MESON Chess Problem Database

Problem Display
PID: 233327 (4b1kq/3p1R1N/3K1pP1/5p2/5B2/6Q1/8/8 w - - 0 1)

Neyndorff, Luke

Chess Life, 1989

4b1kq/3p1R1N/3K1pP1/5p2/5B2/6Q1/8/8

#2

6 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qb3?
      • 1...Bxf7
        • 2.Qxf7#
      • 1...Qg7
        • 2.Rf8#
      • 1...Qxh7!
  • Keys
    • 1.g7!
      • 1...Kxf7
        • 2.gxh8S#
      • 1...Kxh7
        • 2.g8Q#
        • 2.g8B#
      • 1...Qxg7
        • 2.Qxg7#
      • 1...Qxh7
        • 2.Rf8#
      • 1...Bxf7
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Vars
        • B(d);OGATE,P_SPINB(d),XR(E)::QAB1(A),XB(d)
        • Q(f);SBLOCK::QAB(A)+R(E),DCHECK
      • Refutation
        • Q(f);XS(F)
  • Actual
    • P(D);
    • Vars
      • K(e);S_FLIGHT,XR(E)::PXQ(f)=S
      • K(e);OGATE,S_FLIGHT,XS(F)::P=Q
      • Q(f);OGATE,P_SPINQ(f),XP(D)::QAR1(A),XQ(f)
      • Q(f);SBLOCK,XS(F)::R1(E)
      • B(d);SBLOCK,XR(E)::S(F),XP(b)
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