MESON Chess Problem Database

Problem Display
PID: 142996 (3B4/1Prp4/3k4/N2P4/K2PP3/8/8/8 w - - 0 1)

Francey, James

Source?, 0000

3B4/1Prp4/3k4/N2P4/K2PP3/8/8/8

#2

7 + 3

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4+
      • 2.Sxc4#
    • 1...Rxb7
      • 2.Sc4#
      • 2.Sxb7#
    • 1...Rc8
      • 2.bxc8S#
  • Tries
    • 1.b8S?
      • 1...Rc4+
        • 2.Sxc4#
      • 1...Rc1
        • 2.Sb7#
      • 1...Rc2
        • 2.Sb7#
      • 1...Rc3
        • 2.Sb7#
      • 1...Rc5
        • 2.Sb7#
      • 1...Rc6
        • 2.Sb7#
      • 1...Rb7
        • 2.Sc4#
        • 2.Sxb7#
      • 1...Rc8
        • 2.Sb7#
      • 1...Ra7!
  • Keys
    • 1.b8R!
      • 1...Rc4+
        • 2.Sxc4#
      • 1...Rc1
        • 2.Sb7#
      • 1...Rc2
        • 2.Sb7#
      • 1...Rc3
        • 2.Sb7#
      • 1...Rc5
        • 2.Sb7#
      • 1...Rc6
        • 2.Sb7#
      • 1...Ra7
        • 2.Rb6#
      • 1...Rb7
        • 2.Sc4#
        • 2.Sxb7#
      • 1...Rc8
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(b);CHECK,N_GUARD::S(D),XR(b)
    • R(b);OGATE::PXR(b)=S
  • Tries
    • Try
      • P(F);
      • Vars
        • R(b);CHECK,N_GUARD::S(D),XR(b)
        • R(b);N_GUARD::S(D)
      • Refutation
        • R(b);P_PINS(D)
  • Actual
    • P(F);
    • Vars
      • R(b);CHECK,N_GUARD::S(D),XR(b)
      • R(b);N_GUARD::S(D)
      • R(b);N_GUARD,P_PINS(D)::R(F)
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