MESON Chess Problem Database

Problem Display
PID: 178764 (3Q4/7k/5K2/5p2/3n4/8/8/8 w - - 0 1)

Froberg, Johan Hilding Laurentius

Springaren, 1984

3Q4/7k/5K2/5p2/3n4/8/8/8

#2

2 + 3

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kh6
      • 2.Qh8#
  • Tries
    • 1.Kf7?
      • threat
        • 2.Qh4#
      • 1...Kh6
        • 2.Qh4#
      • 1...Sf3!
    • 1.Qe7+?
      • 1...Kg8
        • 2.Qg7#
      • 1...Kh8
        • 2.Qg7#
      • 1...Kh6!
    • 1.Qd7+?
      • 1...Kg8
        • 2.Qg7#
      • 1...Kh8
        • 2.Qg7#
      • 1...Kh6!
    • 1.Qg8+?
      • 1...Kh6
        • 2.Qg6#
        • 2.Qh8#
      • 1...Kxg8!
  • Keys
    • 1.Qc7+!
      • 1...Kh6
        • 2.Qh2#
      • 1...Kg8
        • 2.Qg7#
      • 1...Kh8
        • 2.Qg7#

Anticipated by 99666(1925)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • QAR(B)
      • Vars
        • K(c);P-FLIGHT::QAR2(B)
      • Refutation
        • S(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B)
        • K(c);P-FLIGHT::QAB1(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B)
        • K(c);P-FLIGHT::QAB1(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);CHECK
    • Vars
      • K(c);P-FLIGHT::QAR(B)
      • K(c);S_FLIGHT::QAR1(B)
      • K(c);P-FLIGHT::QAB1(B)
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