MESON Chess Problem Database

Problem Display
PID: 276111 (8/8/8/2Kn1RR1/3NkP2/3pp3/4p1n1/Q7 w - - 0 1)

Gelpernas, Boris

Leun, A

Mat, 1981

8/8/8/2Kn1RR1/3NkP2/3pp3/4p1n1/Q7

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sgxf4
      • 2.Re5#
    • 1...Sdxf4
      • 2.Re5#
    • 1...d2
      • 2.Qb1#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Qxg2#
      • 1...Sxf4
        • 2.Re5#
      • 1...d2
        • 2.Qb1#
      • 1...e1S!
    • 1.Qa2?
      • threat
        • 2.Qxd5#
      • 1...Sgxf4
        • 2.Re5#
      • 1...Sdxf4
        • 2.Re5#
      • 1...d2
        • 2.Qb1#
        • 2.Qc2#
      • 1...Sc3
        • 2.Qe6#
      • 1...Sb4
        • 2.Qe6#
      • 1...Sb6
        • 2.Qe6#
      • 1...Sf6
        • 2.Qe6#
      • 1...Se7
        • 2.Qe6#
      • 1...Sc7!
    • 1.Qa8?
      • threat
        • 2.Qxd5#
      • 1...Sxf4
        • 2.Re5#
      • 1...d2!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Re5#
      • 1...Sgxf4
        • 2.Qh1#
      • 1...Sdxf4
        • 2.Qa8#
      • 1...d2
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(b);SBLOCK,XP(C)::R1(E)
    • S(f);SBLOCK,XP(C)::R1(E)
    • P(c);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);P_PINS(b)
      • Threat
        • QAB(A),XS(b)
      • Vars
        • S(f);SBLOCK,XP(C)::R1(E)
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XS(f)
      • Vars
        • S(b);SBLOCK,XP(C)::R1(E)
        • S(f);SBLOCK,XP(C)::R1(E)
        • S(f);OGATE::QAR2(A)
      • Refutation
        • S(f);
    • Try
      • Q(A);P_PINS(f)
      • Threat
        • QAB1(A),XS(f)
      • Vars
        • S(b);SBLOCK,XP(C)::R1(E)
      • Refutation
        • P(c);
  • Actual
    • R(F);
    • Threat
      • R1(E)
    • Vars
      • S(b);OGATEB,P_SPINS(b),XP(C)::QAB(A)
      • S(f);OGATEB,P_SPINS(f),XP(C)::QAB(A)
      • P(c);OGATEB::QAB(A)
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