • 2.Qb6#
        • 2.Qd5#
      • 1...Kxe3!
  • Keys
    • 1.Qf6!
      • 1...Kc3
        • 2.Qxe5#
      • 1...Kxe3
        • 2.Qf2#
      • 1...Kxc5
        • 2.Qb6#

Anticipated by 30870(1875)

This anticipates 222466(1883), 181844(1905)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB(F),XP(b)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);S_FLIGHT::QAB(F),XP(b)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT,XS(E)
    • Try
      • Q(F);CHECK,N_PINP(b)
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(F)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
  • Actual
    • Q(F);
    • Vars
      • K(a);S_FLIGHT::QAB(F),XP(b)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(C)::QAB1(F)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(E)::QAB1(F)
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