MESON Chess Problem Database

Problem Display
PID: 261607 (8/7p/1p6/pNkN1R2/1R3pQ1/8/7b/7K w - - 0 1)

Junker, Karl

3rd Prize, Schweizerische Schachzeitung, 1978

8/7p/1p6/pNkN1R2/1R3pQ1/8/7b/7K

#2

6 + 6

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...f3
      • 2.Qc4#
  • Tries
    • 1.Sf6+?
      • 1...Kc6
        • 2.Qf3#
      • 1...Kxb4!
    • 1.Re5?
      • threat
        • 2.Qc8#
      • 1...Kc6
        • 2.Qc8#
      • 1...axb4!
    • 1.Rg5?
      • threat
        • 2.Qc8#
      • 1...Kc6
        • 2.Qc8#
      • 1...f3
        • 2.Qc4#
      • 1...axb4!
    • 1.Rh5?
      • threat
        • 2.Qc8#
      • 1...Kc6
        • 2.Qc8#
      • 1...f3
        • 2.Qc4#
      • 1...axb4!
    • 1.Qe2?
      • threat
        • 2.Qc4#
        • 2.Qc2#
      • 1...axb4
        • 2.Se7#
      • 1...Kc6!
    • 1.Qg2?
      • threat
        • 2.Qc2#
      • 1...axb4
        • 2.Se3#
      • 1...Kc6!
    • 1.Qg6?
      • threat
        • 2.Qxb6#
        • 2.Qd6#
      • 1...axb4
        • 2.Se3#
        • 2.Sxb6#
      • 1...f3
        • 2.Qxb6#
      • 1...hxg6!
    • 1.Qg7?
      • threat
        • 2.Qc3#
        • 2.Qc7#
      • 1...Kc6
        • 2.Qc7#
      • 1...f3
        • 2.Qc3#
      • 1...axb4!
    • 1.Qg8?
      • threat
        • 2.Qc8#
      • 1...Kc6
        • 2.Qc8#
      • 1...axb4
        • 2.Se7#
      • 1...f3!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qc3#
      • 1...Kc6
        • 2.Sf6#
      • 1...axb4
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATE::QAR1(C)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT::QAB(C)
      • Refutation
        • K(d);P_SPINP(b),S_FLIGHT,XR(B)
    • Try
      • R(F);
      • Threat
        • QAR(C)
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
      • Refutation
        • P(c);XR(B)
    • Try
      • R(F);
      • Threat
        • QAR(C)
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
        • P(b);OGATE::QAR1(C)
      • Refutation
        • P(c);XR(B)
    • Try
      • R(F);
      • Threat
        • QAR(C)
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
        • P(b);OGATE::QAR1(C)
      • Refutation
        • P(c);XR(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);SBLOCK,XR(B)::R(F)+S(E)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • P(c);SBLOCK,XR(B)::R(F)+S(E)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAB1(C),XP(e)
      • Refutation
        • P(f);XQ(C)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
        • P(b);::QAR2(C)
      • Refutation
        • P(c);XR(B)
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
        • P(c);SBLOCK,XR(B)::R(F)+S(E)
      • Refutation
        • P(b);
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(d);N_GUARD,P-FLIGHT::QAB(C)+S(E)
      • P(c);SBLOCK,XR(B)::R(F)+S(E)
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