MESON Chess Problem Database

Problem Display
PID: 238953 (r7/p1P1P1Q1/N1Bk2n1/K1pP4/1R6/B1p4q/8/4r3 w - - 0 1)

Petite, Efren

Problemas, 1995

r7/p1P1P1Q1/N1Bk2n1/K1pP4/1R6/B1p4q/8/4r3

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.cxb8Q#
      • 2.cxb8B#
    • 1...cxb4
      • 2.Bxb4#
    • 1...c4
      • 2.Rb1#
      • 2.Rb2#
      • 2.Rb3#
      • 2.Ra4#
      • 2.Rxc4#
      • 2.Rb5#
      • 2.Rb6#
      • 2.Rb7#
      • 2.Rb8#
  • Tries
    • 1.Re4?
      • threat
        • 2.Bxc5#
      • 1...Qe3
        • 2.Qf6#
        • 2.Qxg6#
      • 1...Ra1!
    • 1.Rg4?
      • threat
        • 2.Bxc5#
      • 1...Ra1
        • 2.Qf6#
      • 1...Qe3!
  • Keys
    • 1.Rb8!
      • threat
        • 2.Bxc5#
      • 1...Qe3
        • 2.c8S#
      • 1...Ra1
        • 2.e8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(h);OGATE::PXR(h)=Q
    • P(d);OGATE,P_SPINP(d),XR(B)::B(A),XP(d)
  • Tries
    • Try
      • R(B);P_PINP(d)
      • Threat
        • B(A),XP(d)
      • Refutation
        • R(a);P_PINB(A)
    • Try
      • R(B);P_PINP(d)
      • Threat
        • B(A),XP(d)
      • Vars
        • R(a);N_GUARD,P_PINB(A)::QAR2(I)
      • Refutation
        • Q(c);
  • Actual
    • R(B);P_PINP(d)
    • Threat
      • B(A),XP(d)
    • Vars
      • Q(c);N_GUARD::P=S
      • R(a);N_GUARD,P_PINB(A)::P=S
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