MESON Chess Problem Database

Problem Display
PID: 39095 (K4RN1/2pp4/ppk5/2b1Qp2/P3p3/1N5B/4n3/8 w - - 0 1)

Ling, John Francis

The Problemist, 1966

K4RN1/2pp4/ppk5/2b1Qp2/P3p3/1N5B/4n3/8

#2

7 + 9

136 Problem Observer 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Se7#
    • 1...Bf2
      • 2.Se7#
    • 1...Be3
      • 2.Se7#
    • 1...Bd4
      • 2.Se7#
    • 1...Be7
      • 2.Sxe7#
    • 1...b5
      • 2.Qxc5#
  • Tries
    • 1.Sd4+?
      • 1...Bxd4
        • 2.Se7#
      • 1...Sxd4!
    • 1.Rf6+?
      • 1...Bd6
        • 2.Se7#
      • 1...d6!
    • 1.Qe6+?
      • 1...Bd6
        • 2.Se7#
      • 1...d6
        • 2.Se7#
      • 1...dxe6!
  • Keys
    • 1.Qxf5!
      • threat
        • 2.Qxd7#
      • 1...Kd6
        • 2.Rf6#
      • 1...b5
        • 2.Qxc5#
      • 1...Bd6
        • 2.Qxe4#
      • 1...d5
        • 2.Qd7#
      • 1...d6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(c);N_GUARD::S(G)
    • B(c);N_GUARD::S(G),XB(c)
    • P(f);N_GUARD::QAR1(D),XB(c)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • B(c);XS(A)::S(G)
      • Refutation
        • S(a);XS(A)
    • Try
      • R(F);CHECK
      • Vars
        • B(c);P_SPINB(c)::S(G)
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • Q(D);CHECK
      • Vars
        • B(c);P_SPINB(c)::S(G)
        • P(i);P_SPINP(i)::S(G)
      • Refutation
        • P(i);XQ(D)
  • Actual
    • Q(D);XP(d)
    • Threat
      • QAB1(D),XP(i)
    • Vars
      • K(g);P-FLIGHT::R(F)
      • P(f);N_GUARD::QAR1(D),XB(c)
      • B(c);SBLOCK,S_CUTP(i)::QAB(D),XP(b)
      • P(i);::QAB1(D)
      • P(i);SBLOCK,S_CUTB(c)::S(G)
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