MESON Chess Problem Database

Problem Display
PID: 234739 (4K3/3p4/4k3/1R6/5P1n/8/2Q5/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2013

4K3/3p4/4k3/1R6/5P1n/8/2Q5/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg2
      • 2.Qg6#
    • 1...Sf3
      • 2.Qg6#
    • 1...Sg6
      • 2.Qxg6#
    • 1...d5
      • 2.Rb6#
  • Tries
    • 1.Re5+?
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf6!
    • 1.Qf5+?
      • 1...Kd6
        • 2.Qxd7#
      • 1...Sxf5!
    • 1.Qc4+?
      • 1...Kd6
        • 2.Rb6#
      • 1...Kf6
        • 2.Qf7#
      • 1...d5!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qe7#
      • 1...Kd6
        • 2.Qxd7#
      • 1...Kf6
        • 2.Qf7#
      • 1...Sf5
        • 2.Qg6#
      • 1...Sg6
        • 2.Qxg6#
      • 1...d5
        • 2.Rb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::QAR2(A)
    • S(a);N_GUARD::QAR2(A),XS(a)
    • P(c);N_GUARD,SBLOCK::R(C)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(A),XP(c)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(C)
        • K(b);OGATE,P-FLIGHT::QAR1(A)
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(b);P-FLIGHT::QAR1(A),XP(c)
      • K(b);P-FLIGHT::QAR1(A)
      • S(a);N_GUARD::QAR2(A)
      • S(a);N_GUARD::QAR2(A),XS(a)
      • P(c);N_GUARD,SBLOCK::R(C)
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