MESON Chess Problem Database

Problem Display
PID: 240444 (8/Q7/4N3/1K1RpR2/4k3/8/8/8 w - - 0 1)

Parkhomenko, Nikolai A

Source?, 1968

8/Q7/4N3/1K1RpR2/4k3/8/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sg5+?
      • 1...Kxd5
        • 2.Qc5#
        • 2.Qd7#
      • 1...Kxf5!
    • 1.Rf4+?
      • 1...Kxd5
        • 2.Qd7#
      • 1...exf4!
    • 1.Qb6?
      • 1...Kxd5
        • 2.Qc6#
      • 1...Kxf5!
    • 1.Qb8?
      • threat
        • 2.Qxe5#
      • 1...Ke3
        • 2.Qxe5#
      • 1...Kxd5
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Kxf5!
    • 1.Qa1?
      • threat
        • 2.Qxe5#
      • 1...Ke3
        • 2.Qxe5#
        • 2.Qe1#
      • 1...Kxd5
        • 2.Qxe5#
      • 1...Kxf5!
    • 1.Qc7?
      • threat
        • 2.Qxe5#
      • 1...Ke3
        • 2.Qxe5#
      • 1...Kxd5
        • 2.Rxe5#
        • 2.Qxe5#
        • 2.Qc6#
      • 1...Kxf5!
    • 1.Qd7?
      • threat
        • 2.Rdxe5#
      • 1...Ke3
        • 2.Rdxe5#
      • 1...Kxf5!
    • 1.Qf7?
      • threat
        • 2.Rfxe5#
      • 1...Ke3
        • 2.Rfxe5#
      • 1...Kxd5!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxe5#
      • 1...Ke3
        • 2.Qxe5#
      • 1...Kxd5
        • 2.Qxe5#
      • 1...Kxf5
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • R(C);CHECK
      • Vars
        • K(a);S_FLIGHT,XR(B)::QAR2(E)
      • Refutation
        • P(b);XR(C)
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,P_SPINP(b),S_FLIGHT,XR(B)::QAB1(E)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR2(E),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • K(a);P_SPINP(b),S_FLIGHT,XR(B)::QAR1(E),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR2(E),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(E);
      • Threat
        • R1(B),XP(b)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(E);
      • Threat
        • R1(C),XP(b)
      • Vars
        • K(a);P-FLIGHT::R(C),XP(b)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(B)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E),XP(b)
    • Vars
      • K(a);P-FLIGHT::QAR2(E),XP(b)
      • K(a);P_SPINP(b),S_FLIGHT,XR(B)::QAR1(E),XP(b)
      • K(a);P_SPINP(b),S_FLIGHT,XR(C)::R1(B),XP(b)
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