MESON Chess Problem Database

Problem Display
PID: 95547 (1N1r4/k1P4R/1Np5/8/7r/1Q1p4/3K2b1/8 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Rostocker Zeitung, 1911

1N1r4/k1P4R/1Np5/8/7r/1Q1p4/3K2b1/8

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kb7
      • 2.c8Q#
    • 1...Ra4
      • 2.cxd8Q#
      • 2.cxd8R#
    • 1...Rb4
      • 2.cxd8Q#
    • 1...Rc4
      • 2.cxd8Q#
      • 2.cxd8R#
  • Tries
    • 1.Qa2+?
      • 1...Kb7
        • 2.Qa6#
      • 1...Ra4
        • 2.cxd8Q#
      • 1...Kxb6!
    • 1.Qa4+?
      • 1...Kb7
        • 2.Qa6#
      • 1...Rxa4
        • 2.cxd8Q#
      • 1...Kxb6!
    • 1.Qa3+?
      • 1...Kb7
        • 2.Qa6#
      • 1...Ra4
        • 2.cxd8Q#
      • 1...Kxb6!
    • 1.Qb5?
      • threat
        • 2.Qa6#
      • 1...Kb7
        • 2.Qa6#
        • 2.c8Q#
      • 1...Rxb8
        • 2.c8S#
      • 1...Ra4
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...cxb5!
    • 1.cxd8S+?
      • 1...Kxb8
        • 2.Rb7#
      • 1...Rxh7!
    • 1.c8Q+?
      • 1...Rd7
        • 2.Rxd7#
      • 1...Rxh7!
    • 1.c8R+?
      • 1...Rd7
        • 2.Rxd7#
      • 1...Rxh7!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qa6#
      • 1...Kxb6
        • 2.cxd8Q#
        • 2.cxd8B#
      • 1...Kb7
        • 2.Qa6#
      • 1...Rxc4
        • 2.cxd8Q#
      • 1...Rxb8
        • 2.c8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(e);P-FLIGHT::P=Q
    • R(c);N_GUARD::PXR(f)=Q
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB1(B)
        • R(c);P_SPINR(c)::PXR(f)=Q
      • Refutation
        • K(e);S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB1(B)
        • R(c);XQ(B)::PXR(f)=Q
      • Refutation
        • K(e);S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB1(B)
        • R(c);P_SPINR(c)::PXR(f)=Q
      • Refutation
        • K(e);S_FLIGHT,XS(C)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • R(f);N_GUARD,SBLOCK,XS(F)::P=S
        • R(c);N_GUARD::PXR(f)=Q
      • Refutation
        • P(d);XQ(B)
    • Try
      • P(D);CHECK,XR(f)
      • Vars
        • K(e);S_FLIGHT,XS(F)::R1(E)
      • Refutation
        • R(c);XR(E)
    • Try
      • P(D);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(E),XR(f)
      • Refutation
        • R(c);XR(E)
    • Try
      • P(D);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(E),XR(f)
      • Refutation
        • R(c);XR(E)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(e);S_FLIGHT,XS(C)::PXR(f)=Q
      • K(e);P-FLIGHT::QAB1(B)
      • R(c);N_GUARD,XQ(B)::PXR(f)=Q
      • R(f);N_GUARD,SBLOCK,XS(F)::P=S
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