MESON Chess Problem Database

Problem Display
PID: 194171 (8/8/8/5NkN/8/5K2/7Q/8 w - - 0 1)

Janet, Frank

Pittsburgh Sun, 1917

8/8/8/5NkN/8/5K2/7Q/8

#2

4 + 1

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Ke4?
      • 1...Kg4
        • 2.Qh4#
      • 1...Kg6!
    • 1.Qg1+?
      • 1...Kxh5
        • 2.Qg4#
      • 1...Kxf5!
    • 1.Qg3+?
      • 1...Kxh5
        • 2.Qg4#
      • 1...Kxf5!
    • 1.Qf4+?
      • 1...Kxh5
        • 2.Qh6#
        • 2.Qg4#
      • 1...Kg6!
    • 1.Qg2+?
      • 1...Kxh5
        • 2.Qg4#
      • 1...Kxf5!
    • 1.Qh4+?
      • 1...Kxf5
        • 2.Qf6#
      • 1...Kg6!
  • Keys
    • 1.Qd6!
      • 1...Kxf5
        • 2.Qf6#
      • 1...Kxh5
        • 2.Qh6#

Anticipated by 4617(1884)

This anticipates 119959(1924), 71679(2006)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT,XS(D)::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT,XS(D)::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT,XS(D)::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XS(C)::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);P-FLIGHT,XS(C)::QAR1(A)
      • K(a);P-FLIGHT,XS(D)::QAR1(A)
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