MESON Chess Problem Database

Problem Display
PID: 45950 (2b5/3B4/6rr/5qP1/6kp/5RPR/8/5QK1 w - - 0 1)

Vaughan, Colin V

The Problemist Supplement, 1999

2b5/3B4/6rr/5qP1/6kp/5RPR/8/5QK1

#2

7 + 6

56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...hxg3
      • 2.Rfxg3#
  • Tries
    • 1.Rxh4+?
      • 1...Kxg5
        • 2.Rxf5#
      • 1...Rxh4!
  • Keys
    • 1.Qc4+!
      • 1...Kxf3
        • 2.g4#
      • 1...Kxh3
        • 2.gxh4#
      • 1...Kxg5
        • 2.Rxf5#
      • 1...Kh5
        • 2.Qxh4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATE,XP(D)::R1(C),XP(b)
  • Tries
    • Try
      • R(E);CHECK,XP(b)
      • Vars
        • K(a);N_SPINQ(c),P-FLIGHT,XP(F)::R1(C),XQ(c)
      • Refutation
        • R(e);XR(E)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(a);N_SPINQ(c),OGATE,S_FLIGHT,XR(C)::R(E)+P(D)
      • K(a);S_FLIGHT,XR(E)::R(C)+P(D),XP(b)
      • K(a);N_SPINQ(c),P-FLIGHT,XP(F)::R1(C),XQ(c)
      • K(a);N_SPINQ(c),OGATE,P_SPINP(b),S_FLIGHT::QAR1(A),XP(b)
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