MESON Chess Problem Database

Problem Display
PID: 233321 (7K/3Q1p2/6kp/8/8/5P2/8/7R w - - 0 1)

Neyndorff, Luke

Chess Life, 1985

7K/3Q1p2/6kp/8/8/5P2/8/7R

#2

4 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Qg7#
  • Tries
    • 1.Rg1+?
      • 1...Kh5
        • 2.Qh3#
        • 2.Qg4#
      • 1...Kf6!
    • 1.Qxf7+?
      • 1...Kg5
        • 2.Rh5#
      • 1...Kxf7!
    • 1.f4?
      • 1...Kf6
        • 2.Rxh6#
      • 1...f5
        • 2.Qe6#
        • 2.Qg7#
      • 1...f6
        • 2.Qh7#
      • 1...h5!
  • Keys
    • 1.Rh5!
      • threat
        • 2.Qf5#
      • 1...Kxh5
        • 2.Qg4#
      • 1...Kf6
        • 2.Qd6#
      • 1...f5
        • 2.Qxf5#
      • 1...f6
        • 2.Qe8#

Anticipated by 175474(1899)

This anticipates 183339(2018)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATE,SBLOCK::QAR1(C)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK,XP(c)
      • Vars
        • K(a);P-FLIGHT::R1(A)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • P(B);
      • Vars
        • K(a);P-FLIGHT::R(A),XP(b)
        • P(c);OGATE,SBLOCK::QAB1(C)
      • Refutation
        • P(b);
  • Actual
    • R(A);
    • Threat
      • QAB1(C)
    • Vars
      • K(a);S_FLIGHT,XR(A)::QAB1(C)
      • K(a);P-FLIGHT::QAR2(C)
      • P(c);::QAB1(C),XP(c)
      • P(c);OGATEB,SBLOCK::QAB(C)
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