MESON Chess Problem Database

Problem Display
PID: 234724 (4k3/2K1n3/8/8/8/1Q6/4RrR1/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2013

4k3/2K1n3/8/8/8/1Q6/4RrR1/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rf7
      • 2.Qb8#
  • Tries
    • 1.Rg7?
      • threat
        • 2.Qb8#
      • 1...Rxe2
        • 2.Qf7#
      • 1...Kf8!
    • 1.Qa3?
      • threat
        • 2.Qxe7#
      • 1...Kf7
        • 2.Qxe7#
      • 1...Kf8
        • 2.Qxe7#
      • 1...Rf7
        • 2.Qa8#
      • 1...Rxe2!
    • 1.Qb4?
      • threat
        • 2.Qxe7#
      • 1...Kf7
        • 2.Qxe7#
      • 1...Kf8
        • 2.Qxe7#
      • 1...Rf7
        • 2.Qb8#
      • 1...Rxe2!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qxe7#
      • 1...Kf8
        • 2.Qxe7#
      • 1...Rxe2
        • 2.Rg8#
      • 1...Rf7
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK::QAR(C)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAR(C)
      • Vars
        • R(a);N_GUARD,N_SPINS(b),XR(A)::QAB1(C)
      • Refutation
        • K(c);N_SPINS(b),P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XS(b)
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::QAR1(C),XS(b)
        • K(c);P-FLIGHT::QAB1(C),XS(b)
        • R(a);SBLOCK::QAR(C)
      • Refutation
        • R(a);N_SPINS(b),XR(A)
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XS(b)
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::QAR1(C),XS(b)
        • K(c);P-FLIGHT::QAB1(C),XS(b)
        • R(a);SBLOCK::QAR(C)
      • Refutation
        • R(a);N_SPINS(b),XR(A)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XS(b)
    • Vars
      • K(c);N_SPINS(b),P-FLIGHT::QAB1(C),XS(b)
      • R(a);N_GUARD,XR(A)::R(B)
      • R(a);SBLOCK::QAR2(C)
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