MESON Chess Problem Database

Problem Display
PID: 209096 (8/7Q/1p1N1K2/2k5/1N6/8/1P6/8 w - - 0 1)

Ernst, Erich

Badische Neueste Nachrichten, 1988

8/7Q/1p1N1K2/2k5/1N6/8/1P6/8

#2

5 + 2

5454 Near Snap 2020
15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd6
      • 2.Qe7#
  • Tries
    • 1.Qc2+?
      • 1...Kd4
        • 2.Sf5#
        • 2.Qf2#
        • 2.Qc3#
      • 1...Kxd6
        • 2.Qc6#
      • 1...Kxb4!
    • 1.Qd3?
      • 1...Kxb4
        • 2.Qb5#
        • 2.Qa3#
      • 1...b5!
    • 1.Qe4?
      • 1...Kxd6
        • 2.Qc6#
        • 2.Qe7#
      • 1...b5!
    • 1.Qf5+?
      • 1...Kxb4
        • 2.Qb5#
      • 1...Kd4
        • 2.Sc2#
        • 2.Qf2#
        • 2.Qe5#
      • 1...Kxd6!
    • 1.Qh5+?
      • 1...Kxb4
        • 2.Qb5#
      • 1...Kd4
        • 2.Qe5#
      • 1...Kxd6!
    • 1.Qc7+?
      • 1...Kd4
        • 2.Qxb6#
        • 2.Qc3#
      • 1...Kxb4!
  • Keys
    • 1.Qa7!
      • 1...Kxb4
        • 2.Qa3#
      • 1...Kd4
        • 2.Qxb6#
      • 1...Kxd6
        • 2.Qe7#

Anticipated by 80435(1962)

This anticipates 77644(1988), 198435(1997)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT,XS(C)::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • Q(E);
      • Refutation
        • P(b);
    • Try
      • Q(E);
      • Refutation
        • P(b);
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT,XS(B)::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT,XS(B)::QAR1(E)
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(B)
  • Actual
    • Q(E);P_PINP(b)
    • Vars
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(B)::QAB1(E)
      • K(a);S_FLIGHT::QAB(E),XP(b)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(C)::QAB1(E)
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