MESON Chess Problem Database

Problem Display
PID: 234683 (k7/1bRP1K1Q/2R5/8/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2010

k7/1bRP1K1Q/2R5/8/8/8/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc6
      • 2.Qg8#
      • 2.Qh8#
      • 2.d8Q#
      • 2.d8R#
    • 1...Bc8
      • 2.dxc8Q#
      • 2.dxc8R#
  • Tries
    • 1.Qg8+?
      • 1...Bc8
        • 2.Qxc8#
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Ka7!
    • 1.Qh8+?
      • 1...Bc8
        • 2.Qxc8#
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Ka7!
    • 1.d8Q+?
      • 1...Bc8
        • 2.Qxc8#
      • 1...Ka7!
    • 1.d8R+?
      • 1...Bc8
        • 2.Rdxc8#
      • 1...Ka7!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxb7#
      • 1...Kb8
        • 2.Qxb7#
      • 1...Bxc6
        • 2.d8Q#
        • 2.d8R#
      • 1...Ba6
        • 2.Rxa6#
      • 1...Bc8
        • 2.dxc8Q#
        • 2.dxc8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);OGATE::PXB(a)=Q
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • K(b);P-FLIGHT,P_SPINB(a)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(b);P-FLIGHT,P_SPINB(a)
    • Try
      • P(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR2(C),XB(a)
      • Refutation
        • K(b);P-FLIGHT,P_SPINB(a)
    • Try
      • P(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R(C),XB(a)
      • Refutation
        • K(b);P-FLIGHT,P_SPINB(a)
  • Actual
    • Q(E);
    • Threat
      • QAB1(E),XB(a)
    • Vars
      • K(b);P-FLIGHT,P_SPINB(a)::QAR1(E),XB(a)
      • B(a);N_GUARD,XR(A)::P=Q
      • B(a);N_GUARD::R(A),XB(a)
      • B(a);OGATE::PXB(a)=Q
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