MESON Chess Problem Database

Problem Display
PID: 264431 (1N6/3Q4/pp1P4/1B1Pp3/1k1pR3/8/1KP5/6B1 w - - 0 1)

Quack, Godfrey C

The Problemist, 1992

1N6/3Q4/pp1P4/1B1Pp3/1k1pR3/8/1KP5/6B1

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...a5
      • 2.Sa6#
  • Tries
    • 1.Bxd4?
      • threat
        • 2.Bxb6#
      • 1...Ka5
        • 2.Bc3#
      • 1...exd4!
    • 1.Bxa6?
      • threat
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...b5
        • 2.Qxb5#
      • 1...Kc5!
    • 1.Rxd4+?
      • 1...Ka5
        • 2.Ra4#
      • 1...Kc5
        • 2.Sxa6#
        • 2.Qc6#
      • 1...exd4!
    • 1.c3+?
      • 1...Kc5
        • 2.Qc6#
      • 1...Ka5!
  • Keys
    • 1.c4!
      • 1...Ka5
        • 2.Sc6#
      • 1...Kc5
        • 2.Sxa6#
      • 1...axb5
        • 2.Qxb5#
      • 1...d3
        • 2.Sc6#
      • 1...a5
        • 2.Sa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(d);SBLOCK::S(I)
  • Tries
    • Try
      • B(A);XP(b)
      • Threat
        • R(D)+B(A),XP(e)
      • Vars
        • K(a);N_GUARD,S_FLIGHT::B(A)
      • Refutation
        • P(c);P_SPINP(c),XB(A)
    • Try
      • B(E);XP(d)
      • Threat
        • QAR1(H)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAR1(H)
        • P(e);::QAR1(H),XP(e)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);CHECK,XP(b)
      • Vars
        • K(a);OGATE,S_FLIGHT::R1(D)
      • Refutation
        • P(c);XR(D)
    • Try
      • P(C);CHECK
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAR1(H)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
  • Actual
    • P(C);N_PINP(b)
    • Vars
      • K(a);N_GUARD,S_FLIGHT::S(I)
      • K(a);N_GUARD,P_SPINP(b),S_FLIGHT::S(I),XP(d)
      • P(d);OGATE,XB(E)::QAR1(H),XP(d)
      • P(b);::S(I)
      • P(d);SBLOCK::S(I)
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