MESON Chess Problem Database

Problem Display
PID: 86880 (8/2K4B/5P2/3pk3/4N3/4Q3/8/8 w - - 0 1)

Gerasimenko, Nikolai Mikhailovich

Problemista, 1966

8/2K4B/5P2/3pk3/4N3/4Q3/8/8

#2

5 + 2

6490 yacpdb 2009
5454 Near Snap 2017

SOLUTION

  • SOUND
  • Tries
    • 1.Kd7?
      • 1...d4
        • 2.Qg5#
      • 1...dxe4!
    • 1.Qc5?
      • 1...Ke6
        • 2.Qe7#
      • 1...Kf4!
    • 1.Qg5+?
      • 1...Ke6
        • 2.Bg8#
      • 1...Kd4!
    • 1.Qb6?
      • 1...dxe4
        • 2.Qd6#
      • 1...d4
        • 2.Qd6#
      • 1...Kf4!
    • 1.Qc3+?
      • 1...Kf4
        • 2.Qg3#
      • 1...Ke6
        • 2.Sg5#
      • 1...d4!
    • 1.Qg3+?
      • 1...Kd4
        • 2.Qc3#
      • 1...Ke6!
    • 1.Qh3?
      • 1...Kd4
        • 2.Qc3#
      • 1...Kf4
        • 2.Qg3#
      • 1...d4
        • 2.Qf5#
      • 1...dxe4!
  • Keys
    • 1.Qa3!
      • 1...Kd4
        • 2.Qc3#
      • 1...Kf4
        • 2.Qg3#
      • 1...Ke6
        • 2.Qe7#
      • 1...dxe4
        • 2.Qd6#
      • 1...d4
        • 2.Qd6#

This anticipates 46436(1986), 196658(1995), 200707(2017)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • P(a);SBLOCK::QAR2(A)
      • Refutation
        • P(a);P_SPINP(a),XS(B)
    • Try
      • Q(A);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::B(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(a);XS(B)::QAB1(A)
        • P(a);::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • K(b);P-FLIGHT::S(B)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • P(a);SBLOCK::QAR1(A)
      • Refutation
        • P(a);XS(B)
  • Actual
    • Q(A);
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • K(b);P-FLIGHT::QAR1(A)
      • P(a);XS(B)::QAB1(A)
      • P(a);::QAB1(A)
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