MESON Chess Problem Database

Problem Display
PID: 10480 (8/8/8/1p4K1/6p1/6Q1/4N3/1r5k w - - 0 1)

Froberg, Johan Hilding Laurentius

1st Prize, Borsodi Vegyesz, 1965

8/8/8/1p4K1/6p1/6Q1/4N3/1r5k

#2

3 + 4

3295 Einfuhrung in die Welt des Schachproblem 1984

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qxg1#
    • 1...Rb2
      • 2.Qg1#
    • 1...Rb3
      • 2.Qg1#
    • 1...Rb4
      • 2.Qg1#
  • Tries
    • 1.Kxg4?
      • threat
        • 2.Qh3#
      • 1...Rg1
        • 2.Qxg1#
      • 1...Rb3
        • 2.Qg1#
      • 1...Rb4+!
    • 1.Sf4?
      • threat
        • 2.Qg2#
      • 1...Rg1
        • 2.Qh4#
      • 1...Rb2!
    • 1.Qxg4?
      • threat
        • 2.Qh3#
      • 1...Rg1
        • 2.Qxg1#
      • 1...Rb3
        • 2.Qg1#
      • 1...Kh2!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Sg3#
      • 1...Rg1
        • 2.Qxg1#
      • 1...Rb3
        • 2.Qg1#
      • 1...g3
        • 2.Sxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::QAR1(B),XR(a)
    • R(a);N_GUARD::QAR1(B)
  • Tries
    • Try
      • K(C);P-FLIGHT,XP(c)
      • Threat
        • QAR2(B)
      • Vars
        • R(a);N_GUARD,P_PINQ(B)::QAR1(B),XR(a)
        • R(a);N_GUARD::QAR1(B)
      • Refutation
        • R(a);CHECK
    • Try
      • S(A);
      • Threat
        • QAB1(B)
      • Vars
        • R(a);SBLOCK::QAR(B)
      • Refutation
        • R(a);
    • Try
      • Q(B);XP(c)
      • Threat
        • QAR2(B)
      • Vars
        • R(a);N_GUARD,P_PINQ(B)::QAR1(B),XR(a)
        • R(a);N_GUARD::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • S(A)
    • Vars
      • R(a);N_GUARD::QAR1(B),XR(a)
      • R(a);N_GUARD::QAR1(B)
      • P(c);::S(A),XP(c)
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