MESON Chess Problem Database

Problem Display
PID: 47763 (8/4Q3/8/8/4p3/3RpN2/4k3/2R3K1 w - - 0 1)

Neyndorff, Luke

StrateGems, 2003

8/4Q3/8/8/4p3/3RpN2/4k3/2R3K1

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...exf3
      • 2.Qxe3#
  • Tries
    • 1.Rd2+?
      • 1...exd2
        • 2.Qxe4#
      • 1...Kxf3!
    • 1.Ra3?
      • 1...exf3
        • 2.Qxe3#
      • 1...Kxf3!
    • 1.Rb3?
      • 1...exf3
        • 2.Qxe3#
      • 1...Kxf3!
    • 1.Rdc3?
      • 1...exf3
        • 2.Qxe3#
      • 1...Kxf3!
    • 1.Qf6?
      • 1...Kxd3
        • 2.Qa6#
      • 1...exd3
        • 2.Re1#
      • 1...exf3!
    • 1.Qf7?
      • 1...Kxd3
        • 2.Qc4#
      • 1...exd3
        • 2.Re1#
      • 1...exf3!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Rxe3#
        • 2.Qxe3#
      • 1...Kxd3
        • 2.Qb5#
      • 1...Kxf3
        • 2.Rxe3#
      • 1...exd3
        • 2.Qg2#
      • 1...exf3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATE,P_SPINP(b),XS(D)::QAR1(E),XP(b)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • P(b);P_SPINP(c),XR(C)::QAR2(E),XP(c)
      • Refutation
        • K(a);S_FLIGHT,XS(D)
    • Try
      • R(C);
      • Vars
        • P(c);OGATE,P_SPINP(b),XS(D)::QAR1(E),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XS(D)
    • Try
      • R(C);
      • Vars
        • P(c);OGATE,P_SPINP(b),XS(D)::QAR1(E),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XS(D)
    • Try
      • R(C);
      • Vars
        • P(c);OGATE,P_SPINP(b),XS(D)::QAR1(E),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XS(D)
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(C)::QAB(E)
        • P(c);SBLOCK,XR(C)::R1(A)
      • Refutation
        • P(c);XS(D)
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(C)::QAB1(E)
        • P(c);SBLOCK,XR(C)::R1(A)
      • Refutation
        • P(c);XS(D)
  • Actual
    • Q(E);
    • Threat
      • DUALS(2)
    • Vars
      • K(a);OGATEB,S_FLIGHT,XR(C)::QAB(E)
      • K(a);P_SPINP(b),S_FLIGHT,XS(D)::R1(C),XP(b)
      • P(c);SBLOCK,XR(C)::QAR2(E)
      • P(c);XS(D)::QAR1(E),XP(b)
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