MESON Chess Problem Database

Problem Display
PID: 258947 (rbN1Q2K/pk6/N1pp4/P7/R2P2B1/8/8/8 w - - 0 1)

Hjelle, David

Die Schwalbe, 1967

rbN1Q2K/pk6/N1pp4/P7/R2P2B1/8/8/8

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa6
      • 2.Qxc6#
    • 1...c5
      • 2.Qb5#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Qxc6#
      • 1...Kc7
        • 2.Qd7#
        • 2.Qe7#
      • 1...c5
        • 2.Qc6#
      • 1...Bc7!
    • 1.Sc5+?
      • 1...Kc7
        • 2.Qd7#
        • 2.Qe7#
      • 1...dxc5!
    • 1.Sxd6+?
      • 1...Kxa6
        • 2.Be2#
        • 2.Bc8#
        • 2.Qxc6#
        • 2.Qe2#
        • 2.Qc8#
      • 1...Bxd6!
    • 1.Se7?
      • threat
        • 2.Bc8#
        • 2.Qxc6#
        • 2.Qc8#
      • 1...Kxa6
        • 2.Qxc6#
      • 1...c5
        • 2.Bc8#
        • 2.Qb5#
        • 2.Qc6#
        • 2.Qc8#
      • 1...Bc7!
    • 1.Rc4?
      • threat
        • 2.Qxc6#
      • 1...c5
        • 2.Qb5#
      • 1...Kxa6!
    • 1.Qd7+?
      • 1...Kxa6
        • 2.Be2#
        • 2.Qxc6#
      • 1...Bc7!
    • 1.Qf7+?
      • 1...Kxa6
        • 2.Be2#
      • 1...Bc7!
    • 1.Qe2?
      • threat
        • 2.Rb4#
      • 1...c5
        • 2.Qb5#
      • 1...Bc7!
    • 1.Qe7+?
      • 1...Kxa6
        • 2.Be2#
      • 1...Bc7!
  • Keys
    • 1.d5!
      • threat
        • 2.Qxc6#
      • 1...Kxa6
        • 2.Qxc6#
      • 1...cxd5
        • 2.Qb5#
      • 1...c5
        • 2.Qb5#
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(d);N_GUARD,S_FLIGHT,XS(E)::QAR2(G),XP(a)
    • P(a);OGATE::QAR2(G)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAB1(G),XP(a)
      • Vars
        • P(a);::QAB1(G)
      • Refutation
        • B(f);
    • Try
      • S(E);CHECK
      • Refutation
        • P(b);XS(E)
    • Try
      • S(F);CHECK,XP(b)
      • Refutation
        • B(f);P_PINQ(G),XS(F)
    • Try
      • S(F);
      • Threat
        • DUALS(3)
      • Vars
        • K(d);S_FLIGHT,XS(E)::QAR2(G),XP(a)
      • Refutation
        • B(f);P_PINQ(G)
    • Try
      • R(A);
      • Threat
        • QAB1(G),XP(a)
      • Vars
        • P(a);OGATE::QAR2(G)
      • Refutation
        • K(d);S_FLIGHT,XS(E)
    • Try
      • Q(G);CHECK
      • Refutation
        • B(f);P_PINS(F),P_SPINB(f)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_GUARD,S_CUTB(f),S_FLIGHT,XS(E)::B(C)
      • Refutation
        • B(f);P_PINS(F),P_SPINB(f)
    • Try
      • Q(G);
      • Threat
        • R(A)
      • Vars
        • P(a);N_GUARD::QAR2(G)
      • Refutation
        • B(f);P_PINS(F)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_GUARD,S_CUTB(f),S_FLIGHT,XS(E)::B(C)
      • Refutation
        • B(f);P_PINS(F),P_SPINB(f)
  • Actual
    • P(B);
    • Threat
      • QAB1(G),XP(a)
    • Vars
      • K(d);S_FLIGHT,XS(E)::QAR2(G),XP(a)
      • P(a);OGATE,XP(B)::QAR2(G)
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