MESON Chess Problem Database

Problem Display
PID: 146961 (r4k2/2P3R1/8/5N2/8/8/8/5Q1K w - - 0 1)

Malik, Y

5th HM., Lokker MT, 1987

r4k2/2P3R1/8/5N2/8/8/8/5Q1K

#2

5 + 2

145 StrateGems 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Ke8
      • 2.Sd6#
    • 1...Ra1
      • 2.c8Q#
      • 2.c8R#
    • 1...Ra2
      • 2.c8Q#
      • 2.c8R#
    • 1...Ra3
      • 2.c8Q#
      • 2.c8R#
    • 1...Ra4
      • 2.c8Q#
      • 2.c8R#
    • 1...Ra5
      • 2.c8Q#
      • 2.c8R#
    • 1...Ra6
      • 2.c8Q#
      • 2.c8R#
    • 1...Ra7
      • 2.c8Q#
      • 2.c8R#
    • 1...Rb8
      • 2.cxb8Q#
      • 2.cxb8R#
    • 1...Rd8
      • 2.cxd8Q#
      • 2.cxd8R#
  • Tries
    • 1.Se3+?
      • 1...Ke8
        • 2.Qf7#
      • 1...Kxg7!
    • 1.Sg3+?
      • 1...Ke8
        • 2.Qf7#
      • 1...Kxg7!
    • 1.Sd4+?
      • 1...Ke8
        • 2.Qf7#
      • 1...Kxg7!
    • 1.Sh4+?
      • 1...Ke8
        • 2.Qf7#
      • 1...Kxg7!
    • 1.Sh6+?
      • 1...Ke8
        • 2.Qf7#
      • 1...Kxg7!
    • 1.Qh3?
      • threat
        • 2.Qh8#
      • 1...Ke8
        • 2.Qh8#
      • 1...Ra1+!
    • 1.Qc4?
      • threat
        • 2.Rg8#
        • 2.Qf7#
        • 2.Qg8#
      • 1...Ke8
        • 2.Qf7#
        • 2.Qg8#
      • 1...Ra1+!
    • 1.Qe1?
      • threat
        • 2.Qe7#
      • 1...Ra1
        • 2.c8Q#
        • 2.c8R#
      • 1...Re8!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qxa8#
      • 1...Ke8
        • 2.Qxa8#
      • 1...Rxa6
        • 2.c8Q#
        • 2.c8R#
      • 1...Rc8
        • 2.Qxc8#
      • 1...Ra7
        • 2.Qc8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Re8
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::S(C)
    • R(a);N_GUARD,P_PINQ(A)::P=Q
    • R(a);N_GUARD::P=Q
    • R(a);OGATE::PXR(a)=Q
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(b);P-FLIGHT::QAR(A)
      • Refutation
        • R(a);CHECK
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Refutation
        • R(a);CHECK
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • R(a);N_GUARD,P_PINQ(A)::P=Q
      • Refutation
        • R(a);
  • Actual
    • Q(A);
    • Threat
      • QAR(A),XR(a)
    • Vars
      • K(b);P-FLIGHT::QAR(A),XR(a)
      • R(a);N_GUARD,XQ(A)::P=Q
      • R(a);N_GUARD::QAR(A),XR(a)
      • R(a);OGATE::PXR(a)=Q
      • R(a);SBLOCK::QAR2(A)
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