MESON Chess Problem Database

Problem Display
PID: 121223 (8/N1K5/8/2kp4/2p3Q1/7R/8/8 w - - 0 1)

Parkhomenko, Nikolai A

Sahovski Glasnik, 1987

8/N1K5/8/2kp4/2p3Q1/7R/8/8

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Rxc3#
  • Tries
    • 1.Sc6?
      • 1...d4
        • 2.Rh5#
        • 2.Qf5#
        • 2.Qh5#
        • 2.Qg5#
      • 1...c3
        • 2.Qb4#
      • 1...Kb5!
    • 1.Qf3?
      • 1...Kb4
        • 2.Qa3#
      • 1...Kd4
        • 2.Qe3#
      • 1...c3
        • 2.Qxc3#
      • 1...d4!
    • 1.Qf4?
      • 1...d4
        • 2.Qd6#
      • 1...c3
        • 2.Rxc3#
      • 1...Kb4!
  • Keys
    • 1.Qg3!
      • 1...Kb4
        • 2.Qa3#
      • 1...Kd4
        • 2.Qe3#
      • 1...c3
        • 2.Qxc3#
      • 1...d4
        • 2.Qd6#

Anticipated by 2215(0000), 249589(1894)

This anticipates 158225(1999)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::R(A),XP(a)
  • Tries
    • Try
      • S(C);
      • Vars
        • P(a);OGATE::QAB1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Vars
        • P(c);::QAB1(B)
        • P(a);OGATEB::R(A),XP(a)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • P(a);OGATEB::QAR2(B),XP(a)
      • P(c);::QAB1(B)
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