MESON Chess Problem Database

Problem Display
PID: 10890 (6Q1/4K3/2N5/1k6/N7/8/2P5/8 w - - 0 1)

Speckmann, Werner

Problemas, 1969

6Q1/4K3/2N5/1k6/N7/8/2P5/8

#2

5 + 1

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa4
      • 2.Qb3#
  • Tries
    • 1.Kd6?
      • 1...Kxa4
        • 2.Qb3#
      • 1...Ka6!
    • 1.Kd7?
      • 1...Kxa4
        • 2.Qb3#
      • 1...Ka6!
    • 1.Qb3+?
      • 1...Ka6
        • 2.Sc5#
        • 2.Qb6#
      • 1...Kxc6!
    • 1.Qd5+?
      • 1...Kxa4
        • 2.Qb3#
        • 2.Qa5#
      • 1...Ka6!
    • 1.Qe6?
      • 1...Kxa4
        • 2.Qb3#
      • 1...Ka6!
    • 1.Qg4?
      • 1...Kxc6
        • 2.Qd7#
      • 1...Ka6!
    • 1.Qb8+?
      • 1...Kxa4
        • 2.Qb3#
        • 2.Qb4#
      • 1...Kc4
        • 2.Qb3#
      • 1...Ka6
        • 2.Sc5#
        • 2.Qb6#
      • 1...Kxc6!
    • 1.Qc8?
      • 1...Kxa4
        • 2.Qa6#
      • 1...Kc4!
    • 1.c4+?
      • 1...Ka6
        • 2.Qa8#
        • 2.Qc8#
      • 1...Kxc6
        • 2.Qc8#
      • 1...Kxa4!
  • Keys
    • 1.Qd8!
      • 1...Kxa4
        • 2.Qa5#
      • 1...Kc4
        • 2.Qd3#
      • 1...Ka6
        • 2.Qb6#
      • 1...Kxc6
        • 2.Qd7#

Anticipated by 76024(1923), 169941(1945), 22405(1969)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT,XS(B)::QAB1(E)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • K(a);S_FLIGHT,XS(B)::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(a);S_FLIGHT,XS(B)::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT,XS(B)::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT,XS(B)::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(A);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(C)::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT,XS(B)
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT,XS(B)::QAR1(E)
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);S_FLIGHT::QAR1(E)
      • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
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