MESON Chess Problem Database

Problem Display
PID: 42852 (7B/4pP2/5p2/8/5k1K/4R3/4R3/3B4 w - - 0 1)

Papic, Ljubisa

Problem (Zagreb), 1980

7B/4pP2/5p2/8/5k1K/4R3/4R3/3B4

#2

6 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Be5#
  • Tries
    • 1.f8Q?
      • 1...e5
        • 2.Qxf6#
      • 1...f5
        • 2.Be5#
        • 2.Qh6#
      • 1...e6
        • 2.Qxf6#
      • 1...Kf5!
    • 1.f8R?
      • 1...e5
        • 2.Rxf6#
      • 1...f5
        • 2.Be5#
      • 1...e6
        • 2.Rxf6#
      • 1...Kf5!
  • Keys
    • 1.Re5!
      • threat
        • 2.R2e4#
      • 1...Kf3
        • 2.Rf5#
      • 1...fxe5
        • 2.f8Q#
        • 2.f8R#
      • 1...f5
        • 2.Rf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE,SBLOCK::B(F)
  • Tries
    • Try
      • P(E);P_PINP(b)
      • Vars
        • P(c);N_GUARD::QAR2(E),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(E);P_PINP(b)
      • Vars
        • P(c);N_GUARD::R(E),XP(b)
        • P(b);OGATE::B(F)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(C);
    • Threat
      • R1(B)
    • Vars
      • K(a);P-FLIGHT::R(C)
      • P(b);XR(C)::P=Q
      • P(b);::R(B)
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