MESON Chess Problem Database

Problem Display
PID: 221482 (1n2KN2/3p4/7R/4k3/3pp2P/4Np2/5P2/3Q4 w - - 0 1)

Koder, Gabor

Suomen Shakki, 1976

1n2KN2/3p4/7R/4k3/3pp2P/4Np2/5P2/3Q4

#2

7 + 6

15148 Sadier Collection 2020
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Sg6#
  • Tries
    • 1.Sxd7+?
      • 1...Kf4
        • 2.Rf6#
      • 1...Sxd7!
    • 1.Rh5+?
      • 1...Kf4
        • 2.Sg6#
        • 2.Rf5#
      • 1...Kf6
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Re6+?
      • 1...Kf4
        • 2.Sg6#
      • 1...dxe6!
    • 1.Qxd4+?
      • 1...Kf4
        • 2.Sg6#
        • 2.Rf6#
        • 2.Qf6#
        • 2.Qd6#
      • 1...Kxd4!
  • Keys
    • 1.Rf6!
      • 1...Kxf6
        • 2.Qxd4#
      • 1...dxe3
        • 2.Qd6#
      • 1...d3
        • 2.Qa1#
      • 1...Sa6
        • 2.Sxd7#
      • 1...Sc6
        • 2.Sxd7#
      • 1...d5
        • 2.Sg4#
      • 1...d6
        • 2.Rf5#

This anticipates 267713(1976)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • K(d);S_FLIGHT::S(G)
  • Tries
    • Try
      • S(G);CHECK,XP(e)
      • Vars
        • K(d);S_FLIGHT::R(E)
      • Refutation
        • S(f);XS(G)
    • Try
      • R(E);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB(A),XP(b)
      • Refutation
        • K(d);P_SPINP(b),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(d);S_FLIGHT::S(G)
      • Refutation
        • P(e);XR(E)
    • Try
      • Q(A);CHECK,XP(b)
      • Refutation
        • K(d);S_FLIGHT,XQ(A)
  • Actual
    • R(E);
    • Vars
      • K(d);S_FLIGHT,XR(E)::QAB(A),XP(b)
      • P(b);OGATE,XS(C)::QAB1(A)
      • P(b);OGATEB::QAB(A)
      • S(f);N_GUARD::S(G),XP(e)
      • P(e);SBLOCK::S(C)
      • P(e);SBLOCK::R1(E)
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