MESON Chess Problem Database

Problem Display
PID: 234662 (4k3/4P2p/1K2Q1n1/2B5/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2008

4k3/4P2p/1K2Q1n1/2B5/8/8/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe7
      • 2.Qxe7#
    • 1...Sf8
      • 2.exf8Q#
      • 2.exf8R#
  • Tries
    • 1.Kc6?
      • 1...Sxe7+
        • 2.Qxe7#
      • 1...Sf4
        • 2.Qg8#
      • 1...Sh4
        • 2.Qg8#
      • 1...Sf8
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Sh8
        • 2.Qg8#
      • 1...h5
        • 2.Qxg6#
      • 1...h6
        • 2.Qxg6#
      • 1...Se5+!
    • 1.Qf7+?
      • 1...Kd7
        • 2.e8Q#
      • 1...Kxf7!
    • 1.Qg8+?
      • 1...Kd7
        • 2.e8Q#
      • 1...Sf8!
    • 1.Qxg6+?
      • 1...Kd7
        • 2.Qc6#
        • 2.e8Q#
      • 1...hxg6!
  • Keys
    • 1.Kc7!
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Sf4
        • 2.Qg8#
      • 1...Sh4
        • 2.Qg8#
      • 1...Se5
        • 2.Qg8#
      • 1...Sf8
        • 2.exf8Q#
        • 2.exf8S#
        • 2.exf8B#
        • 2.exf8R#
      • 1...Sh8
        • 2.Qg8#
      • 1...h5
        • 2.Qxg6#
      • 1...h6
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE,P_SPINS(a),XP(D)::QAR1(C),XS(a)
    • S(a);OGATE::PXS(a)=Q
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(a);CHECK,OGATE,P_SPINS(a),XP(D)::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR2(C)
        • S(a);OGATE::PXS(a)=Q
        • P(b);N_GUARD::QAB(C),XS(a)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::P=Q
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::P=Q
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(C);CHECK,XS(a)
      • Refutation
        • P(b);XQ(C)
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • S(a);OGATE,P_SPINS(a),XP(D)::QAR1(C),XS(a)
      • S(a);N_GUARD::QAR2(C)
      • P(b);N_GUARD::QAB(C),XS(a)
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