MESON Chess Problem Database

Problem Display
PID: 46280 (8/6Q1/4p3/8/6p1/8/6k1/R3K2R w QK - 0 1)

Froberg, Johan Hilding Laurentius

Problemnoter, 1965

8/6Q1/4p3/8/6p1/8/6k1/R3K2R

#2

4 + 3

4883 Still More Fun with Chess Miniatures 2002
136 Problem Observer 2019

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.Qb7#
  • Tries
    • 1.Ke2?
      • threat
        • 2.Rag1#
        • 2.Qxg4#
      • 1...g3
        • 2.Rag1#
        • 2.Qb7#
      • 1...Kg3!
    • 1.Rh3?
      • threat
        • 2.Qxg4#
      • 1...Kg1
        • 2.Qxg4#
      • 1...g3
        • 2.Qxg3#
      • 1...Kxh3!
    • 1.Qb2+?
      • 1...Kxh1
        • 2.0-0-0#
      • 1...Kg3
        • 2.Qf2#
      • 1...Kf3!
  • Keys
    • 1.Qe5!
      • 1...Kxh1
        • 2.Kf2#
      • 1...Kf3
        • 2.0-0#
      • 1...g3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAB(D)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);
      • Threat
        • QAR2(D),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR(D),XP(b)
        • P(b);OGATE::QAR1(D),XP(b)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(D);CHECK,N_PINP(b)
      • Vars
        • K(a);S_FLIGHT,XR(C)::0-0-0
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(D);N_PINP(b)
    • Vars
      • K(a);S_FLIGHT,XR(C)::R(A)+K(B)
      • K(a);S_FLIGHT::0-0
      • P(b);SBLOCK::QAB(D)
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