MESON Chess Problem Database

Problem Display
PID: 148228 (q1n3nK/5BRp/4P2P/1RN1Nk1p/5P1B/r2PP3/7r/7b w - - 0 1)

Petite, Efren

Comm., Israel Ring Ty., 1985

q1n3nK/5BRp/4P2P/1RN1Nk1p/5P1B/r2PP3/7r/7b

#2

12 + 9

721 Variantim 1988

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Rg5#
  • Tries
    • 1.Scd7?
      • threat
        • 2.Rg5#
      • 1...Qg2
        • 2.Sf3#
      • 1...Rg2
        • 2.Sc6#
      • 1...Rxd3!
    • 1.Bxg8?
      • threat
        • 2.Bxh7#
        • 2.Rf7#
      • 1...Rxh4
        • 2.Rf7#
      • 1...Qg2
        • 2.Rf7#
      • 1...Qb7
        • 2.Bxh7#
      • 1...Qa7
        • 2.Bxh7#
      • 1...Rg2
        • 2.Rf7#
      • 1...Ra7
        • 2.Bxh7#
      • 1...Sb6
        • 2.Rf7#
      • 1...Sa7
        • 2.Rf7#
      • 1...Se7
        • 2.Rf7#
      • 1...Sd6!
  • Keys
    • 1.Sed7!
      • threat
        • 2.Rg5#
      • 1...Qg2
        • 2.Se4#
      • 1...Rg2
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(i);SBLOCK::R1(K)
  • Tries
    • Try
      • S(F);
      • Threat
        • R1(K)
      • Vars
        • Q(g);N_GUARD::R(E)+S(G)
        • R(b);S_CUTB(a)::R(E)+S(G)
      • Refutation
        • R(c);XP(A)
    • Try
      • B(J);XS(i)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XB(D)::R(K)
        • Q(g);::R(K)
        • Q(g);::B(J),XP(f)
        • R(b);::R(K)
        • R(c);::B(J),XP(f)
        • S(h);P_PINB(J)::R(K)
      • Refutation
        • S(h);P_PINB(J)
  • Actual
    • S(G);
    • Threat
      • R1(K)
    • Vars
      • Q(g);N_GUARD::R(E)+S(F)
      • R(b);S_CUTB(a)::R(E)+S(F)
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